Download COMPARATIVE STUDY OF THE TEMPOROMANDIBULAR JOINT

COMPARATIVE
STUDY
OF
THE
TEMPOROMANDIBULAR
MORPHOLOGY IN PATIENTS WITH SKELETAL CLASSES II AND III
JOINT
Introduction: The temporomandibular joint (TMJ) plays a fundamental role in the
stomatognathic system, this is why the diagnostic imaging is an important
complement to its study. Currently, Computed Tomography Cone Beam (CTCB),
has proved to be useful in evaluating its bone components.
Objectives: To compare with CTCB the TMJ´s morphology in patients with skeletal
classes II and III.
Materials and Methods: 37 CTCB (74 condyles) were evaluated from patients
treated in the Institute of Surgery, Orthodontics and Rehabilitation (ICOR),
Santiago, Chile; the exams were taken in a Planmeca ProMax 3D Max machine with
a 26x23 cm window and 0.6 milimiters voxel. 24 patients were class III and 13 class
II patients. The condylar shape was evaluated in frontal and sagittal planes, condylar
measures were taken on three planes and measures of the articular eminence in
sagittal plane. Later it was determined the distribution of variables and T tests were
applied to compare right and left sides and between skeletal classes.
Results: No significant differences were found between right and left joint
measures in both classes II and III. In both skeletal classes the predominantly shape
in the frontal plane was convex and in the sagittal plane was the anterior concavity.
Significant differences (P <0.05) were found in the condylar position respect to the
axial plane in class II and class III patients. Significant differences were found in the
right condylar medullary tissue density and in the angle of the left eminence between
class II and class III patients.
Conclusions: Differences were observed in joint morphology (condyle and
eminence) in TMJ of classes II and III patients receiving orthodontic treatment and
with undergoing orthognathic surgery.
Keywords: temporomandibular
morphology, skeletal classes.
joint,
cone
beam
computed
tomography,