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To investigate the correlation of gene polymorphisms of interleukin-23 receptor (IL-23R) rs11465817 and rs10489629 loci to susceptibility and clinical efficacy of recurrent oral ulcer (ROU).<br /><br /> A total of 150 ROU patients, who visited Stomatological Department of our hospital from January 2016 to December 2018, were selected as ROU group. A total of 150 healthy subjects who underwent physical examination at the same time in our hospital, were selected as healthy control group. Blood DNA was extracted from all subjects and amplified by polymerase chain reaction (PCR) at sites of IL-23R rs11465817 and rs10489629 loci. The genotyping was determined by electrophoresis after enzymatic digestion of amplified products. Patients with ROU were treated with oral levamisole, vitamin C, vitamin B2 and cetylpyridnium chloride gargle. Ulcer area and pain index were used to evaluate the clinical efficacy before and in the first week after treatment. Correlation on gene polymorphisms of interleukin-23 receptor (IL-23R) rs11ype was significantly lower than that in patients with IL-23R rs11465817 loci of CC or CA genotype (P&lt;0.05). Ulcer area and VAS score in patients with IL-23R rs10489629 locus of each genotype was not significantly different (P&gt;0.05).<br /><br /> Polymorphism of IL-23R rs11465817 loci is probably related to susceptibility and clinical efficacy of ROU, while polymorphism of IL-23R rs 10489629 is not probably related to susceptibility and clinical efficacy of ROU. The results of this study need to be further validated by a clinical study with large sample size.<br /><br />Polymorphism of IL-23R rs11465817 loci is probably related to susceptibility and clinical efficacy of ROU, while polymorphism of IL-23R rs 10489629 is not probably related to susceptibility and clinical efficacy of ROU. The results of this study need to be further validated by a clinical study with large sample size.<br /><br /> To investigate the effect of Bio-Oss bone powder combined with Heal-All Oral repair membrane and Bio-Oss collagen on site preservation during implantology.<br /><br /> A total of 26 cases were randomly divided into 2 groups. In Bio-Oss bone powder group (13 cases), the sockets were filled with Bio-Oss bone powder, covering with Heal-All Oral repair membrane on the surface. In Bio-Oss collagen group (13 cases), the sockets were filled with Bio-Oss collagen only. The changes in alveolar bone density，height，width and new bone contour were evaluated with cone-beam CT(CBCT) after site preservation. The data were analyzed with SPSS 17.0 software package.<br /><br /> There was no significant difference in new bone contour between 2 groups(P&gt;0.05). The changes in height, width and grey level of alveolar bone between the two groups were significantly different after 3 months of follow-up(P&lt;0.01), but the curative effect was similar(P&gt;0.05).<br /><br /> There is no significant difference in the efficacy of site preservation between the two materials. However, the site preservation technique using collagen is simple, less invasive and less costly.<br /><br />There is no significant difference in the efficacy of site preservation between the two materials. However, the site preservation technique using collagen is simple, less invasive and less costly.<br /><br /> To investigate the effect of invisalign on anterior and posterior upper airway and maxillary bone changes in the treatment of high-angle skeletal Class II malocclusion.<br /><br /> Thirty-seven patients with malocclusion undergoing invisible orthodontic treatment in Hospital of Stomatology of Xi'an Jiaotong University from June 2016 to June 2018 were enrolled. Before and 18 months after correction, the correction effect was evaluated. Cone-beam CT (CBCT) was performed to measure the upper airway volume and tongue position. Cephalometric examination was performed to determine the anteroposterious diameter of the upper airway and the position of hyoid bone. The pre-therapy and post-treatment facial profile images of patients and stars were graded by 0-10 numerical rating scale. SPSS 20.0 software package was used to analyze the data.<br /><br /> After correction, oropharyngeal volume, glossopharyngeal volume and minimum cross-sectional area of upper airway significantly increased(P&lt;0.05). [https://www.selleckchem.com/peptide/gsmtx4.html GsMTx4] Sagittal diameter of the upper airway at mandibular plane significantly increased after correction (P&lt;0.05). After correction, ANB angle, GoGn-SN angle, OPP-SN angle, Y-axis angle, UI-SN angle, UI-PP angle, UI-AP angle, and UI-AP distance significantly decreased, SNB angle and UI- LI angle significantly increased(P&lt;0.05). The aesthetics scores of facial profile images significantly increased after correlation(P&lt;0.05), which was significantly lower than that of the stars(P&lt;0.05).<br /><br /> Invisalign can effectively correct open upper airway and malocclusion, achieving better treatment results and satisfactory facial aesthetics effect.<br /><br />Invisalign can effectively correct open upper airway and malocclusion, achieving better treatment results and satisfactory facial aesthetics effect.<br /><br /> To establish a prospective cohort of kindergarten children and longitudinally study the causes of early childhood caries.<br /><br /> Cluster random sampling was used to select a kindergarten in the urban and suburban areas of Pudong New District of Shanghai, a total of 240 small-class children joined the study. Chi-square test, analysis of variance, binomial logistic regression model and general linear regression model was used to analyze caries of the cohort children at baseline and 1 year after follow-up with SPSS 21.0 software package.<br /><br /> In the first two years of this cohort study, the follow-up rate was 88.3%, the caries rate in the first year of baseline and follow-up were 58.3% and 69.8%, and the mean dmft values were 3.1±4.2 and 4.5±4.9, respectively. 56.1% of children had new caries. Logistic regression results showed that children who lived in the suburbs (P=0.010) and ate candy more frequently (P=0.036) had higher rates of new caries. The results of general linear regression equation showed that children in the suburbs (P&lt;0.001), those who did not use fluoridated toothpaste (P=0.003) and those who ate candy more frequently (P=0.002) had higher new mean dmft values.<br /><br /> Living in the suburbs, not using fluoride toothpaste and eating candy more frequently are important risk factors for new caries in preschool children in Pudong New District of Shanghai.<br /><br />Living in the suburbs, not using fluoride toothpaste and eating candy more frequently are important risk factors for new caries in preschool children in Pudong New District of Shanghai.