J Adv Prosthodont.  2017 Apr;9(2):93-98. 10.4047/jap.2017.9.2.93.

Analysis of the width ratio and wear rate of maxillary anterior teeth in the Korean population

• Oh YA
• Yang HS
• Park SW
• Lim HP
• Yun KD
• Park C

• KMID: 2376295
• DOI: http://doi.org/10.4047/jap.2017.9.2.93

Abstract

PURPOSE
The purpose of this study was to compare the width ratio of maxillary anterior teeth according to age in the Korean population and to evaluate the maxillary central incisor width-to-length (W/L) ratio, given differences in age and gender.
MATERIALS AND METHODS
Ninety-three Korean adults were divided into 3 groups (n = 31) by age. Group I was 20 - 39 years old, Group II was 40 - 59 years old, and Group III was over 60 years of age. After taking an impression and a cast model of the maxillary arch, the anterior teeth width ratio and central incisor W/L ratio were calculated from standard digital images of the cast models using a graph paper with a digital single lens reflex (DSLR) camera. The calculated ratios were compared among all groups and central incisor W/L ratio were analyzed according to age and gender. All comparative data were statistically analyzed with one-sample t-tests, one-way ANOVAs with Tukey tests, and independent t-tests.
RESULTS
No significant differences in maxillary anterior teeth ratios were found among the age groups. The maxillary central incisor W/L ratios in Group III were the greatest and were significantly higher than those in the other groups. The central incisor W/L ratio of men was higher than that of women in Group II.
CONCLUSION
Maxillary anterior teeth width ratios were similar in all age groups in the Korean population. The maxillary central incisor was observed as worn teeth in the group over 60 years of age, and a significant difference between genders was found in 40 to 50 year olds.

Keyword

Korean anterior teeth; Anterior teeth width ratio; Maxillary central incisor; Width-to-length ratio; Anterior tooth analysis

MeSH Terms

Adult
Female
Humans
Incisor
Male
Reflex
Tooth*

Figure

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  Fig. 1 (A) Maxillary dental cast setting on graph paper, (B) DSLR camera's viewfinder, (C) Photographing view by auto focusing mode with 4 points.

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  Fig. 2 The visible mesio-distal width of maxillary anterior teeth was measured at the central incisor (A), lateral incisor (B), and canine (C).

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  Fig. 3 The visible mesio-distal width (A) and apicocoronal length (B) of maxillary central incisor.

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