[Treatment effects of magnetic Twin-block appliance for class II cases].
OBJECTIVE
To evaluate the effects of magnetic Twin-block appliance in the treatment of skeletal class II cases.


METHODS
The magnetic Twin-block appliance was embedded with two pairs of neodymium-iron-boron (Nd(2)Fe(14)B) rare earth permanent magnets in the upper and lower inclined planes of Twin-block appliance. The sample comprised of 13 skeletal class II patients in the late mixed or early permanent dentition treated by magnetic Twin-block appliance. Cephalometric films were taken before and after treatment. Helix CT images of the temporomandibular joint (TMJ) in all patients were examined before treatment (T1), during treatment (4 months after appliance placement, T2), after treatment (T3) and one year after treatment (T4).


RESULTS
A double contour image was detected in the superior posterior part of the condylar head on the pseudo-sagittal reconstruction plane pictures of T2 in 11 patients. The double contour image could be observed in most patients as well. This image also exhibited on the pictures of T3 in several patients. On the pictures of T2 and T3 in some patients, interruption of cortical bone and "bifurcation phenomenon" of condyles were shown. Pictures of T1 and T4 were similar and no signs of remodeling of TMJ were observed. Cephalometric analysis revealed significant changes in the maxillofacial structure after treatment. The profile of patients improved.


CONCLUSIONS
Bone remodeling of condyle occurred during the magnetic Twin-block treatment in class II patients. Magnetic Twin-block appliance was effective in the treatment of the growing skeletal class II patients.
Wu
Jian-Yong
JY
Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Liu
Jian
J
Li
Qi-Shun
QS
Xu
Tian-Min
TM
Lin
Jiu-Xiang
JX
D000293:Adolescent; D016723:Bone Remodeling; D002648:Child; D005260:Female; D006801:Humans; D008280:Magnetics; D008297:Male; D008312:Malocclusion, Angle Class II / Q000503:physiopathology / Q000628:therapy*; D008335:Mandibular Condyle / Q000503:physiopathology; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective / Q000295:instrumentation; D016896:Treatment Outcome