Intra-rater Reliability of Facial Markers Placement Utilizing Moiré Topography: Pilot Study,
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Intra-rater Reliability of Facial Markers Placement Utilizing Moiré Topography: Pilot Study, RANIA R. MOHAMMED, MOHSEN M. EL SAYYAD, RAGYA M. KAMEL and NEVEEN ABDEL LATIF
Abstract
Objective: The purpose of this study was to test intra rater reliability of placement of facial markers for calculation of facial angles utilizing moiré topography.
Material and Methods: Twenty five healthy subjects were selected from both gender, They were participated in the study after signing institutionally approved consent form prior to data collection. Five facial angles were measured at both sides of the face which done by five muscles includes: (frontalis, orbicularis oculi, levator anguli oris, zygomaticus major, buccinators) after putting twenty two passive reflective markers made of plastic balls of 5mm in diameter on the face of the subjects then we asked each subject to raising eye brow then relax and after light eye closure then smiling then kissing and finally blowing to measure each angle two times at one day apart between each measurement by using Moiré Topography.
Results: There was a strong positive correlation between first and second readings for all the five angles of the face right and left side at one day apart measurements by using moiré topography as that the power of the measurements ranging from (r=0.74 to 0.84), these angles were including: (raising, light closing, smiling, kissing and blowing angles). For example raising right eye brow was (r=0.81, p=0.0001), for raising left eye brow was (r=0.84, p=0.0001), for light closing of right eye was (r=0.8, p=0.0001), for light closing of left eye was (r=0.81, p=0.0001).
Conclusions: There was a strong correlation between first and second reading of each angle of the five angles of the face that repeated two times at a separate one day by using moiré topography that is accurate and reliable methods to measure facial movements.