1 / 23

Introduction to Dental Materials

Introduction to Dental Materials. Three basic classes of materials : Metals Polymers Ceramics. Metals. At the atomic level , the atoms are bonded together by metallic bond. -metallic luster. -excellent electrical and thermal conductivity. -ability to be shaped (malleability).

wardah
Download Presentation

Introduction to Dental Materials

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Introduction to Dental Materials

  2. Three basic classes of materials: • Metals • Polymers • Ceramics

  3. Metals At the atomic level , the atoms are bonded together by metallic bond. -metallic luster. -excellent electrical and thermal conductivity. -ability to be shaped (malleability). -strength, hardness, and high density. -Opaque

  4. Metals • What is alloy? • Mixture of 2 or more metals • What is metal?? • Metals versus alloys in dentistry.

  5. Types of metals in dentistry: • Noble (gold, pt, Pd, ….. • Semi-noble ( old term).gold is replaced with silver • Non-noble.

  6. Metals • Preformed metals: • Cohesive gold • Amalgam • Wrought wires

  7. Metals • Casting metals The restoration is fabricated outside the mouth utilizing the lost wax technique.

  8. POLYMERS • They are widely used in dentistry. Polymers versus plastics??? Plastic is any material cabable to be shaped . Ductile metals considered as plastic

  9. Polymers: this term means many parts Polymerisation: process by which the monomer is converted into polymer.

  10. Polymers They are bonded by covalent bonding along the backbone, and ionic bonding . Polymers are prepared in form of dough then shaped into desired shapes. They harden by: -physical reaction,(cooling, or evapration). Waxes, -chemical reaction,

  11. Types • Impression. • Waxes. • Denture bases. • TCRM.

  12. Ceramics • They are made of metallic oxides. • Porcelain. Produced by sintering • Glass, produced by melting and fusion of the oxides.

  13. ceramics • They are bonded by ionic bonds. • No free electron to conduct heat or electricity. • Poor thermal conductor • Stable ,biocompatible • Trasparent.شفاف • Traslucency, due to air bubles • Three dimensional crystal structure. • Brittle

  14. Types of ceramics • Porcelain • Gypsum • Investment • Cements

More Related