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25 December 2023, Volume 32 Issue 6 Previous Issue    Next Issue

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Experimental study of APB-DOCK8 transgenic tomato vaccine for caries prevention LONG Qian, LIAO Cheng-cheng, XIAO Lin-lin, LIU Jian-guo, GUAN Xiao-yan 2023, 32 (6):  561-567.  doi: 10.19439/j.sjos.2023.06.001 Abstract ( 182 )   PDF (1616KB) ( 137 )   PURPOSE: To observe the anti-caries effect of transgenic tomato anti-caries vaccine after immunization with SD rats by gavage and to explore its immunity mechanism initially. METHODS: SD rats were used to establish an experimental caries model. The transgenic anti-caries tomatoes expressing the target protein were cultivated and identified. The SIgA and IgG contents of specific anti-PAcA in saliva and blood samples of SD rats were detected by ELISA. Then, the SD rats were sacrificed, the maxillary and mandibular bones were taken for Keyes dental caries score, and spleens were taken for the analysis of RNA-seq. Statistical analysis was performed with SPSS 18.0 software package. RESULTS: The target protein concentration in the transgenic tomato anti-caries vaccine was 36.28μg/mL. After vaccine immunization of SD rats, group D (8 mL/kg) produced the highest levels of specific SIgA and IgG antibodies at week 6 and was significantly different from the other groups(P<0.05), and caries counting score was also significantly different than the other groups (P<0.05). The spleen mRNA of SD rats in group D was extracted and sequenced by RNA-seq, and 40 genes with significant differences in mRNA expression were obtained(P-adjust<0.05 & |Fold Change|≥1.5). 26 genes were significantly upregulated, including IGFBP6 and COL15A1. The upregulated gene GO enrichment was enriched to humoral immune response, B-cell activation, and immunoglobulin receptor binding; KEGG enrichment was enriched to 56 signaling pathways, including PI3K-AKT and NF-κB, and F<0.001. Fourteen genes were significantly downregulated, but the analysis of downregulated gene GO and KEGG enrichment was not statistically significant(F>0.1). CONCLUSIONS: Transgenic tomato anti-caries vaccine may reduce caries occurrence by upregulating the activation of PI3K-AKT signaling pathway mediated by IGFBP6 in SD rats. References | 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 2023, 32 (6):  568-571.  doi: 10.19439/j.sjos.2023.06.002 Abstract ( 212 )   PDF (607KB) ( 142 )   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. References | Related Articles | Metrics

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The mechanism of scutellarin inhibiting oral leukoplakia carcinogenesis based on network pharmacology and in vitro cytology YE Sai, ZHANG Ying, XIA Rong-hui, ZHOU Yong-mei, WU Lan 2023, 32 (6):  572-577.  doi: 10.19439/j.sjos.2023.06.003 Abstract ( 127 )   PDF (1924KB) ( 123 )   PURPOSE: To investigate the potential mechanisms of scutellarin on oral leukoplakia (OLK) by network pharmacology and further verify by cytology. METHODS: The potential targets of scutellarin acting on OLK were excavated through network pharmacology. PPI network was constructed, and the possible targets and pathways of scutellarin were predicted by GO and KEGG enrichment analysis. CCK-8 and Transwell assays were used to verify the effects of scutellarin on proliferation, migration and invasion of Leuk-1 and Cal-27 cell lines. The expression of related molecules was detected by Western blot to explore potential molecular mechanisms. Statistical analysis was performed with GraphPad Prism 9 software package. RESULTS: There were 29 potential targets of scutellarin acting on OLK, of which HIF-1α was the key target, and the results of GO and KEGG analysis showed that scutellarin was highly involved in the response of cells and tissues to hypoxia and influenced HIF-1 signaling pathway. Scutellarin can significantly inhibit the proliferation (IC50:2 mmol/L), invasion and migration of Leuk-1 and Cal-27 cells(P<0.05), and downregulated the expression of HIF-1α in Leuk-1 and Cal-27 cells. CONCLUSIONS: Scutellarin can inhibit carcinogenesis of OLK by suppressing HIF-1 signaling pathway. References | Related Articles | Metrics

