Chai J(1), Tan E, Pang IC. 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). Introduction: To assess the impact of using preventive mouthwash agents on the surface hardness of various resins composites. 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. their effect on the surface properties of aesthetic dental restorative materials is controversial [5]. Materials and methods: Hundred specimens were prepared from five types of composite resin material in a Teflon mold. 1. The cold temperatures did not produce changes in the surface roughness or microhardness of the three restorative dental materials selected. 2.3.2. Sufficient hardness ensures that the placed restorations are resistant to in-service scratching, from both mastication and abrasion. 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). The Barcol hardness of the top surface is compared with that of the bottom surface. 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 Reports have stated that the alcohol in mouthrinses may soften the resin-composite restorations [6]. Hardness is a property that is measured by scientific instruments that press a special tip into the surface of the test material. 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. Oldest test employed for determining the hardness of metals; A hardened steel ball is pressed under a specified load into the polished surface of a material. The tip has a characteristic shape made of a very hard material, such as steel or diamond, as shown in Figure 3.3 . In both tea and coffee, the top surfaces tended to be Hardness is an important mechanical property of dental materials and is defined as the resistance to permanent surface indentation. 10% decrease in Barcol hardness of a resin composite results in a 20% decrease in the flexural strength. Brinell Hardness Test. CAD/CAM (computer-aided design/computer-aided manufacturing) for indirect restorative materials has been recently introduced in dentistry. 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