120例中国成年人上前牙美学比例分析

doi:10.19723/j.issn.1671-167X.2020.06.024

Abstract

Abstract:

Objective: To analyze the esthetic proportions of maxillary anterior teeth in term of the apparent widths proportion of the adjacent teeth and width/height ratio of the clinical crown in 120 Chinese adults. Methods: Maxillary gypsum casts were obtained from the dental laboratories of stomatological hospitals in North China, Southeast China, and Southwest China, according to the inclusion criteria and exclusion criteria. Standardized digital photographs of each cast were recorded. The apparent widths and actual widths and heights of the central incisors, lateral incisors and canines were determined by ImageJ software for the calculation of apparent widths proportion of the adjacent teeth and width/height ratio of the clinical crown. The ideal apparent widths proportion (Golden proportion and Preston proportion) and width/height ratio (0.80) were tested. The gender, arch side, and regional differences were investigated. Results: The apparent widths proportion of the lateral/central incisor was 0.724±0.047, of the canine/lateral incisor was 0.814±0.092. The width/height ratio of the central incisor was 0.848±0.072, of the lateral incisor was 0.834±0.094, of the canine was 0.883±0.098. The esthetic proportions were different from the predicted ideal ratio (P<0.001). The apparent widths proportion of lateral/central incisor was significantly larger in the right side than that in the left side (0.730± 0.044 vs. 0.718±0.050), and was significantly smaller in North China than that in Southwest China (0.711±0.051 vs. 0.731±0.044). The width/height ratio of the central incisor was significantly larger in the female than that in the male (0.855±0.074 vs. 0.835±0.068), and in the right side than that in the left side (0.855±0.073 vs. 0.842±0.072). The width/height ratio of the lateral incisor was significantly larger in the female than that in the male (0.843±0.097 vs. 0.817±0.084). Conclusion: The apparent widths proportion of adjacent teeth and the width/height ratio of the clinical crown in Chinese adults are different from the foreigner’s. The esthetic proportion parameters have significant population specificity, and the measurements cannot be generalized as well as it should be applied with caution.

Key words: Dental esthetics, Incisor, Adult, Tooth crown, Odontometry

CLC Number:

R783

Wei-liang WU,Xiao ZENG,Xiao-qiang LIU,Jian-guo TAN. Esthetic proportions of maxillary anterior teeth of 120 Chinese adults[J].Journal of Peking University (Health Sciences), 2020, 52(6): 1130-1134.

Figures/Tables 3

Figure 1

Table 1

Apparent widths proportion of adjacent maxillary anterior teeth by gender, side, and region"

Items	Lateral incisor/central incisor		Canine/lateral incisor
Items	$x -$ ±s	P	$x -$ ±s	P
Average	0.724±0.047		0.814±0.092
Gender
Female	0.724±0.048^a	0.878	0.817±0.093^a	0.529
Male	0.725±0.046^a		0.808±0.090^a
Side
Right	0.730±0.044^a	0.012	0.822±0.090^a	0.089
Left	0.718±0.050^b		0.806±0.094^a
Region
North	0.711±0.051^a		0.819±0.099^a
Southeast	0.726±0.047^a,b	0.044	0.805±0.098^a	0.512
Southwest	0.731±0.044^b		0.819±0.081^a

Table 1

Table 2

Width/height ratio of maxillary anterior teeth by gender, side, and region"

Items	Central incisor
Items	$x -$ ±s	P	$x -$ ±s	P	$x -$ ±s	P
Average	0.848±0.072		0.834±0.094		0.883±0.098
Gender
Female	0.855±0.074^a	0.047	0.843±0.097^a	0.045	0.891±0.094^a	0.067
Male	0.835±0.068^b		0.817±0.084^b		0.866±0.105^a
Side
Right	0.855±0.073^a	0.002	0.841±0.092^a	0.076	0.887±0.092^a	0.318
Left	0.842±0.072^b		0.828±0.096^a		0.879±0.104^a
Region
North	0.838±0.072^a		0.820±0.090^a		0.894±0.095^a
Southeast	0.858±0.079^a	0.251	0.842±0.095^a	0.347	0.897±0.103^a	0.063
Southwest	0.847±0.066^a		0.836±0.095^a		0.862±0.092^a

Table 2

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Esthetic proportions of maxillary anterior teeth of 120 Chinese adults

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