PowerPoint® Presentation for Dental Materials with Labs Module: Laboratory Materials and Techniques: Diagnostic Casts Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Module: Laboratory Materials and Techniques: Diagnostic Casts Part A: Elastomeric Impression Materials Part B: Gypsum Materials Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Module: Laboratory Materials and Techniques: Diagnostic Casts Learning Objectives 1. Define the Key Terms. 2. Demonstrate the knowledge and skills necessary to prepare alginate and elastomeric impression materials. 3. Demonstrate the knowledge and skills necessary to use gypsum materials. 4. Demonstrate the knowledge and skills necessary to pour and trim a diagnostic cast model. Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. Key Terms Homogenous Imbibition Irreversible hydrocolloid Monomer Polymer Polymerization Polysulfide Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Part A: Elastomeric Impression Materials Polysulfide Polyether Polysiloxane Polyvinal siloxane Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Elastomeric Impression Materials Base Catalyst Two-Part Pastes Elastomeric Impressions Putty Distortion Accelerator Extruding Gun Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Part B: Gypsum Materials Plaster Die Stone Lab Plaster Gypsum Ortho Stone Lab Stone Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. Gypsum Materials Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. Gypsum Materials Creates diagnostic cast models Incorporate water into powder Creamy mixture Avoid whipping material Correct water-powder ratio Sensitive to temperature and humidity Polymerization Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. Shaping the Models Symmetrical shape Bases even Cut sides wide to allow for heel cuts Sides parallel with row of teeth Mark with pencil before trimming Eye protection Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Finished Diagnostic Casts Tuberosities Retromolar areas Frenums Vestibules Teeth Gingival tissues Professional appearance Symmetrical cuts Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. Assessment Questions Which elastomeric impression material smells like sulphur? Polysulfide material What is the term for the setting action of the plaster or stone material? Polymerization What happens if too much water is mixed with the plaster material? It will be weak and filled with air spaces Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED. Summary of Module Key Terms Elastomeric impression materials Gypsum materials Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.