Study on the interaction between the floor of maxillary sinus and maxillary first molar orthodontic movement
HU Hong-ying;YANG Yu-nan;WANG Yang;HE Shuang-shuang;WANG Hu;Deptartment of Oral Radiology,West China Hospital of Stomatology,Sichuan University,State Key Laboratory of Oral Diseases;
Objective: To investigate the interaction between the floor of maxillary sinus and maxillary first molar orthodontic movement. Methods: Orthodontic patients with at least one root of maxillary first molar protruding into the floor of maxillary sinus were selected by cone-beam computed tomography( CBCT). The movement distances of maxillary first molar roots during orthodontic treatment were measured. Besides,the effects of orthodontic tooth movement on the remodeling of maxillary sinus floor were also evaluated. Results: A total of 16 individuals( 28 maxillary first molar) were enrolled in present study. During orthodontic treatment,the mesiobuccal root,distal buccal root,and palatine root of the maxillary first molar were all moved remarkably. After orthodontic treatment,most of the patients had no obvious root absorption. In addition,the type II root,which has no cortical bone between the maxillary sinus floor and maxillary tooth roots,was increased in the mesial buccal root group after orthodontic treatment( P 0. 05). Conclusion: If proper orthodontic system was applied,moving maxillary first molar through the maxillary sinus is achievable with mere or no root resorption. However,tooth movement may cause bone resorption of the maxillary sinus floor,which should be of concern to orthodontists.
【CateGory Index】： R783.5