Mechanical properties of zirconia after different surface treatments and repeated firings
2
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
PURPOSE. This study investigated the influence of surface conditioning procedures and repeated firings on monoclinic content and strength of zirconia before cementation. MATERIALS AND METHODS. Sintered barshaped zirconia specimens were subjected to no surface treatment (control), air abrasion, or grinding (n=21). Their roughness was evaluated using a profilometer, and microscope analysis was performed on one specimen of each group. Then, 2 or 10 repeated firings (n=10) were executed, the monoclinic content of specimens was analyzed by X-ray diffraction, and a three-point flexural strength test was performed. Surface roughness values were compared using one-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) tests, the monoclinic content values were tested using Kruskal-Wallis and Mann-Whitney U tests, and the flexural strength values were tested using two-way ANOVA and Tukey HSD tests (P=.05). Spearman’s correlation test was performed to define relationships among measured parameters. RESULTS. Surface-treated specimens were rougher than untreated specimens and had a higher monoclinic content (P<.005), and the relationship between roughness and monoclinic content was significant (P<.000). Neither surface treatment nor firing significantly affected the flexural strength, but Weibull analysis showed that for the air-abraded samples the characteristic strength was significantly lower after the 10th firing than after the 2nd firing. CONCLUSION. After firing, a negligible amount of monoclinic content remained on the zirconia surfaces, and rougher surfaces had higher monoclinic contents than untreated surfaces. Multiple firings could be performed if necessary, but the fracture probability could increase after multiple firings for rougher surfaces.
Abstract
PURPOSE. This study investigated the influence of surface conditioning procedures and repeated firings on monoclinic content and strength of zirconia before cementation. MATERIALS AND METHODS. Sintered barshaped zirconia specimens were subjected to no surface treatment (control), air abrasion, or grinding (n=21). Their roughness was evaluated using a profilometer, and microscope analysis was performed on one specimen of each group. Then, 2 or 10 repeated firings (n=10) were executed, the monoclinic content of specimens was analyzed by X-ray diffraction, and a three-point flexural strength test was performed. Surface roughness values were compared using one-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) tests, the monoclinic content values were tested using Kruskal-Wallis and Mann-Whitney U tests, and the flexural strength values were tested using two-way ANOVA and Tukey HSD tests (P=.05). Spearman’s correlation test was performed to define relationships among measured parameters. RESULTS. Surface-treated specimens were rougher than untreated specimens and had a higher monoclinic content (P<.005), and the relationship between roughness and monoclinic content was significant (P<.000). Neither surface treatment nor firing significantly affected the flexural strength, but Weibull analysis showed that for the air-abraded samples the characteristic strength was significantly lower after the 10th firing than after the 2nd firing. CONCLUSION. After firing, a negligible amount of monoclinic content remained on the zirconia surfaces, and rougher surfaces had higher monoclinic contents than untreated surfaces. Multiple firings could be performed if necessary, but the fracture probability could increase after multiple firings for rougher surfaces.
참고문헌 (39)
- Denry I., "State of the art of zirconia for dental applications", Dent Mater, 24, pp.299~307 (2008)
- Kelly JR., "Stabilized zirconia as a structural ceramic : an overview", Dent Mater, 24, pp.289~298 (2008)
- Papanagiotou HP., "In vitro evaluation of low-temperature aging effects and finishing procedures on the flexural strength and structural stability of Y-TZP dental ceramics", J Prosthet Dent, 96, pp.154~164 (2006)
- Manicone PF., "An overview of zirconia ceramics : basic properties and clinical applications", J Dent, 35, pp.819~826 (2007)
- Luthardt RG., "Reliability and properties of ground Y-TZP-zirconia ceramics", J Dent Res, 81, pp.487~491 (2002)
- Piconi C., "Zirconia as a ceramic biomaterial", Biomaterials, 20, pp.1~25 (1999)
- Vagkopoulou T., "Zirconia in dentistry : Part 1. Discovering the nature of an upcoming bioceramic", Eur J Esthet Dent, 4, pp.130~151 (2009)
