Journal of the Korean Academy of Pediatric Dentistry 2003;30(4):637-642.
Published online November 30, 2003.
THE RADIOGRAPHICAL MEASUREMENT OF ROOT CANAL CURVATURE OF MANDIBULAR PRIMARY 2ND MOLARS
 
Correspondence:  , 
Abstract
Morphology of primary root divergency and curvature determines the pattern of root resorption and periapical lesion, and affects successful root canal treatment. With the purpose of analysing the morphology of primary mandibular second molar roots and canals, the frequency, angle, radius, and start of curvature of the canal were measured. Fifty clinical radiographs were taken from 3~6 years old children, followed by digitizing after scanning and analyzing by Scion image Beta 4.02TM(Scion Co. USA). The angle of curvature was determined by Schneider's method and the radius of curvature was determined by Schaefer's method. The results were as follows: 1. The angle of curvatures were 17.3˚±5.0 (mesial), and 27.9˚±6.0 (distal). Distal curvature was significantly larger than mesial.(p<0.05) 2. The radius of curvatures were 8.7mm±2.5 (mesial), and 5.8mm±1.5 (distal). Mesial curvature was significantly larger than distal.(p<0.05) 3. The start of curvatures were 4.1mm±0.6 (mesial), and 4.2mm±0.6 (distal). There were no difference between two groups. (P<0.05)
Key Words: Mandibular primary 2nd molar, Root curvature


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