Podcast
Questions and Answers
What is the primary purpose of provisional coverage?
What is the primary purpose of provisional coverage?
For how long do patients typically wear provisional crowns or bridges?
For how long do patients typically wear provisional crowns or bridges?
Which type of provisional coverage requires more time and customization during the preparation?
Which type of provisional coverage requires more time and customization during the preparation?
What material is used in polycarbonate crowns?
What material is used in polycarbonate crowns?
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Which type of provisional is specifically designed for anterior and posterior preparations?
Which type of provisional is specifically designed for anterior and posterior preparations?
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What is the role of cellulose acetate in provisional coverage?
What is the role of cellulose acetate in provisional coverage?
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Which provisional material is available for all tooth types and is a thin clear shell?
Which provisional material is available for all tooth types and is a thin clear shell?
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What must be done with aluminum and tin crowns when contouring the gingival margin?
What must be done with aluminum and tin crowns when contouring the gingival margin?
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What is the primary concern when using stainless steel crowns for primary posterior teeth?
What is the primary concern when using stainless steel crowns for primary posterior teeth?
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What is the maximum allowed space between the crown margin and the finish line of the preparation for provisional coverage?
What is the maximum allowed space between the crown margin and the finish line of the preparation for provisional coverage?
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What type of impression is commonly used for holding the provisional material?
What type of impression is commonly used for holding the provisional material?
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What is a key recommendation when mixing powder/liquid materials?
What is a key recommendation when mixing powder/liquid materials?
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Which of the following materials is considered a type of light-polymerized material?
Which of the following materials is considered a type of light-polymerized material?
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What is a benefit of light-cured provisional materials?
What is a benefit of light-cured provisional materials?
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What is the setting time for the provisional polymer crown resin used in the preformed crown technique?
What is the setting time for the provisional polymer crown resin used in the preformed crown technique?
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What type of materials are bisacrylic composites and bis-GMA?
What type of materials are bisacrylic composites and bis-GMA?
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What is the function of the preformed crown method?
What is the function of the preformed crown method?
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Which material should be avoided when making provisional crowns due to its significant exothermic reaction?
Which material should be avoided when making provisional crowns due to its significant exothermic reaction?
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Study Notes
Provisional Coverage
- A temporary crown or bridge used to protect prepared teeth while the permanent restoration is being made
- Restores function and keeps patients comfortable during the waiting period
- Typically worn for 2 weeks to 1 month, but can be longer for complex cases
Types of Provisional Coverage
- Custom provisional: Made individually for each patient, typically used for crowns and bridges
- Prefabricated provisional: Pre-made crowns or bridges, available for single-unit teeth
Materials used for Prefabricated Provisionals
- Polycarbonate crowns: Natural appearance, available for incisors, canines, and premolars
- Polymer shell crowns: Filled with composite resin, designed for molars
- Cellulose acetate shells: Thin, clear, used to carry provisional material
- Aluminum and tin crowns: Thin, cylindrical or anatomical shells for posterior teeth
- Stainless steel crowns: Used for primary teeth when color-matching is not a primary concern
Criteria for Fabricated Provisional Crowns and Bridges
- Esthetically acceptable
- Contoured similar to natural teeth, with good interproximal contacts and alignment
- Smooth cervical margin fitting snugly to the preparation
- Not extending below the preparation margin
- Occlusal surface aligned with the occlusal plane of adjacent teeth
Common Types of Provisional Trays or Molds:
- Alginate impression
- Baseplate wax impression
- Vacuum-formed tray
- Silicone putty impression
Materials for Provisional Coverage:
-
Powder/liquid materials: Set in 5-6 minutes, mix by adding powder to liquid to minimize air bubbles
- Examples: Methyl methacrylate, Ethyl methacrylate resin
-
Paste and paste materials: Dispensed from syringes or cartridges and mixed through an automix tip
- Examples: Bisacrylic composites, Bis-GMA acrylic provisional resin
-
Light-polymerized materials: Less shrinkage, faster setting time, less toxic odor
- Example: LuxaFlow
Preformed Crown Method
- Uses prefabricated shell-like crowns of various sizes
- Crowns are made from polymer or polycarbonate material with anatomical features
- Eliminates the need for a preliminary impression or thermoplastic tray
- Resin and shell bond together for strength and optimal margins
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Description
Explore the essentials of provisional coverage in dentistry, including its purpose in protecting prepared teeth. Learn about the different types of provisional restorations, their materials, and how they function to provide comfort to patients during the transition period.
