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Comparative study on the accuracy of implant-borne single restoration by two production processes with Ti-base CAO Wei-yu, CAO Jie, LIU Bin-yi, XU Zhou, LU Wei-qing Shanghai Journal of Stomatology    2022, 31 (4): 414-417.   DOI: 10.19439/j.sjos.2022.04.015 Abstract （966）      PDF （606KB）（355）       Knowledge map    PURPOSE: To study on the accuracy of implant-borne single restoration by two production processes with Ti-base to provide experimental data for proper processes of single implant-borne restoration. METHODS: Thirty patients were selected with single posterior teeth missing from the Department of Oral Implantology of Shanghai Putuo District Eye Disease and Dental Disease Prevention and Treatment Institute. The patients were taken 2 traditional impressions clinically for two plaster model equipped with implant analogue. These models were then divided into 2 groups according to different production processes. The experimental group was scanned with the scan body installed in the model implant analogue, while the control group was scanned directly on the Ti-base abutment installed in the model implant analogue. The implant-borne single restorations of the two groups were cut along the buccal-lingual side and the distance between the measuring point to the Ti-Base abutment was observed by electron microscopy. In addition, the breaking limit of zirconia crown was observed, universal test machine was used to load direct force to the crown. SPSS 22.0 software package was used for data analysis. RESULTS: The gap between the implant-borne single restoration to the Ti-base abutment of the experimental group was significantly smaller than that of the control group. The difference between the two groups was statistically significant (P<0.05). However, by testing the breaking limit of zirconia crown, there was no significant difference(P>0.05). CONCLUSIONS: Using scan body to transfer the implant position and Ti-base abutment data information to the digital dental design software is more accurate and reliable than directly scanning the Ti-base on the model analogue. Using scan body is recommended for processing and manufacture of implant-borne singe restoration. Reference | Related Articles | Metrics

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Effect of zoledronic acid on mandibular socket healing process of mice at an early stage JIANG Run-yang, KANG Fei-wu Shanghai Journal of Stomatology    2022, 31 (4): 349-353.   DOI: 10.19439/j.sjos.2022.04.003 Abstract （865）      PDF （3074KB）（269）       Knowledge map    PURPOSE: To investigate how bisphosphonates affect early process of socket healing in mice model. METHODS: Eighteen 8-9 weeks C57BL/6 male mice were randomly divided into control and experimental group. Bisphosphonate-related osteonecrosis of the jaw（BRONJ）model was conducted by intraperitoneal injection of zoledronate（ZOL） and extraction of lower left first molar in mice. Three, five, seven day after surgery, the mice were sacrificed and paraffin-embedded slides were made. H-E staining was used to evaluate the gross condition. The distribution and amounts of osteoclasts were measured by TRAP staining. Finally, immunochemical staining was used to detect RUNX2 and CTSK level. All experiments were duplicated thrice, ImageJ was used for transformation of pictures and SPSS 20.0 software package was used for statistical analysis. RESULTS: In comparison with the control group, early process of socket healing in the experimental group was generally delayed. RUNX2,CTSK,TRAP expression level was decreased. On the whole, early bone remodeling process in ZOL injection group was suppressed. CONCLUSIONS: Zoledronic acid inhibited the migration of fibroblasts into socket, and reduced the expression of Runx2, hindering new bone formation. It also can reduce the expression of TRAP 3,5,7 days after tooth extraction and CTSK expression three days after operation, thus inhibiting the bone resorption function of osteoclasts. Reference | Related Articles | Metrics

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Imaging characteristic of Stafne bone cavity：a retrospective study based on cone-beam CT HUANG Jin-cheng, ZHAO Hua-qiang, LI Guo-ju Shanghai Journal of Stomatology    2022, 31 (4): 439-444.   DOI: 10.19439/j.sjos.2022.04.020 Abstract （741）      PDF （1500KB）（384）       Knowledge map    PURPOSE: To guide clinical decision-making more efficiently via collecting and analyzing the imaging data of patients with Stafne bone cavity(SBC). METHODS: Six patients with SBC were retrospectively reviewed in Stomatological Hospital of Shandong University. By assessing cone-beam CT (CBCT) data, age, sex, complaint, cavity location, diameter at three dimension, maximal cross-sectional area of multi-planar reconstruction planes, content gray scale, morphological classification and its relationship with mandibular canal were recorded respectively. RESULTS: A total of 6 cases were inadvertently found on CBCT, with no symptoms. The locations of SBC were between mandibular molar region and mandibular angle, inferior border of mandible and mandibular canal, mostly at lingual side. Three were on the left and three were on the right. The bone cavity was elliptic and its long axis was consistent with the long axis of the mandible, with an average long axis diameter of (16.43±4.54) mm, horizontal axis diameter of (6.91±1.48) mm, vertical axis diameter of (10.24±2.10) mm. According to the multi-planar reconstruction planes readings, the maximal cross-sectional area of the bone cavity was (91.93±25.52) mm2, the maximal coronal area was (57.26±23.23) mm2, and the maximal sagittal area was (127.80±51.22) mm2. In view of the classification in the relationship between SBC marginal line and buccal cortical bone, there were 2 cases of type I cavity, 3 cases of type II cavity and 1 case of type III cavity. The connection between the bone cavity and the surrounding anatomical structure was classified into 3 conditions: covering penetration, adjacency and separation on the basis of the relative position between the cavity boundary with the mandibular inferior margin and the mandibular canal in sagittal plane. In addition, the content type could be primarily identified depending on estimation of corrected grey scale in the center of bone cavity. CONCLUSIONS: CBCT can make an intuitive and clear diagnosis of Stafne bone cavity, which brings great significance into the early clinical decision-making, thus not only avoiding unnecessary surgery, reducing the waste of additional medical resources, but also decreasing the physical and mental trauma of patients. Reference | Related Articles | Metrics

