Surface, microstructural and mechanical characterization of contemporary implant abutment screws.

Autor: Kouveliotis G; Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece., Dimitriadis K; Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece., Kourtis S; Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece., Zinelis S; Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece. Electronic address: szinelis@dent.uoa.gr.
Jazyk: angličtina
Zdroj: Dental materials : official publication of the Academy of Dental Materials [Dent Mater] 2024 Feb; Vol. 40 (2), pp. 219-226. Date of Electronic Publication: 2023 Nov 15.
DOI: 10.1016/j.dental.2023.11.002
Abstrakt: Objectives: The aim of the present work was to evaluate six commercially available abutment screws by characterising roughness parameters, microstructure and mechanical properties.
Methods: Six abutment screws from each implant system, were used. The surface roughness parameters (S a , S q , S sk , S ku , S pk , S k and S vk ) were identified by an optical interferometric profiler. Microstructural observations and crystallographic analysis were performed using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDX) device for elemental analysis and an X-ray diffractometer (XRD), respectively. The Martens Hardness (HM), Indentation Modulus (E IT ), elastic index (η IT ) and Vickers hardness (HV) of all specimens were determined by instrumented indentation testing (IIT). The results were analyzed by one-way ANOVA and Tukey multiple-comparison tests (a=0.05).
Results: EDX and XRD showed the abutment screws to be mixed α- and β-phase titanium alloys. Microstructural analysis revealed a fine homogeneous microstructure without porosity, consisting of fine dispersoid rods of β-phase embedded in a continuous α-phase matrix. Statistically significant differences were found among the mechanical properies and surface roughness parameters apart from S q , S pk and S vk .
Conclusions: The tested abutment screws showed significant differences in the probed properties, and, thus, differences in their clinical behaviour are anticipated.
(Copyright © 2023 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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