Microtensile bond strength of resin-based composites to Ti-6Al-4V.
OBJECTIVE
The purpose of this study was to determine the microtensile bond strength of various resin composite/adhesive systems to alumina particle abraded Ti-6Al-4V substrate after aging for 24h, 10 days, and 30 days in distilled water at 37 degrees C.


METHODS
Four laboratory resin composite veneering systems (Gradia, GR; Solidex, SOL; Ceramage, CER; and Sinfony, SF) were bonded to 25 mm diameter machined disks of Ti-6Al-4V with their respective adhesive and methodology, according to the manufacturer's instructions. Microtensile bars of approximate dimensions 1 mm x 1 mm x 6 mm were prepared for each resin composite/adhesive system. After cutting, groups (n=12) from each adhesive system were separated and either stored in water at 37 degrees C for 24h (baseline) or aged for 10 or 30 days prior to loading to failure under tension at a cross head speed of 1.0mm/min. Failure modes were determined by means of scanning electron microscopy (SEM). Statistical analysis was performed through one-way ANOVA and Tukey's test at 95% level of significance.


RESULTS
Significant variation in microtensile bond strength was observed for the different systems and aging times. SOL and GR showed the highest mean bond strength values followed by SF and CER at baseline. Aging specimens in water had an adverse effect on bond strength for SOL and CER but not for the SF and GR groups.


CONCLUSIONS
In vitro bond strength of laboratory resin composites to Ti-6Al-4V suggests that strong bonds can be achieved and are stable for certain systems, making them useful as an alternative for esthetic fixed prosthetic restorations.
Fernandes
Carlos A
CA
Department of Restorative Dentistry, Federal University of Ceará Dental School, Ceará, Brazil.
Ribeiro
José C
JC
Larson
Brian S
BS
Bonfante
Estevam A
EA
Silva
Nelson R
NR
Suzuki
Marcelo
M
Thompson
Van P
VP
Coelho
Paulo G
PG
D000497:Alloys; D003188:Composite Resins; D003722:Dental Alloys; D001840:Dental Bonding; D003799:Dental Stress Analysis; D019544:Equipment Failure Analysis; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D013718:Tensile Strength; D014025:Titanium; D014867:Water
D000497:Alloys; D003188:Composite Resins; D003722:Dental Alloys; D019279:Resin Cements; D014867:Water; C031462:titanium alloy (TiAl6V4); D014025:Titanium