Method:A maxillary edentulous jaw was restored by four-implants-supported fixed bridge and extracoronal resilient attachment denture.

Objective: To develop the stress distribution variation when restore maxillary edentulous jaw with different cantilever arm length and implant place, to get a better design proposal.

ObjectiverTo develop a new method to restore maxillary edentulous jaw with front fixed bridge supported by implants and back attachment denture and choose a more reasonable design by comparing stresses of two kinds of attenchments(rigid and resilient) and different implant number and place.

Palatally impacted maxillary canine is common in clinic which affects the function and aesthetic of maxillary teeth.

Objective To analysize the etiology, clinical examination, suitable diagnosis and treatment of impacted maxillary canines.

Maxillary canine impaction is a common problem in orthodontics, and is considered to be the most complex domain in orthodontics because of the uncertainty of its etiology and prognosis and the diversity of the treatment options.

Objective To investigate root canal curvature in maxillary anterior teeth.

A vitro study on the type of the mesiobuccal root canal of the maxillary molars and its clinical significance;

AIM:To investigate the transverse configurations of mesiobuccal root canals of the maxillary first and second molars in Chinese population using the serial root sections technique,and provide theoretical and experimental evidence for clinical management of mesiobuccal root canals and increase the success rate of root canal therapy in maxillary molars.