Title: Factors Associated With TMJ Condylar Bone Mineral Density
Syrus Haghighi (Presenter)
Ohio State University
Mary Griffith, Ohio State University
Victoria Hutta, Ohio State University
Do-Gyoon Kim, Ohio State University
Objectives: Temporomandibular disorder (TMD) is a complex and multifactorial disease. It has been observed that female has more risk of TMD compared to male. The objective of this study was to investigate sex dependent correlations of human mandibular condylar bone mineral density (BMD) with skeletal classification and dentition.
Methods: Following IRB approval, retrospective analysis was performed using cone beam computed tomography (CBCT) images taken from 28 male (7-69 years old) and 36 female (13-81 years old) patients. The number of teeth was counted for each patient. Right and left mandibular condyles were digitally dissected and their CT gray values were used to estimate BMD. 2D lateral cephalograms were obtained by converting the 3D CBCT images using imaging software (Dolphin 3D). The skeletal classification was identified to Class I, II, III. Two-way analysis of variance was tested to compare the BMD, dentition, and skeletal classification for male and female groups (significance, p<0.05).
Results: The BMD was significantly higher for left than right mandibular condyle (p<0.001) independent of sex. The BMD was significantly higher for both right and left mandibular condyles of the female group than those of the males group (p<0.01). The number of teeth had significant positive correlations with the BMD of the female group (p<0.007) but not with those of the male group (p>0.088). The correlation for left mandibular condyle of the female group was significantly dependent on the skeletal classification (p=0.021).
Conclusions: The current findings indicate that the temporomandibular joint (TMJ) condyle bone characteristics of the female group can be more altered by relations between upper and lower jaws and dentition than the male group.