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Preliminary development and cytotoxicity of Eucommia ulmoides gum composite soft denture liner LUO Heng, GAO Hai, XU Xue-fei, FENG Yun-zhi Shanghai Journal of Stomatology    2019, 28 (4): 378-383.   DOI: 10.19439/j.sjos.2019.04.008 Abstract （3974）      PDF （4262KB）（242）       Knowledge map    PURPOSE: To prepare a soft lining material with high elastic on the basis of excellent characteristics of Eucommia ulmoides gum, and explore its basic physical performance and cytotoxity. METHODS: Basic formula was used based on the existing formula of elastic Eucommia ulmoides gum and medical rubber, then hardness, tensile strength and elongation at break were investigated to determine the final formula of the material, named Eucommia ulmoides gum composite soft denture liner. L929 mouse fibroblasts cultured in vitro were used to detect the toxic effects of 50% of leaching solution released from three kinds of denture soft lining materials by MTT assay. Statistical analysis was performed using SPSS16.0 software package. RESULTS: The kinds and blending proportion of rubber matrix had significant impact on mechanical properties of Eucommia ulmoides gum composite soft denture liner, the addition of Eucommia ulmoides gum significantly increased the hardness, tensile strength and elongation at break of the butadiene rubber. MTT assay showed Eucommia ulmoides gum composite soft denture liner did not have cytotoxicity on L929 mouse fibroblasts. The toxicity levels of 5 groups of Eucommia ulmoides gum composite soft denture liner in the 2nd, 4th, 7th day were maintained in the first stage, only 70:30 group reached the second stage on the 7th day. The cell relative appreciation rate of Silagum and 5 groups of Eucommia ulmoides gum composite soft denture liner in 2nd, 4th, 7th day were significantly higher than that in the self-curing acrylic soft lining material (P<0.05). CONCLUSIONS: Eucommia ulmoides gum and butadiene rubber blend ratio of 70:30, adding appropriate amount of zinc oxide, magnesium, stearic acid, sublimed sulfur, CZ, antioxidants, can get optimum mechanical properties. Eucommia ulmoides gum composite soft denture liner has no effect on L929 fibroblasts proliferation, indicating good biocompatibility. Reference | Related Articles | Metrics

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Clinical evaluation of modified Xiaoyao pill on the treatment of oral lichen planus patients with anxiety or depression LIU Wei-dong, ZHAO Min Shanghai Journal of Stomatology    2019, 28 (3): 312-316.   DOI: 10.19439/j.sjos.2019.03.018 Abstract （1846）      PDF （3713KB）（248）       Knowledge map    PURPOSE: To investigate the clinical effect and safety of modified Xiaoyao pill on the treatment of oral lichen planus (OLP) patients with anxiety or depression. Methods: Sixty OLP patients with anxiety and depression were randomly divided into 2 groups, treated separately with hydroxychloroquine(HCQ, control group) and HCQ+modified Xiaoyao pill(experimental group). The results were measured with semi quantitative reticular erosive and ulcerative lesion (REU) and visual analogue scale（VAS） scoring system at the first visit, the second week, the fourth week and the eighth week, respectively. Data analysis was performed using SPSS 18.0 software package. Results: The clinical effect of HCQ+modified Xiaoyao pill was better than that of the HCQ. The REU, VAS scores were lower after treatment in both groups (P<0.05), but the effect of the experimental group was more remarkable in reducing the pain indexes, accelerating the healing of erosive lesion and preventing recurrence than the control group. There was no significant difference in the overall effective rate between the two groups (P>0.05). Conclusions: Modified Xiaoyao pill was effective and safe in the treatment of OLP patients with anxiety or depression, especially for EOLP. Reference | Related Articles | Metrics

