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Lower Facial Angle and its Correlation with the Height and Depth of the Face in the Determination of the Vertical Dimension of Occlusion

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EAO-2018

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Abstract

Background Recording vertical dimension in the edentulous patient has been for years a controversial issue and is one the most challenge points in prosthodontics, both conventional and over implants. Aim/Hypothesis To evaluate the lower facial angle and the height and depth of the face by means of cephalometry, with the objective to contribute with more elements to the vertical dimension record. Materials and Methods 150 edentulous patients were randomly selected from the Clinic of Total Prosthesis of the Department of Prosthodontics A. (National University of La Plata, Argentina). All patients received conventional complete prosthesis and were satisfied with the results both functional and aesthetically. After that, the following measures were recorded: Extra-orally: External eye angle – Labial commissure #M1 and Base of the Nose – Chin #M2. Cephalometric measurements were recorded: Lower facial angle, Depth of the face and Height of the face. Correlation of the Lower facial angle with the other variables was searched. Results Extraoral measurements were: M1: 6.98 cm (0.44) and M2: 6.74 cm (0.47). Lower facial angle: 49.98 degrees (4.55). Depth of the face: 6.38 cm (0.83). Height of the face: 6.41 cm (1.13). Correlations were found between Lower facial angle with Height of the face – with a direct relationship (p<0,001) and with the Depth of the face, with a inverse relationship - (p<0,001). No correlations were found with extraoral measurements M1 and M2. With the data obtained, and based on trigonometry, we created a formula to obtain the vertical dimension in a more predictable manner. 1) The lower facial angle, alpha, is considered as two angles: alpha1 and alpha2. 2) The depth of the face is H, and the height of the lower facial third is considered Y. Based on that, the formula is: Y = H × (tan (alpha1) + tan (alpha2)) Which means that the Vertical Dimension is equal to the Depth of the Face multiplied by the sum of the tangents of the two sub angles that make up the Lower Facial Angle. Conclusions and Clinical Implications Within the limits of the present study, we can conclude that a 49 angle could be a good starting point for vertical dimension record. A protocol is proposed for the evaluation of the vertical dimension during the wax base plate test, prior to teeth try out, where the necessary adjustments can be made, based on the formula described in the present work. The vertical dimension record using the cephalometric analysis of the lower facial angle may result in a method of better clinical precision.

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© Copyright 2020 Morressier GmbH.
All rights reserved.