Journal article
Ceramic strengthening by tuning the elastic moduli of resin-based luting agents
Dental materials, Vol.33(3), pp.358-366
03/01/2017
DOI: 10.1016/j.dental.2017.01.002
PMID: 28174009
Abstract
Objective. Resin-based luting agents (RBLAs) with tuned elastic moduli (E) were prepared and their influence on the strengthening, reliability, and mode of failure of luted feldspar ceramic was investigated.
Methods. RBLAs with low E (2.6 GPa), intermediate E (6.6 GPa), and high E (13.3 GPa) were prepared and used to coat acid-etched ceramic disks. Positive (untreated ceramic) and negative (acid-etched ceramic) control groups were tested. The response variables (n = 30) were biaxial flexural strength (sigma(bf), MPa), characteristic strength (sigma(0), MPa), and Weibull modulus at the ceramic surface (z = 0) and luting agent surface (z = -t2). A 3D finite element analysis simulated the biaxial flexural test. Fractographic analysis and morphology of the bonded interfaces were analyzed using scanning electron microscopy.
Results. The RBLAs improved sigma(bf) and ao at z = 0, particularly those with intermediate and high E, whereas the mechanical reliability was only affected in the negative control. At z = -t2, differences between all RBLAs were observed but the structural reliability was independent of the RBLA tested. Increasing E of the RBLA was associated with increased stress concentration at the RBLA and reduced stresses reaching the ceramic. Failures originated on the ceramic surface at the ceramic-cement interface. In the high E group, failure sometimes originated from the RBLA free surface. All RBLAs completely filled the ceramic irregularities.
Significance. Increased E of the RBLA reduced the variability of strength, the stress reaching the ceramic structure, and sometimes altered the origin of failure. The use of high E RBLAs seems beneficial for luting feldspar ceramics. (C) 2017 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Details
- Title: Subtitle
- Ceramic strengthening by tuning the elastic moduli of resin-based luting agents
- Creators
- Aloisio O. Spazzin - Atitus EducaçãoAtais Bacchi - Atitus EducaçãoRodrigo Alessandretti - Universidade de Passo FundoMateus B. Santos - University of Iowa, ProsthodonticsGabriela R. Basso - Universidade Federal de PelotasJason Griggs - University of Mississippi Medical CenterRafael R. Moraes - Universidade Federal de Pelotas
- Resource Type
- Journal article
- Publication Details
- Dental materials, Vol.33(3), pp.358-366
- DOI
- 10.1016/j.dental.2017.01.002
- PMID
- 28174009
- NLM abbreviation
- Dent Mater
- ISSN
- 0109-5641
- eISSN
- 1879-0097
- Publisher
- Elsevier
- Number of pages
- 9
- Language
- English
- Date published
- 03/01/2017
- Academic Unit
- Prosthodontics
- Record Identifier
- 9984946626702771
Metrics
1 Record Views