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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 （530）      PDF （658KB）（179）       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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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 （342）      PDF （759KB）（169）       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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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 （329）      PDF （870KB）（174）       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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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 （303）      PDF （1392KB）（173）       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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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 （292）      PDF （1101KB）（136）       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

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Expression level and clinical significance of CD44 and CD33 in 77 patients with benign lymphoadenosis of oral mucosa WANG Xun-xia, JIANG Guo-ping, ZHANG Yong-zhe, LI Ai-qun, WANG Rui-chun Shanghai Journal of Stomatology    2023, 32 (1): 80-84.   DOI: 10.19439/j.sjos.2023.01.015 Abstract （290）      PDF （574KB）（78）       Knowledge map    PURPOSE: To investigate the expression and clinical significance of CD44 and CD33 in benign lymphoadenosis of oral mucosa(BLOM). METHODS: From January 2017 to March 2020, seventy-seven BLOM wax blocks from the Department of Pathology of Qingdao Traditional Chinese Medicine Hospital were selected as the experimental group, and 63 cases of normal oral mucosal tissue wax blocks during the same period were selected as the control group. Immunohistochemical method was used to detect the positive expression of CD44 and CD33 in the two groups.Spearman correlation analysis was used to analyze the correlation between the positive expression of CD33 and the positive expression of CD44 in the diseased tissues of BLOM patients.The general information about patients were collected.The relationship between the expression of CD33 and CD44 in the diseased tissues of BLOM patients and the clinicopathological characteristics of BLOM patients were analyzed. SPSS 21.0 software package was used for statistical analysis of the data. RESULTS: The positive expression rates of CD33 in the control group and the experimental group were 95.24% and 63.64%, respectively, and the difference was statistically significant(P<0.05). The positive expression rates of CD44 in the control group and the experimental group were 93.65% and 67.53%, respectively, and the difference was statistically significant(P<0.05). The results of Spearman correlation analysis showed that the positive expression of CD33 in the diseased tissues of BLOM patients was positively correlated with the positive expression of CD44 (r=0.834, P=0.002). The expression of CD33 and CD44 in the diseased tissues of patients with BLOM were related to clinical type, degree of inflammation, presence or absence of lymphoid follicles, and lymphocyte infiltration(P<0.05), but not related to age, gender, course of disease, location, and epithelial surface keratinization(P>0.05). CONCLUSIONS: The positive expression rate of CD33 and CD44 in the BLOM tissues decreased, which was closely related to the clinical type, degree of inflammation, presence or absence of lymphoid follicles, and lymphocyte infiltration. Reference | Related Articles | Metrics

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Experimental study on the optical properties of different-translucency zirconia-ceramic restorations ZOU Yan, XIONG Pei-wen, ZHU Hong-shui Shanghai Journal of Stomatology    2023, 32 (2): 154-157.   DOI: 10.19439/j.sjos.2023.02.008 Abstract （269）      PDF （524KB）（122）       Knowledge map    PURPOSE: The purpose of this in vitro study was to measure the color difference(△E) on titanium alloy background and translucency parameter(TP) of four kinds of zirconia-based all-ceramic specimens, providing a clinical reference for restoring grayish abutment. METHODS: Four groups with a total of 24 ceramic specimens were fabricated to a final specimen dimension of 14 mm×14 mm×1.5 mm, two kinds of zirconia with different translucency（Beitefu high-translucency, Cercon low-translucency）and their corresponding body porcelain at the shade of A2 were used as followed:high-translucency zirconia sintered dentine porcelain(Group A),low-translucency zirconia sintered dentine porcelain(Group B),high-translucency zirconia sintered opaque and dentine porcelain(Group C),low-translucency zirconia sintered opaque and dentine porcelain(Group D).The color parameters of the specimens under two backgrounds (titanium alloy and shade A3 light-activated resin-based composite) were measured by Shade Eye NCC colorimeter, then the △E value was determined by the relevant equations. The color parameters under black and white background were measured, and TP value was calculated. The experimental data were analyzed with SPSS 17.0 software package. RESULTS: There was significant difference of the TP value and the △E value among four groups specimens(P<0.05), the TP value was arranged as follows: group D<group C<group B<group A. The specimen used with opaque porcelain showed significantly reduced translucency. The △E value was arranged as follows :group D < group C < group B < 1.5 < 2 <group A, the △E value of group A cannot be accepted in clinic. CONCLUSIONS: The restoration of low-translucency zirconia sintered translucency veneering ceramic has better translucency, with value of △E<1.5 when used on the grayish abutment, which has a good aesthetic performance. Reference | Related Articles | Metrics

