Evaluation of Changes in TMJ Position for Angle Class I Malocclusion After Orthodontic Treatment by Using Cephalometric Radiograph

Abstract

Objective: A concern in fixed appliances orthodontic treatment besides reestablishing the normal occlusion characteristics might cause repositioning of the condyle position in TMJ region. The objective of this research is to find out whether there is a difference of TMJ position in Angle class I malocclusion type 1, 2, 3, 4, and 5 before and after fixed appliances orthodontic treatment. Methods:This research is a pre-and-post design study with analytical statistical approach which compared the TMJ position obtained from tracings 80 lateral cephalometric radiographs before and after fixed appliances orthodontic treatment. Purposive sampling technique was used to determine the sample size in Orthodontic Department of Rumah Sakit Gigi dan Mulut Universitas Padjadjaran from 2009-2015. The data was analyzed by using Kolmogorov-Smirnov Test and paired t-test.Results: This study revealed that the changes of condyle position in Condylion to Vertical T line (horizontally) after orthodontic treatment is not significant (P> 0.05) in Angle class I malocclusion. However, the difference of condyle position in Condylion to TC line (vertically) shows a significant difference (P< 0.05) in Angle class I malocclusion. Conclusion:The distance of the condyle from Condylion to TC line increased after fixed appliances orthodontic treatment for Angle class I malocclusion patients.

The Changes of Position and Angulation of Condyle Mandible Before and After Orthodontic Treatment in Class II Malocclusion by Using Cephalometric Radiograph

“…The linear measurements used to determine the position of the condyle on the cranial base are Condylion (Co) to the TC and Condylion (Co) lines to the Vertical T line (Vert-T). In this study compared any measurements of the sample groups before and after orthodontic treatment as shown in Figure 1 [1,6,7]. III.…”

“…DISCUSSION TMJ is considered one of the most complex joint in human body and has a strong relationship with dental occlusion and jaw relation. The position and function of the condyle is usually affected by age, facial growth patterns, pathological functional changes, decreased or increased muscle activity, occlusal force, and teeth occlusion [1]. Class II skeletal malocclusion can be treated in several ways based on characteristics according to the patient's condition such as anteroposterior discrepancy, age, cooperative patient.…”

“…Although statistical results suggest that the condyle moves anteriorly and inferiorly significantly, this fact may not affect TMJ clinical signs. Occlusion has been recognized as an important factor to cause TMD, however, to date; many scientific studies have shown that orthodontic treatment is not directly related to temporomandibular disorder (TMD) [1].…”

“…Malocclusions such as crossbite, occlusal interference, crowding, and tooth loss are considered factors for supporting the change of condyle position in temporomandibular joint [1].…”

<p>Gejala klinis dan faktor penyebab kelainan temporomandibular joint pada kelas I oklusi angle</p><p>Clinical symptoms and aetiological factors of temporomandibular joint abnormalities in class I angle occlusion</p>

“…Keadaan oklusi yang patologis ini akan memengaruhi posisi kondilus sehingga tidak lagi tepat pada sentral fossa mandibularis saat terjadi interkuspasi maksimum. 6,7 Kondisi edentulus gigi posterior juga akan memengaruhi perubahan pola oklusi normal karena gigi posterior berfungsi sebagai pusat pengunyahan, sehingga perubahan yang terjadi akan menyebabkan terputusnya integritas kesinambungan susunan gigi geligi. [8][9][10] Kebiasaan buruk seperti mengunyah satu sisi, bruksism, dan stres juga memungkinkan terjadinya kelainan TMJ.…”