Análisis de la distancia entre los dientes mandibulares posteriores y el borde wala en modelos digitales 3d

Abstract

The border index of Wala is an average measurement between the distance from the center of the clinical crown on the vestibular axis (AV point) and the Wala border, this border is a stable anatomic point of reference from the bone base of the dental arch, being the most prominent part of the jaw, immediately above of the mucogingival junction in the vestibular surface which is near of the horizontal rotation center of the dental piece, in the different dental pieces ( canines, premolars and molars) it establishes a reference point which serves to predict when an orthodontic procedure is finished and this way avoid complications such as recessions, fenestrations and dehiscence, dental extractions and recurrence. OBJECTIVE: To analyze the distance between posterior mandibular teeth and the Wala border in the diagnosed patients in the 3rd Cohort of the Orthodontics specialty from the University of Cuenca. MATERIALS AND METHODS: 61 digital models of inferior dental arch were analyzed, 36 were found to be diagnosed with class I malocclusion, 19 with class II malocclusion and 6 with class II malocclusion the pieces evaluated were from the canine all the way to second molars. The horizontal distance between the centers of the clinical crown of the vestibular axis (AV point) to the WALA border was measured using the Nemocast software. The average measurements obtained from the analyzed distances was thanks to the statistics program IBM SPSS statistics 25, while the sex and age of the patients was obtained from frequency rates. RESULTS: The horizontal distance from the FA point and the WALA border is for Class I malocclusion: canine 0.59mm; first premolar 0.67mm; second premolar 1.44mm; first molar 2.23mm; second molar 2.69mm; for class II malocclusion: canine 0.52mm; first premolar 0.55mm; second premolar 1.25mm; first molar 2.09mm; second molar 2.67mm; and for canine class III malocclusion 0.78mm; first premolar 0.82mm; second premolar 1.49mm; first molar 2.01mm, second molar 2.52mm. CONCLUSIONS: There is a progressive increase in the distance from the center of the crown (FA) to the WALA edge from the canine to the second molar in the different malocclusions. The WALA edge is a good point of reference to establish the morphology of individualized arches in Ecuadorian patients.