Effect of Nano-Filled Protective Coating and Different pH Enviroment on Wear Resistance of New Glass Hybrid Restorative Material.

Sandra Brkanović,Silvana Jukić Krmek,Dražen Mezdić,Ivana Miletić,Ana Ivanišević

doi:10.3390/ma14040755

Abstract

The purpose of the study was to determine the wear rate of Equia Forte HT Fil with Equia Forte Coat or without coating and compare it with Fuji IX GP high-viscosity glass ionomer cement (GIC) in conditions with acid load or at neutral pH. The samples were stored for 7 days: (1) in artificial saliva, (2) in artificial saliva and cyclically exposed to low pH, and (3) in distilled water and cyclically exposed to low pH. Wear was determined by measuring the difference in mass before and after brushing in an abrasion testing device. The wear of Fuji IX GP was significantly higher than that of Equia Forte HT Fil with or without coating (p = 0.000). The difference between Equia Forte HT Fil with and without Coat was not statistically significant (p < 0.803). The differences in wear resistance between samples stored in saliva and in distilled water were not significant (p = 0.588). Periodic exposure to the low pH solution significantly affected the wear resistance of all materials (p = 0.000). Equia Forte HT Fil was more resistant to wear than Fuji IX GP in all storage conditions. A resinous coat did not significantly increase wear resistance.

Highlights

Glass ionomer cement (GIC) was invented in 1969 by Wilson and Kent, followed by McLean and Wilson introducing it to dentistry in the 1970s [1]
The results of our study showed that the wear of the glass hybrid material is significantly lower than the wear of the high-viscosity glass ionomer, under all pH conditions
The results showed that the Equia Forte Fil has higher wear resistance than the new generation Fuji IX (Fuji IX GP Extra) and the Fuji IX

Summary

Introduction

Glass ionomer cement (GIC) was invented in 1969 by Wilson and Kent, followed by McLean and Wilson introducing it to dentistry in the 1970s [1]. It is a two-component system based on a powder and a liquid formula. The powder contains calcium fluoroaluminosilicate glass particles, and the liquid is an aqueous solution of a homopolymer of polyacrylic acid or a copolymer of polyacrylic and maleic or itaconic acid [2,3,4]. GIC is a bioactive material that chemically bonds to hard dental tissues by ionic bonding mechanisms. Due to a number of qualities—such as biocompatibility and low toxicity, good adhesion to enamel and dentin, pulp protection, reduced volumetric shrinkage, and the release of fluoride ions (i.e., caries-protection)—

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