Repeated exposure of acidic beverages on esthetic restorative materials: An in-vitro surface microhardness study.

Am Xavier,K Rai,Am Hegde,Sm Sunny

doi:10.4317/jced.52906

Abstract

BackgroundA manifold increase in the consumption of aerated beverages has witnessed a twin increase in tooth wear and raised demand for esthetic restorative materials. This study aimed to evaluate the surface microhardness changes of esthetic restorative materials following treatment with aerated beverages in an in-vitro situation.Material and MethodsThe initial surface microhardness of the restorative materials GC Fuji II LC, GC Fuji IX, Nano Glass ionomer, Resin and Nano composite was recorded. These materials were studied under 3 groups that included those exposed to the acidic beverages daily, weekly once in a month and those that had no exposures at all. The final surface microhardness of the materials was recorded following experimentation and was subjected to statistical comparisons.ResultsThe restorative materials were compared for their surface microhardness changes following respective treatments using the T-test and One-way ANOVA analysis. Inter-comparisons between the groups showed statistical significance (p<.05), when treated with both the beverages. The five restorative materials revealed surface microhardness loss; the maximum reduction noticed with the Nano glass ionomer cement tested (p<.0005).ConclusionsThe surface microhardness of restorative materials markedly reduced upon repeated exposures with acidic beverages; the product with phosphoric acid producing the maximum surface microhardness loss. Key words:Restorative materials, acidic beverages, surface microhardness, resin composites, glass ionomers.

Highlights

Excessive consumption of acidic food and beverages, or unusual eating and drinking habits such as sipping an acidic drink over a long period of time have proven to increase the acid challenge to teeth [1]
The complex nature of the degradation suffered by dental materials and dental hard tissue subsequent to an erosive and cariogenic challenges, it is observed that surface microhardness assesment is an appropriate method to verify small alterations in mineral content after acid demineralization [20]
Olga Polydorou et al studied the effects of bleaching on the microhardness of composites and reported a similar decrease [22]. Variables such as titratable acidity and buffering capacity of a beverage have been suggested to be important variables in wear, the present data confirms that the total acid content or pH to be responsible for the loss of hardness in restorative materials

Summary

Introduction

Excessive consumption of acidic food and beverages, or unusual eating and drinking habits such as sipping an acidic drink over a long period of time have proven to increase the acid challenge to teeth [1]. This study aimed to evaluate the surface microhardness changes of esthetic restorative materials following treatment with aerated beverages in an in-vitro situation. Material and Methods: The initial surface microhardness of the restorative materials GC Fuji II LC, GC Fuji IX, Nano Glass ionomer, Resin and Nano composite was recorded. These materials were studied under 3 groups that included those exposed to the acidic beverages daily, weekly once in a month and those that had no exposures at all. The five restorative materials revealed surface microhardness loss; the maximum reduction noticed with the Nano glass ionomer cement tested (p

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