Análisis de la posición del incisivo inferior según la Armonía Orofacial. Dentaimagen-2018.

Abstract

Introduction: The harmony of the orofacial complex depends of a state of balance between, its health, functionality and esthetics. (1) In orthodontics, the lower incisor and its position in the arch, are key for a right diagnosis. (2) It should be considered as well, factors that can modify the sagittal relations of the incisors.(5) The relevance of the lower incisor, as a reference to obtain a well-balance, harmonic dental occlusion; is a critical factor in orthodontic treatment. However, there are different opinions on its proper position. .(6) Objective: To determine the prevalence of the different positions that the lower incisor can adopt, using as a reference the IMPA angle (incisor mandibular plane angle) Materials and methods: The present article is a descriptive-transversal study. The sample consisted of 100 lateral cranial radiographs. The analysis of Ricketts, Steiner, Tweed and Holdaway were used to determine: facial biotype, skeletal class, facial profile, position of the lower incisor and proportion of the symphysis. Results: The most prevalent position of the lower central incisor (ICI), according to the facial biotype, was protruse, and the mesofacial biotype was the most prevalent in the study group. According to the different skeletal classes, it was obtained that in 52% of the Class I patients, IMPA was protruded; 74% of Class II patients presented a protruded IMPA; and finally 100% of the Class III patients, the ICI was within the established normal values. It was identified that, in patients who presented a good harmony of the lower third of the face, presented in 63% of the cases, normal values of the ICI. Conclusion: It was determined that, according to the population studied, the ICI was found most prevalent in a protruded position in the different facial biotypes, as well as, in Class I and II patients.