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Effect of three mixing methods on air bubbles and solidification state of alginate impression materials ZHOU Yi-an, XIAO Song, XIE Xue-mei, WANG Yu-hua Shanghai Journal of Stomatology    2023, 32 (1): 12-16.   DOI: 10.19439/j.sjos.2023.01.003 Abstract （673）      PDF （658KB）（233）       Knowledge map    PURPOSE: To evaluate the effect of full-automatic mixing machine method, clockwise manual mixing and combined eight-shaped manual mixing on air bubble content, flowability, temperature, working time and setting time of alginate impression materials. METHODS: With the same condition, alginate impression materials were mixed by three different methods. The number of bubbles, area, flowability, temperature, working time and setting time were evaluated with SPSS 24.0 software package. RESULTS: The number of bubbles in the automatic mixing group was (2.30±2.50), and the area was (0.17±0.18) mm2, which was less than the number of clockwise manual mixing group (59.60±14.19), and the total area (7.41±2.24) mm2 (P<0.01). The flowability of the clockwise manual mixing group [(39.52±0.85) mm] was less than that of the full-automatic mixing group [(50.78±0.90) mm] and the combined eight-character manual mixing group [(50.36±1.75) mm](P<0.01).The setting time of the material mixed by three methods was eligible for clinical use. CONCLUSIONS: The mixing method of alginate impression material has an effect on material's bubble content, flowability and temperature changes. The impression materials mixed by full-automatic mixing method are better in terms of bubble content, flowability and other properties. If manual mixing is used, combined eight-shaped manual mixing method can help reduce impression bubbles and deformation, and improve flowability. Reference | Related Articles | Metrics

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Short-term efficacy of three root canal filling methods in endodontic treatment of chronic periapical inflammation GUO Jing-jing, TANG Yi-qun, HE Hong, XU Zhen Shanghai Journal of Stomatology    2022, 31 (5): 544-549.   DOI: 10.19439/j.sjos.2022.05.018 Abstract （528）      PDF （684KB）（447）       Knowledge map    PURPOSE: To provide a reference basis for clinical selection of a reasonable and effective root canal treatment by comparing the short-term clinical efficacy of three root canal filling methods in the treatment of chronic periapical inflammation. METHODS: One hundred and twenty patients with chronic periapical inflammation who received root canal filling between October 2019 and October 2020 were randomly divided into 3 groups, with 40 patients in each group. All patients received root canal filling, group A was filled with iRoot SP paste by matched-taper single cone obturation technique, group B was filled with AH-plus paste by warm vertical condensation, and group C filled with AH-plus paste by cold lateral condensation. Root canal filling time in the three groups was calculated, pain score 24 h after treatment was determined using visual analogue scale/score(VAS), and periapical index(PAI) was used to evaluate radiographs. SPSS 22.0 statistical software was applied for data analysis. RESULTS： Root canal filling times in the three groups were (75.50±7.44) s in group A, (85.38±3.46) s in group B and (102.33±3.32) s in group C, the differences were statistically significant (P<0.05); the incidence of postoperative pain in the three groups was 25% in group A, 25% in group B and 32.5% in group C, the difference was not statistically significant(P>0.05). There was no significant difference between group A and group B, but significant difference existed between group A, group B and group C. The results of comparison of PAI scores showed a time effect was F=498.93, P<0.001, suggesting significant difference in total PAI scores at different time points; a group effect was F=0.91, P=0.406, suggesting no significant difference in total PAI scores of the 3 groups; an interaction effect of time and group was F=0.44, P=0.777, suggesting that there was no significant difference in total PAI scores of the 3 groups at the time points. The total effective rate at 3 and 12 months was 97.5%, 97.3% in group A, 97.5%, 97.2% in group B and 90%, 91.9% in group C, the difference was not statistically significant(P>0.05). CONCLUSIONS: Compared with the other 2 root canal filling methods, the iROOT SP paste matched-taper single cone obturation technique is clinically effective in terms of time saving and increasing the comfort of the patients' visit. Reference | Related Articles | Metrics

