TY - JOUR ID - 4596 TI - Effect of Zirconia Thickness on the Tensile Stress of Zirconia Based All-Ceramic Restorations JO - Journal of Dental Materials and Techniques JA - JDMT LA - en SN - 2322-4150 AU - Shiezadeh, Masood AU - Seyf, Mahdie AU - Rajati, Hamid Reza AU - Karazhian, Asadolah AU - Mohammadparast, Pouria AD - Assistant Professor, Dental Materials Research Center, Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Science AD - Associate Professor, Mashhad Dental Research Center, Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Science AD - Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Science AD - Department of Restorative dentistry, Faculty of Dentistry, Yazd University of Medical Science Y1 - 2015 PY - 2015 VL - 4 IS - 3 SP - 137 EP - 142 KW - Zirconia KW - Tensile stress KW - Laminate DO - 10.22038/jdmt.2015.4596 N2 - Introduction: The purpose of the presented study was to evaluate the effect of zirconia thickness on the tensile stress of zirconia based all-ceramic restorations. Methods: Twenty zirconia disks with 10mm diameter were prepared in two groups using CAD/CAM system. The thickness of zirconia was 0.5mm in first group and 0.3mm in second group. After sintering, 0.4mm glass ceramic porcelain was applied to each disk. Then, sintering and glazing of porcelain carried out. Instron testing machine with 1mm/min crosshead speed used to evaluate the failure load of the samples. Biaxial Flexural strength standard formula employed to calculate tensile stress of specimens. Statistical analysis performed using SPSS software. Results: Although data analysis showed more maximum tensile stress in 1st group, no significant differences were found between two groups. Conclusion: Zirconia with 0.5mm and 0.3mm thicknesses cause similar tensile stress in all-ceramic restorations and thickness of these laminates could be reduced to 0.7mm. UR - https://jdmt.mums.ac.ir/article_4596.html L1 - https://jdmt.mums.ac.ir/article_4596_1b5e26bf28c5b85d5f993eee274c8cb2.pdf ER -