CAD/CAM (computer-aided design/computer-aided manufacturing) for indirect restorative materials has been recently introduced in dentistry. their effect on the surface properties of aesthetic dental restorative materials is controversial [5]. 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. 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 materials was used following the ASTM-G-53 standards1. 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. 10% decrease in Barcol hardness of a resin composite results in a 20% decrease in the flexural strength. The Barcol hardness of the top surface is compared with that of the bottom surface. 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. 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 tip has a characteristic shape made of a very hard material, such as steel or diamond, as shown in Figure 3.3 . Introduction: To assess the impact of using preventive mouthwash agents on the surface hardness of various resins composites. However, both alcohol-containing and alcohol-free mouthrinses could affect the hardness of restorative materials … In both tea and coffee, the top surfaces tended to be Materials and methods: Hundred specimens were prepared from five types of composite resin material in a Teflon mold. Brinell Hardness Test. A study of the surface hardness and dimensional stability of several intermaxillary registration materials. Hardness is an important mechanical property of dental materials and is defined as the resistance to permanent surface indentation. Author information: (1)Advanced Education Prosthodontics, Northwestern University Dental School, Chicago, IL 60611, USA. Chai J(1), Tan E, Pang IC. Hardness is a property that is measured by scientific instruments that press a special tip into the surface of the test material. 2.3.2. 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