Microtensile Bond Strength and Failure Type Analysis of Self-Etch Adhesive Systems on Superficial and Deep Dentin After Long-term Water Storage

Pinar Cevik,Arzu Zeynep Yildirim,Zafer Artvin,Mutlu Özcan

doi:10.14295/bds.2020.v23i4.2072

Pinar Cevik, Arzu Zeynep Yildirim + Show 2 more

Open Access

https://doi.org/10.14295/bds.2020.v23i4.2072

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Abstract

Objective: The aim of this study was to evaluate and compare the microtensile bond strengths of four current adhesive materials that contain different monomers at deep and superficial dentin. Material and Methods: Forty non-carious human third molars (n = 5) were used in the study. Specimens were divided into two main groups according to dentin thickness as superficial and deep dentin. Groups were further divided into four subgroups in terms of the adhesive systems used: Nova Compo B Plus (NCBP), Nova Compo B (NCB), Futurabond M (FB) and Clearfil S3 Bond Plus (CS3). All specimens were bonded to resin composite and stored in 37 °C water for 9-months. Teeth were sectioned into 3 x 3 mm x 1mm thick beams. Microtensile bond strength test was carried out by using a universal testing device (1 mm/min). After fracture, failure types were observed using an optical microscope and the fractured dentin surfaces were observed by a scanning electron microscopy (SEM). One-way ANOVA and Tukey tests were used to compare the adhesive system in each dentin group. An unpaired T-test was used to compare the dentin thickness in each adhesive material. Results: As compared to deep dentin, superficial dentin showed higher µTBS values in groups NCBP, FB and CS, as opposed to group NCB. Only NCB revealed higher bond strength at deep dentin layers when compared to superficial dentin. In the superficial dentin group, NCBP showed the highest bond strength value, while NCB showed the lowest bond strength. In the deep dentin group, while NCB showed the highest bond strength value, NCBP revealed the lowest bond strength value after 9-months storage. While 4-META and 10-MDP monomer combination (NCBP) resulted in the highest bond strength value among the adhesive systems in the superficial dentin group, the monomer combination (NCB) resulted in the highest bond strength in deep dentin group. Conclusions: Microtensile bond strength performance are affected by both the type of monomer in the adhesive combination and the depth of the dentin. KEYWORDS Adhesive system; dentin thickness; hydrophobic monomer; microtensile bond strength; scanning electron microscopy.

Highlights

With dentin bonding, the final goal is the achievement of a long-lasting and durable interface with resin bonds which will protect the restoration from secondary caries [1,2]
The null hypothesis was that different adhesive systems containing different monomers and dentin thickness would not affect microtensile bond strength between resin composite and dentin after long-term water storage
Given the results of this study the following conclusions may be drawn: The null hypothesis was that different adhesive systems containing different monomers and dentin thickness would not affect microtensile bond strength between resin composite and dentin after long-term water storage

Summary

Introduction

The final goal is the achievement of a long-lasting and durable interface with resin bonds which will protect the restoration from secondary caries [1,2]. It is micro-mechanical hybridization that causes adhesion to dentin substrate and this is a process that involves the infiltration of adhesive monomers that are polymerized in-situ within the microporous collagen framework, which has been stripped of minerals [1,3,4]. This is because water absorption causes polymers to swell up and plasticize and can lead to the three-dimensional polymer chain network being weakened [10,11]

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Discussion

Conclusion