Construction of three-dimensional finite element models including TMJ,maxilla,mandible and dentition with MBT straight wire appliance;

Construction of three-dimensional finite element models of maxillary dentition and MBT straight wire appliance;

Observation and analysis of Class Ⅱ division 1 malocclusion with openbite treated by MBT straight wire appliance

Treat deep overbite with straight wire appliance combined with bite plate;

Objective To investigate morphologic changes of Angle class Ⅱ and skeletal class Ⅰ patients during pendulum and straight wire appliances treatment and to analyze the mechanism of this treatment protocol.

Methods:Collecting thirty patient who using controlling root auxiliary arch when anaphase of deploying straight wire appliance,explaining in full clinical steps and bending methods of the auxiliary arch,attaching case reports.

Changes of hard tissues of the Herbst appliance and Edgewise appliance two-phase treatment of class Ⅱ,division 2 Malocclusions;

The clinical effect of edgewise appliance applied in replanted teeth;

Methods The characteristics of soft and hard tissues of 15 patients were analyzed by studying lateral cephalometric radiographs and plaster model,then the mechanism of malocclusion was probed and the scheme of treatment was formulated,the malocclusion was treated by edgewise appliance after extracting bilateral maxil.

[Objective] To evaluate the effect of Begg lingh wire appliance on Angle class Ⅱ division 1 malocclusion, and to observe the changes of incisor protrusion and deep overbite and relation of molar after treatment at the end of stage I.