Effects of Dentin Conditioning Mode and Aging on Multimode Adhesives
Objectives: To evaluate the effect of artificial aging and conditioning protocols on the resin-dentin bond strengths of two multimode dental adhesives. Methods: 32 flat dentin surfaces from sound extracted human molars were polished with 320-grit SiC paper and randomly divided into two adhesives groups All-Bond Universal™, Bisco Inc, (ABU), and ScotchBond Universal™, 3M/ESPE, (SBU); and further divided into 4 sub groups according to the dentin conditioning method: 35% H3PO4 (PA15s); 35% H3PO4 (PA5s); EDTA 17% (EDTA30s); or self–etching (SE) (20s). Adhesive application followed the manufacturer’s instructions and 4-mm resin composite build-ups (Aelite, Bisco, IL, USA) were incrementally added and light-cured (Bluephase G2, Ivoclar Vivadent) at 1100mW/cm2. The specimens were stored in distilled water (24 hours, 37°C) and sectioned into beams (0.7mm2). Samples were tested immediately or after 12-month with the microtensile method (Micro Tensile Tester, Bisco) (µTBS) at 0.5 mm/min until failure. Bond strength data were analyzed separately by adhesive with two-way ANOVA and Tukey’s test (α=0.05). Failure mode was examined under light microscopy. Results: There were not significant interactions for both adhesives. There was a significant difference for treatments in ABU (P=0.002). Different etching times with PA or EDTA did not affect bond strengths of ABU, but the SE mode resulted in significantly lower bond strength. SBU was not affected by any conditioning mode. There was no reduced bond strength for all groups evaluated after 1 year. Values are in MPa(SD). Upper cases compare rows and lower cases compare columns. Conclusions: SE protocol significantly reduced the bond strength of ABU to dentin. Bond strengths were not affected by artificial aging after 1 year.
Division: IADR/AADR/CADR General Session
Meeting:2015 IADR/AADR/CADR General Session (Boston, Massachusetts) Location: Boston, Massachusetts
Year: 2015 Final Presentation ID:2298 Abstract Category|Abstract Category(s):Dental Materials 1: Adhesion - Bond Strength Testing and Mechanisms
Authors
Manso, Adriana
( The University of British Columbia - Faculty of Dentistry
, Vancouver
, British Columbia
, Canada
)
Al-mosuli, Tabarek
( The University of British Columbia - Faculty of Dentistry
, Vancouver
, British Columbia
, Canada
)
Lanza, Marcos Daniel
( The University of British Columbia - Faculty of Dentistry
, Vancouver
, British Columbia
, Canada
)
Bauer, José Roberto
( Federal University of Maranhão
, São Luiz
, Brazil
)
Vidotti, Hugo
( The University of British Columbia - Faculty of Dentistry
, Vancouver
, British Columbia
, Canada
)
Carvalho, Ricardo
( The University of British Columbia - Faculty of Dentistry
, Vancouver
, British Columbia
, Canada
)
Support Funding Agency/Grant Number: Start-up funds, Faculty of Dentistry, The University of British Columbia; Undergraduate Student Summer Research Award, Faculty of Dentistry, The University of British Columbia, FAPEMA-00617/11, CNPq 237066/2012-2, Bisco Inc. and Ivoclar Vivadent.
Financial Interest Disclosure: None