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The relationships between different surgical approaches for maxillary sinus augmentation and implant failure and complications: a retrospective cohort study HAO Xin-he, YE hu, ZHAI Qin-kai Shanghai Journal of Stomatology    2021, 30 (2): 214-218.   DOI: 10.19439/j.sjos.2021.02.021 Abstract （1812）      PDF （4109KB）（377）       Knowledge map    PURPOSE: To investigate the 5-year survival and complication rates of implants placed in grafted sinuses with different surgical approaches and analyze the causes for failure. METHODS: This study retrospectively observed the prognosis of patients who underwent maxillary sinus augmentation by means of lateral window technique(LWT) or transalveolar osteotomy technique (TOT) and simultaneously installed implants performed, in Hefei Stomatological Hospital. The primary predictor variables were surgical approaches, including LWT and TOT. The primary outcome measurement was the 5-year implant survival rate, complication rates and failure causes. Potential confounders included diabetes, age at surgery, gender, smoking habit, oral hygiene, tooth position, length and diameter of implants and type of prosthesis. Chi-square test and logistic regression analysis were performed with SPSS 21.0 software package. RESULTS: Fifty-nine patients (31 males and 28 females), installed with 93 implants, with a mean age of (61.3±10.1) years old, were enrolled. Over (5±1.2) years of follow-up, five implants failed, with a total survival rate of 94.6%. In detail, there were 3 failed implants in the LWT group and 2 failed implants in the TOT group, for a survival rate of 85.7% and 97.2%, respectively. Chi-square test showed that smoking habit (χ2=6.662, P=0.010), oral hygiene(χ2=4.352, P=0.037) as well as operative approach(χ2=4.232, P=0.040) were significantly associated with the final survival rates, multivariate logistic regression analysis displayed that smoking habit (OR=0.030, 95%CI: 0.002-0.493, P=0.014) was still associated with the finial survival rates. Surgical approach(χ2=5.000, P=0.025) was markedly related to causes for the failed implants. Of which, three (100%) failed implants in the LWT group was due to poor osseointegration and implant mobility 3 months after sinus augmentation, and 2(100%) in the TOT group was because of persistent peri-implantitis and loss of the graft or alveolar bone 4 years after sinus augmentation. Smoking habit was also significantly relevant to complication rates(χ2=12.433, P=0.014), and the occurrence incidence of controllable peri-implantitis in patient having a smoking habit was relatively higher, accounting for 6.8%(6/88), compared with patients without smoking habit. Significant relationship between surgical approaches and implant complications was not observed(χ2=9.453, P=0.051). CONCLUSIONS: Different surgical approaches for maxillary sinus augmentation do not significantly correlate with implant survival rates and implant complications. However, surgical approach is markedly related to the causes of failed implants. Smoking will lead to a decreased implant survival rate and controllable peri-implantitis. Reference | Related Articles | Metrics

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Effect of two manual mixing methods on the accuracy of alginate impression ZHOU Li-hui, WANG Di, HUANG Hai-ying, ZHANG Yong-fang Shanghai Journal of Stomatology    2019, 28 (2): 133-135.   DOI: 10.19439/j.sjos.2019.02.005 Abstract （1635）      PDF （2286KB）（38）       Knowledge map    PURPOSE: The effect of clockwise mixing method and clockwise combined eight-shaped mixing method on the accuracy of alginate impression was compared. METHODS: From march to April 2018, 40 dental restoration cases in the Department of Stomatology, Zhoupu Hospital, Pudong District, Shanghai were selected. Two nurses and the same doctor treated 40 patients with single crown porcelain restoration. Two sets of models were taken by two kinds of mixing methods, which were divided into experimental group and control group. Clockwise manual mixing method was used in the control group to take the model, while clockwise combined eight-shaped mixing method was used in the experimental group to take the model. SPSS 24.0 software package was used for Mann-Whitney rank sum test. RESULTS: The same high-grade technician used a magnifying glass to observe the prepared impression, recorded the shoulder print, the sulcus wing and bubble generation, and comprehensively evaluated the impression quality. A comparison was made between the two groups, Z=-4.634, P<0.001, and the difference was statistically significant. Among them, the ratio of excellent quality of the clockwise combined eight-shaped mixing method (77.5%) was significantly higher than that of the clockwise mixing method (10%), and the proportion of level IV unqualification (2.5%) was significantly lower than that of the clockwise mixing method (27.5%). CONCLUSIONS: The quality of impression using clockwise combined eight-shaped mixing method is higher than that of the clockwise method, which improves the success rate of the mold and reduces the discomfort caused by repeated impression. Application of this technique is helpful to the promotion of occult knowledge among nurses. Reference | Related Articles | Metrics

