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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The effect of DLC-coating deposition method on the reliability and mechanical properties of abutment's screws

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Author(s):
Bordin, Dimorvan [1] ; Coelho, Paulo G. [2, 3] ; Bergamo, Edmara T. P. [4] ; Bonfante, Estevam A. [5] ; Witek, Lukasz [2] ; Del Bel Cury, Altair A. [4]
Total Authors: 6
Affiliation:
[1] Univ Guarulhos, Dept Restorat Dent, Guarulhos, SP - Brazil
[2] NYU, Coll Dent, Dept Biomat & Biomimet, New York, NY - USA
[3] NYU, Hansjorg Wyss Dept Plast Surg, Langone Med Ctr, 550 First Ave, New York, NY 10016 - USA
[4] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Piracicaba, SP - Brazil
[5] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Bauru, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Dental Materials; v. 34, n. 6, p. E128-E137, JUN 2018.
Web of Science Citations: 1
Abstract

Objective. To characterize the mechanical properties of different coating methods of DLC (diamond-like carbon) onto dental implant abutment screws, and their effect on the probability of survival (reliability). Methods. Seventy-five abutment screws were allocated into three groups according to the coating method: control (no coating); UMS-DLC applied through unbalanced magnetron sputtering; RFPA-DLC applied through radio frequency plasma-activated (n = 25/group). Twelve screws (n=4) were used to determine the hardness and Young's modulus (YM). A 3D finite element model composed of titanium substrate, DLC-layer and a counterpart were constructed. The deformation (jtm) and shear stress (MPa) were calculated. The remaining screws of each group were torqued into external hexagon abutments and subjected to step-stress accelerated life-testing (SSALT) (n =21/group). The probability Weibull curves and reliability (probability survival) were calculated considering the mission of 100, 150 and 200N at 50,000 and 100,000 cycles. Results. DLC-coated experimental groups evidenced higher hardness than control (p <0.05). In silico analysis depicted that the higher the surface Young's modulus, the higher the shear stress. Control and RFPA showed p<1, indicating that failures were attributed to materials strength; UMS showed beta>1 indicating that fatigue contributed to failure. High reliability was depicted at a mission of 100 N. At 200 N a significant decrease in reliability was detected for all groups (ranging from 39% to 66%). No significant difference was observed among groups regardless of mission. Screw fracture was the chief failure mode. Significance. DLC-coating have been used to improve titanium's mechanical properties and increase the reliability of dental implant-supported restorations. (C) 2018 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 16/18818-8 - Multi-User Equipment approved in grant 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
Grantee:Estevam Augusto Bonfante
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
Grantee:Estevam Augusto Bonfante
Support Opportunities: Research Grants - Young Investigators Grants