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KMID : 1157520230190040107
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International Journal of Clinical Preventive Dentistry
2023 Volume.19 No. 4 p.107 ~ p.111
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Comparison of Fitness of Metal Copings Manufactured by Wax Milling and 3D Printing
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Kim Nam-Joong
Park Seung-Min
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Abstract
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Objective: In this study, the coping was manufactured using wax milling and additive manufacturing using 3D printing (DLP) for a design with internal values set in a CAD program. Metal copings were manufactured through burial, recall, and casting of the processed copings using conventional methods, and the internal suitability was compared and evaluated.
Methods: The maxillary first molar was selected as an abutment test specimen model, and 35 abutment test specimens were produced with cemented carbide plaster. Wax coping was produced by cutting a wax block using a milling machine, and a castable resin pattern was produced using a printer. Burial, casting, and fitting were carried out according to traditionalmethods. Citing the silicon replica technique, the soft silicone thickness of the four cusps and the buccal and lingual margins was measured using the ‘2D cross-section’ function of the design program.
Results: Margin fitness was measured from 0.027 mm to 0.037 mm for the metal coping of wax milling and 0.025 mm to 0.034 mm for the metal coping of 3D printing. The inner spacing was measured from 0.095 mm to 0.239 mm for the metal coping of wax milling and 0.013 mm to 0.241 mm for the metal coping of 3D printing.
Conclusion: The spacing at the margins was less than 50 micrometers for both of metal copings using wax milling and 3D printing respectively. For the four cusp points, the inner spacing of the metal coping of 3D printing was narrower than the metal coping of wax milling.
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KEYWORD
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fitness, metal copings, wax milling, 3D printing
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