Effect of ceramic surface treatment on the microtensile bond strength between a resin cement and an alumina-based ceramic.
OBJECTIVE
The objective of this study was to test the following hypothesis: the silica coating on ceramic surface increases the bond strength of resin cement to a ceramic.


METHODS
In-Ceram Alumina blocks were made and the ceramic surface was treated: G1--sand-blasting with 110-microm aluminum oxide particles; G2--Rocatec System: tribochemical silica coating (Rocatec-Pre powder + Rocatec-Plus powder + Rocatec-Sil); G3--CoJet System: silica coating (CoJet-Sand) + ESPE-Sil. The ceramic blocks were cemented to composite blocks with Panavia F resin cement (under a load of 750 g/1 min). The cemented blocks were stored in distilled water at 37 degrees C for 7 days and sectioned along the x and y axes with a diamond disk. Samples with an adhesive area of ca 0.8 mm2 (n = 45) were obtained. The samples were attached to an adapted device for the microtensile test, which was performed in a universal testing machine (EMIC) at a crosshead speed of 1 mm/min.


RESULTS
The obtained results were submitted to ANOVA and Tukey's test. Mean values of tensile strength (MPa) and standard deviation values were: (G1) 16.8+/-3.2; (G2) 30.6+/-4.5; (G3) 33.0+/-5.0. G2 and G3 presented greater tensile strength than G1. There was no significant difference between G2 and G3. All the failures took place at the ceramic/resin cement interface.


CONCLUSIONS
The silica coating (Rocatec or CoJet systems) of the ceramic surface increased the bond strength between the Panavia F resin cement and alumina-based ceramic.
Valandro
Luiz Felipe
LF
Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria at Santa Maria/RS, Brazil. lfvalandro@smail.ufsm.br
Leite
Fabiola Persea Pereira
FP
Scotti
Roberto
R
Bottino
Marco Antonio
MA
Niesser
Maximiliano Piero
MP
D000704:Analysis of Variance; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength
D003738:Dental Cements; D017220:Dentin-Bonding Agents; C483026:In-Ceram Alumina; C438843:Panavia-Fluoro; D019279:Resin Cements; C076811:Rocatec; D003776:Dental Porcelain; D012822:Silicon Dioxide