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Segmentation, accuracy validation of mandibular molar, pulp cavity on cone-beam CT images by U-net neural network LIN Xiang, FU Yu-jie, REN Gen-qiang, WEN Jia-huan, CHEN Yu-fei, ZHANG Qi Shanghai Journal of Stomatology    2022, 31 (5): 454-459.   DOI: 10.19439/j.sjos.2022.05.002 Abstract （511）      PDF （912KB）（483）       Knowledge map    PURPOSE: To realize the automatic segmentation of mandibular molar and pulp cavity on cone-beam CT (CBCT) images by U-net convolutional neural network, and to use the 3D models reconstructed by Micro-CT data as the ground truth to validate its accuracy. METHODS: Twenty groups of small field of view(FOV) CBCT data containing complete mandibular molars were collected from the Department of Radiology, Affiliated Stomatology Hospital of Tongji University. After preprocessing, an endodontic specialist labeled teeth and pulp cavities by MITK Workbench software. These data were used as the training set for training U-net neural network. In addition, five mandibular molars and corresponding small FOV CBCT data were collected. These five CBCT were processed in the same way and used as the testing set. Then, teeth and pulp cavities on CBCT images of the testing set were segmented and reconstructed by U-net neural network and the same specialist. The isolated teeth were scanned by a Micro-CT machine after preprocessing and the results were reconstructed to 3D models, which were used as the ground truth. Then the 3D models reconstructed by the specialist’s labeling, U-net network segmentation results, and the ground truth in the testing set were compared. Dice similarity coefficient(DSC), average symmetric surface distance (ASSD), Hausdorff distance (HD), and morphological analysis were used to evaluate the results. SPSS 20.0 software package was used for statistical analysis. RESULTS: Compared with the ground truth, the segmentation accuracy of the U-net neural network measured by DSC, ASSD, and AHD was (95.30±1.01)%, (0.11±0.02) mm, and (1.05±0.31) mm in teeth and (81.21±2.27)%, (0.15±0.05) mm, and (3.29±1.85) mm in the pulp cavity, respectively. Morphological analysis results showed that the U-net network segmentation results were similar to the ground truth in tooth and pulp chamber. As for the segmentation results of root canals, only thick root canals could be segmented rather than the thin root canals, such as the canals in the apical third and lateral root canals. CONCLUSIONS: Under the experimental conditions, the U-net neural network trained by the specialist’s labeling realized the automatic and accurate segmentation of mandibular molar and their pulp chamber on CBCT images. For the segmentation of root canals, the results need to be further improved. Reference | Related Articles | Metrics

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Study of the mandibular changes after treatment of Class Ⅱ division 2 malocclusion in adolescents ZHOU Ming-zhi, WANG Lin, WANG Liang, WU Ke, QIN Yan-jun, ZHAO Chun-yang Shanghai Journal of Stomatology    2022, 31 (4): 389-394.   DOI: 10.19439/j.sjos.2022.04.010 Abstract （510）      PDF （886KB）（343）       Knowledge map    PURPOSE: To evaluate the mandibular and dentoalveolar changes in Class Ⅱ division 2 malocclusion adolescents after treatment. METHODS: Thirty-six patients treated in our hospital were selected. Twelve skeletal Class Ⅱ division 2 adolescents were served as the experimental group, while 12 skeletal Class Ⅱ division 2 adults were selected as the control group 1, 12 skeletal Class Ⅰ adolescents were selected from those who have undergone fixed orthodontic treatment as the control group 2. Cone-beam CT (CBCT) was taken before and after treatment. The lateral cephalometric radiographs generated from CBCT data were committed to explore the changes of the mandible and dentoalveolar bone before and after orthodontic treatment among three groups. Statistic analysis was completed by SPSS 21.0 software package. RESULTS: After orthodontic treatment, the mandibular length (Go-Gn), mandibular ramus height (Co-Go), mandibular protrusion (SNB), mandibular dentoalveolus protrusion (SNId), lower facial height (S-Go, ANS-Me, ANS-Me/N-Me) increased and the fossa of chin decreased significantly in Class Ⅱ division 2 adolescents (P<0.05). The differences of SNB, SNId, ANS-Me/N-Me between Class Ⅱ division 2 and Class Ⅰ adolescents decreased. CONCLUSIONS: The growth potential of the mandible is released after treatment of Class Ⅱ division 2 malocclusion adolescents, promoting mandibular growth and reconstruction. Reference | Related Articles | Metrics

