Effects of premolar extractions on Bolton index overall ratios

Abstract

Abstract: PURPOSE:To investigate the effect of premolar extraction on Bolton index overall ratios. METHODS:Bolton index overall ratios were measured in 198 randomly chosen dental casts of three types of Angle’s malocclusions before and after 4 combinations of hypothetical premolar extractions. The data was processed using SPSS 17.0 software package. RESULTS:The overall ratios decreased in each class of Angle’s malocclusion after all combinations of premolars extraction, and the decreases in combinations of 5/5 and 5/4 extractions were significantly greater than that of 4/4 and 4/5 combinations (P<0.05), but no significant difference was found between different types of malocclusion (P>0.05). CONCLUSIONS:When formulating a treatment plan involving premolar extractions, orthodontists should consider that the Bolton overall ratios may decrease.

Key words: Hypothetical tooth extraction, Premolar, Bolton index, Overall ratios

CLC Number:

R783.5

WEI Zhu-liang, WANG Yi-ling, ZHANG Wen-mei. Effects of premolar extractions on Bolton index overall ratios[J]. Shanghai Journal of Stomatology, 2014, 23(4): 485-488.

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