Abstract
Computer-aided design and manufacturing is widely used in clinical practice. This technology may change existing methods for mandibular fracture management. The purpose of this in-vitro study was to determine if the reduction for mandibular symphysis fracture is performed without maxillomandibular fixation (MMF) using 3-dimensional (3D)-printed template. This was an in-vitro study and had the character of a proof-of-concept study. The study was planned using the existing 20 pairs of intraoral scan and computed tomography data. The mandibular model STL file was created by merging the STL file obtained for the bimaxillary dentitions with the computed tomography DICOM file, and this was set as the original model. In the original model, STL file of fracture model of mandibular symphysis was created using computer-aided design. A template similar to a wafer or an implant guide was manufactured from restoring the own occlusion, and the mandibular fracture model was reduced and fixed using the 3D-printed template and wire, and this was set as the experimental group. The 3D coordinate system error was measured at 6 landmarks and statistically compared using scan data between models of the groups. Reduction techniques with MMF or without MMF using guide template for mandibular fracture model. The 3D coordinate system error (mm). The position of landmarks. The Mann-Whitney U test, student's t-test, and the Kruskal-Wallis test were used to analyze the coordinate errors between the landmarks. A P value of < .05 was considered statistically significant. The 3D error value of the control and experimental group were 1.06±0.63mm (range: 0.11 to 2.92mm) and 0.96±0.48mm (range: 0.2 to 2.95mm), respectively. There was no statistical difference between the control and experimental group. There was a statistically significant difference in the lower 2 and lower 3 landmarks compared to the upper 1 (P=.001 and .000, respectively) before and after the reduction in the experimental group. This study demonstrates that the reduction using a 3D-printed guide template for the mandibular symphysis fracture could be possible even without the MMF.
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