Midsagittal Plane First: Building a Strong Facial Reference Frame for Computer-Aided Surgical Simulation.
J Oral Maxillofac Surg
; 80(4): 641-650, 2022 04.
Article
em En
| MEDLINE
| ID: mdl-34942153
ABSTRACT
PURPOSE:
A facial reference frame is a 3-dimensional Cartesian coordinate system that includes 3 perpendicular planes midsagittal, axial, and coronal. The order in which one defines the planes matters. The purposes of this study are to determine the following 1) what sequence (axial-midsagittal-coronal vs midsagittal-axial-coronal) produced more appropriate reference frames and 2) whether orbital or auricular dystopia influenced the outcomes.METHODS:
This study is an ambispective cross-sectional study. Fifty-four subjects with facial asymmetry were included. The facial reference frames of each subject (outcome variable) were constructed using 2 methods (independent variable) axial plane first and midsagittal plane first. Two board-certified orthodontists together blindly evaluated the results using a 3-point categorical scale based on their careful inspection and expert intuition. The covariant for stratification was the existence of orbital or auricular dystopia. Finally, Wilcoxon signed rank tests were performed.RESULTS:
The facial reference frames defined by the midsagittal plane first method was statistically significantly different from ones defined by the axial plane first method (P = .001). Using the midsagittal plane first method, the reference frames were more appropriately defined in 22 (40.7%) subjects, equivalent in 26 (48.1%) and less appropriately defined in 6 (11.1%). After stratified by orbital or auricular dystopia, the results also showed that the reference frame computed using midsagittal plane first method was statistically significantly more appropriate in both subject groups regardless of the existence of orbital or auricular dystopia (27 with orbital or auricular dystopia and 27 without, both P < .05).CONCLUSIONS:
The midsagittal plane first sequence improves the facial reference frames compared with the traditional axial plane first approach. However, regardless of the sequence used, clinicians need to judge the correctness of the reference frame before diagnosis or surgical planning.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Imageamento Tridimensional
/
Pontos de Referência Anatômicos
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article