Article

Applicability of Bolton tooth-size ratios in racial groups.

Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, Brazil.
World journal of orthodontics 01/2010; 11(4):e57-62. pp.e57-62
Source: PubMed

ABSTRACT To determine whether there is sexual dimorphism regarding Bolton ratios within four ethnic groups and to compare them against Bolton standards.
The sample consisted of 140 dental study casts of untreated normal occlusion subjects, derived from four racial groups: black, white, Afro-Mediterranean, and Japanese. Anterior and overall Bolton ratios were calculated for each cast. The Kolmogorov-Smirnov test, t test, and one-way ANOVA were used.
No statistically significant sexual dimorphism in anterior or total tooth-size ratios were found within any group. Only the Japanese anterior ratio (75.09) was statistically less than the Bolton standard (77.2; P<.001).
The Bolton ratio can be applied to the investigated ethnic groups except for the anterior ratio in Japanese patients.

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Keywords

140 dental study casts
 
Anterior
 
anterior ratio
 
Bolton ratio
 
Bolton ratios
 
Bolton standard
 
Bolton standards
 
ethnic groups
 
investigated ethnic groups
 
Japanese anterior ratio
 
Kolmogorov-Smirnov test
 
one-way ANOVA
 
racial groups
 
statistically significant sexual dimorphism
 
t test
 
untreated normal occlusion subjects
 

Thais Maria Freire Fernandes