3 ObjectivesDiscuss some of the conditions that make the oral cavity hostile to dental materialsIdentify ideal properties of dental materialsExplain how dental materials, drugs, instruments and equipment are evaluatedSummarize the reasons the dental hygienist should be knowledgeable about the science of dental materialsName and discuss classification categories
4 Replacement Materials Restriction on use:Biting forcesDegradation of materials and teethTemperature changesBiocompatibilityEsthetics
5 Characteristics of an Ideal Dental Material BiocompatibleMechanically Stable & DurableResistant to Corrosion or ChemicalsDimensionally StableMinimally Conductive – thermal & electricalEstheticEasy to ManipulateAdherent to TissuesTasteless and OdorlessCost-effective
6 History Ancient Times to the 1700’s During the 1800’s The 20th Century Gold, Ivory, Porcelain, Wax, Gypsum, Cements (Zinc phosphate & ZOE)During the 1800’sAmalgam in use, Porcelain inlays & crownsThe 20th CenturyNew materials constantly developedVariety of cast metals: gold, chromium & nickel, chromium & cobalt, and titaniumPolymers and Composites
7 Standards for Dental Materials Medical Device Amendment of 1976FDA considers dental materials as medical devicesFDA has authority to ensure safety of dental materialsCouncil for Scientific Affairs of the ADAADA Seal of Acceptance
8 Classifications of Dental Materials by Use Restorative MaterialsRestorations & CrownsBridgesComplete & Partial DenturesImpression Casts & Models6. Cements7. Temporary Materials8. Preventive Materials9. Polishing Materials10. Implants11. Specialty Materials
9 Classification by Location of Fabrication Direct Restorative MaterialsConstructed directly in the oral cavityAmalgams, Composites, Glass ionomersIndirect Restorative MaterialsFabricated outside the oral cavityGold crowns and inlaysCeramic materialsIndirect restorative polymers
10 Classification by Longevity of Use Permanent RestorationsDon’t last forever, but give years of service
11 Longevity, con’t Temporary Restorations Planned to be replaced in a short timeInterim RestorationsLong term temporary restorations
12 DiscussionWhat are some implications of dental hygiene practice on dental materials?Why do you think this might be important?What are your thoughts about hygienists doing restorative procedures? Is this something you would enjoy doing?
Your consent to our cookies if you continue to use this website.