Three-dimensional analysis of posterior tooth inclinations in transverse and sagittal relationships: A cross-sectional study

Objective > To compare tooth inclinations in different sagittal skeletal patterns and transverse maxillary relationships three-dimensionally.Methods > A cross-sectional study carried out with 132 three-dimensional digital models in the complete permanent dentition divided into six groups (n = 22); three groups with maxillary atresia: G1-skeletal class I, G2-skeletal class II and G3-skeletal class III; three groups without maxillary atresia: G4-skeletal class I; G5-skeletal class II and G6-skeletal class III. The comparison between the skeletal pattern was performed by the non-parametric tests of Kruskal Wallis and Dunn and between the groups by the non-parametric test of Mann Whitney.Results > Subjects with skeletal class II and maxillary atresia had a greater lingual inclination of the maxillary teeth than those with class I and III; Subjects with skeletal class II without atresia had a less lingual inclination of the mandibular molars than the other classes (p < 0.05). The maxillary premolars showed no variation in dental inclination with atresia, independent of the skeletal class in G1, G2, and G3 (p > 0.05). The mandibular premolars showed that the groups without atresia G4, G5, and G6 presented no significant difference (p > 0.05). Lower premolars in skeletal class III malocclusion individuals with atresia had a more negative inclination than the others.Conclusion > There is a difference in the inclination of posterior teeth between individuals with and without maxillary atresia and skeletal classes I, II, and III.

Automated summary

The study found that individuals with skeletal class II and maxillary atresia have greater lingual inclination of maxillary teeth, while those with skeletal class II without atresia have less lingual inclination of mandibular molars. Lower premolars in skeletal class III malocclusion individuals with atresia show a more negative inclination compared to others.