Mohammed Thamir Yassin
School of Dentistry, University of Sulaimani, IraqPublications
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Research
The effect of clinical sandblasting with different powders on the surface roughness of cores for metal-ceramic crowns and their fracture resistance after the addition of repair material
Author(s): Mohammed Thamir Yassin* and Shatha Abdullah Salih
Background/ purpose: The most frequently encountered issue with metal-ceramic restorations is the fracture of veneering porcelain. This in vitro study aims to evaluate the effect of clinical sandblasting with 50 μm aluminum oxide and 30 μm silica-coated particles on the surface roughness of metal cores and the subsequent effect on their fracture resistance after the addition of specific adhesive and packable composite as a repair material. Materials and Methods: Metal cores (n=21) were digitally designed and three-dimensionally printed by selective laser melting technique by ProX 100 3D printer (3D Systems, Inc). These cores were randomly divided into three groups: Group A: n=8, sandblasted with 50 μm aluminum oxide, and veneered with packable Z350 composite. Group B: n=8, sandblasted with 30 μm silica-coated particles and veneered with packable Z350 composite. Group C: co.. Read More»