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      Influence of mechanical surface treatments on the indentation fracture toughness of glass infiltrated zirconia toughened alumina "GI-ZTA" disks


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          The main objective of this study was to evaluate the influence of mechanical surface treatments for excess glass removal on the fracture toughness of a glass infiltrated zirconia toughened alumina "GI-ZTA" disks (In-Ceram® Zirconia). The GI-ZTA disks were submitted to three different mechanical surface treatments after glass infiltration (grinding, sandblasting and grinding/sandblasting/annealing). Fracture toughness was evaluated through indentation fracture (IF) test. Reliability of tests results was accessed through Weibull statistics. Results: Indentation fracture tests (IF) of GI-ZTA disks have shown that grinding was the surface treatment that presented the lowest K Ic and reliability. An annealing treatment after grinding and sandblasting promoted an increase in K Ic, mainly due to monoclinic-tetragonal reverse transformation recovering the tetragonal zirconia lost during the different mechanical surface treatments. The highest K Ic values were observed after sandblasting and grinding/sandblasting/annealing. Significance: The proposed mechanical surface treatments played an important role on the metastability of tetragonal zirconia and strongly influenced the mechanical performance of GI-ZTA. Kruskhall-Wallis test indicated that K Ic values of the three mechanical surface treatments were statistically distinct.

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          Most cited references22

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          A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I, Direct Crack Measurements

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            Phase Analysis in Zirconia Systems

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              Reliability and properties of ground Y-TZP-zirconia ceramics.

              Yttria-stabilized zirconia ceramics is a high-performance material with excellent biocompatibility and mechanical properties, which suggest its suitability for posterior fixed partial dentures. The hypothesis under examination is that the strength and reliability of Y-TZP zirconia ceramics are affected by the inner surface grinding of crowns, and vary with the grinding parameter. Flexural strength, surface roughness, and fracture toughness were determined on samples machined by face and peripheral grinding with varied feed velocities and cutting depths. Results have been compared with those on lapped samples. Analysis of variance and Weibull parameter were used for statistical analysis. It was found that inner surface grinding significantly reduces the strength and reliability of Y-TZP zirconia compared with the lapped control sample. Co-analysis of flexural strength, Weibull parameter, and fracture toughness showed counteracting effects of surface compressive stress and grinding-introduced surface flaws. In conclusion, grinding of Y-TZP needs to be optimized to achieve the CAD/CAM manufacture of all-ceramic restorations with improved strength and reliability.

                Author and article information

                Matéria (Rio de Janeiro)
                Matéria (Rio J.)
                Rede Latino-Americana de Materiais (Rio de Janeiro, RJ, Brazil )
                : 12
                : 2
                : 420-427
                [02] Rio de Janeiro RJ orgnameUniversidade Veiga de Almeida orgdiv1CSUVA
                [01] Rio de Janeiro RJ orgnameUniversidade Federal do Rio de Janeiro orgdiv1COPPE orgdiv2PEMM flatesi@ 123456metalmat.ufrj.br
                [03] Rio de Janeiro RJ orgnameUniversidade Federal do Rio de Janeiro orgdiv1IF hsalim@ 123456if.ufrj.br
                S1517-70762007000200020 S1517-7076(07)01200220

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                : 22 August 2006
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 23, Pages: 8

                SciELO Brazil

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                mechanical surface treatments,zirconia,glass infiltrated ZTA,Fracture toughness


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