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Influence of hydrofluoric acid concentration and previous thermal treatment on bond strength of lithium disilicate glass ceramic to a dual-cure resin cement modified by thio-urethane

Grant number: 14/23320-3
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): March 14, 2015
Effective date (End): December 13, 2015
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Luís Roberto Marcondes Martins
Grantee:Daniel Sundfeld Neto
Supervisor abroad: Carmem Silvia Pfeifer
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
Research place: Oregon Health & Science University, United States  
Associated to the scholarship:13/26573-7 - Effects of hydrofluoric acid concentration and thermal treatment on bond strenght to dental ceramic, BP.DR


The aim of this study is to evaluate the influence of lower hydrofluoric acid concentration, its association to previous thermal treatment of both hydrofluoric acid and ceramic, on the microtensile bond strength when bonded to dual cured resin cement modified by thio-urethane. A hundred and five glass ceramic blocks of IPS e.max Press (Ivoclar Vivadent) will be made and randomly divided into 2 groups according to the hydrofluoric acid concentration: 2.5% (n=80) and 10% (n=20). Later, the ceramic blocks will be randomly separated according to the previous thermal treatment adopted before the ceramic etching step: 1) without thermal treatment (control) (n=20); 2) hydrofluoric acid thermal treatment (stored in 70oC for 1 min) (n=20); 3) ceramic thermal treatment (air heated for 1 min 130oC) (n=20); 4) association of hydrofluoric acid and ceramic thermal treatment (n=20). The etching time will be set for 20 s and the hydrofluoric acid 10% will not be submitted to any thermal treatment (control). Then, a new random separation will be performed according to the resin cement type: 1) RelyX Ultimate (3M ESPE) without thio-urethane (n=10); 2) RelyX Ultimate modified by thio-urethane (n=10). After etched, a silane coupling agent Monobond-S (Ivoclar Vivadent) will be applied onto the ceramic surface, allowed to dry for 1 min, followed by air heat drying (60°C±5) for 1 min. The resin cement will be handled at the same proportions, placed to the center of the ceramic and bonded to resin composite blocks with a standard cementation load of 150N for 2 min. Light-activation will be performed for 40 s at right angles to each of the blocks, with a final 1-min light exposure from the top surface. The ceramic/resin composite will be stored in deionized water for 24 hours and sectioned perpendicularly to the bonding interface in x and y directions to obtain beams (1mm2), that will be submitted to microtensile bond strength. The data will be recorded, also with the failure patterns, and the 3-way ANOVA (hydrofluoric acid concentration; thermal treatment; resin cement), followed by Tukey`s test at 5% will be calculated. (AU)

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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)
SUNDFELD, DANIEL; MUNIZ PALIALOL, ALAN RODRIGO; FUGOLIN, ANA PAULA PIOVESAN; BOVI AMBROSANO, GLAUCIA MARIA; CORRER-SOBRINHO, LOURENCO; MARCONDES MARTINS, LUIS ROBERTO; PFEIFER, CARMEM SILVIA. The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic. Brazilian Oral Research, v. 32, 2018. Web of Science Citations: 3.
SUNDFELD, DANIEL; CORRER-SOBRINHO, LOURENCO; PAVESI PINI, NUBIA INOCENCYA; COSTA, ANA ROSA; SUNDFELD, RENATO HERMAN; PFEIFER, CARMEM SILVIA; MARCONDES MARTINS, LUIS ROBERTO. Heat treatment-improved bond strength of resin cement to lithium disilicate dental glass-ceramic. CERAMICS INTERNATIONAL, v. 42, n. 8, p. 10071-10078, JUN 2016. Web of Science Citations: 4.

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