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Relationship between sICAM-1, IL-1β and HIF-1α levels in gingival sulcus fluid and peri-implantitis in patients with implant restoration XIE Xue-mei, ZHANG Jia-yuan, ZHANG Ye, YU Xiao-jia, LIU Li-ming, WANG Jian, YU De-dong Shanghai Journal of Stomatology    2023, 32 (1): 47-51.   DOI: 10.19439/j.sjos.2023.01.009 Abstract （266）      PDF （646KB）（104）       Knowledge map    PURPOSE: To investigate the relationship between the levels of soluble intercellular adhesion molecule-1 (sICAM-1), interleukin-1β (IL-1β) and hypoxia-inducible factor-1α (HIF-1α) in gingival sulcus fluid and peri-implantitis (PI) in patients with implant restoration. METHODS: A total of 198 patients with implant restoration admitted to Fengcheng Hospital from January 2019 to December 2021 were selected, the patients were divided into PI and non-PI group according to whether the implant restoration was complicated by PI 3 months after restoration. The levels of sICAM-1, IL-1β and HIF-1α in the gingival sulcus fluid prior to implant restoration were measured by enzyme-linked immunosorbent assay. Multi-factor logistic regression was used to analyze the factors influencing concurrent PI in patients with implant restoration. ROC curves were used to analyze the predictive value of sICAM-1, IL-1β and HIF-1α levels in gingival sulcus fluid on concurrent PI in patients with implant restoration. SPSS 28.0 software package was used for statistical processing of the data. RESULTS: The incidence of PI in 198 patients with implant restoration was 17.68% (35/198) 3 months after implant restoration. The levels of sICAM-1, IL-1β and HIF-1α in the gingival sulcus fluid were significantly higher in the PI group than in the non-PI group (P<0.05). Multi-factor logistic regression analysis showed that elevated sICAM-1(OR=1.135, 95%CI: 1.066 to 1.208), IL-1β (OR=1.106, 95%CI: 1.054 to 1.161) and HIF-1α (OR=1.008, 95%CI: 1.004 to 1.012) were independent risk factors for complications of PI in prosthetic patients(P<0.05). ROC curve analysis showed that the area under the curve for sICAM-1, IL-1β and HIF-1α levels in gingival sulcus fluid alone and in combination for the diagnosis of concurrent PI in patients with implantation was 0.787, 0.785, 0.794 and 0.930, respectively, with sensitivity of 80.00%, 74.29%, 62.86% and 88.57% and specificity of 66.87%, 74.85%, 78.53% and 85.28%, respectively. CONCLUSIONS: Elevated levels of sICAM-1, IL-1β and HIF-1α in gingival sulcus fluid are independent risk factors for PI complications in patients with implant restoration and can be used as an auxiliary predictor of PI complications in patients with implant restoration. Reference | Related Articles | Metrics

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A case of two-stage orthodontic treatment of skeletal ClassⅡmalocclusion with mandibular retrusion and maxillary dental arch stenosis ZHANG Yun, LI Xiao-bing Shanghai Journal of Stomatology    2023, 32 (5): 555-560.   DOI: 10.19439/j.sjos.2023.05.020 Abstract （266）      PDF （2656KB）（200）       Knowledge map    This article reviewed two-stage orthodontic treatment of a patient with skeletal ClassⅡmalocclusion with mandibular retrusion and maxillary dental arch stenosis. The patient was also accompanied by premature loss of bilateral mandibular deciduous canines and mesialization of mandibular posterior teeth. The first-stage treatment mainly corrected the maxillary dental arch stenosis, maxillary anterior teeth protrusion, mandibular retrusion and skeletal ClassⅡmalocclusion, while the second-stage treatment mainly corrected the mesialization of mandibular posterior teeth and alignment of maxillary and mandibular dentition. The two-stage orthodontic treatment finally enabled the patient to achieve good dental arch shape, tooth alignment, skeletal face pattern and soft tissue profile. Reference | Related Articles | Metrics

