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KMID : 0362120190410010009
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Journal of Technologic Dentistry
2019 Volume.41 No. 1 p.9 ~ p.19
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Comparison the fit of three-unit metal framework fabricated by wax milling method and digital light projection method
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Lee Jung-Hwan
Ahn Jae-Seok
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Abstract
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Purpose: This study was conducted to comparative evaluate the marginal and internal gap of three-unit metal frameworks(Co-Cr) fabricated by wax milling method and digital light projection method of CAD/CAM systems.
Methods: All the specimens were fabricated by three different fabrication methods: conventional wax up with casting(CWC), milled wax block with casting(MWC), digital light projection with casting(DLPC) (n=10 each). The marginal and internal fits of specimens were examined using a replica technique. The light-body silicone thickness was measured at 8 reference points(each abutment: 16 measurements). All measurements were conducted by a stereomicroscope. Digital photo were taken at 150× magnification and then analyzed using a measurement software. The Mann-Whitney test was used for analyzing the results.
Results: Statistically significant differences were found between the fabrication methods(p<0.001). The mean(SD) is μm for fabrication methods, the mean marginal fit were recorded respectively, CWC 63(38), MWC group 50(33), DLPC 103(54) and the mean internal fit CWC 96(47), MWC group 116(41), DLPC 138(66).
Conclusion : The marginal and internal fit were statistically different according to the fabrication methods(p<0.001). In all fabrication methods, the greatest misfit was found the occlusal area of all specimens.
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KEYWORD
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Accuracy, Marginal and internal fit, Marginal discrepancies, Metal framework, Three unit substructure
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