Influence of multimode universal adhesives and zirconia primer application techniques on zirconia repair.
BACKGROUND
More information is needed on the efficacy of the new universal adhesives and on the best 10-methacryloyloxydecyl dihydrogen phosphate- (MDP)-containing primer protocol to promote adhesion to zirconia.


OBJECTIVE
The aim of this study was to evaluate the influence of 2 new multimode MDP-containing adhesives and several application protocols of a zirconia primer on the shear bond strength (SBS) of composite resin to zirconia.


METHODS
Sixty zirconia (3Y-TZP) blocks were abraded (50 μm Al2O3) and divided into 6 experimental groups (n=10): one Z-Prime Plus coat without light polymerization; one Z-Prime Plus light-polymerized coat; two Z-Prime Plus coats without light polymerization; two Z-Prime Plus light-polymerized coats; All-Bond Universal; and ScotchBond Universal Adhesive. Multimode adhesives were applied according to the manufacturers' recommendations. After composite resin (Filtek Z250) light polymerization, the specimens were stored in distilled water (37°C/48 hours) and tested in shear (1 mm/min). Failure mode was classified as adhesive or mixed. Statistical analysis of the SBS data was performed with 1-way ANOVA followed by the Student-Newman-Keuls post hoc tests. Nonparametric tests (Kruskal-Wallis) were used to analyze the failure mode data (α=.05).


RESULTS
The ScotchBond Universal Adhesive, All-Bond Universal, and two Z-Prime Plus light-polymerized coats groups showed a higher mean SBS than the other experimental groups (P<.05). The 3 groups with the lowest mean SBS registered 100% of adhesive failures.


CONCLUSIONS
The new multimode adhesives tested were effective in promoting adhesion between composite resin and zirconia. Z-Prime Plus should be applied in 2 light-polymerized coats to promote SBS values similar to those of the new multimode adhesives.
Assistant Professor, Department of Dental Materials and Imagiology, Faculty of Dental Medicine, University of Lisbon, Lisbon, Portugal. Electronic address: bseabra@campus.ul.pt.
Bruno
B
Seabra
Associate Professor and Head, Department of Geriatric Dentistry, Faculty of Dental Medicine, University of Lisbon, Lisbon, Portugal.
Sofia
S
Arantes-Oliveira
Associate Professor and Head, Department of Dental Materials, Faculty of Dental Medicine, University of Lisbon, Lisbon, Portugal.
Jaime
J
Portugal
D000537:Aluminum Oxide / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D017269:Dental Prosthesis Repair; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000379:methods; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
C074864:All-Bond system; D003188:Composite Resins; D003764:Dental Materials; C444701:Filtek Z250; D008689:Methacrylates; D019279:Resin Cements; C499362:yttria stabilized tetragonal zirconia; D014867:Water; D015019:Yttrium; C069749:methacryloyloxydecyl dihydrogen phosphate; C041330:Scotchbond; D015040:Zirconium; D000537:Aluminum Oxide