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Clinical comparative study of efficacy of Er:YAG laser for debonding different veneers ZHUANG Jiao-ling, XU Zhi-qiang, JIN Di, WU Qian-ju 2023, 32 (6):  578-582.  doi: 10.19439/j.sjos.2023.06.004 Abstract ( 204 )   PDF (938KB) ( 136 )   PURPOSE: To compare the debonding time of IPS e.max CAD lithium disilicate glass-ceramic veneers in different thickness and transparency using Er:YAG laser, and evaluate the effect of Er:YAG laser on the surface topography of the veneers and the underlying tooth. METHODS: A total of twelve maxillary first premolar teeth were collected and prepared, then veneers were made by computer aided design and computer aided manufacture(CAD/CAM) system. The veneers were divided into four groups according to different thicknesses and transparency: e.max HT with 0.5 mm and 1.0 mm thickness, e.max LT with 0.5 mm and 1.0 mm thickness. Three veneers of each group were cemented to prepared premolar with resin cement and then stored in normal saline solution at room temperature for 7 days. All veneers were debonded with Er:YAG laser and the debonding time of all-ceramic veneers of all groups was recorded. Scanning electron microscopy(SEM) observation was performed to detect the surface topography of the veneers and the underlying tooth. SPSS 19.0 software package was used for statistical analysis. RESULTS: The debonding time of 1.0 mm-thick groups were longer than 0.5 mm-thick groups. When the veneer thickness was 0.5 mm, the average debonding time of e.max LT group was longer than e.max HT. Consistent with the finding of 0.5 mm, the longer debonding time was found in the e.max LT group of 1.0mm. No cracks and crater structure were found in SEM observation of veneers after Er:YAG laser irradiation. Teeth surface was covered with bonding cement with no signs of ablation or damage of the enamel. CONCLUSIONS: Er:YAG laser can completely debond lithium disilicate glass-ceramic veneers, and the debonding time depends on the transparency and thickness of the veneers. The lower translucent porcelain veneers (e.max LT) and thicker ones (1.0 mm-thick) had a longer debonding time. Moreover, Er:YAG laser does not damage the morphology and topography of the veneer and the teeth surface. References | Related Articles | Metrics

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BMP9 promotes osteogenic differentiation of periodontal ligament stem cells under inflammatory environment via ERK5/KLF4 signaling pathway LI Li, LIAN Wen-Wei 2023, 32 (6):  583-589.  doi: 10.19439/j.sjos.2023.06.005 Abstract ( 164 )   PDF (1355KB) ( 113 )   PURPOSE: To explore how bone morphogenetic protein 9(BMP9) promotes the osteogenic differentiation of periodontal ligament stem cells(PDLSCs) via ERK5/KLF4 signaling pathway under an inflammatory environment. METHODS: Recombinant adenovirus to overexpress BMP9 in PDLSCs stimulated with TNF-α was used and the expression level of osteogenic-related genes and proteins in BMP9-treated cells was examined using RT-PCR and Western blot. Then, KLF4 was overexpressed in PDLSCs via transfection and subjected to inflammatory stimulation to observe its effects on osteogenic differentiation and the expression of osteogenic-related genes. overexpression of BMP9 under the condition of KLF4 knockdown was conducted and its effects on osteogenic differentiation and the expression of osteogenic-related genes was analyzed. ERK5 inhibitor BIX02189 was used to explore the role of ERK5 in BMP9-induced osteogenic differentiation. Statistical analysis was performed with SPSS 20.0 software package. RESULTS: BMP9 could promote the osteogenic differentiation of PDLSCs and the expression of KLF4 in an inflammatory environment. Moreover, the overexpression of KLF4 further promoted the osteogenic differentiation of PDLSCs. However, when KLF4 was knocked down, the osteogenic differentiation promotion effect of BMP9 on PDLSCs was weakened. After BMP9 treatment, the phosphorylation level of ERK5 significantly increased. However, after adding ERK5 inhibitor, the promoting effect of BMP9 on osteogenic differentiation was significantly reduced. CONCLUSIONS: BMP9 can promote the osteogenic differentiation of PDLSCs via ERK5/KLF4 signaling pathway in an inflammatory environment. References | Related Articles | Metrics

