J Adv Prosthodont.  2016 Apr;8(2):125-130. 10.4047/jap.2016.8.2.125.

Does the maxillary anterior ratio in Korean adults follow the Golden Proportion?

• Jin MX
• Hong MH
• Lee KJ
• Lee KB

• KMID: 2176652
• DOI: http://doi.org/10.4047/jap.2016.8.2.125

Abstract

PURPOSE
The purpose of this study was to determine the effect of changes in the horizontal plane angle on the mesiodistal width ratios of the maxillary anterior teeth during the acquisition of frontal view photographs, derive these ratios for Korean adults on the basis of the data obtained, and analyze them using the Golden Proportion as a reference.
MATERIALS AND METHODS
In experiment I, 30 plaster casts were mounted on an articulator and positioned on the angle-measuring device with a center setting of 0°. The device was rotated to 10° in 1° increments in a counterclockwise direction. At each angle, photographs were obtained and analyzed. Experiment II was based on 60 patients who visited the Department of Prosthodontics at Kyungpook National University Dental Hospital from February 2012 to February 2015. The patients were divided into three groups [Male (M), Female (F), Total (M + F)]. Frontal views were obtained for all groups and analyzed.
RESULTS
From 1° to 10°, the relative mesiodistal width ratios for the maxillary anterior teeth showed no significant differences from those at 0°. In all three groups, the relative width ratio of the maxillary central incisor was smaller than that specified in the Golden Proportion; the opposite was true for the canine.
CONCLUSION
Our results suggest that the mesiodistal width ratios of the maxillary anterior teeth do not follow the Golden Proportion in Korean adults, and that a change in the horizontal plane angle from 1° to 10° during frontal photography does not affect these ratios.

Keyword

Korean adults; Maxillary anterior mesiodistal width ratio; Golden Proportion

MeSH Terms

Adult*
Casts, Surgical
Dental Articulators
Female
Gyeongsangbuk-do
Humans
Incisor
Photography
Prosthodontics
Tooth

Figure

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  Fig. 1 Angle-measuring device.

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  Fig. 2 Marking the heights of the contours of the maxillary anterior teeth with an Illustrator CC The mesiodistal width (red line) is the horizontal line connecting each vertical line (black lines).

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  Fig. 3 Measurement of mesiodistal widths from the frontal view. Measurements in experiments I and II were obtained in the same manner.

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  Fig. 4 The formula for the maxillary anterior mesiodistal width ratios measured on frontal photographs. Here, "a" represents the mesiodistal width of the left maxillary central incisor, "b" represents that of the lateral incisor, and "c" represents that of the canine *indicates the other side of the same tooth.

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  Fig. 5 Mesiodistal width ratios of the maxillary anterior teeth in relation to the Golden Proportion in the male, female, and total (male + female) groups. The lateral incisor width is always 1.0. *indicates a significant difference as per the one-sample t-test.

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