KUMJ | VOL. 13 | NO. 3 | ISSUE 51 | JULY-SEPT. 2015
Nepalese Esthetic Dental (NED) Proportion in Nepalese Population
Rokaya D, Kitisubkanchana J, Wonglamsam A, Santiwong P, Srithavaj T, Humagain M
Abstract: Background
Lots of studies on maxillary anterior teeth proportions have been studied in different
populations in various countries, but no studies have been conducted in Nepal on the
esthetic maxillary anterior teeth proportions.
Objective
The study was done to investigate the maxillary anterior teeth proportions in a
Nepalese population. Teeth proportions in the total population were compared with
golden proportion (GP) and golden standard (GS).
Method
A total of 150 Nepalese subjects were divided in three facial types; broad, average and
narrow group. Maxillary anterior teeth were measured from dental casts using digital
calipers. The perceived width ratios of lateral to central incisor (LI/CI) and canine to
lateral incisor (CN/LI), ratios of mean central incisor length to 2 central incisor widths
(CIL/2CIW), and actual width to length ratios (WLRs) (%) were calculated in each
facial type and compared. Mean LI/CI, CN/LI and CIL/2CIW in total population were
calculated and compared with GP (0.618), and mean WLRs in the total population
were compared with GS (80%). All teeth proportions were compared among three
facial types. One-sample t-test and one-way ANOVA were performed to analyze the
data (α = 0.05).
Result
The LI/CI, CN/LI, CIL/2CIW and WLRs in three facial types showed no significant
difference. The LI/CI, CN/LI and CIL/2CIW in the total population were 66%, 70% and
55% respectively, and were significantly different from GP. The WLRs for CI, LI and CN
in the total population were 90%, 86% and 89% respectively and significantly differed
from GS. These values were considered to constitute the Nepalese Esthetic Dental
(NED) proportion.
Conclusion
No significant difference of maxillary anterior teeth proportions were observed
among three facial types. Teeth proportions in the total population significantly
differed from GP and GS. We propose the NED proportion as a guideline for dental
treatment in the maxillary anterior region in Nepalese populations.
Keyword : Anterior tooth, esthetics, golden proportion, golden standard, Nepalese population, teeth proportion.
