Fracture resistence of aging ceramics and elasticity modulus evaluation of a luting cement

• Grant number: 10/18071-3
• Support Opportunities: Regular Research Grants
• Start date: May 01, 2011
• End date: April 30, 2013
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Estevão Tomomitsu Kimpara
• Grantee: Estevão Tomomitsu Kimpara
• Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil
• Associated researchers: Caroline Cotes Marinho

Abstract

The objective of this study is to evaluate the resistance to fracture of crowns based ceramics of lithium dissilicate (IPS e.max CAD) submitted to neutralization of the hydrofluoric acid (HF) precipitate with sodium bicarbonate associated with sonic bathing sonic and aged by thermo and mechanics cycling (TMC). In addition, it is important for the improvement of the proposed methodology to verify whether there is a difference between the modulus of elasticity of a two cements with different viscosities and to verify if the ceramics used in this work behave in the same way both when submitted a TMC separately as TCM performed concomitantly. Eighty human third molars will receive a conventional prepare for crown and will be scanned digitally for CAD/CAM machining system to obtain the crowns. They will be distributed in groups according to the surface treatment: Groups 1 and 3: HF + silane; Groups 2 and 4: HF + neutralization + sonic bathing. The crowns will be cemented and the specimens of groups 3 and 4 will be submitted to TMC associated, and the samples will be submitted to compression test. To evaluate the modulus of elasticity of cement, 20 bars of Variolink II low viscosity (Group 1) and 20 Variolink II high viscosity (Group 2) will be made, which will be subject to a flexion test. 10 ceramic blocks shall be cut in the form of bar and divided into two groups: Group 1 - TMC separate; Group 2 - TMC associated; and the samples shall be subject to flexion test. The data shall be tabulated and submitted to descriptive and inferential statistical analysis compatible with the results. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

COTES, CAROLINE; ZOGHEIB, LUCAS; MACEDO, VANESSA; CARVALHO, RODRIGO; MARTIARTINELLI, CAROLINA; KIMPARA, ESTEVAO. Influence of post-etching surface treatment and thermo-mechanical cycling on fracture strength of ceramics. MINERVA STOMATOLOGICA, v. 65, n. 5, p. 291-298, OCT 2016. (10/18071-3)