IADR Abstract Archives
Female Mandibular Condyle Bone Mineral Density is Related to Dentition
Objectives: Temporomandibular disorder (TMD) is a multifactorial disease that is more prevalent in women than in men. Thus, the objective of this study was to investigate whether human condylar bone mineral density (BMD) is associated with dentition and skeletal profile dependent on sex.
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: Male group had significantly lower BMD for both left and right condyles than female group (p<0.01). The left condylar BMD was significantly higher (p<0.001) independent of sex. Significant positive correlations were found between the number of teeth and the BMD of both right and left mandibular condyles for the female group (p<0.007) but not for the male group (p>0.088). The left condylar BMD of the female group in Class I and II were significantly dependent on the dentition (p<0.05).
Conclusions: The current results suggest that the temporomandibular joint (TMJ) condyle bone density of the female group can be influenced more by occlusion and skeletal relationship than the male group.
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: Male group had significantly lower BMD for both left and right condyles than female group (p<0.01). The left condylar BMD was significantly higher (p<0.001) independent of sex. Significant positive correlations were found between the number of teeth and the BMD of both right and left mandibular condyles for the female group (p<0.007) but not for the male group (p>0.088). The left condylar BMD of the female group in Class I and II were significantly dependent on the dentition (p<0.05).
Conclusions: The current results suggest that the temporomandibular joint (TMJ) condyle bone density of the female group can be influenced more by occlusion and skeletal relationship than the male group.