Bonding Performance of a Hydrophilic Amide Monomer Containing Adhesive to Occlusal and Cervical Dentin.

Eri Seitoku,Shuhei Hoshika,Toru Tanaka,Shigeaki Abe,Hidehiko Sano,Takatsumi Ikeda

doi:10.3390/ma13214727

Eri Seitoku, Shuhei Hoshika + Show 4 more

Open Access

https://doi.org/10.3390/ma13214727

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Journal: Materials	Publication Date: Oct 23, 2020
License type: CC BY 4.0

Affiliation: Hokkaido University, Nagasaki University

Abstract

This study aimed to evaluate the bonding performance of a new one-step self-etching adhesive system containing a novel hydrophilic amide monomer. Clearfil Universal Bond Quick (CUB) and Clearfil Megabond 2 (CMB) were used as the one-step and two-step adhesive systems, respectively. Flat dentin surfaces of human premolars were exposed using #600 SiC (silicon carbide) and bonded with the respective adhesives of each system. The teeth were sectioned to obtain beams (1 mm × 1 mm) after 24 h of water storage. The mean bond strength and standard deviations (MPa) on an occlusal surface were as follows: CUB: 45.9 ± 19.7 and CMB: 67.9 ± 25.3. The values for cervical ones were CUB: 56.0 ± 20.3 and CMB: 67.6 ± 16.0, respectively. In both conditions, the microtensile bond strength (μTBS) value was lower than that of CMB. As seen during the microscopic observation, no adhesive failure was observed after μTBS testing because CUB formed a firm and tight adhesive interface.

Highlights

In recent years, it has been recommended that restoration should be made with minimum removal of tooth structure based on the concept of “Minimal Intervention” [1,2]
Van Landuyt et al revealed that some hydroxyethyl methacrylate (HEMA)-free 1-SEA systems contained a hydrophobic monomer mixture, with which residual water could cause phase separation and blister formation in the adhesive layer [21]
Under the limited conditions of this study, the conclusion obtained about the novel 1-SEA was as follows: The novel 1-SEA could quickly permeate the dentin, though the μTBS value was lower than that of the 2-SEA

Summary

Introduction

It has been recommended that restoration should be made with minimum removal of tooth structure based on the concept of “Minimal Intervention” [1,2]. From one point of view, composite resin restoration might be the most valuable method, because the restoration could be esthetic, handy and tooth conservative. The most crucial item would be the adhesive system. In the first stage of dental adhesives to dentin, it was performed through three steps (etching, priming and bonding). Owing to the demand for simpler as well as more user-friendly and less technique sensitive adhesives, manufacturers have developed new adhesives used in two- or one-step procedures [3]. Regarding the one-step self-etch adhesives (1-SEAs), some researchers reported their comparable bonding performance with that of two-step self-etch adhesives (2-SEAs) [4,5,6]; other researchers reported their inferior performance [7,8]

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