The clinical application of tooth size analysis among different malocclusion groups : a cross sectional, comparative, cephalometric study

الملخص EN

Objective : The aim of the investigation was to compare overall and anterior Bolton ratios in different malocclusion groups of sample of Iraqi patients applying for orthodontic treatment and to compare them with Bolton’s standards. Setting : cross-sectional, comparative, cephalometric study. Methods : Cross sectional data was gathered from the study casts of patients need orthodontic treatment, after obtaining informed written consent from them.

130 out of 150 study casts were filtered based upon the inclusion and exclusion criteria.

ANB angle was traced on corresponding lateral cephalograms.

The mesio distal widths of all maxillary and mandibular teeth from right first molar to left first molar were calibrated with the use of a manual caliper.

There were 55 class I,38 class II division 1,21 class II division 2 and 21 class III.

The overall and anterior Bolton ratios for malocclusion group were compared with Bolton standard using students t-test Results : Significantly higher mean anterior tooth ratios were found for skeletal CL II \ 1 (p < 0.01) patients.

All other ratios were within close range of Bolton’s norms. Conclusions : Skeletal Class II patients showed a tendency towards higher mesio- distal widths of teeth in the maxillary anterior region.