[Effect of varying lingual traction forces on the space-closing speed in a typodont model].

Objective: To investigate the influences of varying lingual traction forces on the space-closing speed in a typodont model.

Methods: Forty-two Angle Class I standard typodont models of bimaxillary teeth protrusion were divided into 7 equal groups. Four regions of the model were paired to groups, and in the odd-numbered models, the top left and bottom left regions served as the experimental group and the top right and bottom right regions as the control group; in the even-numbered models, the regions in the model were grouped oppositely.

[Clinical observation of improved titanium miniplate internal fixation for mandibular fracture].

Purpose: To evaluate the curative effect of titanium compression miniplate internal fixation and craniomaxillary elastic traction in single mandibular fracture.

Methods: 112 patients were treated by two methods respectively: improved titanium miniplate internal fixation and traditional titanium miniplate internal fixation,with 56 cases in each group. The curative effect was evaluated.