Dental Material Science 1

At the end of this course, students should be able to: 1. discuss the science underpinning the use of the gypsum, resins, and impression materials; 2. recognise where these materials can be used; 3. recognise different impression trays and know their advantages and limitations; 4. define shrinkages, and itemise their causes and how to ameliorate them; 5. state the uses, advantages, and disadvantages of dental wax; and 6. describe the physical properties of polishing materials and how to handle them.

The Science of Gypsum and Gypsum Products. Production. Chemistry of Setting: Properties of Die and Cast Materials. Manipulation. Technical consideration: - Porosity. Warpage. Shrinkage. Hygroscopic Expansion and many others. Synthetic Resins: Classification of Dental Resins: Polymerization. Types Copolymerisation. Cross Linkages. Uses in density. Other applications: soft liners. tissue conditioners. and denture cleaners. Technical Consideration: - Shrinkages. porosity crazing. and processing stresses. Impression materials: Classification of impressions. requirements of impressions materials. Impression trays: Types and uses. Classification of impression materials: elastic and non-elastic impression materials. Compositions. Properties. Requirements. and Technical considerations. Waxes: Classification. Compositions. Abrasive and Polishing materials.