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Research for the influencing factors affecting the long-term survival time of implants: a retrospective cohort study YANG Zhi-jie, TANG Ting, LIU Kun, ZHANG Lei, ZHAI Qin-kai Shanghai Journal of Stomatology    2023, 32 (3): 292-297.   DOI: 10.19439/j.sjos.2023.03.014 Abstract （262）      PDF （680KB）（142）       Knowledge map    PURPOSE: To investigate the timing of implant failure events and their relationship with the dental position and the factors affecting the survival time of implants. METHODS: A retrospective cohort study was conducted to analyze the patients who had implants removed due to implant failure in the Department of Dental Implantology of Hefei Stomatological Hospital from January 2019 to December 2021. The predictor variables were surgical age, gender, smoking habit, oral hygiene, glucose value, jaw and dental position, implant type, implant number, surgeon, implant placement timing, implant loading timing, and antibiotic use timing. The outcome measurement was the implant survival time and implant failure events. Chi-square test, Kaplan-Meier(Log-rank test), and Cox proportional hazards model were used to identify and stepwise determined potential risk factors for implant survival time with SPSS 21.0 software package. RESULTS: A total of 89 patients(95 implants) had to remove implants. The mean survival time of the failed implants was 31(95%CI :24.2-39.1) months. Implant number (P=0.038), implant loading timing (P=0.050), and tooth position (P=0.024) were significantly correlated with the implant survival time. The risk of failure with 2 implants was 2.709 (HR=3.709, 95%CI: 1.075-12.795) times higher than that with 1 implant, and the risk of failure with late implant loading was 0.551(HR=1.511, 95%CI: 0.999-2.406) times higher than that with early implant loading. The risk of anterior teeth implant failure was 1.384 times higher than that of molars(HR=2.384, 95%CI:1.327-4.283). For patients with implant failure, about 50% of the patients removed the failed implant within 1 year after surgery, and the rate of removal of the failed implant gradually slowed down in the following 2-10 years. Peri-implantitis most commonly occurred in molars(50%). Implant fracture lastly occurred at 55(95%CI: 42.2-67.9) months postoperatively（P=0.000）. CONCLUSIONS: The number of implants, implant loading timing, and dental position were considered as the influencing factors for the survival time of implants. Follow-up in the first year after implantation seems to be particularly important for timely detection of problems and timely intervention. The occurrence of implant failure events was related to dental position and time. Reference | Related Articles | Metrics

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Oral dexketoprofen tromethamine for preemptive analgesia in extraction of impacted teeth: a randomized controlled double-blind trial ZHAO Jun, WU Xiao-bo, LIU Na, ZHOU Yu, HAO Xin-he Shanghai Journal of Stomatology    2023, 32 (3): 298-301.   DOI: 10.19439/j.sjos.2023.03.015 Abstract （262）      PDF （528KB）（145）       Knowledge map    PURPOSE: To study the preemptive analgesic effect of dexketoprofen tromethamine in extraction of impacted teeth. METHODS: Twenty patients with bilateral mandibular impacted teeth were selected, and were randomly divided into dexketoprofen tromethamine group(experimental group) and placebo group(control group). The pain scores of patients at 0.5, 2, 4, 8, 12, and 24 hours after tooth extraction were counted by numeric rating scale(NRS), and the total dosage of emergent analgesic drugs used in 24 hours was recorded. COX analysis method was used to compare the interval time and the number of cases of first application of emergent analgesic drugs after two operations, and the survival curve was drawn. SPSS 20.0 software package was used for data analysis. RESULTS: The NRS scores of postoperative pain in the experimental group were significantly lower than those in the control group at 2, 4, 8 and 12 hours after operation (P<0.05). The dose of emergent analgesics used in the experimental group for 24 h was significantly lower than that in the control group (P<0.05). Survival curve showed that the interval time between the first application of analgesics in the experimental group was significantly longer than that in the control group(P<0.05). CONCLUSIONS: Dexketoprofen tromethamine can achieve obvious analgesic effect within 12 hours, but the analgesic effect is not obvious after 12 hours. Reference | Related Articles | Metrics

