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Author(s): Jorge L. Alves
César L. Silva
João Sampaio Fernandes
Filipe S. Silva
Paulo J. Almeida
Ramiro C. Martins
Title: Analysis of the Stability of 3Y-TZP Zirconia Abutments After Thermocycling and Mechanical Loading
Issue Date: 2016
Abstract: Objectives: Although implant abutments made of yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) show great predictability, some issues related to its aging require furtherstudy. The objective of this in vitro study is to assess the stability of 3Y-TZP zirconia implantabutments with two different implant connections when subjected to aging simulationthrough thermocycling and mechanical loading (TCML).Methods: Ten 3Y-TZP zirconia abutments were selected and equally divided into two groups(n = 5): CEZr, abutments for externally hexed implants; and CIZr, abutments for implantswith an internal conical connection. The samples were subjected to thermocycling (5000cycles; 5-55 ◦C) and mechanical loading (1.2 × 106 cycles; 88.8 N; 4 Hz). Before and after theaging procedures, X-ray diffraction (XRD) analysis was conducted to observe tetragonalmonoclinic (t-m) phase transformation, and topographic surface analysis was performedby 3D profilometry, and data were analyzed using Mann-Witney test (p < 0.05).Results: XRD measurements revealed no monoclinic phase in any of the abutments afteraging. The comparative analysis regarding roughness (using the Sa parameter) at theabutments' seating platforms (using 3D profilometry) revealed a slight increase in roughness in both connections after TCML. Statistically significant differences (test U = 57.0,p = 0.161 > 0.05), before and after TCML, and between implants connections (test U = 57.0,p = 0.053 > 0.05) were not detected.Conclusions: After a 5-year simulation of its clinical use, the analyzed 3Y-TZP zirconia abutments did not show signs of aging. The connection's geometry does not interfere in aging.
Subject: Ciências da Saúde, Ciências médicas e da saúde
Health sciences, Medical and Health sciences
Scientific areas: Ciências médicas e da saúde
Medical and Health sciences
Document Type: Artigo em Revista Científica Nacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Nacional
FMDUP - Artigo em Revista Científica Nacional

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