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Study on the molecular mechanism of circ_0000326 regulating the proliferation, invasion and migration of oral squamous cell carcinoma HSC3 cells by targeting miR-567 LIU Wen-jing, LI Meng-qi, CUI Xiang, WANG Jun-lan 2023, 32 (6):  590-596.  doi: 10.19439/j.sjos.2023.06.006 Abstract ( 142 )   PDF (1491KB) ( 112 )   PURPOSE: To explore the molecular mechanism of circ_0000326 regulating proliferation, invasion and migration of oral squamous cell carcinoma HSC3 cells. METHODS: Cancerous tissue and adjacent tissue specimens of 45 patients with oral squamous cell carcinoma (OSCC) admitted to the Second People's Hospital of Hefei from March 2020 to June 2021 were collected. qRT-PCR was used to detect the expression levels of circ_0000326 and miR-567. CCK-8, plate clone formation test, scratch test and Transwell test were used to detect cell proliferation, clone formation, migration and invasion. Dual luciferase reporter experiment was used to detect the targeting relationship between circ_0000326 and miR-567. Western blot was used to quantify E-cadherin and N-cadherin protein. SPSS 21.0 software package was used for statistical analysis. RESULTS: circ_0000326 expression was 4.01±0.29 in OSCC and 1.00±0.13 in paracancerous tissues, while miR-567 expression was 0.28±0.03 and 1.00±0.10, respectively, with significant differences. Compared with the si-NC group, the cell viability and the number of cell clones in the si-circ_0000326 group were significantly decreased(P<0.05). Compared with the si-NC group, the number of invasive cells and scratch healing rate in the si-circ_0000326 group were significantly decreased (P<0.05), the expression level of E-cadherin protein was significantly increased (P<0.05), and the expression level of N-cadherin protein was significantly decreased(P<0.05). Additionally, circ_0000326 targeted miR-567. miR-567 expression was 1.00±0.00 in pcDNA group, 0.44±0.04 in pcDNA-circ_0000326 group, 0.99±0.06 in si-NC group, and 2.92±0.25 in si-circ_0000326 group with significant differences. Compared with miR-NC group, the cell viability, scratch healing rate, the number of cell clones and the number of invasive cells of miR-567 group were decreased, while E-cadherin protein level was increased(P<0.05). Compared with si-circ_0000326+anti-miR-NC group, the cell viability, scratch healing rate, N-cadherin protein level, the number of cell clones and the number of invasive cells of si-circ_0000326+anti-miR-567 group were increased(P<0.05), while E-cadherin protein level was decreased(P<0.05). CONCLUSIONS: Interference with the expression of circ_0000326 could reduce the ability of OSCC cell proliferation, colony formation, migration and invasion by promoting the expression of miR-567. References | Related Articles | Metrics

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Inhibitory effect of paeoniflorin on CAL27 cells of tongue squamous cell carcinoma and its mechanism LIU Yun, CHEN Hao-yue, MI Jing, WANG Fei-fei, WAN Guang-yong, CUI Chao 2023, 32 (6):  597-602.  doi: 10.19439/j.sjos.2023.06.007 Abstract ( 146 )   PDF (1319KB) ( 97 )   PURPOSE: To investigate the inhibitory effect of paeoniflorin(PF) with different concentrations on CAL27 cells of tongue squamous cell carcinoma in vitro and its possible mechanism. METHODS: CCK-8 technique and clone formation trial were used to detect the effect of PF on the proliferation and clone formation of CAL27 cells. Scratch test and Transwell method was used to detect the effects of PF on migration and invasion of CAL27 cells. Staining of Hoechst33342 was employed to evaluate the influence of PF on apoptosis of CAL27 cells, while Western blot was utilized to investigate the effect of PF on the expression of NF-κB pathway related proteins and EMT related proteins. The effect of PF on NO production in CAL27 cells was detected by nitric oxide detection kit. Statistical analysis was performed with SPSS 27.0 software package. RESULTS: PF inhibited proliferation, migration, and invasion of CAL27 cells in vitro in a concentration-dependent way. Moreover, PF caused apoptosis of CAL27 cells. PF impeded NF-κB pathway activity, decreased the expression of P-P65, further reduced the expression of iNOS and MMP-9, suppressed the production of NO, and concurrently inhibited Vimentin,promoted E-cadherin. CONCLUSIONS: Paeoniflorin inhibits the proliferation, migration and invasion of CAL27 cells, which may play an anti-cancer role by inhibiting the activation of NF-κB pathway and EMT. References | Related Articles | Metrics

