Podcast
Questions and Answers
What is the purpose of making an impression?
What is the purpose of making an impression?
- To produce a cast of the teeth
- To examine the patient's oral hygiene
- To produce a positive replica over which a dental restoration can be constructed (correct)
- To construct a dental restoration directly
Why is it necessary to examine old dentures before making impressions?
Why is it necessary to examine old dentures before making impressions?
- To determine the patient's oral hygiene
- To examine the denture's material
- To evaluate the fit and occlusion of the denture (correct)
- To determine the patient's age
What should be done to the dentures before making impressions?
What should be done to the dentures before making impressions?
- Soak them in a disinfectant
- Remove them from the patient's mouth for 24-48 hours (correct)
- Clean them with soap and water
- Leave them in the patient's mouth
What is the final step in tissue preparation for impressions?
What is the final step in tissue preparation for impressions?
What is a cast?
What is a cast?
Why is tissue preparation necessary?
Why is tissue preparation necessary?
What is the primary purpose of a primary impression?
What is the primary purpose of a primary impression?
What is the advantage of using a stock tray?
What is the advantage of using a stock tray?
What is the purpose of the floor of a stock tray?
What is the purpose of the floor of a stock tray?
Why is it important to block out undercuts in the mouth before making an impression?
Why is it important to block out undercuts in the mouth before making an impression?
What is the purpose of a custom tray?
What is the purpose of a custom tray?
What material is often used to line a custom tray?
What material is often used to line a custom tray?
What type of flanges are characterized by less modifications?
What type of flanges are characterized by less modifications?
What is the significance of recording anatomical landmarks in mandible?
What is the significance of recording anatomical landmarks in mandible?
What is the purpose of pouring primary impressions?
What is the purpose of pouring primary impressions?
What are the characteristics of an acceptable impression material mix?
What are the characteristics of an acceptable impression material mix?
What is the significance of borders in impression taking?
What is the significance of borders in impression taking?
What type of trays is used to record the impression of a full arch?
What type of trays is used to record the impression of a full arch?
What is the purpose of identifying supporting structures in impression taking?
What is the purpose of identifying supporting structures in impression taking?
What type of resin is commonly used in denture construction?
What type of resin is commonly used in denture construction?
Study Notes
Mouth Preparation and Primary Impression
- An impression is a negative reproduction of teeth and/or adjacent structures from which a positive replica (cast) can be made.
- The purpose of an impression is to produce a cast over which a dental restoration can be constructed.
Patient Preparation
- A denture should not be constructed unless the supporting tissues are in an acceptable condition.
- Existing dentures should be examined for fit and occlusion, and corrected temporarily with tissue conditioning material if necessary.
- Dentures should be removed from the patient's mouth for 24-48 hours before making impressions.
- Tissue preparation/conditioning involves clinical examination, correction of denture, application of tissue conditioning material, oral hygiene instructions, tissue massage, and rinse with warm water and salt.
Impressions for Complete Dentures
- Primary impressions are made using a stock tray, which is then used to construct a custom tray.
- Secondary impressions are made using the custom tray to produce a master cast.
Stock Trays
- Stock trays are ready-made, come in different sizes and forms, and can be adapted to fit the patient's mouth.
- They allow addition or removal of material and can be bent to fit the patient's mouth.
- The tray should be checked for size and adjusted by adding wax or trimming the border.
Tray Components
- A tray consists of a floor, body, flanges, and handle.
- The floor and flanges make up the body of the tray.
Tray Types
- Trays can be metal (aluminum or stainless steel) or non-metal (plastic).
- Perforated trays are used for alginate impressions, while non-perforated trays are used for impression compound.
Anatomical Landmarks
- Anatomical landmarks include peripheral, supporting, and relief areas.
- Examples of anatomical landmarks in the mandible include the labial frenum, labial vestibule, lingual frenum, buccal frenum, and buccal vestibule.
Primary Cast
- A primary cast is used to study the ridge shape, palatal vault shape, denture bearing areas, areas of undercut, relief areas, posterior palatal seal area, sharp bony edges, depth of the sulcus, inter-ridge space, and inter-ridge relations.
- It is constructed for each patient and provides more accurate information due to its customized nature.
- Types of primary cast materials include acrylic resin and shellac.
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Description
Learn about the importance and process of taking dental impressions and creating casts for restorative dental work.