Podcast
Questions and Answers
What is the primary function of a fixed prosthesis in dentistry?
What is the primary function of a fixed prosthesis in dentistry?
Which type of crown is entirely composed of ceramic material?
Which type of crown is entirely composed of ceramic material?
What distinguishes a ceramo-metallic crown from a full metal crown?
What distinguishes a ceramo-metallic crown from a full metal crown?
In which situation would a three quarter crown be indicated?
In which situation would a three quarter crown be indicated?
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What feature characterizes a post crown?
What feature characterizes a post crown?
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Which type of crown reduces tooth surfaces except for the mesio-buccal cusp?
Which type of crown reduces tooth surfaces except for the mesio-buccal cusp?
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What is unique about the reverse three quarter crown?
What is unique about the reverse three quarter crown?
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Partial coverage crowns are retained in what manner?
Partial coverage crowns are retained in what manner?
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What is the primary purpose of a laminate veneer?
What is the primary purpose of a laminate veneer?
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Which restoration is characterized by its partial coverage and use of pinholes for retention?
Which restoration is characterized by its partial coverage and use of pinholes for retention?
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An endocrown is specifically used for which type of tooth?
An endocrown is specifically used for which type of tooth?
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What distinguishes an overlay dental restoration from an onlay?
What distinguishes an overlay dental restoration from an onlay?
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Which of the following materials can be used for fixed partial dentures (FPDs)?
Which of the following materials can be used for fixed partial dentures (FPDs)?
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In classification of fixed partial dentures, what does a pier abutment refer to?
In classification of fixed partial dentures, what does a pier abutment refer to?
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What is the defining characteristic of an inlay compared to an onlay?
What is the defining characteristic of an inlay compared to an onlay?
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Which component of a bridge is responsible for replacing the missing tooth or teeth?
Which component of a bridge is responsible for replacing the missing tooth or teeth?
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Study Notes
Prosthesis
- Definition: An artificial appliance replacing a lost body part (e.g., eye, leg, tooth).
- In dentistry, prostheses can be fixed or removable, complete or partial.
Crown
- Definition: A fixed restoration covering all or part of a tooth's crown.
- Purpose: Restores tooth anatomy, function, and aesthetics.
Classification of Crowns
By Material
- Metal: A crown made of metal.
- Non-metal: A crown made of acrylic or ceramic.
- Ceramo-metallic: A crown combining metal and ceramic (often with a ceramic veneer).
By Coverage
- Full coverage: Entire tooth crown covered. (e.g., full metal, ceramo-metallic)
- Partial coverage: Only part of the crown is covered. (e.g., 3/4, reverse 3/4, 1/2, 7/8, McBoyle crown, pin-ledge crown).
Different types of Crowns
Full Metal Crown
- An artificial crown made entirely of cast metal.
- Covers all coronal structures of posterior teeth.
Ceramic Crown
- A crown made of ceramic.
- Focuses on esthetics and function.
Ceramo-metallic Crown (CM crown) or Porcelain Fused to Metal (PFM)
- Crown with a metal substructure and a ceramic covering.
- Emphasis on aesthetics, anatomy, and function.
- Veneered crown - ceramic covering only the visible part of the crown.
- Full veneered crown - ceramic covering the entire metal substructure, for greater esthetics.
Post Crown
- Artificial crown replacing lost coronal structure.
- Retained by a post in a prepared root canal.
- Aims for aesthetics, function, and anatomy restoration.
Three-quarter Crown
- Partial coverage crown covering two proximal, lingual, or occlusal surfaces.
- Buccal/incisal surfaces remain uncovered.
- Retained by grooves in the tooth structure.
- Universal applicability (can be used in various areas of the mouth).
- Reverse type: Lingual surface left unprepared, labial/buccal surface is prepared.. Common use in lower premolars.
Proximal Half Crown (Mesial Half Crown)
- Partial coverage restoration covering only the mesial, half buccal and half lingual surfaces.
- Portion of the occlusal surface is reduced.
- Retained by grooves or other methods.
Seven-Eighth Crown
- Partial coverage, reducing all the tooth surfaces except for the mesio-buccal cusp, for aesthetic purposes.
- Grooves are present in the proximal and buccal surfaces.
Pin Ledge Crown
- Partial coverage crown.
- Retention is achieved through pins in the palatal surfaces.
- Two incisal and one cervical pinholes usually employed.
- Less common due to complex preparation.
Laminate Veneer
- Partial coverage, thin ceramic material cemented to the labial surface of anterior teeth.
- For improved aesthetics.
Occlusal Veneer
- Partial coverage, thin ceramic material on occlusal surfaces of posterior teeth.
- Aims to replace lost anatomy and increase vertical dimension of occlusion.
Other Restorations
- Onlay: A dental restoration covering the occlusal surface.
- Overlay: Covers the occlusal plus mid-buccal and mid-lingual surfaces.
- Endocrown: A ceramic restoration for endodontically treated teeth, gaining retention from the pulp chamber.
- Fixed Partial Denture (FPD, bridge): A partial denture cemented to natural teeth, tooth roots, or implants to replace missing teeth.
FPD Classification
- Material: Metal, non-metal (acrylic/ceramic), or combination (ceramo-metallic).
- Site: Anterior (canine to canine), posterior (premolars or molars), or complex (crossing the canine).
- Retention: Simple (fixed-fixed, fixed-support, fixed-free) or compound (using multiple methods).
Other restorations
- Resin bonded FPD: uses intra-oral restorations for retention (e.g., inlays). Metal or ceramic wings are sometimes found on anterior teeth (e.g., Maryland bridge).
- Fixed-Removable partial dentures: Restorations have a fixed part attached to abutments and a removable part for the patient.
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Description
This quiz covers the fundamentals of dental prosthetics, including the definition and purpose of different types of crowns. Explore the classifications of crowns based on material and coverage, and understand their roles in restoring tooth anatomy and function.