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Applied anatomical characteristics of vascularized iliac muscle flap and its clinical application in repairing oral and maxillofacial defects ZHANG Yang, ZHU Qing-hai, ZHANG Yong-jie, WANG Chen-xing, YE Jin-hai 2023, 32 (6):  603-608.  doi: 10.19439/j.sjos.2023.06.008 Abstract ( 160 )   PDF (2130KB) ( 125 )   PURPOSE: To investigate the feasibility and safety of the deep circumflex iliac artery (DCIA) derived chimeric flap through the anatomical study of the blood vessels and perforating branches in the ilioinguinal region, and to provide the basis for selecting different DCIA chimeric flap schemes according to the difficulty of surgery, defect conditions and repair needs. METHODS: Six Chinese adult specimens were dissected by retrograde perfusion of red latex into bilateral femoral arteries. At the same time, the length, diameter and main branch position of DCIA vascular pedicle were measured in 12 lower limb CTAs, and compared with the anatomical data. Six patients with oral tumors accompanied by mandibular defects who were treated in the Department of Oral and Maxillofacial Surgery, Affiliated Stomatological Hospital of Nanjing Medical University from July 2020 to November 2021 were repaired and reconstructed with the chimeric iliac myofascial flap. The postoperative appearance and occlusal function of the recipient area were observed. SPSS 19.0 software package was used for data analysis. RESULTS: A total of 19 DCIA perforators with an external diameter of ≥ 0.5 mm were found in 12 specimens of ilioinguinal region. These perforators were distributed in the 5 cm×3 cm area, inside the ilium and 5cm behind the anterior superior iliac spine. The length of DCIA vascular pedicle was (6.73±1.06) cm. The measured value of the external diameter of the starting position of the vascular pedicle was (2.55±0.29) mm. The outer diameter of DCIA skin perforator penetrating deep fascia was (1.12±0.14) mm. In the CTA analysis of 12 lower limbs, it was found that the length of DCIA vascular pedicle was (6.98±0.62) cm. The measured diameter at the original position of vascular pedicle was (2.35±0.20) mm. Six cases of mandibular defects were repaired with iliac internal oblique fascia mosaic flap. Six cases of lliac flap survived successfully after operation. Follow up for 6 to 24 months (average 12 months) showed that the mandibular shape and function recovered well, the intraoral myofascial flap became mucosal, and the implanted iliac bone showed no significant volume change on CT after operation. Walking and weight bearing in donor area were basically normal, and no abdominal hernia occurred. CONCLUSIONS: DCIA and its main branches have a relatively constant course and distribution in the ilioinguinal region. According to the conditions of different defect areas, different tissue types of chimeric flaps based on DCIA can be prepared to meet the repair requirements. The donor site complications can be controlled, and it is an ideal choice to repair mandibular defects. References | Related Articles | Metrics

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The prognosis of neck dissection with sternocleidomastoid muscle preservation and resection in advanced oral squamous cell carcinoma: a retrospective cohort analysis CHEN Xing-jin, FAN Ran-yi, TAO Shi-cheng, XUE Rui, WEN Xu-tao, MAI Hua-ming 2023, 32 (6):  609-614.  doi: 10.19439/j.sjos.2023.06.009 Abstract ( 146 )   PDF (952KB) ( 97 )   PURPOSE: To investigate the prognosis of advanced oral squamous cell carcinoma (AOSCC) patients undergoing neck dissection with sternocleidomastoid muscle (SCM) preservation and resection. METHODS: From January 2013 to June 2017, a total of 235 AOSCC patients(stage Ⅲ and stage Ⅳ) who were diagnosed and underwent neck dissection at the Department of Oral and Maxillofacial Surgery, College and Hospital of Stomatology, Guangxi Medical University, were collected and followed-up. The differences in overall survival（OS）, local recurrence-free survival (LRFS) and regional recurrence-free survival (RRFS) were compared between different surgical procedures. SPSS 25.0 software package was used for statistical analysis. RESULTS: Among 235 patients with postoperative follow-up, 101 patients retained the SCM during operation, and 134 patients had SCM removed. There was no significant difference in 5-year survival rate and 5-year regional recurrence rate between the SCM preservation group and the SCM resection group. Kaplan-Meier method of univariate analysis showed that SCM preservation or resection had no significant difference in OS, LRFS and RRFS. Cox multivariate regression analysis results showed that there was no significant difference between different surgical procedures in OS, LRFS and RRFS, while N stage and postoperative chemoradiotherapy were independent influencing factors for OS, LRFS and RRFS in AOSCC patients. CONCLUSIONS: Neck dissection with SCM preservation in AOSCC patients has no effect on survival and recurrence (including local recurrence and regional recurrence). It is feasible for AOSCC patients to undergo SCM-preserving neck dissection when metastatic cervical lymph nodes do not invade SCM. N stage and postoperative chemoradiotherapy affect the prognosis of AOSCC patients. References | Related Articles | Metrics

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Application of Demirjian and Chaillet method in age estimation of Uyghur and Han children and adolescents in Urumqi DUAN Si-chen, GENG Ji-wen, WANG Yu, LIU Jia 2023, 32 (6):  615-622.  doi: 10.19439/j.sjos.2023.06.010 Abstract ( 132 )   PDF (836KB) ( 114 )   PURPOSE: To evaluate the applicability and accuracy of Demirjian and Chaillet method in estimating the actual age of Uygur and Han children and adolescents in Urumqi. METHODS: A total of 1144 orthopantomograms were included in the study, and the seven permanent teeth in the left jaw were divided into different stages according to two dental age estimation methods, and the dental age was converted to tooth age after checking the table and assigning points, and the dental age and its chronological age were compared with t test or rank sum test using SPSS 21.0 software package, and the accuracy of the two methods was evaluated by comparing the mean absolute error of the two methods. RESULTS: Demirjian method was overestimated by an average of 0.46 years (0.47 years for males and 0.43 years for women) in the Han population, 0.36 years for men and 0.26 years for women in Uyghur population, the difference was significant between Uyghur and Han boys (P<0.05). Chaillet method yielded an average underestimate of 0.01 years (0.04 years for men and -0.08 years for women) in the Han population, and 0.08 years(0.02 years for men and -0.21 years for women) in the Uyghur population, there was no significant difference between Uyghur and Han boys and girls(P>0.05). CONCLUSIONS: When assessing the age of Uyghurhan children and adolescents in Urumqi, Chaillet method is more accurate than the Demirjian method. When applying dental age estimation method in different regions, it is necessary to evaluate the accuracy of the estimation method and revise it if necessary to improve the accuracy. References | Related Articles | Metrics

