Influence of piston material on the fatigue behavior of a glass-ceramic

The lack of standardization regarding the loading piston material used in fatigue tests could limit the interpretation of study findings. The purpose of this in vitro study was to evaluate the effect of the piston material on the fatigue behavior of a lithium disilicate glass-ceramic. Plate-shaped,...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2023-06, Vol.129 (6), p.931-937
Main Authors: Weber, Katia R., Meneghetti, Daniel E., Benetti, Paula, Della Bona, Alvaro, Griggs, Jason A., Borba, Márcia
Format: Article
Language:English
Subjects:
Ceramics - therapeutic use
Dental Implants
Dental Porcelain
Dental Stress Analysis
Epoxy Resins
Humans
Materials Testing
Resin Cements
Surface Properties
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Summary:The lack of standardization regarding the loading piston material used in fatigue tests could limit the interpretation of study findings. The purpose of this in vitro study was to evaluate the effect of the piston material on the fatigue behavior of a lithium disilicate glass-ceramic. Plate-shaped, 1.2-mm-thick, lithium disilicate glass-ceramic specimens were cemented onto a dentin analog substrate with resin cement. The specimens were divided into 4 groups according to the piston material used in the fatigue test (n=30): metal, glass fiber-reinforced epoxy resin, ceramic, and human tooth. The fatigue test was performed in a mechanical cycling machine by using the boundary technique at 2 Hz in distilled water at 37 °C. The fatigue data were analyzed by using the Weibull distribution and a lifetime-inverse power law relationship. Failures were evaluated with fractography and transillumination. The Weibull modulus (β) was similar among groups. The exponent of crack growth (n) was significantly greater for glass fiber-reinforced epoxy resin and tooth groups than for metal and ceramic; therefore, the probability of failure (Pf) of glass-ceramic specimens loaded by resin and tooth pistons depended more on load amplitude. Specimens tested with tooth showed the highest value of K (characteristic lifetime), which is an indication of greater survival. Radial crack was the only failure mode observed for all experimental groups. The piston material influenced the fatigue survival of the lithium disilicate glass-ceramic. The glass fiber-reinforced epoxy resin piston closely simulated the fatigue behavior induced by the human tooth on the evaluated glass-ceramic.
ISSN:0022-3913
1097-6841
DOI:10.1016/j.prosdent.2021.08.001