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Applied anatomy of the stylomastoid foramina and its relation to the surrounding bone structures QIN Si-jia, LIU Huan-qi, ZHANG Yu-qing, WANG Dan-yang, HUANG Shuo, WANG Feng, LIU Chang-kui Shanghai Journal of Stomatology    2023, 32 (6): 568-571.   DOI: 10.19439/j.sjos.2023.06.002 Abstract （498）      PDF （607KB）（174）       Knowledge map    PURPOSE: To study the relationship between the stylomastoid foramen and surrounding bony structures, enrich anatomical data and provide reference for clinical surgery. METHODS: A total of 62 intact and dry adult skulls were selected. The shape of the stylomastoid foramen was observed, the diameter of the stylomastoid foramen, the distances from the posterolateral point and the anterior medial point to the surrounding bony structures were measured with a vernier caliper. SPSS 25.0 software package was used to analyze the data. RESULTS: There were four shapes of stylomastoid foramen, i.e., circular (61.29%), oval (29.84%), irregular (8.06%) and triangular (0.81%). The circular diameter was (2.80±0.61) mm, the oval long and short diameters were (4.43±0.96) and (2.79±0.60) mm. Distances from the posterolateral and anterior medial points of the stylomastoid foramen to the posterolateral point of the external opening of the carotid canal, the anterior medial point of the jugular foramen, the midline, the most anterior point of the foramen magnum, the posterior point of the great palatine foramen, the posterolateral point of the foramen lacerated, the foramen ovale, the posterolateral point of the foramen spinosum, the anterior point of the styloid process root, the outermost point of the tympanomastoid fissure and the tip of the mastoid process were (16.10±2.81), (24.01±2.65), (44.95±3.24), (45.10±2.71), (61.66±4.14), (35.56±4.35), (32.26±2.85), (29.12±3.40), (10.39±3.25), (9.49±2.24) and (12.01±2.79) mm; (12.80±2.41), (21.56±2.51), (42.96±3.97), (42.91±2.76), (58.97±3.97), (32.98±4.14), (29.20±2.77), (25.80±2.87), (7.37±2.33), (11.42±2.00) and (15.41±2.57) mm, respectively. Statistical analysis showed that there was no significant difference in the apertures and distances between the left and right side(P>0.05). CONCLUSIONS: Most of the stylomastoid foramen are round and oval, understanding the distance between the foramen and surrounding bony structures is helpful for guiding clinical operations and enriching anatomical knowledge. Reference | Related Articles | Metrics

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A reflectional insight into orthodontic theoretical renovation and technological innovation SHEN Gang Shanghai Journal of Stomatology    2023, 32 (2): 113-119.   DOI: 10.19439/j.sjos.2023.02.001 Abstract （489）      PDF （867KB）（453）       Knowledge map    Orthodontics, among other specialties in dentistry, remains most dynamic and vigorous in upgrading and reforming its fundamental doctrines and clinical technologies. Orthodontic specialty in China has played a leading role in recent years in reshaping fundamental theories and in creating cutting-edge therapeutic modalities. The newly developed diagnostic classification system, a complementary addition to that of Angle's, not only defines the natures, but also identifies the developmental mechanisms of malocclusions. Orthopedic therapy aiming to relocate the mandible before correcting the dentition is emerging as an indispensable treatment mode to malocclusions concurring with mandibular deviation. Whilst correlations exist between malocclusion and TMD susceptibility and incidence, the specifically designed orthopedic and orthodontic approaches have proven effective in managing cases inflicted by TMD conditions. Innovative efforts that create the GS products, have redefined the clear appliances much more beyond merely clear aligners, thus further pushing the boundaries of both the indications and clinical use for clear appliances. Reference | Related Articles | Metrics

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Effect of collagen sponge on the healing process of alveolar fossa after tooth extraction in rats LI Jun-fu, ZHU Jia, JIANG Juan, WANG Xu-xia, CHEN Dai-yun, ZHAO Zuo-qin Shanghai Journal of Stomatology    2023, 32 (3): 241-245.   DOI: 10.19439/j.sjos.2023.03.004 Abstract （484）      PDF （759KB）（278）       Knowledge map    PURPOSE: To investigate the effect of collagen sponge on early bone healing process of alveolar fossa after tooth extraction in rats. METHODS: A total of 16 healthy female SD rats were selected. Animal models with tooth extraction were established. The right alveolar fossa inserted with collagen sponge was as the experimental group, and the left alveolar fossa was as the control group with treatment. The rats were sacrificed 1, 2, 4 and 8 weeks after tooth extraction, and the osteogenesis of alveolar fossa was observed. Real-time quantitative PCR (qt-PCR) was used to detect the changes of osteogenesis related gene expression. SPSS 19.0 software package was used for statistical analysis. RESULTS: After surgery, alveolar cavity healing was significantly better in the experimental group than in the control group. Osterix, Runx2 and Vegf genes were expressed in the experimental group and the control group, and the expression levels of related genes in the experimental group were significantly higher than the control group 1, 2, 4 and 8 weeks after surgery(P<0.05). CONCLUSIONS: Collagen sponge could promote early alveolar bone healing, possibly related to the expression level of osteogenic genes regulated by collagen sponge. Reference | Related Articles | Metrics

