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The Journal of Adhesive Dentistry



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J Adhes Dent 18 (2016), No. 6     3. Jan. 2017
J Adhes Dent 18 (2016), No. 6  (03.01.2017)

Page 529-534, doi:10.3290/j.jad.a37359, PubMed:27933323

Assessing Collagen and Micro-permeability at the Proanthocyanidin-treated Resin-Dentin Interface
Aydin, Berdan / Hassan, Lina Saleh / Viana, Grace / Bedran-Russo, Ana K.
Purpose: To establish a fluorescence-based method to simultaneously assess micro-permeability and collagen cross-linking induced by chemical agents at the resin-dentin interface.
Materials and Methods: Three chemical agents were investigated (proanthocyanidin-rich grape seed extract: GSE; carbodiimide hydrochloride/N-hydroxysuccinimide: EDC/NHS; glutaraldehyde: GD) along with a control (distilled water) as primers applied on flat occlusal dentin surfaces of 48 teeth and restored with two commercially available etch-and-rinse adhesives. Resin-dentin interfaces were polished and infiltrated with rhodamine-B solution for confocal laser scanning microscopy analysis. Parameters were chosen that would allow acquisition of a simultaneous appearance of collagen and interfacial micro-permeability (rhodamine-B). Fluorescence emission intensity (FEI) was converted into numerals and values were calculated for each group. Data were statistically analyzed using one-way ANOVA and post-hoc Scheffe's and multiple comparisons tests (α = 0.05). T-tests with Pearson correlations were used to investigate correlations between collagen cross-linking and micro-permeability.
Results: The FEI of collagen was the highest for GD, followed by GSE, with no significant differences between EDC/ NHS and the control group (p > 0.05). Micro-permeability was significantly affected by the adhesives (p < 0.05). Micro- permeability was the lowest for GSE groups, regardless of the adhesives (p < 0.001). Weak correlations were found between micro-permeability and collagen auto-fluorescence.
Conclusions: Non-enzymatic collagen cross-linking induced by GSE and GD can be detected by increased collagen auto-fluorescence, and results in reduced interfacial micro-permeability. Increased collagen auto-fluorescence was correlated with fluorescent collagen cross-links and decreased micro-permeability at the resin-dentin interface. Collagen auto-fluorescence is a useful tool to detect auto-fluorescent exogenous cross links and their potential impact on the quality of the resin-dentin interface.

Keywords: dentin, collagen fluorescence, proanthocyanidins, dental adhesives, permeability