Relationship between tooth size discrepancies and malocclusion.

The main goal in comprehensive orthodontic treatment is to obtain optimal final occlusion, overbite and overjet. Tooth size discrepancies of the maxillary and mandibular arches is an important factor for achieving this goal. The aim of this study was to determine the relationship between the Bolton overall and anterior ratio and the relationship between first molars according to the Angle classification, and the size of overjet and overbite. The study sample consisted of 181 pretreatment dental casts with fully erupted and complete permanent dentitions from first molar to first molar, which were selected randomly. The evaluation of the Bolton anterior ratio showed that anterior ratio ranged between 66.038% and 96.907%, mean value - 77.889+/-4.296. The lowest mean value of the Bolton anterior ratio was in Angle Class II, and the highest - in Angle Class III, but this difference was not statistically significant. The evaluation of the Bolton overall ratio showed that the overall ratio ranged between 85.648% and 98.907%, mean value - 92.735+/-2.489. The lowest mean value of the Bolton overall ratio was in Angle Class II, and the highest - in Angle Class III, but this difference was not statistically significant. Moderate correlation was detected between the Bolton overall ratio and overjet (r=-0.45, p<0.001) The evaluation of the relationship between the Bolton overall ratio and overbite showed that a statistically reliable weak correlation (r=0.18, p<0.001). The evaluation of the Bolton ratio is clinically important and affects the planning of orthodontic treatment.