Abstract

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Title:: Effects of sagittal/vertical ratio of snore stopping device on condylar stress in patients with obstructive sleep apnea hypopnea syndrome

Author(s):: YIN Huanhuan1; YANG Xiaojing1; YANG Xianghong2; WU Wei1; WANG Rui2; 1. Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China 2. Department of Stomatology, Yanan Hospital Affiliated to Kunming Medical University, Kunming 650000, China

Keywords:: Keywords: condyle obstructive sleep apnea hypopnea syndrome finite element analysis snore stopping device

Abstract:: Abstract: Objective To construct a three-dimensional finite element model of the temporomandibular joint for exploring the effects of different mandibular sagittal/vertical ratios on the condylar stress in patients with obstructive sleep apnea hypopnea syndrome (OSAHS), and to find a suitable sagittal/vertical ratio of mandibular advancement snore stopping devices for the patients. Methods A three-dimensional finite element model of the maxillofacial system in the OSAHS patient was established for simulating different mandibular advancements and vertical displacements, thereby analyzing the stress distribution of the condyles. Results The maximum principal stress was the smallest when the vertical displacement of left mandibular condyle of the patient was 7.68 mm (64% of the largest mandibular advancement), and the corresponding vertical distance of the opening was 7 mm. The maximum principal stress was the smallest when the vertical displacement of the right mandibular condyle was 7.92 mm (66% of the largest mandibular advancement), and the corresponding vertical distance of the opening was 6 mm. Conclusion Through simulation analysis of the bilateral condyles, considering the balance of force on the left and right condyles, it is recommended that the vertical displacement of the mandibular in the patient should be 66% of the largest mandibular advancement, and the corresponding vertical distance of the opening should be 6 mm.