Journal of the Korean Academy of Pediatric Dentistry 2011;38(4):337-347.
Published online November 30, 2011.
MORPHOLOGICAL FEATURES OF THE CROWNS OF MAXILLARY SECOND PRIMARY MOLAR AND FIRST PERMANENT MOLAR: AN ODONTOMETRIC STUDY
Ji-In Kim, Hong-Keun Hyun, Young-Jae Kim, Jung-Wook Kim, Ki-Taeg Jang, Sang-Hoon Lee, Se-Hyun Hahn, Chong-Chul Kim
Department of Pediatric Dentistry, School of Dentistry, Seoul National University 
Correspondence:  Chong-Chul Kim,  Tel: 02-2072-3395, Email: kimcc@snu.ac.kr
Received: 30 June 2011   • Accepted: 10 October 2011
Abstract
The basic structure of the primary crowns usually resemble their succeeding permanent teeth. However, maxillary second primary molars resemble ipsilateral first permanent molars. Accordingly in this study, odontometric data of the two teeth was obtained, then analyzed to verify the morphological relationship and sex difference between the two teeth. Dental study casts were examined for their mesiodistal and buccolingual width of the crowns, diameter of each cusps, and intercuspal distances. Photographs of the crowns were taken to measure the angles between each cusp tip. The results are as follows : 1. In boys, PrI, PaI, DBC angle, and MBC angle did not show any statistically significant difference between the two teeth(p>0.05), and moderate level of correlations were observed. 2. In girls, crown index, DBC angle, and MBC angle of the two teeth did not show any statistically significant difference(p>0.05), and moderate level of correlations were recognized. 3. Measurements that did not show statistically significant difference between the two teeth in both boys and girls were DBC angle and MBC angle(p>0.05). In DLC angle, however, statistically significant difference was observed(p<0.01). 4. Most of the measurements showed sex differences, except DBC angle, which did not show any sex difference in both teeth(p>0.05).
Key Words: Maxillary first permanent molar, Maxillary second primary molar, Odontometry, Morphology, Correlation


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