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Measurement of cortical bone thickness of zygomatic alveolar ridge in adolescents by Cone-beam CT and its correlation with cervical vertebral bone age PENG Yuan-hao, ZHUANG Xin-yi, YU Ting, LYU Dong-mei, WEN Xiu-jie, CHENG Qian 2023, 32 (6):  623-629.  doi: 10.19439/j.sjos.2023.06.011 Abstract ( 145 )   PDF (979KB) ( 106 )   PURPOSE: To measure the cortical bone thickness of zygomatic alveolar ridge in adolescents and explore the correlation between cortical bone thickness and cervical vertebral bone age. METHODS: Cone-beam CT data of 80 adolescents were collected, including 20 adolescents with cervical vertebral bone ages of Cvs3, Cvs4, Cvs5 and Cvs6, respectively. CBCT images were reconstructed with the maxillary occlusal plane as the reference plane. Cortical bone thickness of different slices in the left maxillary zygomatic alveolar ridge area was measured in the direction parallel to and 60° from the reference plane, and the measured data were statistically analyzed by SPSS 21.0 software package. RESULTS: When the measurement direction was parallel to the reference plane and at 60°, the cortical bone thickness in the zygomatic alveolar ridge area of Cvs3-Cvs6 adolescents was (0.90±0.09) -(1.72±0.21) mm and (1.35±0.44)-(3.98±1.48) mm, respectively. There was significant difference in cortical bone thickness between Cvs4 and Cvs5 group(P<0.05). Spearman correlation analysis showed a strong positive correlation(P<0.01) between cortical bone thickness of zygomatic alveolar ridge and cervical vertebral bone age in adolescents. CONCLUSIONS: The cortical bone thickness of zygomatic alveolar ridge in adolescents increases with the increase of cervical vertebral bone age, and the cortical bone thickness may increase significantly during Cvs4-Cvs5. In terms of cortical bone thickness, all slices of zygomatic alveolar ridge of CVS3-CVS6 adolescents are suitable for implanting miniscrews, and the anterior slices should be selected for implantation as far as possible for Cvs3 and Cvs4 adolescents. References | Related Articles | Metrics

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BRAF V600E expression in ameloblastomas, ameloblastic carcinomas and cysts PEI Jing, ZHANG Lin, JIA Yun-xiang, CHEN Wei-hua 2023, 32 (6):  630-634.  doi: 10.19439/j.sjos.2023.06.012 Abstract ( 161 )   PDF (812KB) ( 114 )   PURPOSE: To investigate protein and genetic status of BRAF V600E in ameloblastomas, ameloblastic carcinomas and cysts, and to explore if recurrence and malignant transformation of ameloblastomas depends on BRAF status. METHODS: Twenty cysts, 25 primary ameloblastomas, 25 recurrent ameloblastomas and 8 ameloblastic carcinomas were analysed by immunohistochemistry, and 2 cysts, 5 primary ameloblatomas, 5 recurrent ameloblastomas, 3 atypical ameloblastomas and 6 ameloblastic carcinomas were analysed by quantitative real-time PCR(qPCR). SPSS 26.0 software package was used for data analysis. RESULTS: There was no correlation between BRAF V600E expression and recurrence. Cysts and carcinomas had lower frequencies of BRAF V600E mutations than ameloblastomas. There was a concordance between positive staining of BRAF V600E protein and BRAF V600E mutation. CONCLUSIONS: BRAF V600E mutation may be useful in the differential diagnosis of ameloblastomas with cysts and ameloblastic carcinomas. Immunohistochemistry may be a beneficial method to screen for BRAF V600E mutation in ameloblastoma. References | Related Articles | Metrics

