![]() Conclusions: Dental arch widths, lengths, perimeter had no effect on Bolton's ratios.īackground: Variation in tooth size is influenced by genetic and environmental factors. Statistically, there was no relationship between dental arch parameters and Bolton's ratios. Results: The mean values of anterior and overall Bolton's ratios were near to that reported by original study of Bolton. Pearson's correlation coefficient test was used to test the relation between the anterior and overall Bolton's ratios with the dental arches parameters. Anterior and overall tooth size ratios, dental arches widths, lengths and perimeters of maxillary and mandibular arches were measured using digital caliper. Materials and Method: This investigation was performed on a sample of dental casts belong to sixty Iraqi individuals. The aim of this study was to test whether Bolton's tooth size ratios were affected by the maxillary and mandibular dental arch widths, lengths and perimeter. He developed two ratios one related the whole teeth anterior to the second molars and the other from canine to canine. Bolton in 1958 introduced his analysis depending on the study models of fifty five cases with excellent occlusion, of which 44 cases where treated orthodontically (non-extraction) and 11 cases were untreated. Background: The main objectives in treating any orthodontic case are establishing stable occlusion with normal overjet and overbite class I canines relationship and good teeth interdigitation with appropriate proportion of maxillary and mandibular teeth widths.
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