Journal of Peking University(Health Sciences) >
Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants
Received date: 2020-10-12
Online published: 2023-08-03
Supported by
the National Natural Science Foundation of China(81671026);the Beijing Natural Science Foundation(7192233);the Capital Health Development Research Special Fund(首发2020-2-4104);the PKU School of Stomatology for Talented Young Investigators(PKUSS20190110)
Objective: To evaluate the effects of surface treatment on the phase and fracture strength of yttria-and magnesia-stabilized and its mechanisms. Methods: 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. Results: 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). Conclusion: 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.
Qian DING , Wen-jin LI , Feng-bo SUN , Jing-hua GU , Yuan-hua LIN , Lei ZHANG . Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants[J]. Journal of Peking University(Health Sciences), 2023 , 55(4) : 721 -728 . DOI: 10.19723/j.issn.1671-167X.2023.04.025
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