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Changes in tongue position and three-dimensional changes in upper airway before and after treatment with Twin-block combined with maxillary expansion appliance in children with mandibular retrusion WANG Meng, TAO Li-ming, HU Ya-nan 2023, 32 (6):  635-639.  doi: 10.19439/j.sjos.2023.06.013 Abstract ( 155 )   PDF (1329KB) ( 126 )   PURPOSE: To observe changes of upper airway in three dimensions and tongue position after correction with Twin-block combined with maxillary expansion appliance in children with mandibular retrusion and history of mouth breathing. METHODS: Twenty children with Class Ⅱ malocclusion and mandibular retrusion were selected and treated with Twin-block combined with maxillary expansion appliance. Cone-beam CT(CBCT) data before and after treatment were imported into Mimics 21.0 software to measure the total volume of the upper airway (nasopharyngeal segment + oropharyngeal segment), as well as segmental airway volume of nasopharyngeal, glossopharynx and oropharyngeal space. The cross-sectional area and maximum sagittal diameter at the tip of uvula in glossopharyngeal airway,and maxillary width were measured, too. Anterior-posterior and height changes of tongue position were observed. SPSS 26.0 software package was used to perform paired sample t test and Wilcoxon signed rank test of the data. RESULTS: The total upper airway volume and the airway volume of the nasopharyngeal, oropharyngeal and glossopharyngeal segments increased significantly after correction. The cross-sectional area and maximum sagittal diameter at the tip of uvula in glossopharyngeal segment, and the maxillary width were increased significantly.Tongue position increased and moved forward. All the above data had significant different(P<0.05). CONCLUSIONS: Twin-block combined with maxillary expansion appliance can increase the total volume of the nasopharyngeal segment, oropharyngeal segment, glossopharyngeal segment and upper airway in children with Class Ⅱ malocclusion and mandibular retrusion and expand the anterior-posterior depth of oropharynx airway.In addition,the treatment can increase maxillary width and normalize the tongue position, and contribute to the improvement of airway patency. References | Related Articles | Metrics

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Expression and clinical significance of NEK2 and EMT related molecules in oral squamous cell carcinoma YE Ting-ting, CHEN Wei-hua, PEI Jing, JIA Yun-xiang, WU Hai-ying 2023, 32 (6):  640-644.  doi: 10.19439/j.sjos.2023.06.014 Abstract ( 121 )   PDF (999KB) ( 100 )   PURPOSE: To investigate the expression and significance of NEK2 and EMT-related molecules in oral squamous cell carcinoma (OSCC). METHODS: The expression levels of NEK2 and EMT-related molecules (E-Cadherin, N-Cadherin, Vimentin) in 60 cases of primary OSCC tissues and normal oral mucosa tissues were detected by immunohistochemistry(IHC). NEK2 mRNA expression in 25 OSCC tissues and 10 normal oral mucosa tissues was detected by qRT-PCR. Statistical analysis was performed using SPSS 26.0 software package. RESULTS: The expression of NEK2, N-Cadherin, and Vimentin increased in OSCC tissues, while the expression of E-Cadherin decreased(P<0.05). The worse the differentiation, the higher the expression of NEK2 and the lower the expression of E-Cadherin(P<0.05). CONCLUSIONS: NEK2 can be used as a prognostic marker for OSCC. The up-regulation of NEK2 and the changes in the expression levels of EMT related molecules can promote the occurrence and development of OSCC. References | Related Articles | Metrics

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Effect of ultrasonic curettage combined with sodium hyaluronate gel on chronic periodontitis and its effect on inflammatory factors hs-CRP, MCP-1 and MMP-13 in gingival crevicular fluid YANG Fan, LAN Xu, JIN You-hong 2023, 32 (6):  645-649.  doi: 10.19439/j.sjos.2023.06.015 Abstract ( 139 )   PDF (599KB) ( 133 )   PURPOSE: To investigate the effect of ultrasonic curettage combined with sodium hyaluronate gel in the treatment of chronic periodontitis (CP) and the effect on inflammatory factor hypersensitive C-reactive protein (hs-CRP), monocyte chemotactic protein 1 (MCP-1) and matrix metalloproteinase 13 (MMP-13) in gingival crevicular fluid. METHODS: A total of 102 patients with CP from October 2021 to October 2022 were selected, divided into experimental group (n=51) and control group (n=51) by random number table method. The control group received ultrasonic subgingival curetage, and the experimental group received sodium hyaluronate gel adjuvant therapy on the basis of the control group. The periodontal rehabilitation indexes, clinical efficacy and the changes of gingival crevicular fluid hs-CRP, MCP-1 and MMP-13 were compared between the two groups. The periodontal pathogens, bone metabolism indexes and the occurrence of adverse events during treatment were compared between the two groups. The data were statistically analyzed using SPSS 22.0 software package. RESULTS: After treatment, the sulcus bleeding index (SBI), gingival index (GI), plaque index (PLI), periodontal pocket depth (PD) and attachment level (AL) of the two groups were significantly lower than before treatment (P<0.05), and even significantly lower(P<0.05) in the experimental group. Total effective rate of the experimental group was significantly higher than that of the control group(P<0.05). hs-CRP, MCP-1 and MMP-13 in both groups after treatment were significantly lower than before treatment(P<0.05), and hs-CRP, MCP-1 and MMP-13 in the experimental group after treatment were significantly lower than those in the control group(P<0.05). The detection rates of Porphyromonas gingivalis, Forsetanella and Treponema dentalis were significantly lower in both groups after treatment than before treatment (P<0.05), and the detection rates of the above indexes in the experimental group after treatment were significantly lower than those in the control group(P<0.05). After treatment, the C-terminal peptide(CTX) of type Ⅰ collagen was significantly lower than that before treatment, and bone gla protein(BGP) was significantly higher than that before treatment(P<0.05). The CTX and BGP of the experimental group were significantly lower than that of the control group and significantly higher than that of the control group(P<0.05). There was no significant difference in the incidence of total adverse reactions between the two groups(P>0.05). CONCLUSIONS: Ultrasonic curettage combined with sodium hyaluronate gel in the treatment of CP can promote periodontal tissue rehabilitation, enhance short-term efficacy, inhibit synthesis of inflammatory factors in gingival crevicular fluid, kill periodontal pathogens, regulate bone metabolism, and is safe and reliable. References | Related Articles | Metrics

