Principles for Design Outline form Flashcards
5 factors determining outline form?
- Conservation of tooth structure
- Caries
- Undermined enamel
- Decalcified enamel
- Extension for restorability
What measurement of the oblique ridge should we connect two preparations together?
Less than 1.0 mm
What 4 things do we focus on to conserve tooth structure
- Marginal ridges - outline is parallel to marginal ridge outline
- Triangular ridges - Buttresses that give tooth strength
- Isthmus - Keep isthmus small we minimize removing triangular ridge
- Oblique ridge - Outline is parallel to oblique ridge
What is the biggest factor in determining the outline design?
Caries
Which way do caries spread once they get past the DEJ?
Laterally
T or F, Make sure to look under the enamel along the DEJ to make sure all caries is removed
True
Do you need to include decalcified enamel in your outline form?
Yes, but might want to try chemotherapy first to remineralize tooth before the the preparation is done.
Purpose of extension for restorability
Ability to carve and polish away excess restorative material
Modifying factors of outline form
- Type of restorative material used
- Esthetic requirements
- The patient
- Occlusion
- Tooth position and size
Amalgam extensions allow for how much of separation?
0.5 - 1.0 mm
Difference between amalgam and inlay preparation
Walls converge –> Amalgam
Walls diverge –> Inlay
How are facial and lingual extensions different in gold inlay
Wider extensions
Are you more aggressive or less aggressive on removing decalcification if a patient is noncompliant
More aggressive