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Evaluation of the effect of Er:YAG laser combined with guided bone regeneration in the treatment of peri-implantitis with osseous defects TU Hui-juan, LI Ling-yu, LI Yi-dan, LUO Zhen-lan, YU Ming Shanghai Journal of Stomatology    2022, 31 (4): 418-422.   DOI: 10.19439/j.sjos.2022.04.016 Abstract （467）      PDF （1217KB）（417）       Knowledge map    PURPOSE: To evaluate the clinical benefits of Er:YAG laser combined with guided bone regeneration (GBR) in the treatment of peri-implantitis-assocaited osseous defects. METHODS: Twenty-six patients (34 implants in total) who underwent implant restoration in Dental Disease Prevention and Treatment Institute, Jiading District, from 2017 to 2019 and were diagnosed with peri-implantitis with osseous defects, and randomly divided into the experimental group and control group. The two groups of patients received open flap surgery, debridement and GBR treatment. The only difference in the experimental group was the use of Er: YAG laser to modulate and remove inflammatory tissue as well as to decontaminate the implant surface, instead of traditional mechanical treatment in the control group. The probing depth (PD), bleeding on probing (BOP), and plaque index (PI), the height of the bone defect around the implant (reduce of marginal bone level, RBL) were recorded and compared. SPSS 20.0 software package was used to analyze the data. RESULTS: The PD, BOP, PI and RBL of the two groups of patients were significantly improved after treatment with different methods. There was no significant difference in the improvement of PD, BOP and PI between the two groups 6, 12 and 24 months after treatment, while the improvement of RBL in the experimental group was significantly better than that of the control group 12 and 24 months after treatment. CONCLUSIONS: In the treatment of GBR with peri-implantitis and osseous defects, Er: YAG laser therapy is more effective than traditional mechanical methods, and is more conducive to the regeneration of new bone. Reference | Related Articles | Metrics

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Experimental study of the gap ossification in the double-barrel technique in rabbit tibia WANG Xiao-lin, SU Ming, LI De-long, HAN Zheng-xue Shanghai Journal of Stomatology    2022, 31 (5): 497-500.   DOI: 10.19439/j.sjos.2022.05.009 Abstract （448）      PDF （1099KB）（198）       Knowledge map    PURPOSE: Double-barrel vascularized fibula graft is one of the most common surgical techniques to augment or maintain the height of the neo-mandible. The purpose of this study was to investigate whether the gap completely disappeared and gap ossification ultimately achieved between the double barrels. METHODS: Six rabbits were used in the study. Each animal's tibia was vertically osteotomized at its midpoint, folded onto each other and fixed by mini-titanium plate, thus an animal model of “double barrel” was established. Specimens were obtained at 3 months and 6 months postoperatively, then the gap ossification between the double barrels was evaluated by radiography and histomorphology. Measurements of the gap width between the two tibial struts on X-ray films were performed 3 months after the operation at three sites: distal, middle and proximal site. Measurements were compared with those obtained immediately after operation using SPSS 19.0 software package. RESULTS: Three months after operation, radiography demonstrated that the gap between the double barrels gradually became vague. Histological study showed that irregular new woven bone formed in the gap between the two struts. There was significant difference in mean gap width at the distal and proximal site (P<0.05), but there was no significant difference at the middle site(P=0.552). Radiological and histological study showed cortical bone resorption in the contact area and two thin tubular bones fused into a thicker one 6 months postoperatively. CONCLUSIONS: The double-barrel tibia fixed with titanium microplate can fuse into a large, unique, continuous bone barrel. Reference | Related Articles | Metrics

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Comparative analysis of the effect of autologous dentin particles, implantation of Bio-Oss on guided bone regeneration in the treatment of periodontal bone defects MAO Xin-xia, LIN Xiao-wei, WEI Xuan, LI Qin Shanghai Journal of Stomatology    2022, 31 (5): 530-534.   DOI: 10.19439/j.sjos.2022.05.015 Abstract （446）      PDF （597KB）（398）       Knowledge map    PURPOSE: To analyze the effect of autologous dentin particles and Bio-Oss bone powder implantation on guided bone regeneration in the treatment of periodontal bone defects. METHODS: Eighty-two patients with periodontal bone defect treated in Zhangye People's Hospital from May 2018 to May 2020 who underwent guided bone regeneration treatment were selected and divided into experimental group and control group according to random number table method, with 41 cases in each group. The control group was implanted with Bio-Oss during the operation, and the experimental group was implanted with autologous dentin particles during operation. Periodontal pocket depth and attachment loss, buccal soft tissue profile, buccal soft tissue thickness, red aesthetic score, success rate, and complications were compared between the two groups of patients. SPSS 22.0 software package was used for statistical analysis. RESULTS: Comparison within the group showed that 1 month and 1 year after operation, the periodontal pocket depth and attachment loss of the two groups were significantly reduced(P<0.05); and 1 year after operation, the periodontal pocket depth and attachment loss of the two groups were significantly lower than 1 month after surgery(P<0.05). Comparison between groups showed that 1 month and 1 year after operation, the periodontal pocket depth and attachment loss of the experimental group were significantly lower than those of the control group (P<0.05). Comparison within groups showed that 1 month and 1 year after operation, the buccal soft tissue profile of the two groups were significantly higher than that before operation (P<0.05); and 1 year after operation, the buccal soft tissue profile of the two groups were significantly lower than 1 month after operation. Comparison between groups showed that 1 year after operation, the buccal soft tissue profile of the experimental group was significantly higher than that of the control group (P<0.05). Comparison within groups showed that 1 month and 1 year after surgery, the thickness of the buccal soft tissue of the two groups were significantly higher than that before surgery. Comparison between groups showed that there was no significant difference in the thickness of the buccal soft tissue at each time point between the two groups(P>0.05). Comparison within groups showed that 1 month and 1 year after operation, the red aesthetic scores of patients in the two groups were significantly higher than those before operation (P<0.05); in addition, the red aesthetic scores of the two groups 1 year after surgery were significantly higher than those 1 month after surgery (P<0.05). Comparison between groups showed that 1 month and 1 year after surgery, the red aesthetic scores of the experimental group were significantly higher than those of the control group (P<0.05). One year after operation, the success rate of the experimental group and the control group were 90.24% (37/41) and 85.37% (35/41), respectively, and there was no significant difference between the two groups(P>0.05). There was no significant difference in the incidence of complications between the two groups(P>0.05). CONCLUSIONS: Autologous dentin particles can be used to guide bone regeneration to treat patients with periodontal bone defects, which can reduce the depth of periodontal pockets and loss of attachment, improve the buccal soft tissue profile and red aesthetic score, and the success rate is equivalent to implantation of Bio-Oss. Therefore, it is a safe and reliable treatment method. Reference | Related Articles | Metrics

