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Assessment of inlay ceramic restorations manufactured using the hot-pressing method

대한치과기공학회지 2020년 42권 1호 p.9 ~ 16
이범일 ( Lee Beom-Il ) - Korea University College of Health Science Department of Dental Laboratory Science & Engineering

유승규 ( You Seung-Gyu ) - Korea University College of Health Science Department of Dental Laboratory Science & Engineering
유승민 ( You Seung-Min ) - Korea University College of Health Science Department of Dental Laboratory Science & Engineering
박동인 ( Park Dong-In ) - Korea University College of Health Science Department of Dental Laboratory Science & Engineering
김지환 ( Kim Ji-Hwan ) - Korea University College of Health Science Department of Dental Laboratory Science and Engineering

Abstract


Purpose: The purpose of this study was to compare the marginal and internal fit of lithium disilicate ceramic inlay produced by heat pressing that inlay pattern made by subtractive manufacturing and additive manufacturing method.
Methods: A mandibular lower first molar that mesial occlusal cavity (MO cavity) die was prepared. After fabricating an epoxy resin model using a silicone impression material, epoxy resin die was scanned with a dental model scanner to design an MO cavity inlay. The designed STL pile was used to fabricate wax patterns and resin patterns, and then lithium disilicate ceramic inlays were fabricated using hot-press method. For the measurement of the marginal and internal gap of the lithium disilicate, silicone replica method was applied, and gap was measured through an optical microscope (x 80). Data were tested for significant differences using the Mann-Whitney Utest.

Results: The marginal fit was 103.56±9.92㎛ in the MIL-IN group and 81.57±9.33㎛ in the SLA-IN group, with a significant difference found between the two groups (p<0.05). The internal fit was 120.99±17.52㎛ in the MIL-IN group and 99.18±6.65㎛ in the SLA-IN group, with a significant difference found between the two groups (p<0.05).

Conclusion: It is clinically more appropriate to apply the additive manufacturing than subtractive manufacturing method in producing lithium disilicate inlay using CAD/CAM system.

키워드

Additive manufacturing; Internal; Lithium Disilicate; Marginal; Silicone replica; Stereolithography apparatus
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