Bolton discrepancy
Definition : disproportion among size of individual teeth that prevents ideal occlusion/ interdigitation : How to calculate Overall ratio 12 teeth Sum of mandibular 12 teeth ÷ sum of maxillary 12 teeth Normal ratio : 91.3% More than 91.3% : mand. Excess (strip lower or enlarge upper) Less than 91.3% : max. Excess ( strip upper or enlarge lower ) ____________________________ (Anterior ratio (6 teeth Sum mandibular 6 teeth ÷ some maxillary 6 teeth Normal ratio: 77.2% More than 77.2% : mandibular anterior excess (class II canine end; strip lower or enlarge upper) Less than 77.2% : maxillary anterior excess (class III canine end; strip upper or enlarge lower)