Volumetric comparison of maxillofacial soft tissue morphology: CT in the supine position versus three-dimensional optical scanning in the sitting position

Publication date: Available online 8 January 2018
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Yoshihiro Yamaguchi, Kensuke Yamauchi, Hikari Suzuki, Yuko Sai, Shinnosuke Nogami, Tetsu Takahashi
ObjectiveThree-dimensional (3D) surgical simulation has become popular, but the accuracy of such simulation is difficult to assess. Because maxillofacial soft tissue profiles vary with posture, we compared such profiles obtained in the supine and sitting positions.Study DesignIn total, 28 patients with skeletal class III jaw deformities underwent computed tomography (CT) in the supine position and 3D optical scanning in the sitting position. The two sets of 3D data were superimposed, and linear and volumetric differences were calculated. We evaluated the cheeks, the subauricular and infraorbital regions, the nose, the lips, and the chin. Statistical analyses were performed using paired Student's t-tests. Differences with P < 0.05 were considered to be significant.ResultsPatients were divided into three groups based on body mass index (BMI). The facial profiles of the cheeks and subauricular areas differed significantly between the sitting and supine positions. The extent of variation increased with BMI.ConclusionsWhen a patient moves from a sitting to a supine position, maxillofacial soft tissue migrates from the cheeks to the subauricular regions. Thus, simulations for surgery based on supine CT alone do not accurately model the cheeks and subauricular areas.



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