Maxillary and mandibular incisor position and the skeletal sagital relationship: a correlation study

Carlos Alberto Gregório CABRERA, Marcos Roberto de FREITAS, Guilherme JANSON, José Fernando Castanha HENRIQUES

Aim: it was studied the behavior of the dentoskeletal relationship through the Wits appraisal and the acceptable variations of the maxillary and mandibular incisor buccolingual inclinations through different methods using teleradiographies and plaster models. Methods: the sample was comprised by teleradiographs in lateral norm and plasters models from fifty seven brazilian youths, divided in 26 male and 31 females. The age ranged from 15 years and 5 month old for the females and 16 years and 6 month old for the males, orthodontically treated by the Straight-Wire appliance, where a perfect occlusion was prioritized. Results: the normative value for Wits appraisal from this sample was -2.26mm (SD=1,83), showing no sexual dimorfism. Mean upper incisor inclination was +13,35º and mean lower incisor inclination was +5.14º, when cephalometric measurements were evaluated. From plaster models measurements, the mean inclination pattern for maxillary and mandibular incisor were +7.96º and +5,03º, respectivaly. Conclusion: it was found a significant correlation between skeletal sagital relationship and upper and lower inclinations.

Keywords: Cephalometric. Normal occlusion. Wits appraisal. Incisor.

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