Resistance to demineralisation of adjacent enamel and dentine, fluoride release and dentine bond strength of fluoride-containing self-etch adhesive systems

M Pirmoradian,E Asgari,B Sanaee,S Habibzadeh,K Shekofteh,B Albakhakh,S Esmailzadeh,M Behroozibakhsh,S Davaie

doi:10.4317/jced.56170

M Pirmoradian, E Asgari + Show 7 more

Open Access

https://doi.org/10.4317/jced.56170

Copy DOI

Abstract

BackgroundThe current study aimed to assess the amount of fluoride released from fluoride-containing dental adhesives and its effect on micro-tensile bond strength (µTBS) and on resistance to demineralisation of dentine and enamel. Material and MethodsTwo fluoride-containing dental adhesives, and a fluoride-free adhesive were used as experimental adhesives. After thermal cycling the µ-TBS of adhesives to dentine and the failure mode were assessed. The fluoride release and cross-sectional microhardness (CSMH) of specimens were measured before and after one day, 7 and 28 days of pH-cycling. The data were analysed using one-way ANOVA, Weibull statistics and repeated measures ANOVA. ResultsThe results indicated a significant difference between the group of FL and both the SE and LBF groups (p≤0.001). The CSMH values of both the dentine and enamel underneath the adhesives was reduced at 28 th day of the pH-cycling compared to the baseline (p≤0.001). From day 1 to day 28, the released fluoride declined in both the fluoride containing dental adhesives (p≤0.001). ConclusionsBased on the results, the released fluoride from dental adhesives may adversely influence the bond strength and durability of the resin/dentine interface. Moreover, the released fluoride didn’t improve the resistance to demineralisation of adjacent enamel and dentine to bond interface. Key words:Fluoride release, micro-tensile bond strength, microhardness, fluoride-containing adhesives.

Highlights

Secondary caries is one of the main causes of resin composites failures. Such failures may be due to an improper marginal seal at the interface of tooth structure and restorative material or demineralisation of adjacent enamel and dentine to dental adhesives [1]
Several researchers added fluoride fillers with different sources to dental restorative materials to inhibit secondary caries, and just a variety of fluoride-containing dental materials including glass-ionomers, hybrid-ionomers, resin composites and dental adhesives are available in the market [4]
The cariostatic effect of fluoride containing dental materials is attributed to the amount of fluoride released from the materials as well as the ability of fluoride to incorporate into the adjacent tooth structures [9]

Summary

Introduction

Secondary caries is one of the main causes of resin composites failures Such failures may be due to an improper marginal seal at the interface of tooth structure and restorative material or demineralisation of adjacent enamel and dentine to dental adhesives [1]. Several researchers added fluoride fillers with different sources to dental restorative materials to inhibit secondary caries, and just a variety of fluoride-containing dental materials including glass-ionomers, hybrid-ionomers, resin composites and dental adhesives are available in the market [4]. It seems that enhancement of remineralisation is the most likely mechanism in this regard. The released fluoride didn’t improve the resistance to demineralisation of adjacent enamel and dentine to bond interface

Objectives

Methods

Findings

Conclusion