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Preliminary study on root canal morphology of maxillary second molars LI Li, ZHAN Fu-liang, JIN Ying-wu Shanghai Journal of Stomatology    2014, 23 (2): 179-183.   Abstract （1618）   HTML （1）    PDF （982KB）（338）       Knowledge map    PURPOSE: To investigate the root canal morphology and anatomy of maxillary second molars using transparent tooth technique and cone-beam computed tomography (CBCT), and explore the consistency of 2 methods in identifying root canal configurations and morphology. METHODS: Fifty extracted maxillary second molars were scanned by CBCT and analyzed using assistant software. Root canal configurations of each root were identified based on Vertucci's classification and recorded. All transparent teeth samples were made with modified root canal staining technique, and the root canal configurations of each root were classified based on Vertucci's classification. The results were analyzed statistically with SPSS17.0 software package. RESULTS: According to transparent tooth technique, typeⅠ was the most common configuration in distobuccal root and palatal root. An additional configuration type 3-2-2 was found in the present study, which was not included in Vertucci’s classification. The wide variety of canal systems was seen in the mesiobuccal root. TypeⅠconfiguration was most prevalent(54.4%), followed by TypeⅡ, Ⅳ, Ⅴ, Ⅵ. The prevalence of second canal in mesiobuccal root (MB2) was 41.3%. The results of canal morphology and configuration were consistent between transparent tooth technique and CBCT. CONCLUSIONS: Maxillary second molars have the most complex root and canal morphology, especially for the mesiobuccal root. For identifying root canal and root anatomy, CBCT can be used as an alternative to transparent tooth technique in clinical practice. The application of 3D reconstruction based on CBCT helps us to visualize the root canal anatomy. Reference | Related Articles | Metrics Cited: Baidu(8)

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Shanghai Journal of Stomatology    2006, 15 (3): 225-249.   Abstract （1478）            Knowledge map    Related Articles | Metrics

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Facial proportions and comparison of the Han and Uygur adult in Xinjiang area MENG Kang, ADALET Khasim, YU Xin-wei, GAO Cheng-zhi Shanghai Journal of Stomatology    2015, 24 (4): 479-482.   Abstract （1422）   HTML （0）    PDF （466KB）（335）       Knowledge map    PURPOSE: To explore the vertical and horizontal proportions of the face and difference between the Han and Uygur normal adults in Xinjiang area. METHODS: According to certain standards, the adult Han and Uygur college students in Urumqi City were randomly selected for this study. These students were divided into male and female groups. Frontal photographs were taken for every subject in accordance with same standards. The data was imported into computer, with 20 standard anthropometric marks be determined, and 15 measurements were performed through Photoshop software. Independent sample t test was applied for measuring results by SPSS19.0 software package. RESULTS: The face of males were shorter and wider than that of females. Compared with the females, the males had bigger alar width. However, the Han adults had smaller palpebral fissure and mouth width, bigger alar and intercanthal compared with the Uygur adults. CONCLUSIONS: This study suggests that there are significant differences between 2 nationalities and sexes in facial proportions in Xinjiang area. Reference | Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 0-封2.   Abstract （1371）      PDF （329KB）（135）       Knowledge map    Related Articles | Metrics

