Three-dimensional changes in the temporomandibular joint after maxillary protraction in children with skeletal Class III malocclusion

We evaluated 3-dimensional changes in the temporomandibular joints of children with skeletal Class III malocclusion and maxillary deficiency after facemask therapy for maxillary protraction. Eighteen children with anterior crossbite and a Class III molar relationship underwent facemask therapy for m...

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Bibliographic Details
Published in:Journal of Oral Science 2016, Vol.58(4), pp.501-508
Main Authors: Lee, Hyunju, Son, Woo-Sung, Kwak, Chun, Kang, Eun-Hee, Kim, Seong-Sik, Park, Soo-Byung, Kim, Yong-Il
Format: Article
Language:English
Subjects:
3D cephalometry
CBCT
Child
Cone-Beam Computed Tomography
Dentistry
facemask
Female
Humans
Male
Malocclusion, Angle Class III - diagnostic imaging
Maxilla
Observer Variation
Temporomandibular Joint - diagnostic imaging
TMJ
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Summary:We evaluated 3-dimensional changes in the temporomandibular joints of children with skeletal Class III malocclusion and maxillary deficiency after facemask therapy for maxillary protraction. Eighteen children with anterior crossbite and a Class III molar relationship underwent facemask therapy for maxillary protraction, after which they exhibited positive overjet and a Class II molar relationship. Three-dimensional cone-beam computed tomography images of the patients were obtained before (T1) and after (T2) facemask protraction, and the 3-dimensional coordinates of the anatomical landmarks in T1 and T2 images were compared. After facemask therapy, the mandibular condyles of the patients were displaced outside, upward, and backward. Additionally, the anterior and posterior walls of the glenoid fossa had negative values for anteroposterior change. Three-dimensional analysis of the temporomandibular joint showed that facemask therapy resulted in bone apposition (to the anterior wall) and bone resorption (of the posterior wall) in the glenoid fossa. This bone remodeling resulted in upward and backward displacement of the condyle.(J Oral Sci 58, 501-508, 2016)
ISSN:1343-4934
1880-4926
DOI:10.2334/josnusd.16-0251