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Evaluation of the efficacy of combined application of concentrated growth factors in ridge preservation of teeth with severe periodontitis XIA Ting-ting, WANG Yong 2023, 32 (6):  650-655.  doi: 10.19439/j.sjos.2023.06.016 Abstract ( 154 )   PDF (1451KB) ( 131 )   PURPOSE: To evaluate the efficacy of combination of deproteinized bovine bone matrix and concentrated growth factors in maintaining the three-dimensional contour of alveolar bone in ridge preservation of teeth with severe periodontitis. METHODS: Thirty patients with posterior teeth suffering from severe periodontitis requiring extraction and with the intention of implant restoration were selected and randomly divided into the experimental group and control group, with 15 cases in each group. In the experimental group, DBBM combined with CGF fluid was used as bone graft material and placed in the extraction socket of the patient after minimally invasive tooth extraction and thorough debridement,while DBBM was used in the control group mixed with normal saline as the bone graft material.The extraction wounds of both groups were covered with absorbable biofilm and free gingival tissue. CBCT was performed at the initial diagnosis, immediately after operation, and 6 months after operation, and the CT images were imported into Mimics 20.0 software package to measure the difference after fitting to obtain data, SPSS 26.0 software package was used for statistical analysis of the data. RESULTS: The vertical height of the alveolar bone in the experimental group and the control group was significantly increased 6 months after operation compared with the initial diagnosis (P<0.05), but there was no significant difference between the 2 groups(P>0.05). There was significant difference in the change of the alveolar bone width at 1 mm below the alveolar crest between the two groups at the initial diagnosis and 6 months after operation(P<0.05), and the horizontal width absorption in the experimental group was smaller than that in the control group. The horizontal absorption rate of bone graft material in the two groups at 1 mm below the alveolar crest showed that the experimental group was lower than the control group, and the difference was statistically significant(P<0.05). CONCLUSIONS: Compared with DBBM alone, combined application of DBBM and CGF can better maintain the alveolar bone contour of the extraction socket with severe periodontitis. References | Related Articles | Metrics

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Clinical study of the effect of combined orthodontic and restoration treatment for introverted deep overbite patients with severe wear WANG Jing, LU Qian, ZHOU Jian-ying, PANG Shu-ting, FENG Yan-fen, LU Wen-juan, ZHANG Qian 2023, 32 (6):  656-660.  doi: 10.19439/j.sjos.2023.06.017 Abstract ( 152 )   PDF (741KB) ( 108 )   PURPOSE: To investigate the effectiveness of combined orthodontic and restoration treatment for introverted deep overbite patients with severe wear. METHODS: A total of 86 introverted deep overbite patients with severe wear admitted to Cangzhou People's Hospital from December 2020 to June 2022 were collected and divided into the control group and the experimental group by gender, age, degree of wear and tear, with 43 cases in each group. The control group received orthodontic treatment, while the experimental group received combined orthodontic and restoration treatment. The gingival index (GI), periodontal index(PI), smile index, temporomandibular joint space [anterior space, superior space, posterior space and In (P/A)], tooth function (chewing function, pronunciation function, dental occlusal function) and chewing efficiency of 2 groups before and after treatment were compared. Statistical analysis was performed with SPSS 22.0 software package. RESULTS: Compared with the control group, the orthodontic treatment time of the experimental group patients was significantly reduced(P<0.05). Before treatment, there was no significant difference in GI, PI, smile index, buccal gap rate, temporomandibular joint space, swallowing function and chewing efficiency between 2 groups(P>0.05). After treatment, compared with the control group, the GI, PI, anterior space were significantly reduced(P<0.05); the smile index, posterior space and In (P/A), chewing function, pronunciation function, tooth occlusion and chewing efficiency significantly increased (P<0.05). CONCLUSIONS: Both orthodontic treatment and combined orthodontic and restoration treatment can be used to treat introverted deep overbite patients with severe wear. However, combination of orthodontic and restoration treatment has significant advantages. References | Related Articles | Metrics

