Crown Types
What is a full crown?
A full crown completely covers the anatomic crown of an individual tooth.
Name one material used for indirect restorations.
Gold, porcelain-fused-to-metal (PFM), porcelain, composite-resin, or zirconia.
What is the first step in creating an indirect restoration?
The laboratory receives the prescription, final impression, and bite registration.
What is involved in the first appointment for a crown?
The first appointment includes shade selection, preliminary impressions, bite registration, tooth preparation, and final impressions.
What does CAD/CAM stand for?
Computer-Aided Design/Computer-Aided Manufacturing.
Describe the three-quarter crown.
A three-quarter crown covers the anatomic crown of a tooth but leaves the facial portion unchanged.
What is porcelain-fused-to-metal (PFM)?
PFM is a material used for creating indirect restorations that combines the strength of metal with the aesthetics of porcelain.
Define a die in the context of dental labs.
A die is an exact replica of the prepared tooth.
Describe the shade selection process.
Shade selection is determined by matching the color of the adjacent teeth using a shade guide.
Describe the purpose of CAD/CAM technology in fixed prosthodontics.
CAD/CAM technology is used to design the anatomic features, size, and shape of a tooth restoration.
What is an implant-supported crown?
An implant supported crown is an alternative to traditional crowns, consisting of an implant, abutment, and crown.
What is all-ceramic?
All-ceramic materials are used for indirect restorations, providing high aesthetic value and translucency.
What is a wax pattern?
A wax pattern is created for casting from the die of the prepared tooth.
What is the purpose of provisional coverage?
Provisional coverage reduces sensitivity, maintains function and esthetics, protects margins, and prevents shifting of adjacent teeth.
How does CAD/CAM improve efficiency?
CAD/CAM allows for quicker design, fabrication, and customization of restorations, reducing the number of appointments.
What is a fixed bridge?
A fixed bridge is recommended when either one tooth or multiple teeth are missing withing the same quadrant and consists of units and pontics.
Explain the use of zirconia.
Zirconia is used in indirect restorations for its strength and aesthetic properties, often used in crowns and bridges.
Describe the "burnout" process.
The burnout process involves placing the casting ring in an oven, where the wax is burned away, leaving a negative pattern in the investment material.
What is gingival retraction?
Gingival retraction is the process of managing bleeding and saliva and widening the sulcus using retraction cords.
Name one advantage of computer-assisted restorations.
One advantage is the precision and accuracy in creating restorations that fit better than traditional methods.
Define a pontic
A pontic is the artificial tooth in a fixed bridge that replaces the missing tooth.
What is composite-resin?
Composite-resin is a material used for indirect restorations, known for its aesthetic qualities and ability to bond to tooth structure.
What happens after the casting is cooled?
The casting is placed in water to aid in the removal of investment material, and the sprue button is removed before polishing.
Explain the role of retention pins.
Retention pins provide additional support for crowns when the coronal portion of a tooth is extensively decayed or fractured.
What types of restorations can CAD/CAM be used for?
CAD/CAM can be used for veneers, inlays, onlays, crowns, and bridges.