Evaluation of the prevalence of Andrews’s six keys to normal occlusion in untreated young brazilian normal occlusion

Liliana Ávila MALTAGLIATI, Luciana Andrade do Prado MONTES, Fernanda Marcondes Machado BASTIA, Silvana BOMMARITO

Aim: due to the large use of Andrews’s six keys to normal occlusion concept as a tool for diagnosis and treatment planning, we carried out this study with the purpose to evaluate the prevalence of such characteristics in a brazilian sample. Methods: 61 cast models of untreated subjects with normal occlusion were evaluated. The frequency that the six keys were found in each subject, as well as which were the most or least frequent keys, was observed. The results showed that most of the subjects presented one to three keys and none presented all the six keys. Results and Conclusions: the characteristics more frequently observed were: flat curve of Spee (100%), tight interproximal contacts (42,6%) and correct tippings (34.4%). The low prevalence of untreated normal occlusion that achieves Andrews’s requirements lead us to reflect on the search for such rigid patterns.

Keywords: Orthodontics. Dental occlusion. Normal occlusion.

Thursday, May 02, 2024 10:31