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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
    Abstract221)      PDF (759KB)(119)      
    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.
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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
    Abstract210)      PDF (870KB)(102)      
    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.
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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
    Abstract200)      PDF (524KB)(80)      
    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.
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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
    Abstract189)      PDF (1392KB)(110)      
    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.
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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
    Abstract181)      PDF (1849KB)(110)      
    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.
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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
    Abstract173)      PDF (456KB)(69)      
    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.
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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
    Abstract170)      PDF (680KB)(89)      
    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.
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    Three-dimensional gingival morphology in the aesthetic zone of maxillary anterior teeth: a cone-beam CT analysis
    WANG Wen-li, FU Ya-ting, LIU Hua, MA Xiao
    Shanghai Journal of Stomatology    2023, 32 (2): 177-182.   DOI: 10.19439/j.sjos.2023.02.012
    Abstract168)      PDF (822KB)(96)      
    PURPOSE: To measure and investigate the relationship of three-dimensional gingival morphology on the labial side of the maxillary anterior teeth by using cone-beam CT(CBCT) in conjunction with a novel radiocontrast agent. METHODS: Thirty periodontal healthy subjects were enrolled. The composition of light-cured gingival barrier resin and iohexol injection was applied to the measurement area, then a positioning wire was set up, and CBCT was used to assess supracrestal gingiva tissue (SGT), gingiva thickness (GT) and width of keratinized gingiva (KGW). The differences in each parameter between different gingival biotypes were compared. SPSS 25.0 software package was used for data analysis. RESULTS: The mean distance of SGT was greater for central incisors than canines (P<0.05). The central incisors had the thickest GT in the maxillary anterior region, while the canines had the thinnest(P<0.01). The GT of male central and lateral incisors was significantly thicker than that of females(P<0.05), and the KGW was significantly wider than that of canines (P<0.05). GT- SGT, KGW- SGT and GT- KGW all had a positive correlation (r=0.315, 0.287,0.406, P<0.01). The thick gingival type was greater than the thin gingival type in the KGW of lateral incisors and canines and the SGT height of canines (P<0.05). CONCLUSIONS: There were significant differences in the measuring results of GT, KGW, and SGT in the maxillary anterior region under different gingival biotypes, and individualized treatment strategies can be formulated based on gingival biotypes.
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    Evaluation of the effect of cattle calcined bone grafting material to repair alveolar bone defect after tooth extraction
    JU Jia, YANG Chi, WU He-ming, ZHAO Ji-hong, CHENG Li-fei, ZHANG Huan, FENG Bin, HU Kai-jin
    Shanghai Journal of Stomatology    2023, 32 (2): 198-202.   DOI: 10.19439/j.sjos.2023.02.016
    Abstract165)      PDF (629KB)(95)      
    PURPOSE: To verify the efficacy and safety of calcined cattle bone grafting material in filling alveolar bone defect after tooth extraction. METHODS: A randomized, bind, parallel, positive-control multicenter clinical trial was conducted. A total of 280 subjects were randomly assigned to either the experimental group (calcined cattle bone group) or control group (Bio-Oss group) equally. The main efficacy indicator was the imaging changes 24 weeks after material implantation. Secondary efficacy indicators were wound healing, rejection, bone metabolism, post-filling symptoms and signs of bone infection. The safety of material was assessed by the incidence of adverse events and serious adverse events. SAS 8.2 software package was used for statistical analysis. RESULTS: A total of 280 cases were included, of them 267 cases completed the study while 13 cases fell off. The effective rate of FAS(PPS) was 90.58%(97.46%) in the experimental group and 87.05% (95.04%) in the control group. The difference of effective rate between the experimental group and control group (95%CI) was 3.53% (-3.88%, 10.94%) of FAS, 2.42% (-2.38%, 7.22%) of PPS, and there was no significant difference between the two groups. The incision healing of the two groups was good, and the incidence of rejection, bone infection signs, post-filling symptoms and bone metabolic changes was very low. The incidence of adverse events was similar in the two groups, and no serious adverse events related to the study materials occurred. CONCLUSIONS: The efficacy of calcined cattle bone grafting material in filling alveolar bone defect after tooth extraction is not inferior to that of Bio-Oss, and it is safe and effective for alveolar bone defect repair.
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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
    Abstract162)      PDF (2656KB)(112)      
    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.
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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
    Abstract159)      PDF (657KB)(76)      
    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.
