Effect of gallic acid addition on some mechanical properties of self-adhesive resin cements.

Bebek Serra Oguz Ahmet,Arzu Tezvergil Mutluay,Mustafa Murat Mutluay,Gulsum Sayin Ozel

doi:10.1590/1807-3107bor-2019.vol33.0053

Bebek Serra Oguz Ahmet, Arzu Tezvergil Mutluay + Show 2 more

Open Access

https://doi.org/10.1590/1807-3107bor-2019.vol33.0053

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Abstract

Self-adhesive resin cements (RCs) activate matrix metalloproteinase (MMP) and cathepsin-related collagen degradation, and gallic acid (GA) inhibits the activity of both MMPs and cysteine cathepsins. The purpose of this study was to evaluate the setting time, biaxial flexural strength, and Vickers hardness of self-adhesive RCs after the addition of two different concentrations of GA. RelyX U200 (3M ESPE) and Panavia SA (Kuraray) were modified with 0.5 and 1 wt% GA. The setting time of five samples in each RC group was assessed using a thermocouple apparatus as described in the ISO 4049 test. Biaxial flexure strength was measured using a universal testing machine until failure. Vickers hardness was measured with three randomized indentations on the surface of each resin disc. RCs without GA were used as control. Data were analyzed using a one-way analysis of variance and Tukey's HSD test (α = 0.05). The setting times ranged from 2.4 to 4.6 min for RelyX and from 4.9 to 6.0 min for Panavia. The biaxial flexure strength ranged from 76.5 to 109.7 MPa for RelyX and from 73.3 to 108.2 MPa for Panavia. Vickers hardness values ranged from 41.6 to 58.6 for RelyX and 27.2 to 33.6 for Panavia. The addition of 0.5 and 1 wt% GA to improve durability of resin-dentin bonds had no adverse effects on setting time, whereas the biaxial flexure strength and Vickers hardness values for the tested materials were significantly reduced.

Highlights

Ceramic restorations are important for the current aesthetically driven dental practice
Addition of 0.5% and 1% gallic acid (GA) did not have any significant effect on the setting time values for both resin cements (RCs) (p > 0.05)
For Panavia samples, addition of 0.5% GA resulted in a significant decrease (p < 0.05) in the Vickers hardness values, whereas the addition of 1% GA did not have any significant effect (p > 0.05)

Summary

Introduction

Ceramic restorations are important for the current aesthetically driven dental practice. Apart from inlays and onlays, which are fabricated after minimal reduction of tooth structure, all-ceramic full crowns require adhesive cementation.[1] clinicians have increased the use of self-adhesive RCs based on filled polymers, partially because of the simplicity of their application which does not require separate etching and bonding procedures. Various proprietary products have been introduced in the market owing to the ease of application of these luting cements.[2]. The success of adhesively bonded restorations depends on the bond strength between the resin–restoration and resin–dentin interface. The latter interface, known as “hybrid layer,” is created by the infiltration

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