Do Dental Arches Lengths, Widths and Perimeters affect Bolton's Ratios? Al-Ansari Nadia Basim1, Ameer Suha Ali Abdul1, Nahidh Mohammed2,* 1Department of POP, Al-Rafidain University College, Baghdad, Iraq 2Department of Orthodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq *Corresponding author: Mohammed Nahidh, E-mail: m_nahidh79@yahoo.com
Online published on 4 June, 2019. Abstract 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. 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. He developed two ratios one related the whole teeth anterior to the second molars and the other from canine to canine. 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. Materials and Method This investigation was performed on a sample of dental casts belong to sixty Iraqi individuals. Anterior and overall tooth size ratios, dental arches widths, lengths and perimeters of maxillary and mandibular arches were measured using digital caliper. Pearson's correlation coefficient test was used to test the relation between the anterior and overall Bolton's ratios with the dental arches parameters. Results The mean values of anterior and overall Bolton's ratios were near to that reported by original study of Bolton. Statistically, there was no relationship between dental arch parameters and Bolton's ratios. Conclusions Dental arch widths, lengths, perimeter had no effect on Bolton's ratios. Top Keywords Bolton's ratio, arch widths, arch lengths, arch perimeters, tooth size. Top |