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Abstract
This study evaluated the effect of coating agents during complete setting on the surface microhardness of highly viscous glass ionomer cement/resin coatings after immersion in citric acid solution. A total of 104 specimens (52 specimens per product) of highly viscous glass ionomer cement/resin coating (EF; EQUIA Forte, GC) and highly viscous glass ionomer cement (FN; Fuji IX GP, GC), 10 mm. diameter and 1.5 mm thickness, were divided into 4 groups each (13 specimens/group) according to a coating method; uncoated control groups (EF, FN), resin-coated and polished groups (EFCP, FNCP), petroleum jelly-coated groups (EFP, FNP), and resin-coated groups (EFC, FNC). Specimen microhardness values were measured for baseline data. All specimens were immersed in 5 ml of citric acid solution and microhardness was measured again on day 3 and 7. One-way ANOVA with repeated measurement was used to analyze the analytical statistics and Tukey's HSD and t-test was used for multiple comparisons (a=0.05).
After 7 days of immersion, group FNC had the highest surface microhardness and had a statistically significant difference from other groups (P<0.05).
In conclusion, Fuji IX GP coated with EQUIA Forte Coat (group FNC) was suitable for dental restoration in acid challenge condition.
Keywords: Citric acid solution, Highly viscous glass ionomer cement, Highly viscous glass ionomer cement/resin coating, Surface microhardness.
Received date: 15 June 2021_Accept date: 19 July 2021_I
Introduction
Atraumatic restorative treatment (ART) is an alternative method for dental caries management. ART uses only hand instruments, which is the least invasive method, to completely remove necrotic carious tooth tissue and conserve partially demineralized dentine.1 It aims to prevent caries and stop the progression of caries down to deeper layers.2 ART is suitable for all situations and can be used either in general clinics or in the field; for example, in nursing homes or the patient's home.3 The material selected for the ART technique is highly viscous glass ionomer cement,2 which yields better mechanical properties than other restorative materials.4-6
ART protocol consists of a cavity preparation and a restoration procedure with a glass ionomer cement, which requires a mixer to prepare a material. When the material is ready mixed, the material was injected into the cavity and condensed with an index finger against the cavity. The excess material was removed with...