Wedad Y Awliya.
Surface hardness and weight change of some aesthetic restorative materials.
J Pak Dent Assoc Jan ;14(2):84-9.

OBJECTIVE: The aim of this study was to test the effect of two mouthrinses on the weight change and microhardness of four aesthetic restorative materials, (composite resin, compomer, resin modified glass ionomer and glass ionomer cement). MATERIALS AND METHODS: Thirty cylindrical disks from each material were fabricated, then these were divided into three groups each group containing ten teeth. The weight of each sample in all groups was recorded prior to testing. Then two groups from each material were soaked in one of the two mouthrinses for a total of 24 hours that was reported to be equivalent in time to 1 year of 4 min daily use. The third group from each material was soaked in distilled water to serve as control. Each day for three days, experimental specimens were placed in the specific mouthrinse for 8 hours. At the end of each 8-hour period, specimens were taken out, rinsed, dried and then their weight was recorded. Surface hardness of all samples in each group was recorded prior to testing and after the end of the total 24 hours. RESULTS: The results indicated that the mouthrinses used in the study (Orasept, and Listerin), time and material were significant factors for weight change of the esthetic materials. Microharhness of all materials, except the compomer were adversely affected by immersion in the Listerin mouthrinse. However, in Oracept mouthrinse only the resin modified glass ionomer cement and the glass-ionomer cements were adversely affected. CONCLUSIONS: The results of this study indicated that the increase in weight loss associated with a consequent increase in surface disintegration. Also, alcohol in mouthrinses was not the only detrimental factor that might affect the hardness of the restorative materials.

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