[Evaluation of condylar asymmetry in different skeletal patterns with cone-beam CT].

Purpose: The aim of this study was to evaluate condylar asymmetry in different skeletal patterns with cone-beam CT (CBCT).

Methods: A total of 110 subjects aged from 18 to 30 years were selected from patients who had undergone CBCT examinations retrospectively. All the subjects were divided into three groups according to their skeletal patterns: Class Ⅰ (Cl Ⅰ: 0°≤ANB≤5°), Class Ⅱ (Cl Ⅱ: ANB>5°) and Class Ⅲ (Cl Ⅲ: ANB<0°).

[Clinical aesthetic effectiveness of restoring the subgingival residual crowns of anterior teeth with crown lengthening surgery].

Purpose: To evaluate the clinical effects of restoring the subgingival residual crowns of anterior teeth with periodontal and prosthodontics treatment.

Methods: Twenty-five patients with 28 subgingival residual crowns were treated by root canal therapy, crown lengthening surgery, and restored with post- core crown after 8 weeks. Changes in tooth mobility, gingival health were examined and clinical effect of crown restoration were evaluated at regular intervals of 1 month, 6 months and 12 months after restoration respectively.

[Clinical efficacy of Nd:YAG laser combined with Vitapex paste in the treatment of periapical cysts around single root].

Purpose: To explore the clinical efficacy of Nd:YAG laser combined with Vitapex paste in the treatment of periapical cysts around single root.

Methods: Thirty-four teeth with periapical cysts in 34 patients were treated from August 2014 to August 2016 in Taizhou People's Hospital using Nd: YAG laser, Vitapex paste was injected into the small periapical cysts, followed by conventional root canal filling. The clinical efficacy was observed every 3 months after surgery, the follow period was from 10 months to 2 years.

[An epidemiological investigation of caries status of the first permanent molars of children aged 7-9 year in Taizhou City].

Purpose: To investigate caries prevalence of the first permanent molars of children aged 7-9 years in Taizhou city.

Methods: According to caries diagnostic criteria of WHO, 3653 primary school students in downtown areas of Taizhou city were surveyed; the data were statistically analyzed with SPSS 20.0 software package.

[Investigation of malocclusion and orthodontic treatment proportion of middle school students in Hailing district, Taizhou city].

Purpose: To investigate the prevalence of malocclusion and orthodontic treatment proportion of middle school students in Hailing district, Taizhou city.

Methods: Standard investigation form was made based on the individual normal occlusion and Angle's classification of malocclusion. 9018 middle school students were investigated.