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Imaging findings of carcinoma ex pleomorphic adenoma in minor salivary glands ZHU Wen-Jing, YU Qiang, TAO Xiao-feng, WANG Shao-ying, TIAN Tao, ZHANG Chun-ye Shanghai Journal of Stomatology    2023, 32 (3): 255-260.   DOI: 10.19439/j.sjos.2023.03.007 Abstract （428）      PDF （1392KB）（230）       Knowledge map    PURPOSE: To summarize the CT and MR imaging features of carcinoma ex pleomorphic adenoma(Ca-ex-PA) in minor salivary gland, and analyze the correlation between various features and pathological classification. METHODS: Forty-three patients with Ca-ex-PA in minor salivary gland were collected. The CT and MRI findings were retrospectively analyzed and correlated with their pathological types. Fisher's exact test was used to analyze the correlation between various imaging features (tumor morphology, boundary, internal structure, bone invasion, cervical lymph node metastasis) and pathological types with SPSS 25.0 software package. RESULTS: Among the 43 patients with Ca-ex-PA, 83.7%(36/43) of the tumors were lobulated; 81.4%(35/43) showed cystic degeneration or necrosis, with heterogeneous enhancement. Coarse calcification or mixed calcification was found in 37.2%(16/43), 25.6%(11/43) had compressive absorption of adjacent bone. 75%(12/16) of type Ⅰ/Ⅱ tumors had regular morphology (round or oval), and 77.8%(21/27) of type Ⅲ tumors had irregular morphology, 93.8%(15/16) of type Ⅰ/Ⅱ tumors had well-defined margin and 66.7%(18/27) of type Ⅲ tumors had ill-defined margin. Osteolytic bone resorption occurred in 59.3%(16/27) of type Ⅲ tumors. The average maximum diameter of type Ⅰ/Ⅱ tumors was significantly shorter than that of type Ⅲ(P<0.05). Fisher's exact test showed the characteristics of tumor morphology, boundary and osteolytic bone resorption were related to pathological grouping(P<0.001). CONCLUSIONS: Most Ca-ex-PA in minor salivary glands is characterized by lobular and heterogeneous enhanced neoplasm on CT and MR imaging. A round or oval tumor with well-defined margin usually correlates with typeⅠ and Ⅱ, contrarily, an irregular mass with ill-defined margin and osteolytic bone destruction usually correlates with type Ⅲ. Combining the three characteristics of morphology, boundary and osteolysis is more helpful to distinguish type Ⅰ/Ⅱ and type Ⅲ tumors. Reference | Related Articles | Metrics

