Affiliations: Oral Implantology and Regenerative Dental Medicine, Tokyo Medical and Dental University, Tokyo, Japan | Global Center of Excellence Program, Tokyo Medical and Dental University, Tokyo, Japan | Department of Metals, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo, Japan | International Apatite Institute, Tokyo, Japan
Note: [] Corresponding author: Srilatha Bhargava, Oral Implantology and Regenerative Dental Medicine, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Tel.: +81 3 5803 4664; Fax: +81 3 5803 4664; E-mail: [email protected].
Abstract: Surface modification techniques affect phase transformation which in turn influences strength of zirconia biomaterial. The study aimed at evaluating the tetragonal to monoclinic (t–m) phase transition of zirconia occurring after sandblasting three different ceramic abrasive materials and its subsequent effect on the strength. Zirconia bars (n=24) were sandblasted using silicon carbide (SiC), alumina (Al2O3) and zirconia (ZrO2) particles. After surface characterization by a scanning electron microscope (SEM) and a laser profilometer, the relative amount of transformed monoclinic (m) phase was analyzed by X-ray diffractometry (XRD) and its corresponding effect on the flexural strength and fatigue strength were determined. Data were analyzed using one-way analysis of variance ANOVA (p<0.05). Furthermore, Weibull statistics was used to analyze the variability of flexural strength. The highest amount of monoclinic content was found after sandblasting with SiC consequently resulting in an increased flexural strength and fracture resistance under cyclic load conditions. Weibull modulus was reduced in all the groups with SiC blasting showing the least degradation of m values. The strengthening mechanism that is attributed to sandblasting procedure is influenced by the abrasive material used.
