![]() Reversible Hydrocolloid an agar impression material that can be heated to change a gel into a fluid sol state that can flow around the teeth, then cooled to gel again to make an impression of the shapes of the oral structures Hydrocolloid a water-based colloid used as an elastic impression material Key Terms defined within the chapterĭiagnostic Casts positive replicas of the teeth produced from impressions that create a negative representation of the teeth commonly called study models and used for diagnostic purposes and numerous chairside and laboratory proceduresīite Registration an impression of the occlusal relationship of opposing teeth in centric occlusion (patient’s normal bite)Ĭolloid glue-like material composed of two or more substances in which one substance does not go into solution but is suspended within another substance it has at least two phases, a liquid phase called a sol and a semisolid phase called a gel Discuss the uses of inelastic impression materials and why they are seldom used today. Explain why some impression materials should be poured immediately and others can wait until later.Ģ2. Explain the difference between a hydrophobic and a hydrophilic impression material.Ģ1. Explain the most advantageous clinical feature that polyether impression materials possess.Ģ0. Explain why polyvinyl siloxane impression material is so popular.ġ9. List the uses of polysulfide impression material and discuss its advantages and disadvantages.ġ8. List the uses of polyether impression material and discuss its advantages and disadvantages.ġ7. Discuss similarities and differences among the physical properties of the various elastomers.ġ6. ![]() Describe the different types of elastomers and explain why they are called elastomers.ġ5. Apply troubleshooting to problems experienced with alginate impressions.ġ4. Demonstrate the proper handling of alginate impressions.ġ3. List criteria for an acceptable alginate impression.ġ2. Demonstrate mixing alginate, loading and seating the tray, and removing the impression.ġ1. Demonstrate tray selection for alginate impressions for a patient.ġ0. List the supplies needed to make an alginate impression and explain how they are used.ĩ. Explain why alginate is an irreversible hydrocolloid.Ĩ. List the components of alginate impression material and discuss their functions.ħ. Define sol and gel and describe these states as they occur with the hydrocolloids.Ħ. Describe the factors that make agar hydrocolloid a reversible material.ĥ. Describe important characteristics of impression materials.Ĥ. List the various categories of impression materials and explain their differences.ģ.
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