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KMID : 0362120180400040209
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Journal of Technologic Dentistry
2018 Volume.40 No. 4 p.209 ~ p.215
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Evaluation the clinical acceptability of the marginal and internal gaps of fixed partial denture fabricated with additive manufacturing technology
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Kim Jae-Hong
Kim Ki-Baek
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Abstract
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Purpose: The purpose of this study was to evaluate the clinical acceptability of the marginal and internal gap of Co-Cr metal copings fabricated with stereolithography (SLA).
Methods: Titanium master dies were milled after scanning of the prepared tooth (n=30). For group I, Co-Cr metal copings were made from conventional lost-wax technique(LWT, n=10). For group II, the master dies were scanned and designed with CAD system. Then, metal copings were milled with Co-Cr(SUB, n=10). For group III(ADD, n=10), the scanning and design procedures were same as group II and burn-out resins were fabricated with SLA device. The marginal and internal discrepancies were measured under an optical microscope(100x) on ten reference points and were statistically analyzed with one-way ANOVA(α=.05).
Results: The mean total discrepancies were 53.76±12.42μm in the LWT group and 69.82±15.48μm in the ADD group. The SUB group showed the largest total mean value 110.33±13.77μm. There was statistically significant difference between the SUB and the other groups(P<0.05).
Conclusion : Co-Cr metal copings fabricated with SLA technology showed clinically acceptable value on marginal and internal gap and there was no statistically significant difference between conventional lost-wax technique and SLA.
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KEYWORD
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Stereolithography, Rapid prototyping, Marginal and internal fit, Metal ceramic crown
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