Podcast
Questions and Answers
What is one primary use of diagnostic casts?
What is one primary use of diagnostic casts?
Which quality is NOT required for casts used for removable partial dentures?
Which quality is NOT required for casts used for removable partial dentures?
How thick should the base of the cast be at the thinnest area?
How thick should the base of the cast be at the thinnest area?
What is the preferred characteristic of the peripheral roll in a cast?
What is the preferred characteristic of the peripheral roll in a cast?
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What must be ensured regarding the side walls of the cast?
What must be ensured regarding the side walls of the cast?
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What is the primary purpose of making impressions in dental procedures?
What is the primary purpose of making impressions in dental procedures?
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Which impression material is commonly used for diagnostic casts?
Which impression material is commonly used for diagnostic casts?
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Which step involves soaking the cast before the second pour in the Modified Two Stage Technique?
Which step involves soaking the cast before the second pour in the Modified Two Stage Technique?
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What consistency should the dental stone have during the initial mixing for cast fabrication?
What consistency should the dental stone have during the initial mixing for cast fabrication?
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What is a defining characteristic of diagnostic casts?
What is a defining characteristic of diagnostic casts?
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How long does it take for the dental stone to completely set after the first pour?
How long does it take for the dental stone to completely set after the first pour?
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Which of the following is NOT typically made with Type III artificial dental stone?
Which of the following is NOT typically made with Type III artificial dental stone?
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When using the dental vibrator during the first pour, what should you ensure?
When using the dental vibrator during the first pour, what should you ensure?
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Study Notes
Care of Impressions and Making Casts
- Removable Partial Dentures, 2020, Georges SAYEGH
- Focuses on the care of impressions and making casts for removable partial dentures.
Content
- Definitions: Explains key terms related to impression making, cast fabrication and procedures.
- Impression Making: Describes the importance of impression-making skills for diagnostic casts required in patient treatment planning. An irreversible hydrocolloid material (alginate) is used for making impressions for diagnostic casts.
- Preliminary Impression Materials: Lists alginate and impression compound as preliminary impression materials.
- Alginate Impressions: Used to create diagnostic casts and removable partial dentures. Impressions should be poured soon after being taken.
- Cast Fabrication: Details the Modified Two-Stage Technique for cast fabrication. This includes steps like weighing dental stone, zeroing out the weight of the bowl, mixing the stone and water, and achieving a creamy consistency.
- Step 3: First Pour: Gently vibrates the dental stone into the impression, filling each tooth individually.
- Step 4: Second Pour: Soaks the first pour, mixes stone, builds a "patty", and inverts the impression into the patty to completely fill.
- Types of Casts: Covers diagnostic, working, and refractory casts, each with specific uses. Diagnostic casts are life-sized reproductions for study and treatment planning. Working casts form the basis of a prosthesis, while refractory casts withstand high temperatures without disintegration.
- Diagnostic Casts: Detailed description of diagnostic casts. These are life-size reproductions of oral structures, used to assess hard and soft tissues of the maxillary and mandibular jaws for treatment planning. They're typically made from artificial dental stone type III.
- Uses of Diagnostic Casts: Lists individual uses of diagnostic casts, including occlusal analysis, soft tissue assessment, hard tissue assessment, fabrication of splints, custom trays, provisional restorations and other.
- Requisites for Casts: Outlines the critical qualities of casts for removable partial dentures. All surfaces contacted by the prosthesis should be accurate, free of voids and nodules. The surface of the cast should be hard and dense, free of any grinding sludge. The cast extensions need to extend for denture support.
- Additional Cast Requirements: The peripheral roll should be complete and have a specified depth. The side walls of the cast are vertical (or slightly tapered outwards, but not undercut). The base needs a minimum thickness of 15 mm. The lingual region should be trimmed flat and show no signs of being wet or brushed.
- Troubleshooting Guide (Problems & Solutions): Addresses issues like voids in the impression, impression separation, chalky cast surfaces, voids on cast surfaces, casts being too thin or thick or areas getting trimmed away or broken casts. Provides solutions for each issue. (e.g., voids in the impression require obtaining a new impression, while chalky cast surfaces require improvement of the water-powder ratio.)
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Description
This quiz covers essential concepts regarding the care of impressions and the making of casts for removable partial dentures. It explores key terms, procedures for impression making, preliminary materials, and the Modified Two-Stage Technique for cast fabrication. Enhance your understanding of dental practices through this informative quiz.
