Impact of Storage Time on Microtensile Bond Strength and Nanoleakage Expression of Universal Adhesives on Dentin: Literature Review.

Document Type : Original Article

Authors

1 Conservative Dentistry Department,Faculty of Dentistry,Mansoura Univeristy, Mansoura, Egypt

2 Conservative Dentistry Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt

Abstract

The goal of restorative dentistry is to restore the structure, functionality, and appearance of damaged or carious teeth. The success of both direct and indirect restorative operations depends on choosing and using the right adhesive agent among the large variety of adhesives available. Dentin adhesion is more difficult than enamel. One of the main challenges in dentin adhesion is smear layer. It’s defined as a zone of tooth preparation debris spread on the surface. As a result, different adhesive strategies were suggested for dentin as self-etch (SE), to etch and rinse (ER) and selective enamel etching (SEE). Self-etch and universal adhesive systems were introduced in dentistry to reduce and facilitate the clinical application and to overcome some of the drawbacks of ER as greater number of steps, longer application time, technique sensitivity and difficulty in controlling dentin wetness. Universal adhesives are made of three compositions which are cross-linking monomers, functional monomers and spacer. In this review, two methods of tesing the bond strength of adhesives were stated; microtensile bond strength test and nanoleakage test. Microtensile bond strength is the uniform stress strain field, which is important to achieve most of the failure on the bond interface. The major advantage of the μTBS test is that the researchers can focus on clinically relevant substrate with three-dimensional surfaces. The primary cause of nanoleakage are pores up to 50 nanometers which occur between hybrid layer and intact dentin even without the formation of actual gaps.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 5
Conservative Dentistry and Endodontics
July 2025
Pages 2581-2594

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