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Effectiveness of adjunctive photodynamic therapy in the treatment of stage Ⅲ, Ⅳ periodontitis FAN Ya-dan, SHU Rong, CHENG Lan, GE Lin-hua Shanghai Journal of Stomatology    2022, 31 (5): 501-506.   DOI: 10.19439/j.sjos.2022.05.010 Abstract （427）      PDF （583KB）（339）       Knowledge map    PURPOSE: To explore the clinical effect of subgingival scaling and root planning (SRP) with adjunctive photodynamic therapy (PDT) in the treatment of stage Ⅲ and Ⅳ periodontitis. METHODS: According to 2018 Classification of Periodontitis, patients diagnosed as stage Ⅲ and Ⅳ periodontitis were recruited. One week after supragingival scaling, probing depth (PD), bleeding on probing (BOP) and gingival index (GI) were recorded as the baseline. All patients were divided into 3 groups, SRP group received whole mouth SRP treatment; PDT1 group: PDT at all sites with PD≥5 mm immediately after SRP; PDT2 group received another PDT at the test sites 6 weeks after full mouth SRP+PDT. PD, GI and the positive rates of BOP were compared 3 months and 6 months after treatment. SPSS 22.0 software package was used for data analysis. RESULTS: Thirty patients and 1 289 test sites were included in this trial. There were 10 patients in group SRP, PDT1 and PDT2, and the number of tests sites were 476, 36.9%, 384, 29.8% and 429 33.3%, respectively. The PD, GI and the positive rates of BOP in the three groups were reduced at 3-months and 6-months of follow-up (P<0.05), there was no significant difference between 3-months and 6-months of follow-up. At the site of PD≥5 mm, group PDT1 and PDT2 could significantly reduce GI and the positive rates of BOP at the test sites(P<0.05). When PD≥7 mm, significant PD reduction was observed in group PDT2(P<0.05). CONCLUSIONS: In the treatment of stage Ⅲ and Ⅳ periodontitis, PDT assisted with SRP therapy can achieve better clinical effect than SRP alone. Reference | Related Articles | Metrics

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Effect evaluation on different treatment methods of the gap of immediate implantation in canine posterior mandible ZHANG Yi-wen, ZOU Duo-hong, ZHANG Zhi-yuan Shanghai Journal of Stomatology    2022, 31 (4): 337-342.   DOI: 10.19439/j.sjos.2022.04.001 Abstract （424）      PDF （2212KB）（370）       Knowledge map    PURPOSE: This study was aimed to explore the formation of new bone after different methods of filling the gap between the extraction socket and the implant in immediate implantation of the canine mandibular molar area. METHODS: Six Labrador dogs aged 1.5-2.0 years were used as the experimental subjects. The fourth premolar and the first molar were extracted from the mandible of each dog, and then 4 dental implants (Astra Tech®, 4.0 mm × 10 mm) were implanted respectively. The mesial and distal gaps between dental implants and the walls of extraction socket were treated in three methods: blank group (group NN), gelatin sponge with colloidal silver (Gelatamp) group (group EN), Gelatamp + absorbable collagen membrane (CM) group (group EG). At 12 weeks, the dogs were euthanized, and specimens were collected for micro-CT scanning and histological analysis. SPSS 25.0 software package was used for statistical analysis. RESULTS: The survival rate at 12 weeks after implantation was 100%. Micro-CT scan results showed no significant differences in new bone height, bone mineral density (BMD), bone volume fraction (BV/TV), bone surface area bone volume ratio (BS/TV), bone trabecular thickness (Tb.Th), bone trabecular number (Tb.N) and bone trabecular separation (Tb.Sp) among different groups. Histological analysis showed no significant differences in the area of new bone formation and bone-implant contact (BIC). CONCLUSIONS: After different treatments are performed on the gap between implants and extraction sockets, Gelatamp alone or in combination with CM has no significant effect on new bone formation, BIC, BMD, BV/TV, BS/TV, Tb.Th, Tb.N and Tb.Sp around implant. Reference | Related Articles | Metrics

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Practice and thinking of promoting ideological and political education in system integrated curriculum of stomatology YU Song, ZHANG Wen-hui Shanghai Journal of Stomatology    2022, 31 (4): 445-448.   DOI: 10.19439/j.sjos.2022.04.021 Abstract （421）      PDF （613KB）（467）       Knowledge map    System integrated curricula are based on organs and systems. They closely combine basic medicine theory with clinical practice, aiming to stimulate students' subjective initiative and improve their ability to analyze and solve problems. In order to implement moral education concept in the teaching process of professional courses for dental students, dental teaching teams of Shanghai Jiao Tong University School of Medicine has carried out teaching reforms including constructing a stronger team of teachers, making ideological and political achievement goals of curriculum, finding out and writing ideological and political materials. Taking advantages of the various teaching forms of integrated curricula, the curriculum ideological and political education is run through the whole process of professional teaching, in order to cultivate dental talents with both ideological and humanistic ability. Reference | Related Articles | Metrics

