Stress distribution produced by correction of the maxillary second molar in buccal crossbite.
The purpose of this study was to evaluate the stress distribution produced in the dentoalveolar system by a maxillary posterior crossbite appliance used for the correction of maxillary second molars in buccal crossbite. A photoelastic model was fabricated using a photoelastic material (PL-3) to simulate alveolar bone and ivory-colored resin teeth. The model was anteriorly and posteriorly observed with a circular polariscope and photographically recorded before and after activation of the maxillary posterior crossbite appliance. An uncontrolled palatal tipping and a rotating force were generated when the traction force was applied on the palatal surface of the maxillary second molar. A controlled tipping and an intrusive force were generated when the traction force was applied on the buccal surface of the maxillary second molar.
Yoon
Young-Jooh
YJ
College of Dentistry, Chosun University, Gwang-Ju, Korea. yjyun@mail.chosun.ac.kr
Jang
Sung-Ho
SH
Hwang
Gab-Woon
GW
Kim
Kwang-Won
KW
D000539:Alveolar Process / Q000503:physiopathology*; D006801:Humans; D008310:Malocclusion / Q000503:physiopathology / Q000628:therapy*; D008437:Maxilla / Q000503:physiopathology; D008953:Models, Anatomic; D008963:Molar / Q000503:physiopathology*; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D009969:Orthodontic Wires; D010159:Palate / Q000503:physiopathology; D010781:Photography; D010783:Photometry; D012399:Rotation; D013314:Stress, Mechanical; D019227:Tooth Apex / Q000503:physiopathology; D014087:Tooth Movement Techniques / Q000295:instrumentation; D014092:Tooth Root / Q000503:physiopathology