Labial and buccal surface contours of Korean normal occlusion in a three-dimensional digital model

Ji-Hyeon Chae; Jin-Wook Song; Jung-Yul Cha; Jung-Soo Choi; Young-Chel Park

doi:10.4041/kjod.2008.38.2.95

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Chae, Song, Cha, Choi, and Park: Labial and buccal surface contours of Korean normal occlusion in a three-dimensional digital model

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2008; 38(2): 95-103.

Published online: 30 April 2008

DOI: https://doi.org/10.4041/kjod.2008.38.2.95

Labial and buccal surface contours of Korean normal occlusion in a three-dimensional digital model

Ji-Hyeon Chae, DDS^a, Jin-Wook Song, MS^b, Jung-Yul Cha, DDS, MSD, PhD^c, Jung-Soo Choi^d, Young-Chel Park, DDS, MSD, PhD^e

^aResident, Department of Orthodontics, School of Dentistry, Yonsei University, Korea.

^bGraduate student, Department of Orthodontics, School of Dentistry, Yonsei University, Korea.

^cAssistant professor, Department of Orthodontics, School of Dentistry, Yonsei University, Korea.

^dResearch Scientist, HT Corp., Korea.

^eProfessor, Department of Orthodontics, School of Dentistry, Dental Science Research Institute, Yonsei University, Korea.

Corresponding author: Young-Chel, Park. Department of Orthodontics, College of Dentistry, Yonsei University, Seongsanno 250, Seodaemun-Gu, Seoul 120-752, Korea. +82 2 2228 3000; ypark@yuhs.ac.

Received 17 March 2008 Revised 10 April 2008 Accepted 12 April 2008

Abstract

Objective

This study was performed to investigate the labio/buccal clinical crown curvatures of Korean permanent teeth and to obtain the curve-ratio data in an attempt to fabricate bracket bases fit for each individual Korean permanent tooth.

Methods

Three-dimensional digital models were made from 30 sets of dental casts with normal anatomic structures. According to the FA points, horizontal and vertical reference planes were established and lines were drawn on the tooth surfaces in reference to these planes. The curvature was expressed as the coefficient of a quadratic equation. Lines mesial, distal, gingival and occlusal to the horizontal, vertical reference planes and the FA point were drawn.

Results

The curvature measured for each line revealed that there are no significant differences between male and female, except for maxillary canines and maxillary second bicuspids (p > 0.05). There were notable differences in the mesio-distal or gingivo-occlusal curvatures among the mandibular lateral incisors, maxillary canines, maxillary and mandibular first and second bicuspids and first molars (p < 0.05).

Conclusions

The labial & buccal crown curvatures of teeth in Korean normal occlusion were measured on the mesial and distal, gingival and occlusal sides respectively in this study. Based on these data, a SWA can be developed to fit the individual features of Korean tooth crowns.

Keywords: Curvature, Straight Wire Appliance, Korean

Figures and Tables

Fig 1

Orapix KOD-300 scanner.

Fig 2

The establishment of horizontal reference plane at maxilla. Some FA points may not be on the horizontal reference plane due to average calculation.

Fig 3

The establishment of horizontal and vertical reference plane at maxillary first premolar.

Fig 4

The establishment of horizontal and vertical reference curves at maxillary first premolar (A) and first molar (B).

Fig 5

The features which forms axis of coordinates on maxillary second premolar. X and Y axes on the horizontal reference plane have the same Z value which is 0.

Fig 6

Graphs of crown curvatures in each reference plane. Left, Labial/buccal curvatures; Right, occluso/gingival curvatures. Bar show means, and error bars show 95.0% confidence limit of mean. MB, Mesiobuccal surface; DB, distobuccal surface.

Fig 7

Comparison of the ceramic bracket (Miso, HT, Ansan, Korea) curvatures and the mean value curvatures in horizontal (left) and vertical (right) plane at maxillary second premolar.

Table 1

The specification of 'Orapix KOD-300 scanner'

Table 2

Labial/buccal curvatures of crown surface of maxillary dentition

SD, Standard deviation; MB, mesiobuccal surface; DB, distobuccal surface.

Table 3

Labial/buccal curvatures of crown surface of mandibular dentition

SD, Standard deviation; MB, mesiobuccal surface; DB, distobuccal surface.

Table 4

Comparison of mesial-distal and occlusal-gingival curvatures

M-D, Mesial-distal curvature; O-G, occlusal-gingival curvature; MB, mesiobuccal surface; DB, distobuccal surface; ^*p < 0.05; ^†p < 0.01; ^‡p < 0.001.

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