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    Evaluation of the efficacy of Nd:YAG laser in the treatment of 80 patients with oral mucosal venous malformation
    ZHAO Ning, SUN Li-ying, LI Yun-ling, MA Chuan, CAI Zhen, ZHU Chao
    Shanghai Journal of Stomatology    2023, 32 (2): 166-171.   DOI: 10.19439/j.sjos.2023.02.010
    Abstract158)      PDF (951KB)(106)      
    PURPOSE: To evaluate the efficacy of Nd:YAG laser treatment for venous malformations. METHODS: Eighty patients with oral mucosal venous malformations underwent one or more Nd:YAG laser treatments, and photographs of the lesions before and after laser treatment were collected and compared, patients' satisfaction were assessed using visual analog scale (VAS). SPSS 22.0 software package was used for data analysis. RESULTS: A total of 58 cases were cured in 80 patients, 21 cases showed remarkable improvement. Nine patients(11.25%) experienced adverse effects after laser therapy, including atrophic scars in 2 patients, oral mucosal ulcers in 4 patients, transient hyperpigmentation in 2 patients, and transient hypopigmentation in 1 patient, which met the expected response to effective therapy, and the follow-up results showed that most patients achieved maximum satisfaction values. CONCLUSIONS: Nd:YAG laser is an effective and safe treatment for oral mucosal venous malformation with definite efficacy and few side effects, which is worthy of popularization and application.
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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
    Abstract158)      PDF (801KB)(90)      
    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.
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    Regulation effect of serum IFN-γ and IL-4 expression on immune response in patients with oral lichen planus
    ZHAO Xiang, GE Hua-bing
    Shanghai Journal of Stomatology    2023, 32 (3): 271-275.   DOI: 10.19439/j.sjos.2023.03.010
    Abstract154)      PDF (555KB)(62)      
    PURPOSE: To investigate the regulation effect of interferon-γ (IFN-γ) and interleukin-4 (IL-4) in the serum of patients with oral lichen planus (OLP) on immune response. METHODS: A total of 83 OLP patients in Wangfujing Branch of Beijing Stomatological Hospital, Capital Medical University from January 2019 to December 2021 were selected as the experimental group, and another 61 healthy volunteers who came to the hospital during the same period were included as the control group. The expression levels of IFN-γ and IL-4 in the serum and the expression of immune function indexes of the two groups were compared. The relationship between the expression levels of IFN-γ, IL-4 and immune function indicators in the experimental group was analyzed. SPSS 22.0 software package was used to analyze the data. RESULTS: The levels of IFN-γ and IL-4 in the experimental group were significantly higher than those in the control group(P<0.05). There was no significant difference in the levels of IFN-γ between patients with reticulated OLP and erosive OLP in the experimental group (P>0.05). The level of IL-4 in patients with erosive OLP in the experimental group was significantly higher than that in patients with reticulated OLP(P<0.05). The levels of CD3+, CD4, CD16++CD56+ and CD4+/CD8+ in the experimental group were significantly lower than those in the control group(P<0.05), the levels of CD8+ and CD19+ in the experimental group were significantly higher than those in the control group(P<0.05). The levels of IgG, IgM and CH50 in the experimental group were significantly higher than those in the control group(P<0.05), and the levels of IgA, C3 and C4 in the experimental group were significantly lower than those in the control group(P<0.05). Pearson correlation analysis showed that the level of IFN-γ in the experimental group was negatively correlated with CD16++CD56+ and CD4+/CD8+ (P<0.05), the level of IL-4 in the experimental group was negatively correlated with CD16++CD56+ and CD4+/CD8+(P<0.05), and the level of IL-4 in the experimental group was positively correlated with IgG (P<0.05). CONCLUSIONS: Serum IFN-γ and IL-4 in OLP patients are abnormally high, and IL-4 expression is significantly higher in erosive OLP patients. The cellular and humoral immune functions of OLP patients are disordered and related to the regulation of CD16++CD56+, CD4+/CD8+, and IgG immune responses.
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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
    Abstract151)      PDF (867KB)(153)      
    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.
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    Osteotome sinus floor elevation with tapered implants: a short-term evaluation
    LU Yu-tung, SHI Jun-yu, LAI Hong-chang
    Shanghai Journal of Stomatology    2023, 32 (3): 302-307.   DOI: 10.19439/j.sjos.2023.03.016
    Abstract146)      PDF (738KB)(61)      
    PURPOSE: The aim of this study was to evaluate the short-term clinical outcome of tapered implants placed in posterior maxilla with osteotome sinus floor elevation (OSFE) technique. METHODS: The study population comprised 40 patients in whom 44 Astra tapered implants were inserted with OSFE technique from March to September in 2019. The surgical indication was that the bone height below the maxillary sinus was considered to be 2mm ~8mm. Astra tapered implants were inserted. Prosthetic restoration was completed 4 months after surgery. The implant success rate and stability, as well as osseointegration of the implant were clinically evaluated, and bone gain around the implants were measured. The data were analyzed using SPSS 19.0 software package. RESULTS: During the study period,the implant survival rate was 100%. The mean variation of implant stability quotient(ISQ) was 12.07±5.86. The mean value of ISQ ranged from 67.55±8.07 to 79.62±5.08. The average marginal bone loss was (0.32±0.29) mm. The endo-sinus bone gain(ESBG) was (1.06±0.4) mm. No mechanical complication was observed. The average probing depth around the implant was (3.2±1.51) mm, the bleeding on probing rate was(11.36±4.28)%, and the modified plaque index was 1.23±0.43. CONCLUSIONS: Astra tapered implants were found to produce predictable results in osteotome sinus floor elevation surgery. Further properly designed clinical trials are required to validate the use of tapered dental implants in sinus floor elevation technique.
