The Impact of In Vitro Accelerated Aging, Approximating 30 and 60 Years In Vivo, on Commercially Available Zirconia Dental Implants
Background Despite increased popularity of Zirconia dental implants, concerns have been raised regarding low temperature degradation (LTD) and its effect on micro‐structural integrity. Purpose This study evaluated the effect of LTD on four types of Zirconia dental implants at 0, 30, and 60 years of...
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Veröffentlicht in: | Clinical implant dentistry and related research 2017-04, Vol.19 (2), p.245-252 |
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Sprache: | eng |
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Zusammenfassung: | Background
Despite increased popularity of Zirconia dental implants, concerns have been raised regarding low temperature degradation (LTD) and its effect on micro‐structural integrity.
Purpose
This study evaluated the effect of LTD on four types of Zirconia dental implants at 0, 30, and 60 years of artificial aging. The impact of aging on t‐m transformation and micro crack formation was measured.
Materials and Methods
Accelerated aging at 15 and 30 hours, approximating 30 and 60 years in vivo, aged 36 Zirconia dental implants: Z systems® (A), Straumann® (B), Ceraroot® (C), and Zeramex® (D). Focused ion beam‐scanning electron microscopic analysis determined the micro structural features, phase transformation, and the formation of micro cracks.
Results
At 15 hours, type A implant presented with micro cracks and t‐m transformation of 0.9 µm and 3.1 µm, respectively. At 30 hours, micro cracks remained shallow (1 µm). At 15 hours, type B implant presented micro cracks (0.7 µm) and grain transformation (1.2 µm). At 30 hours, these features remained superficial at 0.6 and 1.5 µm, respectively. Type C implant presented surface micro cracks of 0.3 µm at 15 hours. The depth of t‐m transformation slightly increased to 1.4 µm. At 30 hours, number of micro cracks increased at the surface to an average depth of 1.5 µm. Depth of t‐m transformation increased to an average of 2.5 µm. At 15 hours, micro cracks remained superficial (0.8 µm) for type D implant and depth of t‐m transformation increased to 2.3 µm. At 30 hours, the depth of micro cracks increased to an average of 1.3 µm followed by increased t‐m transformation to a depth of 4.1 µm.
Conclusion
Depth of grain transformation remained within 1‐4 µm from the surface. The effect of aging was minimal for all Zirconia implants. |
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ISSN: | 1523-0899 1708-8208 |
DOI: | 10.1111/cid.12462 |