Tribochemical Glass Ceramic Coating as a New Approach for Resin Adhesion to Zirconia.
OBJECTIVE
To investigate the effects of a novel tribochemical silica coating technique with powders made from feldspathic ceramic and leucite-based ceramic on the bond strength of zirconia to resin cement before and after aging.


METHODS
Zirconia blocks were divided into 3 groups according to the material used for airborne-particle abrasion: 1) SP (control): silica-coated alumina particles; 2) FP: feldspathic ceramic powder; 3) LP: leucite glass-ceramic powder. After silanization, composite resin cylinders were cemented on the zirconia surface using a dual-curing resin cement. Prior to the shear bond strength (SBS) test, half of the samples (n = 15) were stored in distilled water for 24 h; the other half (n = 15) were submitted to aging (10,000 thermocycles of 5°C to 55°C; 150 days of water storage). The bond strength data were analyzed using two-way ANOVA and Tukey's test (α = 0.05). Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction analysis were performed.


RESULTS
The initial bond strengths did not differ significantly between the groups (p = 0.053). However, after aging procedures, airborne-particle abrasion with feldspathic ceramic powder (FP) resulted in higher values of bond strength (p = 0.0001). SEM and EDS indicated that all the treatments promoted silica deposition on the Y-TZP surface ceramic. Airborne-particle abrasion with FP and LP induced a lower percentage of the monoclinic phase.


CONCLUSIONS
Airborne abrasion with fine feldspathic ceramic particles is a novel tribochemical technique and appears to be suitable for improving the bond strength between zirconia and resin cements.
Vinícius Felipe
VF
Wandscher
Sara
S
Fraga
João Luiz
JL
Pozzobon
Fabio Zovico Maxnuck
FZ
Soares
Edson Luiz
EL
Foletto
Liliana Gressler
LG
May
Luiz Felipe
LF
Valandro
D002516:Ceramics; D001840:Dental Bonding; D003738:Dental Cements; D003764:Dental Materials; D008422:Materials Testing; D019279:Resin Cements; D012822:Silicon Dioxide; D015040:Zirconium
D003738:Dental Cements; D003764:Dental Materials; D019279:Resin Cements; D012822:Silicon Dioxide; C023506:Glass ceramics; D015040:Zirconium; C028541:zirconium oxide