1. PowerPoint® Presentation for Dental Materials with Labs
Module:
Laboratory Materials and Techniques: Diagnostic Casts
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2. Module: Laboratory Materials and Techniques: Diagnostic Casts
Part A: Elastomeric Impression Materials
Part B: Gypsum Materials
Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.

3. 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.
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4. Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.
Key Terms
Homogenous
Imbibition
Irreversible hydrocolloid
Monomer
Polymer
Polymerization
Polysulfide
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5. Part A: Elastomeric Impression Materials
Polysulfide
Polyether
Polysiloxane
Polyvinal
siloxane
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6. Elastomeric Impression Materials
Base
Catalyst
Two-Part
Pastes
Elastomeric
Impressions
Putty
Distortion
Accelerator
Extruding
Gun
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7. Part B: Gypsum Materials
Plaster
Die
Stone
Lab
Plaster
Gypsum
Ortho
Stone
Lab
Stone
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8. Copyright © 2006 Thomson Delmar Learning. ALL RIGHTS RESERVED.
Gypsum Materials
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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
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10. 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
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11. Finished Diagnostic Casts
Tuberosities
Retromolar areas
Frenums
Vestibules
Teeth
Gingival tissues
Professional appearance
Symmetrical cuts
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12. 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
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13. 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.