Abstract
BackgroundOrthodontic patients show high prevalence of tooth-size discrepancy. This study investigates the possible association between arch form, clinically significant tooth-size discrepancy, and sagittal molar relationship.MethodsPretreatment orthodontic casts of 230 Saudi patients were classified into one of three arch form types (tapered, ovoid, and square) using digitally scanned images of the mandibular arches. Bolton ratio was calculated, sagittal molar relationship was defined according to Angle classification, and correlations were analyzed using ANOVA, chi-square, and t-tests.ResultsNo single arch form was significantly more common than the others. Furthermore, no association was observed between the presence of significant Bolton discrepancy and the sagittal molar relationship or arch form. Overall Bolton discrepancy is significantly more prevalent in males.ConclusionsArch form in a Saudi patient group is independent of gender, sagittal molar relationship, and Bolton discrepancy.
Highlights
Orthodontic patients show high prevalence of tooth-size discrepancy
Many investigators evaluated the effect of tooth-size discrepancy on occlusion among different malocclusion groups, sexes, and ethnicities
This study examines the arch form distribution in a sample of Saudi orthodontic patients, to evaluate the percentage of patients who present with a significant tooth-size discrepancy, and to investigate the possible association between arch form, clinically significant tooth-size discrepancy, and sagittal molar relationship
Summary
Orthodontic patients show high prevalence of tooth-size discrepancy. This study investigates the possible association between arch form, clinically significant tooth-size discrepancy, and sagittal molar relationship. Orthodontic diagnosis and treatment planning require properly trimmed study casts in order to analyze dental relationships. One of these measurements is tooth-size discrepancy, which is defined as disproportionate sizing of opposing teeth [1]. Araujo and Souki reported higher prevalence of tooth-size discrepancy in individuals with Class III than with Class I malocclusion [4]. This trend was reported in a southern Chinese population and a Saudi population [5, 6]. Individuals with malocclusion present with significantly higher tooth-size ratios than those with untreated normal occlusions [7]
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