Ageing assessment of zirconia implant prostheses by three different quantitative assessment techniques
Kyaw Phyu Phyu, Pongprueksa Pong, Anuchitolarn Warangkana, Sirinukunwatta Krongkarn, Suputtamongkol Kallaya,
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( Kyaw Phyu Phyu ) - Mahidol University Faculty of Dentistry
( Pongprueksa Pong ) - Mahidol University Faculty of Dentistry
( Anuchitolarn Warangkana ) - National Metal and Materials Technology Center Technical Support for Material Analysis Division
( Sirinukunwatta Krongkarn ) - Ministry of Science and Technology Department of Science Service
( Suputtamongkol Kallaya ) - Mahidol University Faculty of Dentistry
Abstract
PURPOSE: To evaluate the influence of cyclic loading on phase transformation of zirconia abutments and to compare the effectiveness of three different quantitative ageing assessment techniques.
MATERIALS AND METHODS: Thirty two Y-TZP prostheses fabricated from two brands, InCoris ZI and Ceramill ZI, were cemented to titanium bases and equally divided into two subgroups (n=8): control group without any treatment and aged group with cyclic loading between 20 N and 98 N for 100,000 cycles at 4 Hz in distilled water at 37℃. The tetragonal-to-monoclinic phase transformation was assessed by (i) conventional x-ray diffraction (XRD), (ii) micro x-ray diffraction (μXRD), and (iii) micro-Raman spectroscopy. The monoclinic-phase fractions (M%) were compared by two-way ANOVA.
RESULTS: InCoris Zi presented significantly higher M% than Ceramill Zi in both control and aged groups (P<.001). Both materials exhibited significant phase transformation with monoclinicphase of 1 to 3% more in aged groups than controls for all thre e assessment techniques. The comparable M% was quantified by both μXRD and XRD. The highest M% was assessed with micro-Raman.
CONCLUSION: Cyclic loading produced significant phase transformation in tested Y-TZP prostheses. The micro-Raman spectroscopy could be used as an alternative to XRD and μXRD.
키워드
Y-TZP ceramics; Cyclic loading; Phase transformation
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