Effect of surface treatments on the resin bond to zirconium-based ceramic.
OBJECTIVE
This study tested the hypothesis that the tribochemical silica coating on ceramic surfaces increases the bond strength of resin cement to a glass-infiltrated zirconium-based ceramic.


METHODS
Fifteen blocks of In-Ceram Zirconia from CEREC InLab (5 per group) and 15 composite blocks (Z-250) 5 mm x 5 mm x 4 mm were made. The ceramic surfaces were polished, and the blocks were divided into three groups: (1) airborne abrasion with 110-microm aluminum oxide particles; (2) Rocatec system, tribochemical silica coating; and (3) CoJet system, tribochemical silica coating. The ceramic blocks were cemented to the composite blocks using Panavia F according to the manufacturer's specifications. All samples were stored in 37 degrees C distilled water for 7 days and later sectioned in two axes using a diamond disk under cooling to obtain specimens with a cross-sectional area of approximately 1 mm2 (n = 45). Each specimen was then attached with cyanoacrylate glue to an adapted device for the microtensile test, which was carried out on a universal testing machine.


RESULTS
The results were subjected to ANOVA and Tukey's test. Group 2 (23.0+/-6.7 MPa) and group 3 (26.8+/-7.4 MPa) showed greater bond strength than group 1 (15.1+/-5.3 MPa). There was no significant difference between groups 2 and 3. All failures were in the adhesive zone.


CONCLUSIONS
The hypothesis was confirmed--the tribochemical systems increased the bond strength between Panavia F and In-Ceram Zirconia.
Bottino
Marco Antonio
MA
Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University at São José dos Campos (UNESP), São José dos Campos CEP 12245-000, Brazil. mmbottino@uol.com.br
Valandro
Luiz Felipe
LF
Scotti
Roberto
R
Buso
Leonardo
L
D020906:Air Abrasion, Dental; D000537:Aluminum Oxide; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D017276:Friction; D008422:Materials Testing; D019279:Resin Cements; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength
D003188:Composite Resins; D003738:Dental Cements; C444701:Filtek Z250; C485633:In-Ceram Zirconia; C438843:Panavia-Fluoro; D019279:Resin Cements; C076811:Rocatec; D003776:Dental Porcelain; D012822:Silicon Dioxide; D000537:Aluminum Oxide