J Korean Acad Conserv Dent.  2011 Jul;36(4):280-289. 10.5395/JKACD.2011.36.4.280.

Effect of adhesive hydrophobicity on microtensile bond strength of low-shrinkage silorane resin to dentin

• Cho SY
• Kang HY
• Kim KA
• Yu MK
• Lee KW

• KMID: 1986690
• DOI: http://doi.org/10.5395/JKACD.2011.36.4.280

Abstract

OBJECTIVES
The purpose of this study was to evaluate microTBS (microtensile bond strength) of current dentin bonding adhesives which have different hydrophobicity with low-shrinkage silorane resin.
MATERIALS AND METHODS
Thirty-six human third molars were used. Middle dentin was exposed. The teeth were randomly assigned to nine experimental groups: Silorane self-etch adhesives (SS), SS + phosphoric acid etching (SS + pa), Adper easy bond (AE), AE + Silorane system bonding (AE + SSb), Clearfil SE bond (CSE), CSE + SSb, All-Bond 2 (AB2), AB2 + SSb, All-Bond 3 (AB3). After adhesive's were applied, the clinical crowns were restored with Filtek LS (3M ESPE). The 0.8 mm x 0.8 mm sticks were submitted to a tensile load using a Micro Tensile Tester (Bisco Inc.). Water sorption was measured to estimate hydrophobicity adhesives.
RESULTS
microTBS of silorane resin to 5 adhesives: SS, 23.2 MPa; CSE, 19.4 MPa; AB3, 30.3 MPa; AB2 and AE, no bond. Additional layering of SSb: CSE + SSb, 26.2 MPa; AB2 + SSb, 33.9 MPa; AE + SSb, no bond. High value of microTBS was related to cohesive failure. SS showed the lowest water sorption. AE showed the highest solubility.
CONCLUSIONS
The hydrophobicity of adhesive increased, and silorane resin bond-strength was also increased. Additional hydrophobic adhesive layer did not increase the bond-strength to silorane resin except AB2 + SSb. All-Bond 3 showed similar microTBS & water sorption with SS. By these facts, we could reach a conclusion that All-Bond 3 is a competitive adhesive which can replace the Silorane adhesive system.

Keyword

Adhesive hydrophobicity; Dentin bonding system; Microtensile bond strength; Silorane resin; Water sorption test

MeSH Terms

Adhesives
Crowns
Dentin
Humans
Hydrophobic and Hydrophilic Interactions
Methacrylates
Molar, Third
Phosphoric Acids
Resin Cements
Silorane Resins
Tooth
Water
Adhesives
Methacrylates
Phosphoric Acids
Resin Cements
Silorane Resins
Water

Figure

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  Figure 1 Diagram of measuring microtensile bond strength.

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  Figure 2 Failure mode and µTBS analysis. High value of µTBS was related to cohesive failure Water sorption & solubility. SS, Silorane self-etch adhesives; SS + pa, Silorane self-etch adhesives + phosphoric acid etching; AE, Adper easy bond; CSE, Clearfil SE bond; AB2, All-Bond 2; AB3, All-Bond 3; AE + SSb, Adper easy bond + Silorane system bonding; CSE + SSb, Clearfil SE bond + Silorane system bonding; AB2 + SSb, All-Bond 2 + Silorane system bonding.

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