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KMID : 1157520230190040094
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International Journal of Clinical Preventive Dentistry
2023 Volume.19 No. 4 p.94 ~ p.98
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Comparison of Inner Fitness of Crown Prosthesis Manufactured by 3D Printers Based on Lamination Thickness
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Kim Nam-Joong
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Abstract
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Objective: In this study, crowns were manufactured by lamination at three thicknesses of 0.01 mm, 0.05 mm, and 0.10 mm to determine the difference in internal fit of crowns according to lamination thickness using a 3D printer that has been widely used recently. We aim to obtain clinically meaningful results by measuring, comparing, and evaluating the internal fit of crowns printed with different thicknesses.
Methods: The maxillary first molar was selected as the abutment test specimen model. Scan the model with a scanner and design the crown with a dental design program. The designed crown is printed and manufactured with photocurable 3D printing resin. The printed crown is cleaned using an ultrasonic cleaner and cured with a light curing machine. The manufactured crown was scanned and the spacing was measured by fitting the scanned data to the model.
Results: The average value of the overall gap was 0.027 at 0.01, 0.034 at 0.05, and 0.039 at 0.10, with the smallest gap at 0.01, the thinnest stack thickness. The maximum value was 0.061 at 0.10 and the minimum value was 0.011 at 0.01. By measurement location, LM had the smallest gap from 0.01 to 0.032 and the largest from 0.10 to 0.048. The smallest gap was found at Occ, and the gap increased toward the margins.
Conclusion: It was found that the thinner the lamination thickness, the better the internal fit of the dental prosthesis, and the size of the position-specific gap increased from the occlusal surface to the margins. Among them, LM, Occ, and BM had statistically significant differences only at 0.01 and 0.10, LW showed no significant differences, and BW showed no significant differences at 0.05 and 0.10.
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KEYWORD
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3D printer, lamination thickness, inner fitness
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