Vestibulum-palatine position of first permanent maxillary molars in class I skeletal individuals by CBCT

Abstract

Foundations: For Orthodontics the quantitative contribution that can give the inclinations of the teeth at the end of the treatment has relevance, for example, with age, the vestibulum-palatine inclinations of the molars vary in relation to the width of the intermolar arch, where studies indicate that the maxillary and mandibular molars are more vertical while there is an increase in the widths in the intermolar arches. According to the literature, there is little information on the inclination values of the first molars in adult patients. Objective: The purpose of this study was to investigate by means of complete skull tomography the degree of vestibulum-palatine inclination of the first maxillary permanent molars in individuals with class I skeletal. Methods: We analyzed 120 ct scans of the complete skull (64 belonging to women and 56 to men) chosen by a sample at convenience by selection criteria. CBCTs (cone beam computed tomography) were obtained using a Newton Tomography GI-EVO Multislice CT scan (Cone Beam). Results:  The average of the inclinations in both male and female gender was for the first right upper molar of 94.03° ± 6.64, for the first left upper molar the average was 95.26° ± 5.40. And the overall average vestibulum-palatine inclination of the first right and left upper molar was 94.65° ± 6.02. Therefore, values above 100.67° indicated an oral or vestibular inclination of the upper first molar and values below 88.63° indicated a palatal inclination.  Conclusions: The vestibule-palatine inclination of the first maxillary molars was 94.65° with standard deviation ± 6.02, as a reliable measure by the horizontal reference (Frankfurt plane) that indicates the adequate and stable angulation that should have for the completion of an optimal orthodontic treatment.