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Effect of surface treatments on zirconia surface composition and on bond strength with different cements

Grant number: 11/14461-4
Support Opportunities:Regular Research Grants
Duration: November 01, 2011 - October 31, 2013
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Renata Garcia Fonseca
Grantee:Renata Garcia Fonseca
Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


In general surface treatments (hydrofluoric acid followed by silane) employed for silica-based ceramics are not efficient for zirconia once this material has a glass-free polycrystal microstructure making it an acid-resistant. Therefore, the search for alternative treatments that provide micromechanical retention and adhesion is necessary in order to reach a strong and durable bond at zirconia/cement interface. The purpose of this study is to evaluate the effect of different treatments on the zirconia Lava (3M ESPE) surface composition and on the shear bond strength (SBS) with different cements. Two-hundred and eighty disc-shaped (5 mm diameter x 2 mm thickness) zirconia ceramics will be fabricated, which will be divided into 7 groups according to the following surface treatments: 1) Al2O3 50 µm; 2) Al2O3 50 µm + silane; 3) Al2O3 110 µm (Rocatec Pre); 4) Rocatec Pre + silane; 5) silica-modified Al2O3 particles (30 µm) (Rocatec Soft) + silane; 6) Rocatec Pre + silica-modified Al2O3 particles (110 µm) (Rocatec Plus) + silane and 7) Rocatec Plus + silane. After airborne-particle abrasion, the discs will be ultrasonically cleaned in 99% isopropanol for 3 min and afterwards silane will be applied. Pre-polymerized composite resin discs (5 mm diameter x 2 mm thickness) will be bonded to zirconia with the cements: 1) RelyX Luting 2; 2) RelyX ARC; 3) RelyX U100 and 4) Panavia F (n=10). In the groups bonded with RelyX Luting 2, RelyX ARC and RelyX U100, the silane RelyX Ceramic Primer (3M ESPE) will be applied while in the groups bonded with Panavia F, the silane Clearfil Ceramic Primer (Kuraray) will be used. Specimens will be thermocycled between 5°C and 55 °C in distilled water with a dwell time of 30 s for 10,000 cycles. Shear bond strength will be conducted with a universal testing machine (EMIC DL2000) at a crosshead speed of 0.5 mm/min. Data will be statistically analyzed according to normality and hemocedasticity results (±=0,05). The failure mode of all specimens will be determined under a stereomicroscope (x20). Additionally, zirconia discs of each airborne-particle abrasion condition (n=2) will have their surfaces analyzed by EDS. (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)
SCIASCI, PLINIO; ABI-RACHED, FILIPE OLIVEIRA; ADABO, GELSON LUIS; BALDISSARA, PAOLO; FONSECA, RENATA GARCIA. Effect of surface treatments on the shear bond strength of luting cements to Y-TZP ceramic. JOURNAL OF PROSTHETIC DENTISTRY, v. 113, n. 3, p. 212-219, . (11/14461-4)

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