Sufficient hardness ensures that the placed restorations are resistant to in-service scratching, from both mastication and abrasion. their effect on the surface properties of aesthetic dental restorative materials is controversial [5]. Introduction: To assess the impact of using preventive mouthwash agents on the surface hardness of various resins composites. Hardness is a property that is measured by scientific instruments that press a special tip into the surface of the test material. A study of the surface hardness and dimensional stability of several intermaxillary registration materials. Materials and methods: Hundred specimens were prepared from five types of composite resin material in a Teflon mold. On the surface hardness of a dental resin composite material Decky J. Indrani, Triaminingsih S, Nurvanita, Andhesti, Noviana Department of Dental Materials Science Faculty of Dentistry Universitas Indonesia ABSTRACT Previous study has shown that dental resins exhibited changes in the surface hardness when soaked in alcoholic beverages. Chai J(1), Tan E, Pang IC. 1. 10% decrease in Barcol hardness of a resin composite results in a 20% decrease in the flexural strength. Reports have stated that the alcohol in mouthrinses may soften the resin-composite restorations [6]. immersed in cola for 30 days had the lowest surface hardness (33.20), whereas rough specimens of hybrid composite material immersed in cola for 24 hours had the highest surface hardness (156.00). The success or failure of a given material may be as dependent on its properties in the liquid state as it is on its properties as a solid. In terms of microhardness, the results from those studies are contradictory.6–12 Studies reported an increase,7 decrease9 or no change6,8,10–11 in composite surface hardness The cold temperatures did not produce changes in the surface roughness or microhardness of the three restorative dental materials selected. Brinell Hardness Test. In both tea and coffee, the top surfaces tended to be CAD/CAM (computer-aided design/computer-aided manufacturing) for indirect restorative materials has been recently introduced in dentistry. The purpose of this study was to evaluate the change of the surface micro-hardness of different restorative CAD/CAM materials after exposure to a carbonated acidic drink (Coca-Cola, Coca-Cola Company, Milan, Italy). 2.3.2. However, both alcohol-containing and alcohol-free mouthrinses could affect the hardness of restorative materials … Author information: (1)Advanced Education Prosthodontics, Northwestern University Dental School, Chicago, IL 60611, USA. 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