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Correlation between adenoid hypertrophy, maxillary sinus mucosal thickening and dentofacial development in children XU Ya-fen, XU Yi-li, LI Zhe-hang, LEI Yong-hua Shanghai Journal of Stomatology    2019, 28 (5): 529-535.   DOI: 10.19439/j.sjos.2019.05.016 Abstract （1356）      PDF （5189KB）（220）       Knowledge map    PURPOSE: To investigate the effects of adenoid hypertrophy and maxillary sinus mucosal thickening on dentofacial development. METHODS: The selected subjects were divided into 4 groups according to the inclusion criteria: group A (adenoid hypertrophy with maxillary sinus mucosal thickening), group B (adenoid hypertrophy without maxillary sinus mucosal thickening), group C (normal adenoid with maxillary sinus mucosal thickening), and group D (normal adenoid without maxillary sinus mucosal thickening). There were 20 subjects in each group, aging from 12 to 14 years old. The volume of maxillary sinus was measured by Mimics software. The adenoid, dental arch width, basal bone width and palatal height were measured by Dolphin software and dentofacial measurements were performed in the lateral cephalograms derived from cone-beam CT (CBCT). The data were analyzed with SPSS 24.0 software package. RESULTS: There was no significant difference in dentofacial measurements between group B and group D or group C and group D,except for ANB angle (P<0.05). Compared with group D, SNB, ANB, Wits appraisal, NA-APo, MP-HP, N-Me, S-Go/N-Me, N-ANS (perp HP), sum of three angles, Ar-Go of group A were significantly different (P<0.05). Neither left nor right maxillary sinus bony volume had significant difference between group B and D or group C and D. CONCLUSIONS: Both adenoid hypertrophy and maxillary sinus mucosal thickening have impact on dentofacial development. Moderate or more severe adenoid hypertrophy with maxillary sinus mucosal thickening has greater impact on dentofacial development over adenoid hypertrophy or maxillary sinus mucosal thickening alone. Reference | Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 1-4.   Abstract （1289）      PDF （2466KB）（238）       Knowledge map    Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 0-封3.   Abstract （1253）      PDF （208KB）（138）       Knowledge map    Related Articles | Metrics

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Classification for mandibular deviation and facial asymmetry and its clinical significance SHEN Gang Shanghai Journal of Stomatology    2021, 30 (1): 1-6.   DOI: 10.19439/j.sjos.2021.01.001 Abstract （1253）      PDF （4956KB）（919）       Knowledge map    Judged from the clinical manifestations, etiological mechanisms and jaw morphological structures, malocclusions with mandibular deviation and facial asymmetry are classified into three main categories, i.e., those with mandibular positioning factors, those with mandibular condyle defects, and those with jaw congenital deformities. In the first category, three subtypes, including mandibular rotation caused by dentitional irregularities, by dental compensation and by habitual posturing, are further defined. In the second category, mandibular deviation caused by condylar asymmetrical resorption or hyperplasia are defined as the two subtypes. The third category is further divided into two subtypes, i.e., jaw and facial asymmetry resulting from maxillary or mandibular structural deformities. The prime goal of orthodontic therapy is to displace and restore the deviated mandible to its right position, followed by correction of occlusal intercuspation. As an important procedure of the whole treatment protocol, It is critical to detect and localize the correct mandibular position by manipulation and then register it by wax pattern and articulator transferring. For the cases with mandibular functional elements and condylar asymmetrical length, the treatment modalities include orthopedic repositioning of the mandible by using occlusal and bite plane, SGTB and SGHB therapies; for cases with growth and developmental anomalies, orthognathic intervention should be an optimal solution. Reference | Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 11-14.   Abstract （1237）      PDF （2558KB）（270）       Knowledge map    Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 5-7.   Abstract （1229）      PDF （2237KB）（236）       Knowledge map    Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 8-10.   Abstract （1211）      PDF （2187KB）（278）       Knowledge map    Related Articles | Metrics

