Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants].

Q Ding, W J Li, F B Sun, J H Gu, Y H Lin, L Zhang

Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences 2023 Aug 18

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To evaluate the effects of surface treatment on the phase and fracture strength of yttria-and magnesia-stabilized and its mechanisms. One-piece cylindrical screw-type implants were fabricated with yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and magnesia partially stabilized zirconia (Mg-PSZ) using computer aided design (CAD)/computer aided manufacture (CAM) technique.They were divided into three groups: (1) placed in water for 1 h after final sintering (control group), (2) sandblasting using 110 μm Al2O3 particles, (3) sandblasting plus etching with hydrofluoric acid for 1 h.The surface morphology and roughness of the implants were evaluated.Tetragonal to monoclinic transformation was measured on the surface by X-ray diffraction.Static tests of the zirconia implants were carried out at room temperature following the International Standards Organization (ISO)14801:2014 Standard. Both sandblasting alone and sandblasting plus acid etching significantly increased surface roughness (Ra) of Mg-PSZ and Y-TZP implants (P < 0.01), with sandblasting plus acid etching exhibited the highest surface roughness.No monoclinic band was detected in Mg-PSZ surface.Compared with the control group, the surface monoclinic content of Mg-PSZ had no obvious change after surface treatments.However, strong monoclinic bands appeared in surface modified Y-TZP.Monoclinic content of Y-TZP was higher than that of control group (1.55%) after both sandblasting alone (16.44%) and sandblasting plus acid etching (7.68%).For Mg-PSZ implants, fracture strengths of sandblasting group and sandblasting plus acid etching group were (294.1±3.3) N and (331.3±26.4) N respectively, which were lower than that of control group (458.4±48.7) N with significant differences (P < 0.01).For Y-TZP implants, fracture strength of control group was (827.3±101.6) N.Compared with control group, sandblasting group showed significantly higher fracture strength (P=0.03), which was (1 162.9±116.5) N.While sandblasting plus acid etching group had a fracture strength of (867.2±171.0) N, with no significant difference with control group (P>0.99). Sandblasting improved the fracture strength of Y-TZP implants.For the Mg-PSZ implants manufactured in this study, surface treatments with sandblasting and sandblasting plus acid etching resulted in a decrease of fracture strength.

Citation

Q Ding, W J Li, F B Sun, J H Gu, Y H Lin, L Zhang. Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants]. Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences. 2023 Aug 18;55(4):721-728