Journal of the Korean Academy of Pediatric Dentistry 2009;36(3):325-336.
Published online August 31, 2009.
ERUPTION PATTERN OF THE MANDIBULAR FIRST MOLAR USING THE CONE BEAM CT
Jeong-Keun Shin, Jae-Gon Kim, Byeong-Ju Baik, Yeon-Mi Yang, Jin-Woo Jeong
Department of Pediatric dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University 
Correspondence:  Byeong-Ju Baik,  Tel: 063-250-2215, Email: bjbaik@moak.chonbuk.ac.kr
Received: 28 January 2009   • Accepted: 28 July 2009
Abstract
The purpose of this study was to investigate the eruption pattern of the mandibular first molar in sagittal, frontal and horizontal views using the cone beam CT scanning. CT images were obtained from healthy 83 children (42 boys, 41 girls) between 3 to 10 years of age with a normal dentition according to Nolla stage. 1. In the frontal and horizontal view, the intermolar width decreased continuously with stage and slightly increased at the last stage. 2. In the sagittal and frontal view, eruption distances from occlusal plane were observed the largest change between stage 5 and 7. 3. In the horizontal and sagittal view, mandibular first molar from distal surface of primary second molar moved distally between stage 4 and 6. 4. In the sagittal view, angle from occlusal plane to mesio-distal axis increased between stage 4 and 8. 5. In the frontal view, angle from occlusal plane to bucco-lingual axis increased continuously during all stage. 6. In the horizontal view, angle from midsagittal plane to long axis increased between stage 5 and 8.
Key Words: Eruption of first molar, Nolla stage, Cone beam CT, 3D analysis


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