Accuracy Assessment of a Three-Dimensional Virtual Soft Tissue Simulation System in Predicting Surgery Outcome for Class III Patients
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Abstract
Current orthodontic theory and practice are primarily based on improving facial esthetic appearance. Patients with exaggerated soft tissue features originating from severe skeletal discrepancies are appropriate candidates for surgical-orthodontic treatment. Three-dimensional simulation of soft tissue changes prior to actual operation is available as a prediction method to estimate possible treatment outcomes, although the accuracy of such methods remains ambiguous. The objective of this study was to assess the accuracy of virtual soft tissue simulation performed using a 3D system. Fifteen patients with skeletal class III relationship were included in the study. Pre-surgical records (CBCT, model scan, 3D face) were gathered within 1 month before surgery in order to set up the simulation model (T1). Three months after surgery, post-surgical records (CBCT, 3D face) were collected to create the actual model (T2). Distances and angular variables were measured on both models, and the differences between T1 and T2 were then analyzed. The results showed statistically significant differences (P<0.05) in terms of frontonasal angle, nose length, nasolabial angle, upper alar width, lip-chin-throat angle, lower lip length, soft tissue chin thickness, and throat length. The ability of Dolphin 3D software to simulate soft tissue features in class III surgery cases differed depending on the area of the face. Highly accurate areas were midface, upper lip, lower lip, and the lower part of the nose. Soft tissue chin thickness was found to be moderately accurate. However, simulations of the upper part of the nose should be considered with caution. The most inaccurate simulations were of the nasolabial angle, lip-chin-throat angle, and throat length.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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