IADR Abstract Archives
Three-Dimensional Analysis of Positional and Morphological Asymmetries in Unilateral Crossbites: a Retrospective Study
Objectives: (1) Determine the connection between a unilateral crossbite condition (UCC) and TMJ changes regarding joint space availability, (2) Confirm the connection between UCC and TMJ changes regarding muscular activity, (3) Determine the condylar head volumetric impact by UCC, and (4) Control for gender and age to view the isolated impact of UCC on spatial, morphologic, and volumetric condylar changes.
Methods: 132 CBCT scans of UC and control patients were analyzed. Bilateral measurements were taken in Invivo5.0 of the condylar head and surrounding space in sagittal and coronal cross-sections; these measurements – sagittal anterior (SA), sagittal middle (SM), sagittal posterior (SP), coronal medial (CM), coronal middle (CMi), and coronal lateral (CL) – were then related to the control measurements. Bone density at a masseteric insertion site was analyzed in Invivo5.0 to compare muscular strength in UCC versus controls. Finally, a comparison of condylar volumes was completed in Dolphin Software.
Results: There was an asymmetric spatial availability between the crossbite and non-crossbite sides in UC patients at SM, CL, bone density (p<0.05), CMi, and condylar volume (p<0.005) with no consistency for which side is smaller. Removing age and gender as confounding variables, bone density (p=0.011), condylar volume (p<0.001), and the left CL measurement (p=0.029) were found to be larger in UC patients. Finally, condylar volume was the single measurement that was found, bilaterally, to be larger (p<0.001) in UC patients compared to controls.
Conclusions: Spatial availability and morphologic differences between sides in UC patients along with muscular activity and volumetric distinctions compared to controls further illustrate the significant impact UCC can have on the condylar region, potentially contributing to TMD in a visible way.
Methods: 132 CBCT scans of UC and control patients were analyzed. Bilateral measurements were taken in Invivo5.0 of the condylar head and surrounding space in sagittal and coronal cross-sections; these measurements – sagittal anterior (SA), sagittal middle (SM), sagittal posterior (SP), coronal medial (CM), coronal middle (CMi), and coronal lateral (CL) – were then related to the control measurements. Bone density at a masseteric insertion site was analyzed in Invivo5.0 to compare muscular strength in UCC versus controls. Finally, a comparison of condylar volumes was completed in Dolphin Software.
Results: There was an asymmetric spatial availability between the crossbite and non-crossbite sides in UC patients at SM, CL, bone density (p<0.05), CMi, and condylar volume (p<0.005) with no consistency for which side is smaller. Removing age and gender as confounding variables, bone density (p=0.011), condylar volume (p<0.001), and the left CL measurement (p=0.029) were found to be larger in UC patients. Finally, condylar volume was the single measurement that was found, bilaterally, to be larger (p<0.001) in UC patients compared to controls.
Conclusions: Spatial availability and morphologic differences between sides in UC patients along with muscular activity and volumetric distinctions compared to controls further illustrate the significant impact UCC can have on the condylar region, potentially contributing to TMD in a visible way.