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Effect of polishing method and time on the fitness of CAD/CAM zirconia ceramic crown ZHAO Chen, BAI Yue-hui, LIU Yang, JIANG Shan-shan, SHANG Qing-long, ZHAO Tian-tian, YUAN Shuo, LI Ning, JIAO Jian-ping Shanghai Journal of Stomatology    2023, 32 (3): 236-240.   DOI: 10.19439/j.sjos.2023.03.003 Abstract （418）      PDF （870KB）（223）       Knowledge map    PURPOSE: To compare the effect of different polishing methods and time treatment on the fitness of CAD/CAM zirconia ceramic crowns. METHODS: Sixteen intact maxillary premolars were randomly divided into two groups, group A was treated with silicon carbide burs, while group B was treated with tungsten steel burs. At different polishing time points of the same tooth, digital impressions of each group were obtained, which were used to manufacture CAD/CAM zirconium ceramic crowns. After trial fitting, the gap impressions were obtained by using silicone rubber replication method, and the marginal and internal discrepancies were assessed. The data were statistically analyzed with SPSS 21.0 software package. RESULTS: The difference between the gap values of the marginal and internal markers of group A and group B was not statistically significant(P>0.05). Compared with the no-polishing process, the differences of the marginal gap (39.67±8.35) μm and internal gap (45.18±7.16) μm of group A polished for 4 min, and the marginal gap (51.25±14.73) μm, and internal gap (48.56±6.45) μm of group B polished for 3 min, as well as the marginal gap (48.87±8.90) μm, and internal gap (45.99±7.12) μm of group B polished for 4 min, were all significant(P<0.05). CONCLUSIONS: CAD/CAM zirconia ceramic crowns treated with silicon carbide bur for polishing 4 min and tungsten steel for 3 min has the best fitness. Reference | Related Articles | Metrics

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Short-term comparison of the clinical efficacy of angulated screw-retained implant crowns and cemented implant crowns in esthetics region LYU Xiao-lei, SHI Jun-yu, QIAN Shu-jiao, LAI Hong-chang Shanghai Journal of Stomatology    2022, 31 (4): 423-428.   DOI: 10.19439/j.sjos.2022.04.017 Abstract （417）      PDF （865KB）（416）       Knowledge map    PURPOSE: To compare the clinical efficacy of angulated screw channel abutments and prefabricated titanium abutments on the restoration of single implant crowns in esthetics region. METHODS: The study was a prospective, single center, randomized controlled trial. Patients with the need of restoration of single tooth in esthetics region were included from June 2018 to June 2019. Forty patients were randomly assigned into two groups: screw-retained crowns with angulated screw channel abutments(angulated group, AG) and cemented crowns with prefabricated Ti abutments (cemented group, CG). Clinical and radiological evaluations were performed on the day of final crowns delivery and 6 months later. Implant survival rate, marginal bone loss (MBL), mechanical complications, peri-implant conditions (Probing depth, PD; bleeding on probing, BOP%), pink esthetics score/white esthetics score(PES/WES) and patients' satisfaction were assessed. The data was analyzed with SPSS 19.0 software package. RESULTS: Thirty-six patients (AG: 19, CG: 17) attended the 6-month clinical trial. Implant survival rates were both 100% in two groups. The MBL was (0.21±0.18) mm for AG and (0.38±0.40) mm for CG (P>0.05). The BOP% was significantly higher in AG than that in CG (P=0.04). No significant difference of mechanical complications, PD, PES/WES and patients’ satisfaction was found between the two groups(P>0.05). CONCLUSIONS: Based on the present results, both treatment options show acceptable clinical outcomes in the short term. Angulated screw-retained crowns may benefit the peri-implant soft tissue; however, studies with long-term follow-up are needed to verify the results. Reference | Related Articles | Metrics

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Review of clinical effects of disk-up sinus reamer(DSR)-based internal sinus floor elevation with implantation in 10 years ZHANG Kai-yue, HAN Ze-yu, JIANG Shuai, XU Hao, LI Fan, ZHAO Bao-dong Shanghai Journal of Stomatology    2024, 33 (1): 64-70.   DOI: 10.19439/j.sjos.2024.01.011 Abstract （413）      PDF （1101KB）（238）       Knowledge map    PURPOSE: To analyze the bone remodeling around the implant 10 years after disk-up sinus reamer(DSR)-based internal sinus floor elevation with implantation and to investigate the influence of different factors on implant retention. METHODS: The clinical and imaging data of patients undergoing DSR-based sinus floor elevation with simultaneous implantation were collected from the Department of Dental Implantology, Affiliated Hospital of Qingdao University from January 2008 to December 2011. Panoramic film and CBCT were used to measure the changes of bone mass around implant in different periods. Kaplan-Meier and Log-rank tests were used to analyze the effects of different factors on implant retention with SPSS 26.0 software package. RESULTS: The study included 98 patients with a total of 128 implants. During the follow-up of 0-168 months, 7 implants failed, and the remaining formed good osseointegration and functioned, with a 10-year cumulative retention rate of 94.53%. The height of bone formation was (0.29±0.15) mm at the top and (2.74±0.66) mm in the sinus of 75 implant sites with complete imaging data obtained ten years after surgery. Kaplan-Meier and Log-rank tests showed that 8 factors including initial bone height, elevated bone height, mucosal perforation, implant length, implant torsion, diabetes, smoking and periodontitis had significant effects on implant retention. CONCLUSIONS: The DSR-based internal sinus floor elevation with implantation is a reliable and stable bone augmentation operation for vertical bone defect in maxillary posterior region, with a 10-year cumulative retention rate of no less than 94%. Initial bone height, elevated bone height, mucosal perforation, implant length, implant torsion, diabetes, smoking and periodontitis are the important factors affecting the long-term retention rate of implants. Reference | Related Articles | Metrics