Interactions between Orthodontic Treatment and Gingival Tissue.

In recent years, as the number of adults seeking orthodontic treatment has increased, so too has the number of periodontal tissue problems, particularly regarding the impact on periodontal tissue of receiving orthodontic treatment. Orthodontic treatment improves the occlusion and appearance of teeth by moving the teeth appropriately. These movements have a significant impact on the interactions between the teeth and periodontal tissues. Orthodontic treatment can also recover tooth alignment for patients with tooth displacement caused by periodontitis; however, orthodontic treatment also often has adverse effects on periodontal soft tissue, such as gingivitis, gingival enlargement and gingival recession. The purpose of this review is to summarise the current evidence and solid knowledge of periodontal soft tissue problems in orthodontic treatment and outline some prevention strategies.

[Measurement of anterior teeth widths in 236 Uygur teenagers].

PURPOSE: In order to provide reference for orthodontic and esthetic dentistry, we measured anterior teeth widths, and analyzed the ratio between the teeth in 236 Uygur teenagers. METHODS: Two hundred and thirty-six samples were selected from Uygur population,Vernier calipers was used to measure the widths of the anterior teeth. SPSS21.0 software package was used for independent sample t test, paired t test and REG regression. RESULTS: Except for mandibular lateral incisors, significant difference was observed in anterior teeth widths between males and females, the ratio between the upper and lower central incisors in males was nearly 1.618; the ratio between upper central incisor and lower central incisor, upper central incisor and lower lateral incisor, upper canine and lower lateral incisor in females was not approaching 1.618, i.e. There was no "golden proportion". There was significant correlation between anterior teeth of Ugyur teenagers. CONCLUSIONS: No "golden proportion" was found in anterior teeth widths of Ugyur teenagers, but a specific ratio exists.

[Anatomy of temporomandibular joint and condyle position in Uygur adult patients evaluated with cone-beam CT].

PURPOSE: To compare the anatomy and condyle-fossa relationship difference between Uygur adult patients with Class I and Class II division 1 malocclusion by three dimensional cone-beam CT (CBCT). METHODS: Sixty-four patients with Class I and Class II division 1 malocclusion were selected, and the CBCT scans of their temporomandibular joints were taken.The difference of the condylar morphology and location between Class I and Class II division 1 patients was analyzed with SPSS 17.0 software package. RESULTS: The position of condyle in the TMJ fossa was not significantly different between the two groups; in Class II division 1 malocclusion group, the mandibular fossa depth, anterior joint space and the superior joint space were significantly bigger (P<0.05), but the posterior joint space was significantly smaller than those in Class I malocclusion group (P<0.05). CONCLUSIONS: There were difference in condyle position and TMJ morphology between Class I and Class II division 1 malocclusion group in Uygur adult patients.

[The prevalence of orthodontic treatment need in Urumqi Han's adolescent].

OBJECTIVE: To assess the severity of malocclusion and the need for orthodontic treatment in Urumqi Hans' adolescent. METHODS: 562 children aged from 11-19 years old were chosen randomly and were investigated. The severity of malocclusion and the need for orthodontic treatment were assessed using the Malocclusion Severity Index (MSI, Hill PA 1992). RESULTS: The MSI scores for this population were 21.91 +/- 17.09 in male and 22.28 +/- 17.26 in female, respectively, there were no significant differences between sexes (P > 0.05). According to the classifications of MSI scores, the rates of the need for orthodontic treatment were 54.55% in male and 55.40% in female. CONCLUSIONS: (1) The rates of orthodontic treatment need in Urumqi Hans' adolescent were highly frequent. (2) The MSI is a simple precise valid index for assessing the orthodontic Treatment Need. It is suggested to be used widely.