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The effect of fluoride varnish Duraphat in preventing deciduous dental caries in preschool children SU Hong-ru, YANG Ren-ren, QIAN Wen-hao, YU Jin-ming Shanghai Journal of Stomatology    2019, 28 (1): 48-42.   DOI: 10.19439/j.sjos.2019.01.009 Abstract （1205）      PDF （3958KB）（303）       Knowledge map    PURPOSE: To evaluate the effect of fluoride varnish Duraphat on preventing caries of primary teeth caries, and provide scientific basis for the establishment of oral health care. METHODS: 1140 preschool children aged 3~4 years old were chosen from 25 public kindergartens in Xuhui district of Shanghai by cluster sampling method, they were divided into 2 groups on a voluntary basis with the informed consent of the child's parents. 762 preschool children in Fluoride Varnish group were taken oral examination and used fluoride varnishes every 6 months, 378 preschool children in the control group were without treatment. Oral health instruction was given to all the children. The data of caries prevalence, mean dmft, caries incidence and mean increments of dmft (decayed, missing and filled teeth) of 2 groups were compared. The results were analyzed using SAS 9.4 software package. RESULTS: After 2 years, caries prevalence, mean dmft, caries incidence and mean increments of dmft of fluoride varnish groups were lower than those of control group and the difference was statistically significant (P<; 0.05). CONCLUSIONS: Fluoride varnish Duraphat is effective in decreasing caries incidence and mean dmft increments of primary teeth in preschool children and is worthy to be used widely in Xuhui district. Reference | Related Articles | Metrics

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Evaluation of dental and craniofacial characteristics in patients with mild skeletal facial asymmetry SHEN Dan-yang, HU Li-hua, ZUO Si-hui, KANG Qi-chao, YAN Xiu-lin Shanghai Journal of Stomatology    2018, 27 (4): 376-381.   DOI: 10.19439/j.sjos.2018.04.008 Abstract （1194）      PDF （4190KB）（373）       Knowledge map    PURPOSE: The purpose of this study was to investigate the dental and craniofacial morphological characteristics in patients with mild skeletal facial asymmetry, and to investigate the relationship between mild skeletal facial asymmetry and dental anomalies. METHODS: Thirty patients with mild skeletal facial asymmetry (experimental group) and 30 patients with normal faces (control group) were selected. All patients were scanned by cone-beam computed tomography (CBCT) and X-ray machine, Winceph software was used to measure the posteroanterior cephalometric radiographs, NNT software was used to measure the CBCT data. The results were analyzed by Chi-square test, paired t test and independent sample t test using SPSS 19.0 software package. RESULTS: There were significant differences between the left and right sides of faces, teeth and alveolar bone of the first molar in the experimental group. The angle of mandibular dental midline and facial midline, the inclination of the frontal mandibular plane, the inclination of the first molar, the inclination of alveolar bone of the mandibular first molar, the width of alveolar bone of the mandibular first molar showed significant differences between the experimental group and the control group (P<0.05). There are some correlations among menton deviation, inclination of the first molar and alveolar bone of the first molar. CONCLUSIONS: Patients with mild skeletal facial asymmetry showed some specific skeletal and dental characteristics. There could be some correlations between these features. Reference | Related Articles | Metrics

