Influence of adhesive properties on resin-dentin bond strength of one-step self-etching adhesives.
OBJECTIVE
To evaluate the association between the resin-dentin bond strength (microtensile bond strength, μTBS) and the physical properties (ultimate tensile strength [UTS] and microhardness [VHN]) of the cured adhesive resin using five commercial one-step self-etching systems.


METHODS
Futurabond NR, Go, G Bond, 1-step All Bond SE and Clearfil S3 Bond were applied on flat superficial dentin surfaces. Each adhesive system was applied in five teeth. A resin buildup was then made. After 24 h, resin-dentin beams (0.9 mm2) were prepared to be tested immediately at 0.5 mm/min. For the UTS measurement, hourglass specimens were prepared with each adhesive system (n = 5) to be tested under tensile stress at 0.5 mm/min. The fractured specimens from the UTS test were taken to a Vickers microhardness tester (25 gf/20 s). μTBS, UTS, and VHN values were submitted to a one-way ANOVA and Tukey's test (α = 0.05) for pairwise comparisons. Correlations between μTBS, UTS and VHN were analyzed using the Pearson product moment correlation test (α = 0.05).


RESULTS
Significantly higher μTBS values were observed for 1-step All Bond SE and Clearfil S3 Bond (p > 0.05). The adhesive All Bond SE showed the highest UTSmean among all systems (p < 0.05). The adhesives All Bond SE and G-Bond showed the highest microhardness mean among all systems (p < 0.05). A strong (r = 0.93) and significant (p = 0.021) correlation was only found between the μTBS and UTS values.


CONCLUSIONS
The ultimate tensile strength of one-step self-etching systems correlates with the resin-dentin bond strength values.
State University of Ponta Grossa, Parana, Brazil.
Viviane
V
Hass
Michele S
MS
Folkuenig
Alessandra
A
Reis
Alessandro Dourado
AD
Loguercio
D000134:Acid Etching, Dental / Q000379:methods*; D000268:Adhesiveness; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006244:Hardness; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D017655:Silicon Compounds / Q000737:chemistry; D016369:Smear Layer; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
C074864:All-Bond system; D017554:Carbon Compounds, Inorganic; C084111:Charisma composite resin; C505694:Clearfil S3 Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C498353:G-Bond; C532472:Go self-etching primer; D008689:Methacrylates; D019279:Resin Cements; D017655:Silicon Compounds; C512545:futurabond NR; D014867:Water; C022088:silicon carbide