[Condylar position and condylar symmetry in patients with temporomandibular disorders].

Purpose: To investigate condylar position and condylar symmetry in patients with temporomandibular disorders (TMD) as well as malocclusion.

Methods: Fifteen patients with TMD and malocclusion were selected for the experiment, 15 asymptomatic patients served as controls. The bilateral temporomandibular joints of all subjects were evaluated by computed tomography (CT) imaging.

[3-D finite element analysis on center of resistance of upper anterior teeth].

Purpose: To investigate the location of center of resistance(CRe) of six upper anterior teeth.

Methods: A three-dimensional finite element model of premaxillary bone and anterior teeth was established in ANSYS 8.1 software.

[Investigation of the possible factors related to root resorption during orthodontic treatment in adolescents].

Purpose: The purpose of this study was to investigate the factors relating to root resorption after orthodontic treatment in teenage patients.

Methods: seventy eight teenage patients treated with fixed orthodontic appliances were selected for this study. Root resorption scores of the upper incisors were recorded qualitatively according to their apical root morphology in the panoramic radiographs before and after treatment.

[The study on characteristics of soft tissue profile for different malocclusion].

Objective: To study the coordination of facial soft tissue in Angle's Class I, II1, III malocclusion, providing reference for the clinical practice.

Methods: 60 lateral cephalometric radiographs of three classes of Angle's malocclusion were included. 13 measurements were analyzed by SPSS 10.