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In vitro study on cytotoxicity, osteogenic potential and antibacterial activity of silicate root canal sealers YANG Xi-liang, ZHENG Tian-xia, LI Wen, WANG Wu-liang, YIN Zi-han, BAI Yu-hong Shanghai Journal of Stomatology    2023, 32 (3): 246-250.   DOI: 10.19439/j.sjos.2023.03.005 Abstract （255）      PDF （1442KB）（152）       Knowledge map    PURPOSE: To evaluate the in vitro biocompatibility and antibacterial activity of a new type of strontium silicate-based C-Root SP root canal sealer, and to provide a reference for clinical selection of sealers. METHODS: C-Root SP, iRoot SP and AH Plus extracts were prepared, L929 cells and MC3T3-E1 cells were cultured in vitro, and the cytotoxicity and osteogenic potential of the three sealers were compared. Fresh sealers were mixed with Enterococcus faecalis solution and the antibacterial activity of the sealer was determined by direct contact text (DCT). SPSS 25.0 software package was used for statistical analysis. RESULTS: At 24, 48, and 72 h, the cytotoxicity of the sealers in each group were significantly different (P<0.01). Compared with AH Plus, the cytotoxicity of C-Root SP was lower (P<0.01). C-Root SP was superior to AH Plus in promoting the activity of alkaline phosphatase(ALP) (P<0.01). iRoot SP was the strongest in promoting the formation of mineralized nodules, followed by C-Root SP, and the weakest was AH Plus(P<0.01). C-Root SP inhibited the growth of Enterococcus faecalis, and its antibacterial rate was significantly higher than AH Plus(P<0.01). CONCLUSIONS: The strontium silicate root canal sealer C-Root SP has low cytotoxicity, certain osteogenic potential and antibacterial activity against Enterococcus faecalis, so it can be used for root canal filling. Reference | Related Articles | Metrics

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An improved paraffin embedding method for small core needle biopsy: technical introduction and evaluation CHEN Wan-ling, SHI Chao-ji, WANG Min, GU Ting, TIAN Zhen Shanghai Journal of Stomatology    2023, 32 (1): 6-11.   DOI: 10.19439/j.sjos.2023.01.002 Abstract （254）      PDF （2236KB）（130）       Knowledge map    PURPOSE: Modified agar pre-embedded paraffin embedding method was proposed to evaluate the effects on tissue integrity, histological morphology, protein and DNA detection in small specimens of core needle biopsies. METHODS: The core needle biopsy specimens of 10 patients with oral mucosal squamous cell carcinoma were subjected to modified agar pre-embedded paraffin embedding using molded embedding molds and conventional paraffin embedding respectively, the dehydration time of the former was 3.5 h and that of the latter was 12 h. After tissue treatment, H-E staining, histological morphology, immunohistochemistry (IHC), and DNA fluorescence in situ hybridization (FISH) were performed, respectively. The results were compared and analyzed using GraphPad Prism 9 software package. RESULTS: The modified agar pre-embedding method was less difficult to perform than the agar pre-embedding method, and easier to be promoted. Compared with conventional paraffin embedding method, the tissue dehydration time was significantly reduced(P<0.001), and the results of microscopic histological morphology and subsequent IHC and FISH assays were reliable. CONCLUSIONS: The modified agar pre-embedded paraffin embedding method meets the requirements of clinical pathological diagnosis for tissue processing, and is worthy of clinical application for core needle biopsy specimens. Reference | Related Articles | Metrics

