[IPROSI-4] Trueness of the obturator of the additive manufacturing complete denture with the obturator at different build angles
[Abstract]
[Objective]
Accuracy of the intaglio surface in additive manufacturing process for complete denture fabrication was examined using different build angles. However, the optimal build angle for maxillary prostheses with complex intaglio surface morphology, particularly those with protruding obturators, has not been examined. To clarify the accuracy of complete dentures including obturators fabricated by additive manufacturing, we aimed this study to assess its trueness at various build angles.
[Method]
A maxillary complete denture with a buccal flange obturator for a case of edentulous partial maxillectomy was evaluated. To retain the prosthesis, the obturator of this maxillary prosthesis was inserted into the undercut of the maxillary defect. A maxillary prosthesis created conventionally (referred to as the original denture) was scanned and duplicate dentures were then fabricated by additive manufacturing. We established eight different build angles for the additive manufacturing process: A build angle of 0° was defined as the intaglio surface of the maxillary prosthesis parallel to the build platform. The maxillary prosthesis was rotated in 45° increments from 0° to set angles of 45°, 90°, 135°, 180°, 225°, 270°, and 315°. The dentures fabricated by additive manufacturing were scanned and superimposed on the original denture using 3D data matching software, with artificial teeth as the reference for superimposition. Measurement focused on the entire base circumference of the obturator, which is crucial for closing the maxillary defect, and the point showing the largest deviation from the original denture was considered the representative value.
[Results and Discussion]
The discrepancy in obturator dimensions between the denture fabricated by additive manufacturing and the original denture was most pronounced at 90°, with a variance of −2.57 mm posterior to the obturator. Variances were noted throughout the obturator surfaces, with disparities, except at 0°, observed in the expansive undercut areas from the median side to the posterior side. These variations may arise from the polymerization shrinkage of the light-polymerizing resin because of its substantial volume within the undercut region of the obturator. In conclusion, the build angles influence the trueness of additive manufacturing denture obturators.
[Objective]
Accuracy of the intaglio surface in additive manufacturing process for complete denture fabrication was examined using different build angles. However, the optimal build angle for maxillary prostheses with complex intaglio surface morphology, particularly those with protruding obturators, has not been examined. To clarify the accuracy of complete dentures including obturators fabricated by additive manufacturing, we aimed this study to assess its trueness at various build angles.
[Method]
A maxillary complete denture with a buccal flange obturator for a case of edentulous partial maxillectomy was evaluated. To retain the prosthesis, the obturator of this maxillary prosthesis was inserted into the undercut of the maxillary defect. A maxillary prosthesis created conventionally (referred to as the original denture) was scanned and duplicate dentures were then fabricated by additive manufacturing. We established eight different build angles for the additive manufacturing process: A build angle of 0° was defined as the intaglio surface of the maxillary prosthesis parallel to the build platform. The maxillary prosthesis was rotated in 45° increments from 0° to set angles of 45°, 90°, 135°, 180°, 225°, 270°, and 315°. The dentures fabricated by additive manufacturing were scanned and superimposed on the original denture using 3D data matching software, with artificial teeth as the reference for superimposition. Measurement focused on the entire base circumference of the obturator, which is crucial for closing the maxillary defect, and the point showing the largest deviation from the original denture was considered the representative value.
[Results and Discussion]
The discrepancy in obturator dimensions between the denture fabricated by additive manufacturing and the original denture was most pronounced at 90°, with a variance of −2.57 mm posterior to the obturator. Variances were noted throughout the obturator surfaces, with disparities, except at 0°, observed in the expansive undercut areas from the median side to the posterior side. These variations may arise from the polymerization shrinkage of the light-polymerizing resin because of its substantial volume within the undercut region of the obturator. In conclusion, the build angles influence the trueness of additive manufacturing denture obturators.