CAD/CAM machining Vs pre-sintering in-lab fabrication techniques of Y-TZP ceramic specimens: Effects on their mechanical fatigue behavior.
This study evaluated the effects of different pre-sintering fabrication processing techniques of Y-TZP ceramic (CAD/CAM Vs. in-lab), considering surface characteristics and mechanical performance outcomes. Pre-sintered discs of Y-TZP ceramic (IPS e.max ZirCAD, Ivoclar Vivadent) were produced using different pre-sintering fabrication processing techniques: Machined- milling with a CAD/CAM system; Polished- fabrication using a cutting device followed by polishing (600 and 1200 SiC papers); Xfine- fabrication using a cutting machine followed by grinding with extra-fine diamond bur (grit size 30 μm); Fine- fabrication using a cutting machine followed by grinding with fine diamond bur (grit size 46 μm); SiC- fabrication using a cutting machine followed by grinding with 220 SiC paper. Afterwards, the discs were sintered and submitted to roughness (n=35), surface topography (n=2), phase transformation (n=2), biaxial flexural strength (n=20), and biaxial flexural fatigue strength (fatigue limit) (n=15) analyses. No monoclinic-phase content was observed in all processing techniques. It can be observed that obtaining a surface with similar characteristics to CAD/CAM milling is essential for the observation of similar mechanical performance. On this sense, grinding with fine diamond bur before sintering (Fine group) was the best mimic protocol in comparison to the CAD/CAM milling.
MSciD-PhD Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: camila-svs@hotmail.com.
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Zucuni
MSciD-PhD Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: luisfguilardi@hotmail.com.
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Guilardi
MSciD-PhD Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: sara.odonto@yahoo.com.br.
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Fraga
MSciD-PhD Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: liligmay@gmail.com.
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May
MSciD-PhD Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil; MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul, Brazil. Electronic address: gabrielkrpereira@hotmail.com.
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Pereira
MSciD-PhD Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: lfvalandro@hotmail.com.
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Valandro
D002516:Ceramics / Q000737:chemistry*; D017076:Computer-Aided Design; D008422:Materials Testing; D013499:Surface Properties; D015019:Yttrium / Q000032:analysis*; D015040:Zirconium / Q000032:analysis*
C499362:yttria stabilized tetragonal zirconia; D015019:Yttrium; D015040:Zirconium
CAD/CAM fabrication; Dental ceramics; Fabrication processing; Machining; Mechanical properties; Yttrium-stabilized tetragonal zirconia polycrystal