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Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective　To compare the clinical efficacy of invisible appliance and fixed appliance in the treatment of skeletal class I malocclusion. Methods A prospective cohort study with a minimum sample size of no less than 19 subjects in each group was used，and 46 adult patients with bone type I were eventually enrolled. According to the type of appliance，they were divided into the invisible appliance group（group A） with 25 patients and the fixed appliance group（ group B） with 21 patients. Data were analyzed before orthodontic treatment（ T0） after（T1） between invisible and traditional fixed orthodontics. Results　The static occlusion index and PAR score were improved after treatment，and the differences were statistically significant（P< 0.01）. The occlusal dynamic parameters including OT，OFAT，OFPT，AOF and DT were significantly improved after treatment（ P< 0.01） . There were significant differences in AOF，forward and lateral DT between the two groups（P< 0.01），the invisible group was better than the fixed group. Conclusion　Both the dynamic and static occlusal changes can be greatly improved with invisible and fixed appliance in the treatment of patients with class I malocclusion. Invisible appliance is better than fixed appliance in balancing occlusion，eliminating and reducing occlusal interference. [ABSTRACT FROM AUTHOR]

The goals of orthodontic treatment are balance, stability and aesthetics, an important physiological foundation for achieving the above goals is a good occlusal relationship, which includes static and dynamic occlusion. The evaluation of occlusal efficacy involves the static occlusal indicators such as overbite, overjet, midline and molar relationship at the intercuspal position (ICP), as well as the dynamic occlusion during the centric and non-centric excursions. The PAR index represents the degree of deviation from the ideal occlusion, and the occlusal alternations can be quantitatively evaluated by comparing the differences in PAR index before and after orthodontic treatment. The T-scan digital occlusal system can be used to evaluate the dynamic occlusion because of its characteristics of "force and time" correlation. In this paper, the advantages of PAR index combined with T-SCAN occlusal system in evaluating the occlusal efficacy of orthodontic treatment were reviewed. [ABSTRACT FROM AUTHOR]

Objective To comapre the clinical effect of invisible MA and double plate appliance in the treatment of children with early skeletal Class II mandibular retrusion malocclusion. Methods We selected 30 children with skeletal Class II mandibular retrusion malocclusion, with an average age of 10.5 years, divided them into invisible MA appliance correction group (group A) and twin-block correction group (group B), 15 cases in each group. The changes of jaw and teeth before (T0) and after (T1) treatment were measured and analyzed. Results Bone indexes：after treatment, there were statistically significant increases in SNB Angle, decrease in ANB Angle, decrease in Wits value, and increase in Pg/OLP of mandibular position in both groups (P < 0.05), while there was no statistically significant difference between the two groups (P > 0.05). After correction, the anterior height ratio of s-Go/N-ME in both groups decreased, while the mandibular plane Angle SN/MP, the anterior lower height ratio and the anterior lower height ratio of ANS/N-ME in both groups increased (P < 0.05), and the differences between the two groups were statistically significant (P < 0.05). Dental properties: U1-SN of the upper incisor decreased, l1-MP of the lower incisor increased, coverage improved, and molar relationship improved after treatment in both groups, all of which were statistically significant (P < 0.05). Only l1-MP Angle was significantly different between the two groups (P < 0.05). Pancherz analysis was used to conclude that the bone effect of group A was greater than that of group B. Conclusions The two kinds of orthodontics can effectively promote the development of mandible and improve the intersagittal deformity of mandible. After the orthodontics, the mandible will rotate clockwise, but the invisible orthodontics rotate less than the double plate orthodontics. The invisible orthodontic device MA can control the axial inclination of the anterior teeth better, and the loss of the anterior anchorage is less, so the orthodontic treatment can obtain better bone effect. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)