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Clin Oral Invest (2013) 17:19111918
DOI 10.1007/s00784-012-0884-0
ORIGINAL ARTICLE
Hydrolytic stability of three-step etch-and-rinse adhesives in occlusal class-I cavities
Jan De Munck & Atsushi Mine & Marcio Vivan Cardoso &
Kirsten L. Van Landuyt & Anne-Katrin Lhrs &
Andr Poitevin & Masao Hanabusa & Takuo Kuboki &
Bart Van Meerbeek
Received: 30 June 2012 /Accepted: 19 November 2012 /Published online: 1 December 2012 # Springer-Verlag Berlin Heidelberg 2012
AbstractObjectives A dental adhesive without small and hydrophilic monomers such as 2-hydroxyethyl methacrylate (HEMA) and triethylene glycol dimethacrylate (TEGDMA) would be beneficial in order to avoid contact allergies. However, these monomers are important to increase infiltration and polymerization of the adhesive. Therefore, the purpose of this study was to evaluate the bonding effectiveness and bond durability of a more hydrophobic and biocompatible adhesive as compared to a conventional three-step etch-and-rinse adhesive. Methods Sixteen non-carious human third molars were used to determine the micro-tensile bond strength testing (TBS) and interfacial ultrastructure by transmission electron microscopy (TEM) of the more hydrophobic cmf adhesive system (Saremco) adhesive as compared to the control OptiBond FL (Kerr).
Results The more hydrophobic and biocompatible three-step etch-and-rinse adhesive was able to produce a reasonable
short-time bonding effectiveness. In the long term, the collagen fibrils in the hybrid layer were not effectively protected and were prone to hydrolytic degradation. As a result, long-term bonding effectiveness of this novel adhesive was very low.
Conclusions Application of a more hydrophobic adhesive without altering the application procedure considerably results in a reduced durability of the created bondClinical relevance Omitting small and hydrophilic components from the adhesive formulation may impair the durability of your composite restoration.
Keywords Class-I cavity dentin . Bond strength . TEM . Three-step etch-and-rinse . Durability . Allergy
Introduction
Methacrylates such as 2-hydroxyethyl methacrylate (HEMA) and triethylene glycol dimethacrylate (TEGDMA) are often used in dental adhesives [1]. Cross-linking methacrylate monomers such as TEGDMA provide immediate mechanical strength to the adhesive system by forming densely cross-linked polymers. Hydrophilic monomers, such as HEMA, are considered equally important components of dental adhesives thanks to their wetting enhancement effect [2]. However, these methacrylate monomers have proved to be potent contact allergens [3]. Therefore, an adhesive without these small and hydrophilic monomers might cause fewer allergies. Moreover, an adhesive...