Relationship between mesiodistal width and enamel thickness in mandibular incisors

Uk Han; Sung-Nam Gang; Sung-Hoon Lim

doi:10.4041/kjod.2011.41.3.184

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Han, Gang, and Lim: Relationship between mesiodistal width and enamel thickness in mandibular incisors

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2011; 41(3): 184-190.

Published online: 28 June 2011

DOI: https://doi.org/10.4041/kjod.2011.41.3.184

Relationship between mesiodistal width and enamel thickness in mandibular incisors

Uk Han, DDS, MSD^a, Sung-Nam Gang, DDS, MSD^b, Sung-Hoon Lim, DDS, MSD, PhD^c

^aGraduate Student, Department of Orthodontics, School of Dentistry, Chosun University, Korea.

^bFellow, Department of Orthodontics, School of Dentistry, Chosun University, Korea.

^cAssociate Professor, Department of Orthodontics, School of Dentistry, Chosun University, Korea.

Corresponding author: Sung-Hoon Lim. Department of Orthodontics, Chosun University Dental Hospital, 421 Seoseok-dong, Dong-gu, Gwangju 501-825, Korea. +82 62 220 3874; shlim@chosun.ac.kr

Received 28 December 2010 Revised 15 April 2011 Accepted 18 April 2011

Abstract

Objective

The purpose of this study was to investigate the relationship between the enamel thickness of proximal surfaces and the morphologic features of mandibular incisors.

Methods

Mesiodistal/faciolingual (MD/FL) index, MD width, and height of contour width/cervical width ratio were measured in 40 incisors extracted from Koreans. For determining the height of contour width/cervical width ratio, the cervical width was measured as the distance between proximal cementoenamel junctions. Then, the labial surface was ground to the height of the contour level to measure enamel thickness. Pearson correlation analysis was used to investigate the correlation between enamel thickness and morphologic features.

Results

Enamel thickness was 0.75 ± 0.07 mm per side, and MD width was 5.56 ± 0.40 mm. Enamel thickness and MD width were significantly correlated. However, a significant relationship was not observed between enamel thickness and MD/FL index or the height of contour width/cervical width ratio.

Conclusions

The results suggest that enamel thickness is affected only by MD width. Therefore, if the MD width is the same for mandibular incisors with a large MD/FL index or triangular shape and mandibular incisors with normal shape, then the limit of enamel reduction for reproximation will be the same.

Keywords: Enamel thickness, MD/FL index, Mesiodistal width, Reproximation

Figures and Tables

Fig. 1

Scanned image of tooth surface (Lt) and measurement of mesiodistal width on the scanned image (Rt). Incisors were ground down to less than 1 mm thickness.

Fig. 2

Linear measurements of height of contour width and cervical width. 1, Height of contour width; 2, cervical width. Height of contour width is the same as mesiodistal width and cervical width is the width between cementoenamel junctions on both sides. Height of contour width/cervical width ratio was calculated from these two measurements.

Table 1

Measurements of mesiodistal (MD) width, cervical width, faciolingual (FL) width, MD/FL index, and MD/cervical width ratio

MD, Mesiodistal width; FL, faciolingual width; SD, standard deviation. Total number of sample is 40.

Table 2

Comparison of lower incisor mesiodistal width (mm) with other studies

SD, Standard deviation.

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