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KMID : 1812820220050010013
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Journal of Korean Dental Hygiene Science
2022 Volume.5 No. 1 p.13 ~ p.19
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Marginal and internal fit according to the shape of the abutment of a zirconia core manufactured by computer-aided design/computer-aided manufacturing
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Kim Ji-Su
Ryu Jae-Kyung
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Abstract
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Background: In this study, zirconia copings were fabricated by setting clinically acceptable inner values for prostheses using computer-aided design/computer-aided manufacturing (CAD/CAM). The processed copings were evaluated for the marginal and internal fit of each abutment shape with a CAD program using the silicone replica technique. Methods A total of 20 copings was produced by selecting models commonly used in clinical practice. After injecting the sample, the minimum thickness, internal adhesion interval, and distance to the margin line were set to 0.5, 0.05, and 1.00 mm using a dental CAD program, respectively. It was measured using a 2D section function in a threeway program of the silicon replication technology. Although the positions and number of measurements of the anterior and posterior regions differed, nine parts of each pre-tube were designated and measured by referring to a previous study to compare the two samples. Results As a result, the average margin of the mesial, distal, and buccal (labial) surfaces was 59.90 μm in the anterior region and 60.40 μm in the posterior region. The mean axial wall margin was 67.25 μm in the anterior region and 69.25 μm in the posterior region. In occlusion, the anterior teeth (77.70 μm), posterior teeth (77.60 μm), and both anterior and posterior regions were within the clinically acceptable range. Conclusion The edge and inner fit of zirconia coping manufactured using the CAD/CAM system showed clinically applicable results. To reduce errors and increase accuracy, materials and machine errors that affect the manufacture of prosthetics should be investigated. Based on our results, the completeness of prosthetics could increase if the inner value and characteristics of the material are adjusted when applied in clinical practice.
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KEYWORD
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Zirconia, Copping suitability, CAD/CAM
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