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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
    Abstract141)      PDF (886KB)(79)      
    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.
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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
    Abstract140)      PDF (528KB)(100)      
    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.
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    Evaluation of red and white aesthetic effects of porcelain veneers in the restoration of developmental anterior dental gaps
    DENG Xiao-lin, YUAN Shuang, ZHU Dan-ting, SHI Le
    Shanghai Journal of Stomatology    2023, 32 (3): 276-279.   DOI: 10.19439/j.sjos.2023.03.011
    Abstract139)      PDF (873KB)(130)      
    PURPOSE: To evaluate the red and white aesthetic effect of porcelain veneer in the restoration of developmental anterior interdental spaces. METHODS: A total of 152 anterior teeth in 64 patients with developmental anterior dental gaps were restored using porcelain veneers, the aesthetic effects before and after restoration were evaluated by pink aesthetic index (PES) and white aesthetic index(WES), the aesthetic effect of gingival papilla filling and reconstruction was evaluated by interdental gingival papilla index (PIS), and visual analogue score (VAS) was used to compare the satisfaction of patients before and after restoration. SPSS 203.0 software package was used for statistical analysis. RESULTS: The overall mean scores of PES before and after restoration of 152 developmental anterior interdental teeth were 9.63±2.23 and 13.64±0.88, respectively. The average scores of WES before and after restoration were 6.85±1.87 and 9.81±0.58, respectively. There were significant differences of PES and WES scores before and after restoration(P<0.01). According to the requirements of "near" perfect restoration(PES≥13 points, WES≥9 points), the red and white aesthetic effect after restoration was near the standard. The scores of PIS before and after restoration were 1.86±0.67 and 2.97±0.18, the interdental gingival papilla was completely filled with space, and the shape was ideal, there were significant statistical differences before and after restoration(P<0.01). Patients were more satisfied with the smile curve and morphology of the restored anterior teeth than other parameters. CONCLUSIONS: The aesthetic effect of using porcelain veneers to repair developmental anterior interdental gaps is ideal, among which the filling of the papillae between the teeth can meet the expectations of patients, and the aesthetic effect evaluation of PIS and PES/WES applied to porcelain veneers to repair developmental anterior interdental spaces has practical guiding significance in clinical practice.
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    Analysis of clinical effects and risk factors of short implant followed up for 7-9 years
    YANG Jing-jing, MAO Wei-hua, YU Zheng-rong, WEI Hong-wu, GUO Shui-gen
    Shanghai Journal of Stomatology    2023, 32 (2): 214-219.   DOI: 10.19439/j.sjos.2023.02.019
    Abstract138)      PDF (976KB)(77)      
    PURPOSE: To evaluate the long-term clinical efficacy of short implants and analyze the influencing factors of the survival rate. METHODS: A total of 178 patients who received implant therapy in the Department of Stomatology, the Fourth Affiliated Hospital of Nanchang University from January 2010 to December 2014 were selected, including 334 short implants of Bicon (implant length ≤6 mm). The basic condition, restoration design, short implant survival rate and complications were observed and analyzed. SPSS 24.0 software package was used for data analysis. RESULTS: The average follow-up time of short implants was 96±17 months. During the observation period, 20 implants failed, 1 implant had mechanical complications and 6 implants had biological complications. Based on the analysis of implants and patients, the long-term cumulative survival rate of short implants was 94.0%(over 5 years survival rate was 96.4%) and 90.4% respectively. There was no significant difference between the survival rate of short implants and the patient's gender, age, whether to use special operation and the type of jaw teeth(P<0.05). Smoking and periodontitis were risk factors for failure of short implants(P<0.05).The difference of short implant survival rate between short implants restoration with combined crowns and single crowns was statistically significant(P<0.05). The survival rate of short implant in mandible was higher than that in maxilla(P<0.05). CONCLUSIONS: Under the standards clinical program and operation, short implant can be used to shorten the implant restoration cycle and avoid complicated bone augmentation which can achieve good long-term clinical effect. Short implant should be used to strictly control the risk factors that affect the survival of short implant.
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