- Yamaguchi H., "Examination of bond strength and mechanical properties of Y-TZP zirconia ceramics with different surface modifications", Dent Mater J, 31, pp.472~480 (2012)
- Kosmac T., "Strength and reliability of surface treated Y-TZP dental ceramics", J Biomed Mater Res, 53, pp.304~313 (2000)
- Curtis AR., "The influence of surface modification techniques on the performance of a Y-TZP dental ceramic", J Dent, 34, pp.195~206 (2006)
- Guazzato M., "Influence of surface and heat treatments on the flexural strength of Y-TZP dental ceramic", J Dent, 33, pp.9~18 (2005)
- Guazzato M., "Influence of grinding, sandblasting, polishing and heat treatment on the flexural strength of a glass-infiltrated alumina-reinforced dental ceramic", Biomaterials, 25, pp.2153~2160 (2004)
- Karakoca S., "Influence of surface treatments on surface roughness, phase transformation, and biaxial flexural strength of Y-TZP ceramics", J Biomed Mater Res B Appl Biomater, 91, pp.930~937 (2009)
- Guess PC., "Damage and reliability of Y-TZP after cementation surface treatment", J Dent Res, 89, pp.592~596 (2010)
- Denry IL., "Effect of heat treatment after accelerated aging on phase transformation in 3Y-TZP", J Biomed Mater Res B Appl Biomater, 93, pp.236~243 (2010)
- Sato H., "Mechanical properties of dental zirconia ceramics changed with sandblasting and heat treatment", Dent Mater J, 27, pp.408~414 (2008)
- Manawi M., "Impact of surface finishes on the flexural strength and fracture toughness of In-Ceram Zirconia", Gen Dent, 60, pp.138~142 (2012)
- Işeri U., "Comparison of different grinding procedures on the flexural strength of zirconia", J Prosthet Dent, 107, pp.309~315 (2012)
- Souza RO., "Air-particle abrasion on zirconia ceramic using different protocols : effects on biaxial flexural strength after cyclic loading, phase transformation and surface topography", J Mech Behav Biomed Mater, 26, pp.155~163 (2013)
- Denry IL., "Effect of heat treatment on microcrack healing behavior of a machinable dental ceramic", J Biomed Mater Res, 48, pp.791~796 (1999)
- Garvie RC., "Phase analysis in zirconia systems", J Am Ceram Soc, 55, pp.303~305 (1972)
- Toraya H., "Calibration curve for quantitative analysis of the monoclinic-tetragonal ZrO2 system by X-ray diffraction", J Am Ceram Soc, 67, pp.C119~C121 (1984)
- Chintapalli RK., "Phase transformation and subsurface damage in 3Y-TZP after sandblasting", Dent Mater, 29, pp.566~572 (2013)
- Kosmac T., "The effect of surface grinding and sandblasting on flexural strength and reliability of Y-TZP zirconia ceramic", Dent Mater, 15, pp.426~433 (1999)
- Bona AD., "Weibull analysis and flexural strength of hot-pressed core and veneered ceramic structures", Dent Mater, 19, pp.662~669 (2003)
- Kern M., "Bonding to zirconia ceramic : adhesion methods and their durability", Dent Mater, 14, pp.64~71 (1998)
- Song JY., "Fracture strength and microstructure of Y-TZP zirconia after different surface treatments", J Prosthet Dent, 110, pp.274~280 (2013)
- Monaco C., "Microstructural changes produced by abrading Y-TZP in presintered and sintered conditions", J Dent, 41, pp.121~126 (2013)
- Denry IL., "Microstructural and crystallographic surface changes after grinding zirconia-based dental ceramics", J Biomed Mater Res B Appl Biomater, 76, pp.440~448 (2006)
- Deville S., "Influence of surface finish and residual stresses on the ageing sensitivity of biomedical grade zirconia", Biomaterials, 27, pp.2186~2192 (2006)
- Mecholsky JJ Jr., "Fracture mechanics principles", Dent Mater, 11, pp.111~112 (1995)
- Seghi RR., "Relative flexural strength of six new ceramic materials", Int J Prosthodont, 8, pp.239~246 (1995)
- Guazzato M., "Strength, fracture toughness and microstructure of a selection of allceramic materials. Part II. Zirconia-based dental ceramics", Dent Mater, 20, pp.449~456 (2004)
- Curtis AR., "The influence of simulated masticatory loading regimes on the bi-axial flexure strength and reliability of a Y-TZP dental ceramic", J Dent, 34, pp.317~325 (2006)
- Itinoche KM., "Effect of mechanical cycling on the flexural strength of densely sintered ceramics", Dent Mater, 22, pp.1029~1034 (2006)
- Yilmaz H., "Flexural strength and fracture toughness of dental core ceramics", J Prosthet Dent, 98, pp.120~128 (2007)
- "ISO 6872:2008. Dentistry-ceramic materials", ISO, ~ (2008)
- Borchers L., "Influence of hydrothermal and mechanical conditions on the strength of zirconia", Acta Biomater, 6, pp.4547~4552 (2010)
- Oh SC., "Strength and microstructure of IPS Empress 2 glass-ceramic after different treatments", Int J Prosthodont, 13, pp.468~472 (2000)