By John F. McCabe, Angus Walls
This textbook covers all elements of fabrics technology suitable to the perform of dentistry. it truly is aimed essentially at undergraduate dental scholars, even though it can also be precious for working towards dentists, dental technicians and dental assistants.
The ninth version has been commonly revised to incorporate the various advances in dental fabrics and their use that experience happened in the past 9 years. The chapters on Resin-based filling fabrics and Adhesive restorative fabrics were improved considerably with new assurance of fibre reinforcement of composite buildings and polymerisable luting brokers. a new bankruptcy has been additional on endodontic fabrics.
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Extra resources for Applied Dental Materials (9th Edition)
The test sample is dipped into an aqueous solution of sodium sulphide hydrate for 10–15 seconds once every minute over a period of 3 days. Treated and untreated specimens are compared visually to determine if any discolouration has occurred. The test recognizes that tarnish is most commonly associated with the formation on the surface of metallic sulphides. 8 Biological properties It is a primary requirement of any dental material that it should be harmless to the patient and to those involved in its manufacture and handling.
Heating in warm water causes more regular softening although this method has been frowned upon since it was thought that some constituents may be leached out and small quantities of water may become incorporated causing an alteration in properties. These problems are probably overstated since most waxes contain few leachable components. The method of softening used in standardization testing of waxes involves the use of a 250 W infra-red lamp. When using this method, the distance of the wax from the lamp must be carefully 42 Chapter 4 controlled in order to cause softening but not melting.
The way in which the preceding argument relates to certain dental adhesives is illustrated in Fig. 24. 24a represents a cross-section through acid etched enamel. 24b illustrates the situation which may exist when a resin is applied. Close adaptation and penetration of the resin into the enamel surface has not occurred due to poor wetting and/or the viscosity of the resin being too great. In Fig. 24c a resin of low Fig. 24 Diagram illustrating application of a resin adhesive A to an etched-enamel surface B.