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Application of 3D printing modified tooth-supported cyst plug in decompression of mandibular cystic lesions KOU Peng, LI Ying-mei, LI Zhi-ping, MENG Jian Shanghai Journal of Stomatology    2023, 32 (2): 203-208.   DOI: 10.19439/j.sjos.2023.02.017 Abstract （253）      PDF （1849KB）（182）       Knowledge map    PURPOSE: To evaluate the application value of 3D printing modified dental support cyst plug in fenestration of large jaw cystic lesions. METHODS: Forty patients with mandibular cystic disease in Xuzhou Central Hospital from October 2019 to April 2021 were selected. They were randomly divided into experimental group(3D printing group) and control group (traditional plug group), with 20 cases in each group. All enrolled patients underwent preoperative digital modeling of cystic lesions of the jaw, obtained the cystic cavity volume data of preoperative lesions, designed the windowing site according to the plan and performed decompression for jaw cysts. Three days after surgery, the patient's postoperative CBCT and Oral-scan data in the experimental group was obtained, and a digitally modified tooth-supported cyst plug with porous column channel was designed, and titanium alloy material for 3D printing was selected. In the control group, the plug was manually molded by experienced physicians. The visual analogue scale(VAS) score of pain, retention, mechanical properties of the plug and its effect on the adjacent teeth were compared between the two groups during the process of model preparation, and the changes of the cyst volume 1, 3 and 6 months after operation were compared between the two groups. SPSS 25.0 software package was used for data analysis. RESULTS: Compared with the control group, the patients in the experimental group who made titanium alloy as printing material by digital impression complained more comfortable, and the mechanical strength and stability of the cyst plug were better than those in the control group(P< 0.05). There was no significant difference in retention between the two groups(P>0.05). The reduction rate of cyst volume in the experimental group was significantly higher than that in the traditional plug group 3 and 6 months after operation(P<0.05). CONCLUSIONS: The modified tooth-supported titanium alloy cyst plug with digital 3D printing has good mechanical properties and stability. It has little damage to the abutment and no lateral force, and has the advantages of precision, individualization and comfort. The improved irrigation and injection channel can fully flush the cavity and speed up the narrowing of the cyst and reduce the waiting time before the second operation, which is worth promoting in clinical practice. Reference | Related Articles | Metrics

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The clinical value of multislice CT for measuring the anatomical position of the mandibular nerve canal TAN Zhi, SHEN Li, YANG Jing, LIU Ping Shanghai Journal of Stomatology    2023, 32 (3): 314-317.   DOI: 10.19439/j.sjos.2023.03.018 Abstract （249）      PDF （456KB）（119）       Knowledge map    PURPOSE: To investigate the clinical value of multislice CT(MSCT) for measuring the anatomical position of the mandibular nerve canal during implantation in the posterior mandibular regions. METHODS: A total of 109 patients with mandibular posterior dental implants were included,and the linear distance between the alveolar ridge and the mandibular nerve canal in the posterior mandibular region to be implanted was measured by MSCT and CBCT before implantation. All 109 patients were divided into the MSCT navigation group and CBCT navigation group, and the imaging data from both groups were imported into the dynamic real-time navigation system for implant design, in parallel and in real time. The patients in both groups underwent MSCT or CBCT to measure the deviation of the actual position of the implant from the preoperative design position, including the deviation of the cervical centrum and apical part of the implant and the deviation of the distance between the implant and the mandibular nerve canal, and to assess their clinical results after treatment. The data were statistically analyzed with SPSS 21.0 software package. RESULTS: The deviations from the linear spacing between the top of the alveolar ridge and the upper arm of the mandibular nerve canal of the different dental implants in the area to be implanted were detected by MSCT as well as CBCT methods with no significant difference. In addition, there was no significant difference in the cervical deviation, tip deviation, depth deviation, angular deviation and deviation of the spacing between the implant and the mandibular nerve canal in the postoperative implant position in MSCT navigation group compared to the preoperative implant design position in CBCT navigation group. There was also no significant difference in the incidence of functional impairment of the inferior alveolar nerve between CBCT-guided and MSCT-guided group of patients. CONCLUSIONS: MSCT can achieve precise localization of the anatomical structures of the mandibular nerve canal, and the operation according to MSCT navigation during dynamic real-time guided dental implant surgery can avoid damage to the inferior alveolar nerve. Reference | Related Articles | Metrics

