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Problems with Polymers in Dentistry

✍ Scribed by Grant, Alan

Publisher
Wiley (John Wiley & Sons)
Year
1978
Tongue
English
Weight
405 KB
Volume
10
Category
Article
ISSN
0007-1641

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✦ Synopsis

Abstract

Despite the important contributions made by polymers in dental treatment procedures, many shortcomings of these materials are apparent. Rigid type denture base polymers (commonly P.M.M.A.) have low impact and abrasion resistance and lack radiopacity. Resilient polymers used as denture liners may bond poorly to the denture base and suffer changes in physical properties in use. Early problems of colour stability, high polymerisation and thermal contraction, low surface hardness and poor abrasion resistance of the first polymeric filling materials have been only partly overcome by the introduction of polymer/ceramic composites.

In dental cement applications, present bonding systems include unfilled dimethacrylates, which do not attach to dentine. A system based on polyacrylic acid, or copolymers thereof, is believed to bond chemically to the calcium in tooth structure, but the bond to dentine is poorer than that to enamel and also the hydrolytic stability is suspect.

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