Banca de QUALIFICAÇÃO: FELIPE ALEXANDER CALDAS AFONSO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : FELIPE ALEXANDER CALDAS AFONSO
DATE: 30/07/2020
TIME: 15:00
LOCAL: PLATAFORMA REMOTA
TITLE:

COMPARATIVE STUDY OF THE HEAD ORIENTATION METHODS UTILIZING A VARIETY OF SOFTWARES TO THE 3D VIRTUAL PLANNING OF ORTHOGNATHIC SURGERIES

KEY WORDS:

Orthognathic Surgery; Simulation; Facial Asymmetry

PAGES: 20
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Cirurgia Buco-Maxilo-Facial
SUMMARY:

INTRODUCTION The 3D virtual planning represents a paradigm change in the treatment of the dentofacial deformities. However, the best method of Neutral Head Position (NHP) acquisition still controversial. There is a leak of comparative studies to the evaluation of the accuracy of these methods. OBJECTIVE This article aims to evaluate the discrepancy degree between the NHP methods virtually using a variety of software. MATERIAL AND METHODS Four patients with dentofacial deformities were included in the analysis. For each patient was submitted to all the following NHP acquisition protocols: Procrustes Method – Primal Sagittal Plane (pilot group); The modified Charlotte Method; and the Photographic Method of the Universal Protocol. Cone-beam computerized tomography with centric relation bite jig was requested, and impressions of the dental arches were performed to the 3D scanning. Then, the composite skulls were oriented in NHP in the following software: (1) Anatomic Aligner (Houston Methodist Research Institute – HMRI – Texas, USA); (2) Dolphin Imaging (Chatsworth, CA, USA); (3) OrtogOnBlender (Blender Foundation, Amsterdam, NL). The discrepancies were evaluated by the superimposition of the craniofacial 3D models, using the centroid as a reference to the linear and angular measurements. RESULTS For the cases analyzed in this pilot study, the obtained angular values are in the literature preconized limits as excellent (angular discrepancy inferior to 4°), being the highest orientation discrepancy of 2,49°, considering all the oriented composite skulls. However, for both evaluated methods, the obtained linear values were not in the literature preconized limits (linear discrepancy inferior to 2mm) in some reference axes. The modified Charlotte Method was obtained higher than the preconized value in the Z-Inferosuperior axis (2,31mm). The photographic method of the Universal Protocol was obtained higher than preconized values for the Y-Anteroposterior (2,51mm) and Z-Inferoposterior (3,17mm) axes. DISCUSSION The authors consider that when the preparation and orientation of the composite skulls are performed in a well-controlled environment by specialized and capable professionals of the surgical field, all the techniques for the NHP orientation can be useful, precise and valid to the desired result. It is because this preparation is based on the facial analysis and clinical data that is collected by the surgeon. However, some methods will have a more straightforward execution, and others will be slightly more precise. Also, the authors remember that the linear discrepancies obtained in the X, Y, and Z axes in the study are expected, once that the 3D virtual simulation software varies in the spatial positioning between them, and it is maintained only the head orientation of each patient. So, the angular spatial orientation the aspect with a higher importance in this evaluation method of accuracy. CONCLUSION The final results in this pilot study will be of great importance to provide to the surgeons a better evaluation about which NHP technique is the most adequate for the treatment of the patients with dentofacial deformities, always considering the following aspects that facilitate the clinical day-to-day of the surgeon: execution simplicity and less waste of time.

BANKING MEMBERS:
Presidente - 2379951 - ADRIANO ROCHA GERMANO
Externo ao Programa - 3318536 - JOSE SANDRO PEREIRA DA SILVA
Externo à Instituição - JOSÉ RODRIGUES LAUREANO FILHO - UPE