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Analysis of reasons and countermeasures for cancellation of oral and maxillofacial day surgery LI Yan, XU Ying, YANG Yue-lai, JI Jun, SHI Tian Shanghai Journal of Stomatology    2023, 32 (3): 328-331.   DOI: 10.19439/j.sjos.2023.03.021 Abstract （249）      PDF （801KB）（138）       Knowledge map    PURPOSE: To analyze the reasons for cancellation of oral and maxillofacial day surgery on the same day, and to propose countermeasures, so as to provide reference for improving the work efficiency and medical quality of day surgery ward. METHODS: The number of oral and maxillofacial day surgery cancellation cases in Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine from June 1, 2021, to December 31, 2021 was calculated and then the relevant causes were analyzed. RESULTS: During the statistical period, a total of 3134 patients underwent oral and maxillofacial day surgery. Among them, 72 (2.30%) cases were canceled of day surgery on the same day. Cancellation of oral and maxillofacial day surgery was as followed: patient-related factors(31, 43.05%), disease-related factors (28, 38.89%), epidemic of Covid 19-related(10, 13.89%), and hospital-related factors(3, 4.17%). The top three departments of oral and maxillofacial day surgery cancellation were Department of Preventive Dentistry(7, 7.37%), Department of Oral Surgery(22, 6.56%) and Department of Oral and Craniomaxillofacial Surgery(18,2.77%). CONCLUSIONS: The cancellation rate of oral and maxillofacial day surgery can be reduced by strengthening screening in anesthesia assessment at outpatient clinic, strengthening doctor-patient communication, strengthening health education and epidemic prevention and control in day outpatient management center. 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 （249）      PDF （867KB）（254）       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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Analysis of the use status of internet outpatient in stomatological departments based on AI follow-up TAO Mao-mao, LIU Jun, LIAO Qian, WANG Xu-dong Shanghai Journal of Stomatology    2023, 32 (2): 183-187.   DOI: 10.19439/j.sjos.2023.02.013 Abstract （242）      PDF （657KB）（143）       Knowledge map    PURPOSE: To analyze the use status and satisfaction of the follow-up patients, and explore the construction of internet medical service model and platform in stomatology. METHODS: Patients who visited the internet clinic of stomatology from January to June, 2021 were selected. After diagnosis and treatment, they were followed up by AI intelligent voice with self-designed questionnaire. SPSS 21.0 software was used for statistical analysis. RESULTS: A total of 372 valid questionnaires were collected. The male-to-female ratio of oral patients was 1.25:1, with an average age of 35.96 years. Most of them had a bachelor's degree or above, and the patients were mainly from the Yangtze River Delta. 53.76% of patients needed doctors to prescribe drugs. 81.72% of the dental patients believed that the consultation process of internet clinic was convenient, and 79.83% of patients perceived that the system operation of internet clinic was convenient. Binary logistic regression showed that digital literacy, convenience of medical treatment process were significantly related to the satisfaction of internet outpatient service, while gender, education level, online medical treatment duration and convenience of system operation were not related. CONCLUSIONS: Internet medical treatment in stomatology is feasible, but it is still necessary to break through limitations and further innovate service function. Internet outpatients are mainly young and middle-aged, but it is still necessary to care for the special group of the elderly. It is necessary to further optimize the process, upgrade the system and innovate management, strengthen policy support and incentive mechanism, and promote the transformation of medical service mode in stomatology. Reference | Related Articles | Metrics

