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KMID : 0362120170390010035
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Journal of Technologic Dentistry
2017 Volume.39 No. 1 p.35 ~ p.42
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Three-dimensional evaluation of the internal adaptation of single and three-unit fixed dental restoration by CAD/CAM milling system
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Kim So-Ri
Kim Chong-Myeong
Kim Woong-Chul
Kim Ji-Hwan
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Abstract
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Purpose: The purpose of this paper was to evaluate the occurrence of errors regarding adaptation by conducting a three-dimensional assessment comparing the bridge type dental restoration after the cutting process, which has multiple abutments, with a single type dental restoration.
Methods: By using ten identical files obtained by scanning the master model, thirty designs were created consisting of
ten maxillary right first premolars and ten maxillary right first molars with single crown abutments, along with ten bridge
designs with the identical abutment. A 5-axis milling machine was used to produce the design file. The produced denture
prostheses were scanned using a silicone replica for a STL file. An evaluation was conducted using 3D analysis software on the master model and each of the thirty data files.
Results: The RMS value of the pre-molar (14) was 38.4 ± 4 μm for single and 54.7 ± 6 μm for bridge abutment; therefore, a statistically significant difference was observed for single and bridge designs although both shared the same abutment form (P<.05). Also, the RMS value of the molar (16) was 47.6 ± 2 μm and 56.6 ± 5 μm for the single and bridge designs, respectively, thereby presenting a statistically significant difference (P<.05).
Conclusion: As a result, dental prosthesis fabricated using the single method presented better internal adaptation outcomes.
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KEYWORD
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CAD/CAM system , Milling system , Three-dimensional evaluation , Gap , Three-unit fixed dental restorations
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