Evaluation of the effect of surgically assisted rapid maxillary expansion on the characteristics of nasal airflow

doi:10.19438/j.cjoms.2018.03.009

Abstract

Abstract: PURPOSE: To study the effect of surgically assisted rapid maxillary expansion on nasal airflow dynamics by computer numerical simulation. METHODS: The sample comprised 8 adult patients with maxillary transverse deficiency. They had unilateral or bilateral posterior teeth crossbite. Spiral CT scans were taken before treatment(T1) and 3 months after expansion(T2). The three-dimensional model of the upper airway was established by using Mimics10.0 software, and the analysis of computational fluid dynamics was simulated by ANSYS14.0 software in order to obtain the airflow velocity, the nasal cavity pressure, the cross-sectional area of nasal cavity, nasal airway volume and resistance. The nasal airflow parameters were analyzed with SPSS16.0 software package for paired t test, respectively. RESULTS: The whole nasal velocity was tended to be stable after expansion, and it decreased significantly compared with that before expansion(P<0.05). There was more turbulent flows formation in the nasal airway preoperatively than postoperatively. The absolute value of nasal negative pressure decreased after expansion(P<0.05). The cross-sectional area of nasal cavity and nasal volume increased, while the nasal airway resistance decreased significantly after expansion (P<0.05). CONCLUSIONS: Surgically assisted rapid maxillary expansion has certain effect on nasal airway morphology and airflow dynamics, which is beneficial to the improvement of nasal airway ventilation function.

Key words: Surgically assisted rapid maxillary expansion, Nasal airway, Computational fluid dynamics

CLC Number:

R782.2

NIE Ping, TAO Li, SUN Hui-jun, YU Qian, ZHU Min.. Evaluation of the effect of surgically assisted rapid maxillary expansion on the characteristics of nasal airflow[J]. China Journal of Oral and Maxillofacial Surgery, 2018, 16(3): 237-241.

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