Seulgi Han1, Sang Min Shin2, Yong-Seok Choi3, Ki Beom Kim4, Tetsutaro Yamaguchi5, Koutaro Maki5, Chooryung J Chung6, Yong-Il Kim7,8. 1. Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Geumoro20, Mulgeumeup, Yangsan, South Korea. 2. Department of Management Information Systems, College of Business, Dong-A University, Busan, South Korea. 3. Department of Statistics, College of Natural Science, Pusan National University, Busan, South Korea. 4. Department of Orthodontics, Saint Louis University, Saint Louis, MO, USA. 5. Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan. 6. Department of Orthodontics, Gangnam Severance Dental Hospital, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, South Korea. 7. Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Geumoro20, Mulgeumeup, Yangsan, South Korea. kimyongil@pusan.ac.kr. 8. Institute of Translational Dental Sciences, Pusan National University, Busan, South Korea. kimyongil@pusan.ac.kr.
Abstract
OBJECTIVE: To examine the morphologic similarities and differences in mandibular condyle and glenoid fossa between the deviated and non-deviated sides in patients with facial asymmetry using statistical analysis. METHODS: One hundred eighty-four patients (95 men, 89 women; mean age, 22.30 ± 3.87 years) with facial asymmetry were examined with cone-beam computed tomography (CBCT). Shape analysis was performed to compare the shapes and sizes of the condyle and fossa between the deviated and non-deviated sides in the frontal and lateral aspects. Ordinary Procrustes analysis (OPA) was used to determine shape variations of the fossa and condyle. RESULTS: Shape variations derived from ordinary sum of squares (OSS) suggested that, in the frontal aspect, there was a difference between the two sides in both the fossa and condyle (P < 0.05). In the lateral aspect, there was no difference in fossa shape between the two sides (P > 0.05); however, the shape of condyle was different between the non-deviated and deviated sides (P < 0.05). Size comparison in OPA matching and centroid size (CS) in the frontal aspect demonstrated that the non-deviated side was larger than the deviated side. In the lateral aspect, fossa showed no difference in CS between the two sides (P > 0.05); however, the non-deviated side was larger than the deviated side for condyle (P < 0.05). CONCLUSIONS: Morphometric differences in condyle and fossa between the deviated and non-deviated sides were observed. Structures of the non-deviated side were relatively larger than those of the deviated side, except for fossa in the lateral aspect.
OBJECTIVE: To examine the morphologic similarities and differences in mandibular condyle and glenoid fossa between the deviated and non-deviated sides in patients with facial asymmetry using statistical analysis. METHODS: One hundred eighty-four patients (95 men, 89 women; mean age, 22.30 ± 3.87 years) with facial asymmetry were examined with cone-beam computed tomography (CBCT). Shape analysis was performed to compare the shapes and sizes of the condyle and fossa between the deviated and non-deviated sides in the frontal and lateral aspects. Ordinary Procrustes analysis (OPA) was used to determine shape variations of the fossa and condyle. RESULTS: Shape variations derived from ordinary sum of squares (OSS) suggested that, in the frontal aspect, there was a difference between the two sides in both the fossa and condyle (P < 0.05). In the lateral aspect, there was no difference in fossa shape between the two sides (P > 0.05); however, the shape of condyle was different between the non-deviated and deviated sides (P < 0.05). Size comparison in OPA matching and centroid size (CS) in the frontal aspect demonstrated that the non-deviated side was larger than the deviated side. In the lateral aspect, fossa showed no difference in CS between the two sides (P > 0.05); however, the non-deviated side was larger than the deviated side for condyle (P < 0.05). CONCLUSIONS: Morphometric differences in condyle and fossa between the deviated and non-deviated sides were observed. Structures of the non-deviated side were relatively larger than those of the deviated side, except for fossa in the lateral aspect.