By J. Anthony von Fraunhofer
Dental fabrics at a look, 2nd version, is the most recent identify within the hugely renowned At a Glance sequence, delivering a concise and obtainable creation and revision relief. Following the universal, easy-to-use at a Glance layout, each one subject is gifted as a double-page unfold with key proof observed through transparent diagrams encapsulating crucial information.
Systematically geared up and succinctly added, Dental fabrics at a Glance covers:
• every one significant classification of dental fabric and biomaterial
• easy chemical and actual properties
• medical dealing with and application
• issues and opposed results of materials
Dental fabrics at a Glance is the fitting significant other for all scholars of dentistry, citizens, and junior clinicians. additionally, the textual content will supply worthy perception for normal dental practitioners eager to replace their fabrics wisdom and be of instant software for dental hygienists, dental nurses, dental assistants, and technicians.
Read Online or Download Dental Materials at a Glance (2nd Edition) PDF
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Extra resources for Dental Materials at a Glance (2nd Edition)
Example text
1), and elastic, more compressible materials have greater latitude in use. 2. After tray removal from the mouth, the impression requires about 30 minutes to recover before pouring up. 1 Alginate (irreversible) hydrocolloids Alginate, a powder/water (P/W) system setting by sol–gel transition, is widely used for primary impression taking and for study casts. It has good elastic properties but poor long-term stability. 1). The setting reaction is K·alginate + CaSO4 → Ca·alginate + K2SO4, retarded by Na3PO4, which preferentially reacts with Ca2+ until exhausted; formation of insoluble Ca alginate causes mix gelation; additional agents provide desirable properties.
Compound must be seated before it can cool. Having low thermal conductivity, impression compound must be warmed thoroughly in a water bath at 50°C for good flow. Flow increases rapidly on warming, from 2–3% at 34° to approximately 95% above 45°C. Prolonged water bath immersion causes leaching of components; likewise, incautious heating with a flame can cause ignition and/or volatilization of constituents. Loss of low MW components causes compound to become grainy and brittle. 2); it is used to make primary impression trays.
With Newtonian fluids, flow is proportional to applied load but there is no such proportionality for non-Newtonian fluids; many impression materials are non-Newtonian. The yield value of a fluid is the minimum applied load for flow to occur whereas viscosity is its resistance to flow. Thixotropy is the term applied to a fluid or semirigid gel that resists flow when static but which flows upon agitation. Most impression materials set by chemical reaction upon mixing, setting being accelerated by the temperature rise upon tray insertion into the mouth.