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. Reports have stated that the alcohol in mouthrinses may soften the resin-composite restorations [6]. Chai J(1), Tan E, Pang IC. In both tea and coffee, the top surfaces tended to be 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). Brinell Hardness Test. However, both alcohol-containing and alcohol-free mouthrinses could affect the hardness of restorative materials … 1. 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). 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. 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. A study of the surface hardness and dimensional stability of several intermaxillary registration materials. The Barcol hardness of the top surface is compared with that of the bottom surface. Author information: (1)Advanced Education Prosthodontics, Northwestern University Dental School, Chicago, IL 60611, USA. 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. Materials and methods: Hundred specimens were prepared from five types of composite resin material in a Teflon mold. The tip has a characteristic shape made of a very hard material, such as steel or diamond, as shown in Figure 3.3 . materials was used following the ASTM-G-53 standards1. 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. Introduction: To assess the impact of using preventive mouthwash agents on the surface hardness of various resins composites. Sufficient hardness ensures that the placed restorations are resistant to in-service scratching, from both mastication and abrasion. 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