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

Abstract

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)

Effect of protraction facemask on the temporomandibular joint: a systematic review

“…According to the GRADE quality analysis, the three RCTs [ 26 , 46 , 49 , 56 ] were graded as high value of evidence, seven studies [ 47 , 48 , 50 – 53 , 55 , 59 ] were graded as moderate value of evidence, and three studies [ 54 , 57 , 58 ] were graded as low value of evidence.…”

“…3 ). All the before-after studies [ 54 , 57 , 58 ] with no control group showed no description of the derivation of the control group, and lost comparability of participants between treatment and control groups (Fig. 2 ).…”

“…The last study by Lee et al [ 54 ] focused on the bone absorption of mandible with CBCT outcomes. In this before-after study, three of eight items showed low risk of bias and four items showed high risk (Fig.…”

“…The before-after study by Lee et al [ 54 ] measured displacement of condyle by means of CBCT, and condyle showed displacement to the outside, backward, and upward in treatment group ( p < 0.05). Meanwhile, coronoid process and ramus showed displacement to the outside ( p < 0.05).…”

Avaliação do desempenho mastigatório, força oclusal e mobilidade mandibular em crianças com e sem necessidade de tratamento ortodôntico

“…Crianças com dentes desalinhados podem necessitar de tratamento ortodôntico para melhorar a função, estética e saúde bucal (de Sousa et al, 2016). A maloclusão significa o desvio da oclusão normal dos dentes, caracterizada por padrões neuromusculares atípicos originados por hábitos deletérios, alterando a posição dos dentes e promovendo alterações no sistema estomatognático (Lee et al, 2016;Masood et al, 2017;Moreau et al, 2017).…”