Dental Materials

Introduction The science of dental materials involves a study of the composition and properties of materials and the way in which they interact with the environment in which they are placed Selection of Dental materials The process of materials selection should ideally follow a logical sequence involving (1) analysis of the problem, (2) consideration of requirements, (3) consideration of available materials and their properties, leading to (4) c…

Casting ring CASTING RING LINERS Most common way to provide investment expansion is by using a liner in the casting ring .Traditionally asbestose was used . Non asbestose ring liner used are : 1) Aluminosilicate ceramic liner . 2) Cellulose paper liner . The aim of using a resilient liner is to -. allow different types of investmentbexpansion (act as a cushion) _. facilitate venting during casting procedure. _. facilitate the removal of the investme…

Investment Materials Investment is mold-making material Applications a. Mold-making materials for casting alloys b. Mold-making materials for denture production Classification a. Gypsum-bonded investments (based on gypsum products for matrix) b. Phosphate-bonded investments c. Silicate-bonded investments Components a. Liquid-water or other reactant starts formation of matrix binder by reacting with reactant powder b. Powder-reactant powd…

Denture Cleansers Use -  for removal of soft debris by light brushing and then rinsing of denture; hard deposits require professional repolishing a. Alkaline perborates-do not remove bad stains; may harm liners . b. Alkaline peroxides-harmful to denture liners c. Alkaline hypochlorites-may cause bleaching, corrode base-metal alloys, and leave residual taste on appliance d. Dilute acids-may corrode base-metal alloys e. Abrasive powders and creams-can a…

Composition of Acrylic Resins. ·        Powder. The powder is composed of a polymethyl methacrylate (PMMA), peroxide initiator, and pigments ·        Liquid. The liquid is a monomethyl methacrylate (MMA), hydroquinone inhibitor, cross-linking agents, and chemical accelerators (N, N-dimethyl-p-toluidine)…