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[Treatment effects of magnetic Twin-block appliance for class II cases].

Abstract

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.

Authors+Show Affiliations

Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

English Abstract
Journal Article
Research Support, Non-U.S. Gov't

Language

chi

PubMed ID

18070424

Citation

Wu, Jian-Yong, et al. "[Treatment Effects of Magnetic Twin-block Appliance for Class II Cases]." Zhonghua Kou Qiang Yi Xue Za Zhi = Zhonghua Kouqiang Yixue Zazhi = Chinese Journal of Stomatology, vol. 42, no. 9, 2007, pp. 519-24.
Wu JY, Liu J, Li QS, et al. [Treatment effects of magnetic Twin-block appliance for class II cases]. Zhonghua Kou Qiang Yi Xue Za Zhi. 2007;42(9):519-24.
Wu, J. Y., Liu, J., Li, Q. S., Xu, T. M., & Lin, J. X. (2007). [Treatment effects of magnetic Twin-block appliance for class II cases]. Zhonghua Kou Qiang Yi Xue Za Zhi = Zhonghua Kouqiang Yixue Zazhi = Chinese Journal of Stomatology, 42(9), pp. 519-24.
Wu JY, et al. [Treatment Effects of Magnetic Twin-block Appliance for Class II Cases]. Zhonghua Kou Qiang Yi Xue Za Zhi. 2007;42(9):519-24. PubMed PMID: 18070424.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Treatment effects of magnetic Twin-block appliance for class II cases]. AU - Wu,Jian-Yong, AU - Liu,Jian, AU - Li,Qi-Shun, AU - Xu,Tian-Min, AU - Lin,Jiu-Xiang, PY - 2007/12/12/pubmed PY - 2010/8/6/medline PY - 2007/12/12/entrez SP - 519 EP - 24 JF - Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology JO - Zhonghua Kou Qiang Yi Xue Za Zhi VL - 42 IS - 9 N2 - 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. SN - 1002-0098 UR - https://www.unboundmedicine.com/medline/citation/18070424/[Treatment_effects_of_magnetic_Twin_block_appliance_for_class_II_cases]_ L2 - http://journal.yiigle.com/LinkIn.do?linkin_type=pubmed&issn=1002-0098&year=2007&vol=42&issue=9&fpage=519 DB - PRIME DP - Unbound Medicine ER -