Evaluation of the dental arch asymmetry in natural normal occlusion and Class II malocclusion individuals

Paulo Estevão SCANAVINI, Luiz Renato PARANHOS, Fernando César TORRES, Maria Helena Ferreira VASCONCELOS, Renata Pilli JÓIAS, Marco Antonio SCANAVINI

Objective: To verify the presence and degree of asymmetry of dental arches in Brazilian individuals with natural normal occlusion and Class II, Divisions 1 and 2 malocclusions. Methods: The study evaluated the symmetry of the maxillary and mandibular dental arches of 180 pairs of dental casts, divided into: Group I = 60 pairs of natural normal occlusion individuals; Group II = 60 pairs of Class II, Division 1 malocclusion individuals; and Group III = 60 pairs of Class II, Division 2 malocclusion individuals. A device was used to measure dental midline deviation and the canine tip in the dental arches (in degrees). It was also verified the distance of the upper canines from the palatal suture, intercanine distance, and anteroposterior upper and lower first molar position. Results: Dental arches of individuals from all groups presented asymmetry, regardless of the presence of malocclusion. Group I showed a lower asymmetry degree in relation to Groups II and III. The asymmetry in Groups II and III was similar. Conclusion: The dental arches of individuals with natural normal occlusion and with Class II, Division 1 and Division 2 malocclusions showed asymmetry. The asymmetry degree was higher in the mandibular dental arches than in the maxillary dental arches in all 3 evaluated groups.

Keywords: Dental arch. Abnormalities. Growth and development. Anatomy and histology. Malocclusion.

How to cite: Scanavini PE, Paranhos LR, Torres FC, Vasconcelos MHF, Jóias RP, Scanavini MA. Avaliação de assimetria das arcadas dentárias de indivíduos com oclusão normal natural e com má oclusão Classe II. Dental Press J Orthod. 2012 Jan-Feb;17(1):125-37.

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