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Effects of hydrofluoric acid concentration and thermal treatment on bond strenght to dental ceramic

Grant number: 13/26573-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2014
Effective date (End): December 01, 2016
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal researcher:Luís Roberto Marcondes Martins
Grantee:Daniel Sundfeld Neto
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
Associated scholarship(s):14/23320-3 - 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, BE.EP.DR


The aim of this study is to investigate, by microscopy images and bond strength, the effect of hydrofluoric acid concentrations and previous thermal treatment to the etching procedure on a dental ceramic. Vitreous ceramic blocks of IPS e.max Press (Ivoclar Vivadent, Schaan, Liechtenstein) will be made and randomly assigned in 2 groups for acid concentrations: 5% IPS Etching Gel (Ivoclar Vivadent, Schaan, Liechtenstein) and 9.5% Porcelain Etch (Ultradent Products Inc., South Jordan, UT, USA). Next, the samples will be randomly divided in 4 subgroups: no thermal treatment; thermal treatment of ceramic; thermal treatment of hydrofluoric acid; thermal treratment ceramic + hydrofluoric acid. After etching steps, the ceramic will be fixed to a dual cure resin cement (Variolink II, Ivoclar VIvadent, Schaan, Liechtenstein) to microhybrid resin composite (Z250, 3M ESPE, St. Paul, MN, USA) and randomly assigned in subgroups according to the microtensile bond strength and aging protocols: 24 hours after cementation; thermal cycling; thermal/mechanical cycling; 12 months water storage. It will be analyzed the failure modes classified as: adhesive failure (Mode 1); cohesive failure in ceramic (Mode 2); cohesive failure in resin cement (Mode 3); mixed failure (Mode 4). Representative samples of each group and subgroups will be randomly chosen for superficial and interface analysis by scanning electron microscopy. The results of microtensile bond strength will be tabulated and submitted to analysis of variance (ANOVA) with split parcel and Tukey test with 5% level of significance.

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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; 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, . (14/23320-3, 13/26573-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
NETO, Daniel Sundfeld. Evaluation of heat treatments and hydrofluoric acid concentrations on the surface morphology and bond strength to lithium disilicate reinforced glass ceramic. 2016. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba Piracicaba, SP.

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