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Evaluation on application of 3D printing digital positioning guide in root canal retreatment TIAN Shuo, HASDA Lai, TIAN Tuo, PAN Wen-hui Shanghai Journal of Stomatology    2023, 32 (1): 28-32.   DOI: 10.19439/j.sjos.2023.01.006 Abstract （237）      PDF （860KB）（127）       Knowledge map    PURPOSE: To explore the application of 3D printing digital positioning guide in root canal retreatment. METHODS: Eighty-two isolated teeth collected in Chifeng College Affiliated Hospital from January 2018 to December 2021 were selected, and divided into experimental group and control group by random number table method, with 41 teeth in each group. Both groups were given root canal retreatment. The control group underwent traditional pulpotomy, while the experimental group underwent precise pulpotomy under 3D printing digital positioning guide. The damage of the coronal prosthesis caused by pulpotomy was compared between the two groups, the time of pulpotomy was recorded, removal of root canal fillings in the two groups was counted, fracture resistance of the tooth tissue in the two groups was compared, and the incidence of complications in the two groups was recorded. SPSS 18.0 software package was used for statistical analysis of the data. RESULTS: The ratio of pulp opening area to total dental and maxillofacial area in the experimental group was significantly lower than that in the control group (P<0.05). The pulp opening time in the experimental group was lower than that in the control group(P<0.05), and the root canal preparation time in the experimental group was significantly higher than that in the control group(P<0.05). There was no significant difference in the total time between pulp opening and root canal preparation between the two groups(P>0.05). The removal rate of root canal filling in the experimental group was higher than that in the control group (P<0.05). The failure load value of the experimental group was significantly higher than that of the control group (P<0.05). There was no significant difference in the incidence of total complications between the two groups (P>0.05). CONCLUSIONS: Application of 3D-printed digital positioning guides in root canal retreatment can achieve precise and minimally invasive pulp opening, reduce damage to coronal restorations, preserve more dental tissue, and improve the removal efficiency of root canal fillings and the fracture resistance of dental tissue, as well as performance, safety and reliability. Reference | Related Articles | Metrics

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Study on digital models of normal deciduous dentition in 189 children from Shanghai CAI Yue, ZHANG Man-man, SU Hong-ru, QIAN Wen-hao Shanghai Journal of Stomatology    2023, 32 (3): 308-313.   DOI: 10.19439/j.sjos.2023.03.017 Abstract （234）      PDF （886KB）（154）       Knowledge map    PURPOSE: To study the gender difference and the regulation of growth and development in normal deciduous dentition. METHODS: A total of 189 children with normal deciduous dentition aged 3 to 6 years in several kindergartens in Xuhui District in Shanghai were selected. The three-dimensional(3D) digital dental models were reconstructed by intraoral scanning. Geomagic Studio, a 3D reverse engineering software, was employed to extract the data, such as the dental arc perimeter of C(APC), the dental arc perimeter of E(APE), the dental arc length of C(LC), the dental arc length of E(LE), the dental arc width of C(C-C), the dental arc width of E(E-E), the mesiodistal width of the deciduous crown, the maxillary and mandibular space. SPSS 22.0 software package was used for data analysis. RESULTS: Parameters of deciduous dentition in boys were significantly elevated than in girls(P<0.05). All the boys and girls were divided into 4 groups by age. In 3-year-old group, significant differences were observed in maxillary APC, C-C, E-E(P<0.05) between boys and girls. In 4-year-old group, all boys' parameters were significantly greater than girls'(P<0.05) except maxillary LC. In 5-year-old group, there were significant differences in all the parameters between boys and girl(P<0.05) except maxillary APE and mandibular APC, LC, LE, C-C. No significant difference was observed in all the parameters except mandibular APE in 6-year old group. The significant difference between boys and girls were observed in the mesiodistal width of each deciduous crown except that of the maxillary lateral incisor and mandibular central incisor (P<0.05). There were significant differences in maxillary LE and E-E among children of different ages(P<0.05).The maxillary space was significantly greater than the mandibular space(P<0.01). CONCLUSIONS: There was gender difference in children's normal deciduous dentition, especially when they were 4 years old. Reference | Related Articles | Metrics