SANAL PLANLANMIŞ ORTOGNATİK CERRAHİ VAKALARDA FARKLI YÖNTEMLERLE ELDE EDİLMİŞ ÜÇ BOYUTLU YÜZ GÖRÜNTÜLERİNİN BAŞ POZİSYONUNUN REORYANTE EDİLEBİLİRLİĞİNE ETKİSİ

Abstract

ABSTRACT ERDOGAN, E. Effect of Three-Dimensional Facial Images Obtained with Different Methods on Reorientability of Head Position in Virtual Planned Orthognathic Surgery Cases. Hacettepe University Faculty of Dentistry, Department of Orthodontics, Specialization Thesis, Ankara, 2024. The aim of our methodological, non-invasive thesis study is to evaluate whether the method by which physicians virtually reconstruct patients' superficial facial soft tissues makes a difference in the obtain of natural head orientation. 42 virtually planned orthognathic surgery patients who met the inclusion criteria were included in the study. 42 patients were divided into 3 groups (A, B and C) according to the way their facial superficial soft tissues were created during the virtual orthognathic surgery planning process. Group A includes patients whose facial superficial soft tissues were created directly from cone beam computed tomography, group B includes patients whose cone beam computed tomography data were processed and whose surface features were improved, and group C includes patients whose three-dimensional facial photographs were used. Patients in all three groups were examined in the directions of movement in three planes of space (“pitch”, “roll”, “yaw”) using Dolphin Imaging Software (Version 11.95). The patients' natural head orientation values recorded with laser pointer and water gauge and used in surgery planning were recorded as the reference values of the study. The recorded values (‘’pitch’’, ‘’roll’’, ‘’yaw’’) were distrupted by generating numbers in the random number generator software of the Google search engine (Mountain View, California, USA). The new head orientation was attempted to be reoriented to the original head orientation with the help of the patient's frontal and profile photographs used in surgical planning. The ‘’pitch’’, ‘’roll’’ and ‘’yaw’’ values resulting from reorientation were compared with the initial values. According to our results, there is no statistically significant difference in terms of reorientation success between groups A, B and C. The movement with the highest reorientation accuracy in all three groups was "pitch". Keywords: Orthognathic surgery, natural head position, natural head orientation, virtual orthognathic surgery planning