Facial anthropometrics landmarks used to obtain the occlusal vertical dimension - a stereophotogrammetry study

• Ano de defesa: 2022
• Autor(a) principal: Caballero, Jorge Tomasio
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Dimensão vertical; Fotogrametria; Imagem; Imaging; Mouth rehabilitation; Photogrammetry; Reabilitação bucal; Three-dimensional; Vertical dimension
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/25/25146/tde-18112022-115010/

Restoring the occlusal vertical dimension (OVD) in occlusal imbalance, multiple dental absences, and severe wear is essential to achieving satisfactory oral rehabilitation. Despite several methods to determine the OVD, there is no single and precise. The present study aimed to use stereophotogrammetry to assess the relationship between facial measurements and compare metrics techniques to obtain OVD among individuals aged ranging 20 to 65 years. The analysis was performed on 186 patients divided into four groups: G1 - 46 patients aged between 20 and 30 years; G2 - 35 patients aged 31 to 40 years; G3 - 50 patients aged 41 to 50 years; G4 - 55 patients aged 51 to 65 years. Relevant anthropometrics landmarks relationship to OVD were pointed on the face, and 3D images were obtained using the Vectra H1 (Canfield Scientific, Inc, Fairfield, NJ, USA) portable stereophotogrammetry camera system. The linear measurements were measured by VAM elaboration software (Canfield Scientific, Inc). Linear regression analysis was performed to evaluate the relationships between the measurements of the lower third of the face (Sn-Gn and Prn-Pg). The ANOVA was applied to compare the Sn-Gn measurements with the measurements from the outer corner of the eyes to the straight lines of the commissures in the vertical direction (Exo R/L-Ch\'R/L) in the evaluated groups. P < .05 was considered significant. Through multiple linear regression, 13 linear measures predictive of OVD were evaluated, and only four were considered statistically significant for the Sn-Gn model: Exo R Ch\' R; ExoL EndL x2; EndR EndL x2 and sex. For the Prn-Pg model, three independent variables showed a statistically significant difference: Exo R-Ch\' R; Exo L-Ch\'L, and Exo L-End Lx2. The ExoR-Ch\'R and ExoL-EndoLx2 predictors significantly impact the OVD through stereophotogrammetry. Comparing the groups (ANOVA) and the Sn-Gn measurements concerning the outer corner of the eyes (ExoR/L) and the straight line of the commissure (Ch\'R/L) and the pupil (PupilR/L) and the straight line of the commissure (Ch\'\'R/L), both vertically, the results showed a statistically significant difference in all measurements except PupilL-Ch\'\'L. It is concluded that the Willis method, which establishes the measurement from the outer corner of the eye to the straight line of the commissure as a method to obtain the OVD, only has relevance in the measurement of the pupil to the left straight line of the commissure (PupilL/Ch\'L). Not finding support in the other measures to establish OVD with stereophotogrammetry.