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Study on the thickness and morphology of lingual bone of impacted mandibular third molar based on CBCT and Simplant 3D reconstruction ZHAO Jun, WU Xiao-bo, LIU Na, HAO Xin-he 2023, 32 (6):  661-667.  doi: 10.19439/j.sjos.2023.06.018 Abstract ( 141 )   PDF (789KB) ( 121 )   PURPOSE: The potential relationship between impacted mandibular third molar and lingual bone thickness was investigated by quantitative measurement of lingual bone thickness, and a three-dimensional visualization model of lingual bone was established. METHODS: Image data of 200 cases of mandibular impacted third molar were collected from the database of Hefei Stomatological Hospital. Thickness measurement and three-dimensional reconstruction of lingual bone at different measurement sites were performed by Simplant Pro software. Statistical analysis was performed using SPSS 22.0 software package, and the comparison of lingual thickness at different measurement sites was performed using rank sum test. Whether the thickness of bone plate was "high-risk type" was taken as the result variable, different related factors were analyzed by logistic regression. RESULTS: The lingual bone at the middle point of the root of the third molar was the thinnest. Multiple teeth, mesio-inclined and dial-inclined teeth, and Class Ⅱ and Ⅲ impacted teeth had thin lingual bone(P<0.05). The mesial and distal inclines were observed, and the lingual bone was thin in the root apical region of the teeth in Class Ⅱ and Class Ⅲ(P<0.05). In the lower impacted teeth, the thin lingual bone at the central crown site was more likely to be found in Class Ⅲ teeth(P<0.05). CONCLUSIONS: The thickness of lingual bone was related to the number of impacted tooth roots, tilt direction and impacted type. In the extraction of impacted teeth, the above factors should be considered, and the injury of lingual nerve, lingual bone and surrounding soft tissue should be vigilant. References | Related Articles | Metrics

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Effect of gingival biotype on total crown repair and gingival crevicular fluid inflammatory factors GAI Yun, LIU Zhi-ming, ZENG Shen 2023, 32 (6):  668-672.  doi: 10.19439/j.sjos.2023.06.019 Abstract ( 134 )   PDF (608KB) ( 119 )   PURPOSE: To explore the effect of thick and thin sputum on the restoration of oral anterior teeth and the index of gingival crevicular fluid. METHODS: A study was conducted on 80 patients (130 teeth) who underwent full-ceramic crown treatment for anterior tooth restoration in Jiangnan University Affiliated Hospital 's oral clinic. The patients were divided into thick gingival type (42 cases, 67 teeth) and thin gingival type (38 cases, 63 teeth) according to their gingival biotype. The two groups were compared before and after the restoration with improved plaque index (mPI), modified bleeding index (mBI), probing depth (PD), clinical evaluation score of oral prosthesis, tumor necrosis factor-alpha (TNF-alpha) and IL-1 β(interleukin-1β) in gingival crevicular fluid. Statistical analysis was performed with SPSS 21.0 software package. RESULTS: Before treament, there were no significant differences in mPI, mBI and PD between the two groups (P>0.05); 12 months after treament, mPI, mBI and PD of the thin gingiva group were significantly lower than those of the thick gingiva group(P<0.05). Before treament, there were no significant differences in TNF-α and IL-1β levels in gingival crevicular fluid between the two groups(P>0.05); 12 months after treament, TNF-α and IL-1β levels of the thin gingiva group were significantly lower than those of the thick gingiva group(P<0.05). Six months after treament, there were no significant differences in prosthesis integrity, marginal adaptation, color matching, periodontal health status and secondary caries scores between the two groups (P>0.05); 12 months after treament, the marginal adaptation, periodontal health status and secondary caries scores of the thick gingiva group were significantly higher than those of the thin gingiva group(P<0.05); the marginal discoloration score of the thick gingiva group was significantly lower than that of the thin gingiva group at 6 months and 12 months after treament(P<0.05). CONVLUSIONS: The thin sputum type is more conducive to repairing the oral cavity after treatment, and is beneficial to the maintenance of oral health condition after repair. The gingival index of the thick sputum type patient will be significantly increased after repair, and the risk of gingival inflammation is increased. The aesthetic effect is better than the thin sputum type. References | Related Articles | Metrics