Bolton analysis for different sagital problem and its corelation with dental parameters

The clinician should be familiar with discrepancies in tooth size at the initial diagnosis and treatment planning stages if excellence in orthodontic finishing is to be achieved. Bolton's method of diagnosing tooth size discrepancies by analyzing the mesiodistal tooth size ratio between the maxillary and mandibular teeth has been widely used in scientific studies since its publication. Aim of my study was to calculate Bolton Ratio and Anterior Bolton Ratio [1][,][2] for Different Skeletal Malocclusions i.e. Skeletal Class I, II and III. The study was also aimed at establishing correlation between Bolton's anterior and overall ratios and dental parameters i.e. upper and lower incisor inclinations and Arch length Discrepancy. The study was conducted on 60 subjects with mean age 18.43+4.21. Study models and lateral Cephalogram were taken for each subject. Patients were categorized in to Skeletal Class I,II and III. Bolton Analyses, Anterior Bolton Analyses, Arch length discrepancy for maxilla and mandible, UI-SN and IMPA were calculated and analyzed using SPSS version 13.It was concluded from the results that 1.Bolton Ratio though slightly different but was statistically insignificantly different in Skeletal Class I, II and II patients 2. Anterior Bolton Ratio though slightly different but was statistically insignificantly different in Skeletal Class I, II and II patients 3. Incidence of Anterior Bolton Ratio was more in Skeletal Class III cases than in Skeletal Class I and II 4. Statistically significant correlations between Arch length Discrepancy in Maxilla and intermaxillary tooth size discrepancies were determined. Therefore, an orthodontist should be aware of such discrepancies and their probable effects on occlusion and dental relations when solving the malocclusion jigsaw