하악 제1대구치의 치근 만곡에 영향을 주는 요인

• Published in: Imaging science in dentistry pp. 55 - 62
• Main Authors: 최항문, 이원진, 허민석, 이삼선, 김정화, 최순철, 박태원
• Format: Journal Article
• Language: Korean
• Published: 대한영상치의학회 01.03.2006
• Subjects: 치의학
• ISSN: 2233-7822; 2233-7830

Purpose : To find the cause of root curvature by use of panoramic and lateral cephalometric radiograph.Materials and Methods : Twenty six 1st graders whose mandibular 1st molars just emerged into the mouth were selected. Panoramic and lateral cephalometric radiograph were taken at grade 1 and 6, longitudinally. Incephalometric radio graph, mandibular plane angle, ramus-occlusal plane angle, gonial angle, and gonion-gnathion distance (Go-Gn distance) were measured. In panoramic radio graph, elongated root length and root angle were measured by means of digital subtraction radiography. Occlusal plane-tooth axis angle was measured, too. Pearson correlations were used to evaluate the relationships between root curvature and elongated length and longitudinal variations of all variables. Multiple regression equation using related variables was computed.Results : The Pearson correlation coefficient between curved angle and longitudinal variations of occlusal planetooth axis angle and ramus-occlusal plane angle was 0.350 and 0.401, respectively (p.0.05). There was no significant correlation between elongated root length and longitudinal variations of all variables. The resulting regression equation was Y=10.209+0.208X1+0.745X2 (Y: root angle, X1: variation of occlusal plane-tooth axis angle, X2: variation of ramus-occlusal plane angle).Conclusion : It was suspected that the reasons of root curvature were change of tooth axis caused by contact with 2nd deciduous tooth and amount of mesial and superior movement related to change of occlusal plane. (Korean J Oral Maxillofac Radiol 2006; 36 : 55-62) KCI Citation Count: 0