Korean J Orthod.  2011 Jun;41(3):184-190. 10.4041/kjod.2011.41.3.184.

Relationship between mesiodistal width and enamel thickness in mandibular incisors

Affiliations
  • 1Department of Orthodontics, School of Dentistry, Chosun University, Korea. shlim@chosun.ac.kr

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.

Keyword

Enamel thickness; MD/FL index; Mesiodistal width; Reproximation

MeSH Terms

Dental Enamel
Incisor
Tooth Cervix

Figure

  • 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.


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