Abstract
Aim and Background. Recently, new restorative materials such as self-adhesive flowable composites, because of their simple use and no need to bonding and etching, are considered important, particularly in pediatric dentistry. The aim of this study is to evaluate the effect of Er,Cr:YSGG laser on microshear bond strength of self-adhesive flowable composite on permanent teeth dentin in vitro. Material and Methods. In this experimental study, 40 dentin sections were prepared from healthy third molars and divided into two groups according to their surface preparation by Er,Cr:YSGG laser or without laser, only with silicon carbide paper. In each group, two groups of 10 teeth were treated with self-adhesive flowable composite (Dyad) and conventional flowable composite (acid etch and bonding). Samples were stored in normal saline and after 48 hours their bond strength was measured. The failure mode of samples was observed on stereomicroscope. In order to analyse the results, the one way ANOVA and Tukey's test for multiple comparisons were used. Result. The maximum bond strength was related to conventional flowable composite with laser preparation group (24/21 Mpa). The lowest one was seen in Dyad composite without laser emitting (9/89 Mpa). The statistical difference between this two groups was significant (P value = 0/0038). The microshear bond strength differences between Dyad composite groups with laser preparation (mean = 16/427 ± 1/79) and without laser preparation (mean = 12/85 ± 1/90) were statistically significant too (P value = 0/01). Conclusion. Self-adhesive flowable composite has lower microshear bond strength than conventional flowable composite. Moreover, the laser irradiation as a surface treatment can improve this bond strength.
Highlights
The demand for cosmetic services and maintenance of the tooth structure leads to further development of adhesive materials which act through bonding to the enamel and dentin
The highest microshear strength value was observed in conventional flowable composite group which was prepared by silicon carbide and laser irradiation
The lowest microshear bond strength value was observed in Dyad composite group which was prepared by silicon carbide (Figure 1)
Summary
The demand for cosmetic services and maintenance of the tooth structure leads to further development of adhesive materials which act through bonding to the enamel and dentin. The new generation of these composites, the so-called self-adhesive flowable composites, can be bonded to tooth structures without using adhesive systems according to its manufactures’ claim. The aforementioned feature of these composites is due to acidic monomer in its composition. Another feature includes GPDM monomer, that is, functional phosphate group, which bonds chemically to carbon ions in tooth surface, and etches dentin and enamel. There are two functional methacrylate groups which polymerized by other methacrylate monomers which result in adhesive mechanical strength improvement. The bond strength of this composite is similar to other self-etch adhesives [1]
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