[Comparative study on bilateral temporomandibular joint of patients with unilateral multiple symptoms in cone-beam computed tomography].

Purpose: To investigate bilateral temporomandibular joint of patients with unilateral multiple symptoms in cone-beam computed tomography (CBCT) and explore the reference planes that may be different,providing reference for the diagnosis of temporomandibular disorders and comparative study.

Methods: 50 cases with unilateral multiple symptoms（except for cases with unilateral single symptom）were examined by CBCT and the following indexes were observed and analyzed,including horizontal angles of the cross-sectional condyle after the reconstruction in the same patient, joint space, macroaxis diameter of condyle and vertical angles of condyle, which were commonly used at oblique position parallelled to the long axis of condyle, the gradient of articular tubercle and the joint space,which could be obtained at sagittal and oblique position vertical to the long axis of condyle.The data obtained was analyzed by paired t test with SPSS13.

Measurement of cortical bone thickness in adults by cone-beam computerized tomography for orthodontic miniscrews placement.

The purpose of this study was to investigate the cortical bone thickness of the inter-dental area of both jaws for orthodontic miniscrew placement. The cone-beam computerized tomography images of 32 non-orthodontic adults with normal occlusion were taken to measure the cortical bone thickness in both jaws. One-way analysis of variance (ANOVA) was used to analyze the differences in cortical bone thickness.

[Study of radiographic method of increasing vertical angle for identifying double root in maxillary premolar with cone-beam CT].

Purpose: To explore the feasibility of radiography method of increasing vertical angle for identifying double root in maxillary premolar with cone-beam computed tomography(CBCT).

Methods: Thirty-one patients with 109 maxillary premolars who needed CT scan for maxillary teeth were selected and scanned by CBCT. The interested region was chosen to reconstruct the image of maxillary premolar at axial, coronal and sagittal section.

[Evaluation of palatal bone thickness in adults with normal occlusion for orthodontic miniscrews placement].

Objective: To investigate the palatal bone thickness in adult with normal occlusion.

Methods: The cone beam computerized tomography records of 32 adults with normal occlusion (16 males and 16 females), mean age (30.1 ± 6.

[Effect of right chewing-side preference on morphological temporomandibular joint changes].

Purpose: To explore the effect of right chewing-side preference on temporomandibular joint with cone-beam computed tomography (CBCT).

Methods: Fifty-two patients who were diagnosed as right chewing-side preference were selected and scanned by CBCT in the intercuspal position. The interested region was chosen to reconstruct and the images of bony structure of TMJ at axial view, coronal position, sagittal position, oblique position parallelled to the long axis of condyle and oblique position vertical to the long axis of condyle were evaluated.