Fixed Pros - Revision Lecture Flashcards
What is the definition of a dental crown
- A rigid restoration that covers parts or the whole of the external aspects of the tooth
What are dental crowns usually constructed from
- Gold
- Ceramics
- Composite resin
- Or a combo
What are some indications of a crown restoration
- To protect the remaining tooth structure
- Aesthetic demands
- Abutments for fixed/removable partial dentures
- To alter the occlusal plane
Name some types of crown restoration
- Full Gold Crown
- Partial Gold Crown
- Ceramo-Metal Crowns
- All ceramic crowns
- Composite crowns
What are some principles to keep in mind when doing tooth prep for a crown
- Preserve the tooth structures
- Retention and resistance
- Structural durability
- Marginal integrity
- Preservation of the periodontium
How close should the marginal finishing line be from the alveolar crest
not within 2mm
What is retention
Retention prevent the removal of the restoration along the path of insertion or long axis of the tooth preparation
What is resistance
Resistance prevents dislodgement of the restoration by forces directed in an apical or oblique direction and prevents any movement of the restoration under occlusal forces
AY BAWS CAN I HABE DE NOTE PLZ
Remember the taper you need after tooth prep for a crown
What is the definition of a taper in crown tooth preps
Taper is the angle between one axial wall of the preparation and the long axis of the preparation
What is the convergence angle in crown tooth preps
Convergence angle is the angle between 2 opposing axial walls of a preparation and equals the sum of the taper of 2 opposing axial walls.
When do we not need a bite registration
- When we have a bounded preparation with a stable occlusion
When do we need to have a bite registration
- When prepping the last tooth in the arch
- With multiple preparations
- With multiple anterior preparations
What is a basic description of the ICP
- This is the position where there is the most tooth to tooth contact
Why do we record the ICP
As we conform to the patient’s occlusion to ensure the restoration harmonises with the existing occlusal scheme and doesnt make occlusal interferences