OBJECTIVES:Transient collagen cross-linking treatment by proanthocyanidins (PA), a natural crosslinker, was proved to increase the cross-linking degree and ultimate tensile strength of demineralised dentin. The present study aimed to investigate whether transient pretreatment by PA-based preconditioner can improve the resin-dentin bonds of various etch and rinse adhesives. The influence of solvent type, PA concentration and treatment duration were examined. METHODS: PA-based preconditioners were prepared by adding powdered grape seed extract, rich in PA, to various solvents at different concentrations. They were used on demineralised dentin before the application of the bonding agent. Bond strength, failure modes and degree of conversion were evaluated via microtensile testing, field emission scanning electron microscopy and Fourier transform infrared spectroscopy, respectively. RESULTS: Collagen cross-linking treatment by PA-based preconditioners presented a concentration- and time-dependent increase in dentin bond strength even in reduced, clinically applicable treatment duration. PA preconditioning improved bond strength of the tested water/ethanol-based adhesive better than the water/acetone-based system. Mixed fracture was the most prevalent failure mode happened on the top of the hybrid layer in PA-pretreated specimens, whilst at the bottom in non-treated controls. The degree of conversion was not significantly affected by PA pretreatment. CONCLUSIONS: Transient PA preconditioning improved resin-dentin bonds without compromise on the curing behaviours of the tested adhesives.
RCT Entities:
OBJECTIVES: Transient collagen cross-linking treatment by proanthocyanidins (PA), a natural crosslinker, was proved to increase the cross-linking degree and ultimate tensile strength of demineralised dentin. The present study aimed to investigate whether transient pretreatment by PA-based preconditioner can improve the resin-dentin bonds of various etch and rinse adhesives. The influence of solvent type, PA concentration and treatment duration were examined. METHODS:PA-based preconditioners were prepared by adding powdered grape seed extract, rich in PA, to various solvents at different concentrations. They were used on demineralised dentin before the application of the bonding agent. Bond strength, failure modes and degree of conversion were evaluated via microtensile testing, field emission scanning electron microscopy and Fourier transform infrared spectroscopy, respectively. RESULTS: Collagen cross-linking treatment by PA-based preconditioners presented a concentration- and time-dependent increase in dentin bond strength even in reduced, clinically applicable treatment duration. PA preconditioning improved bond strength of the tested water/ethanol-based adhesive better than the water/acetone-based system. Mixed fracture was the most prevalent failure mode happened on the top of the hybrid layer in PA-pretreated specimens, whilst at the bottom in non-treated controls. The degree of conversion was not significantly affected by PA pretreatment. CONCLUSIONS: Transient PA preconditioning improved resin-dentin bonds without compromise on the curing behaviours of the tested adhesives.
Authors: Leo Tjäderhane; Fabio D Nascimento; Lorenzo Breschi; Annalisa Mazzoni; Ivarne L S Tersariol; Saulo Geraldeli; Arzu Tezvergil-Mutluay; Marcela Carrilho; Ricardo M Carvalho; Franklin R Tay; David H Pashley Journal: Dent Mater Date: 2013-08-14 Impact factor: 5.304
Authors: Ana Beatriz Silva Sousa; Cristina M P Vidal; Ariene Arcas Leme-Kraus; Fernanda C P Pires-de-Souza; Ana K Bedran-Russo Journal: Dent Mater Date: 2016-08-11 Impact factor: 5.304
Authors: Ana K Bedran-Russo; Guido F Pauli; Shao-Nong Chen; James McAlpine; Carina S Castellan; Rasika S Phansalkar; Thaiane R Aguiar; Cristina M P Vidal; José G Napotilano; Joo-Won Nam; Ariene A Leme Journal: Dent Mater Date: 2013-12-03 Impact factor: 5.304