Effect of ionizing radiation and chewing simulation on human enamel and zirconia
| Autor: | Raheleh Mohammad Rahimi, Grace M. De Souza, David F. Bahr, Beshr Hajhamid |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Surface Properties Modulus Young's modulus Electron microprobe symbols.namesake stomatognathic system Radiation Ionizing Materials Testing Humans Dentistry (miscellaneous) Cubic zirconia Irradiation Composite material Dental Enamel Enamel paint Nanoindentation Dental Porcelain stomatognathic diseases visual_art visual_art.visual_art_medium symbols Mastication Zirconium Profilometer Oral Surgery |
| Zdroj: | Journal of Prosthodontic Research. 65:67-72 |
| ISSN: | 1883-9207 1883-1958 |
| DOI: | 10.2186/jpr.jpor_2019_592 |
| Popis: | PURPOSE To evaluate the effect of ionizing irradiation on human enamel and zirconia after chewing simulation. METHODS Twenty enamel and twenty translucent Yttria-stabilized zirconia (Y-PSZ) specimens were divided in 4 groups: Co (control) - no irradiation on enamel cusps/opposing zirconia slabs; E70 - irradiated (70 Gray) enamel cusps/opposing irradiated enamel slabs; Z70 - irradiated zirconia cusps/opposing irradiated zirconia slabs; EZ70 - irradiated enamel cusps/opposing irradiated zirconia slabs. Cusps were abraded against slabs in a chewing simulator (CS - one million cycles, 80 N, artificial saliva, 37˚C). Wear and roughness of zirconia and enamel were analyzed using a stylus profilometer. The abraded enamel was analyzed by Electron probe micro-analyzer (EPMA) and zirconia was characterized by nanoindentation and X-ray diffraction. One-way analysis of variance (ANOVA) and Tukey test were used for analysis of wear, Repeated Measures and Bonferroni test for roughness, and hardness and modulus values were compared using Wilcoxan Mann Whitney rank sum test (overall 5% significance). RESULTS Significantly higher volume loss was presented by cusps in the E70 group (p |
| Databáze: | OpenAIRE |
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