Enhancing Adhesion through Monomer Infiltration into Dentin States

Nakabayashi N
Kojima K
Masuhara E
The promotion of adhesion by the infiltration of monomers into tooth states.
J Biomed Mat Res. 1982;

Authors: N. Nakabayashi, K. Kodjima, and E. Masuhara Abstract: The influence of monomer infiltration on the adhesion between resin and dentin was investigated. Dentin samples were etched with 37% orthophosphoric acid for 15 seconds, followed by a 15-second water rinse. Subsequently, the samples were either air-dried or treated with various monomers. The sample surfaces were examined using scanning electron microscopy (SEM). The results showed that monomer infiltration into acid-etched dentin led to the formation of a more homogeneous and dense dentin surface. Additionally, the dentin surface impregnated with monomers exhibited fewer open dentinal tubules than the surface of acid-etched, air-dried dentin. These findings suggest that monomer infiltration can result in a more homogeneous and dense surface of acid-etched dentin, improving the adhesion between resin and dentin.

Introduction: Adhesion between resin and dentin is a crucial factor for the long-term success of composite resin restorations. One approach to enhance adhesion between resin and dentin involves using adhesives that penetrate into acid-etched dentin. These adhesives can form chemical bonds with collagen in dentin, improving the adhesion between resin and dentin.One of the most common types of adhesives used to enhance adhesion between resin and dentin is monomer-based adhesives. These adhesives contain monomers that can penetrate into acid-etched dentin and form chemical bonds with collagen in the dentin.The aim of this study was to investigate the impact of monomer infiltration on the adhesion between resin and dentin. The research hypothesis posited that monomer infiltration into acid-etched dentin would result in a more homogeneous and dense dentin surface, thereby improving the adhesion between resin and dentin

Materials and Methods:

Dentin Samples: Dentin samples were obtained from recently extracted human wisdom teeth. The teeth were cleaned of soft tissues and sliced into 2 mm thick plates. The plates were then embedded in acrylic resin and polished to achieve a flat surface.

Acid Etching: Dentin samples were etched with 37% orthophosphoric acid for 15 seconds. Subsequently, the samples were rinsed with water for 15 seconds.

Monomer Infiltration: Samples were either air-dried or treated with various monomers. The monomers used in this study included: • GMA (glycidyl methacrylate) • TEGMA (triethylene glycol methacrylate) • Bis-GMA (bisphenol A glycidyl methacrylate)Samples were treated with monomers for 15 seconds, followed by a water rinse for 15 seconds.

Scanning Electron Microscopy (SEM): The surfaces of the samples were examined using scanning electron microscopy (SEM). The samples were coated with a thin layer of gold and observed using SEM.

Results: The results indicated that monomer infiltration into acid-etched dentin led to the formation of a more homogeneous and dense dentin surface. Additionally, the dentin surface impregnated with monomers exhibited fewer open dentinal tubules than the surface of acid-etched dentin air-dried.

Discussion: The findings of this study suggest that monomer infiltration can result in a more homogeneous and dense surface of acid-etched dentin. This may improve the adhesion between resin and dentin.