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KMID : 1035320230500010069
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Korean Society for Dental Materials
2023 Volume.50 No. 1 p.69 ~ p.80
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Comparative study of surface characteristics and shear bond strength of 3D printed and milled 4Y-TZP
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Kyung Kyu-Young
Koak Jae-Young
Kim Seong-Kyun
Park Ji-Man
Heo Seong-Joo
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Abstract
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This study aimed to compare the surface characteristics and the shear bond strength of veneering porcelain of 3D printed4Y-TZP with milled 4Y-TZP. Thirty disks with 10 mm diameter and 1.2 mm thickness were fabricated. Fifteen were fabricatedby 3D printing (Experimental Group), and another 15 by milling (Control Group). In each group, five were assigned to surfaceanalysis. Surface roughness was measured using a confocal laser microscope. Surface energy was calculated by measuring thecontact angles of water and diiodo-methane with a drop-shape analyzer.
Another ten specimens were used to evaluate the shear bonding strength of veneering porcelain on the surface of 4Y-TZP.
The surface of 3D-printed 4Y-TZP was very smooth, and the surface roughness (Ra, Rq) was significantly lower than that ofmilled 4Y-TZP (p<0.001). 3D-printed 4Y-TZP showed low wettability compared with milled 4Y-TZP, i.e., the water contactangle was significantly high (p=0.008), and the surface free energy was low (p=0.008). The shear bond strength to veneeredporcelain of 3D printed 4Y-TZP was significantly lower than that of milled 4Y-TZP (p<0.001). The surface characteristics of4Y-TZP were quite different by the manufacturing process. The smooth surface and low wettability of 3D-printed 4Y-TZP couldaffect its low shear bonding strength to veneering porcelain.
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KEYWORD
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Y-TZP, 3D printing, CAD-CAM, Surface roughness, Shear bond strength
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