Resin-dentin interfacial morphology and shear bond strengths to primary dentin after long-term water storage: an in vitro study.
OBJECTIVE
To evaluate the resin-dentin interfacial morphology and shear bond strength of several new dentin bonding systems on deep dentin of primary teeth after a 1-year storage period.


METHODS
Test specimens were prepared using 5 adhesive systems (Syntac Single-Component [Ivoclar Vivadent], Prime And Bond NT [Dentsply DeTrey], Adper Prompt L-Pop [3M ESPE], Gluma One Bond [Heraeus Kulzer], and iBond [Heraeus Kulzer]) on primary deep dentin. The shear bond strength data were evaluated with Kruskal-Wallis and Mann-Whitney U tests. Debonding surfaces were examined with stereo-microscope and scanning electron microscopy (SEM).


RESULTS
The 1-day shear bond strength test values were, respectively, Adper Prompt L-Pop > iBond > Prime And Bond NT > Gluma One Bond > Syntac Single-Component, with the differences between Prompt L-Pop and Syntac (U = 10, P = .006), Prompt L-Pop and Gluma (U = 7, P = .002), and Adper Prompt L-Pop and iBond (U = 16, P = .03) being statistically significant. The 365-day shear bond strength values were, respectively, Adper Prompt L-Pop > Prime And Bond NT > iBond > Syntac Single-Component > Gluma One Bond, with the differences between Adper Prompt L-Pop and Syntac (U = 0, P = .000), Adper Prompt L-Pop and Gluma (U = 1, P = .000), and Adper Prompt L-Pop and iBond (U = 13, P = .01) being statistically significant. The differences between the 1-day and 365-day subgroup values of Syntac (U = 18; P = .05) and Gluma (U = 1, P = .000) were statistically significant. Almost all specimens showed adhesive failure at stereoptical examination (P > .05), with the presence of resin remnants and tags on dentin and dentinlike remnants on resin surfaces at SEM.


CONCLUSIONS
Syntac and Gluma group values decreased with aging. The best values were obtained with both Adper Prompt L-Pop groups.
Tulunoglu
Ozlem
O
Department of Pedodontics, University of Gazi, Faculty of Dentistry, Ankara, Turkey.
Tulunoglu
Ibrahim
I
D000134:Acid Etching, Dental / Q000379:methods; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008963:Molar; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties; D013997:Time Factors; D014094:Tooth, Deciduous; D014867:Water
D017220:Dentin-Bonding Agents; D019279:Resin Cements; D014867:Water