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A five-year experience for treating patients with chronic apical periodontitis with root canal treatment: a retrospective cohort study JIA Ge, YU Miao, SHANG Xin-hua, WU Jian-hua, ZHAI Qin-kai Shanghai Journal of Stomatology    2021, 30 (2): 124-128.   DOI: 10.19439/j.sjos.2021.02.003 Abstract （1193）      PDF （4051KB）（451）       Knowledge map    PURPOSE: To investigate the clinical outcomes, including survival and periapical healing rates and failure causes, of root canal treatment for patients with periapical lesion. METHODS: A retrospective cohort study was conducted which enrolled patients admitted for the evaluation and management of periapical lesion with root canal treatment. The primary predictor variables were difficulty assessment of root canal therapy (DARCT),which was divided into lower（DARCT =3-4）, medium (DARCT =5-7) and higher (DARCT =8-9) difficulty root canal, in terms of canal length, curvature and calcification. The primary outcome measurement was the incidence of periapical healing and survival rate. Potential confounders included patient demographics, canal number, root canal filling, and coronal restoration. χ2 test and logistic regression analysis were used for statistical analysis with SPSS 21.0 software package. RESULTS: The 5-year survival rate was 81.4%(83/102) and healing rate was 77.1% (64/83). DARCT was significantly associated with the survival rate(P=0.017). Root fracture, deep pockets lesions and periodontal abscess were observed in DARCT with a value of 8-9(P=0.027), leading to tooth extraction. The teeth with multiple root canals were extracted due to recurrent or persistent periapical lesion (P=0.004). Chi-square test showed that root canal number (P=0.021), quality of root canal filling (P=0.006) as well as DARCT (P=0.000) were significantly correlated with the final healing rate. Multivariate logistic regression analysis showed that DARCT (P=0.000) and the quality of root canal filling (P=0.033) were associated with the final healing rate. CONCLUSIONS: DARCT and the quality of root canal filling play key roles in the clinical prognosis of periapical lesion, DARCT and number of root canal are more likely to be correlated with failure. Reference | Related Articles | Metrics

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Shanghai Journal of Stomatology    1992, 1 (1): 14-14.   Abstract （1192）      PDF （214KB）（132）       Knowledge map    Related Articles | Metrics

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Effects of mid-palatal suture opening and midfacial bony structure changes induced by maxillary skeletal expansion in adults CHUNG Miri, LYU Zheng-zhan, ZHU Bo-kai, WANG Xi-jun, QU Ran-yi, FAN Lin-feng, JIANG Ling-yong Shanghai Journal of Stomatology    2021, 30 (3): 316-322.   DOI: 10.19439/j.sjos.2021.03.019 Abstract （1140）      PDF （1144KB）（314）       Knowledge map    PURPOSE: To analyze the opening of mid-palatal suture, transverse changes in dental and dentoalveolar measurements and shift of midfacial bony structures induced by maxillary skeletal expansion (MSE) with cone-beam CT (CBCT), and to evaluate the effect of maxillary skeletal expansion and its influence on adjacent bony structures in adults. METHODS: The study sample consisted of 12 adult patients with maxillary transverse deficiency (4 males, 8 females) at a mean age of (21.17±4.13) years old. All patients were treated with MSE. After treatment, the posterior crossbite was corrected, and the width of the maxillary arch was achieved the optimal width. Pre- and post-treatment CBCT exams were taken before and after MSE treatment. Multiplanar coronal and axial slices obtained from CBCT images were used to measure the changes in transverse widths, angular changes and tooth inclination with Dolphin Imaging 11.9. SPSS 26.0 software package was used for statistical analysis. RESULTS: After MSE treatment, the anterior nasal spine width increased by (2.38±1.01) mm, posterior nasal spine width increased by (2.25±1.08) mm (P<0.01). The inter-crown and inter-apex distance at the first molar increased by (5.56±1.38) mm and (4.14±1.29) mm, respectively (P<0.01). No significant difference was seen in terms of tooth inclination of the first molar(P>0.05). Pterygoid process angle, pterygoid process width, anterior inter-maxillary distance, upper and lower inter-zygomatic distance were significantly larger after treatment (P<0.01), while the inter-temporal distance and bilateral zygomaticomaxillary angle remained unchanged(P>0.05). CONCLUSIONS: MSE has a favorable effect in adult patients with parallel skeletal expansion of the mid-palatal suture achieved after expansion. The teeth present with certain buccal inclination but show no significant movement relative to the alveolar bone. The midfacial bony structures also shift in three-dimensional under the effect of the expansion force. Reference | Related Articles | Metrics