Indirect Restorations and Provisional restorations Flashcards
Indications for placing veneers? (5)
Improve aesthetics
Change teeth shape and/ or contour
Correct peg laterals
Reduce or close proximal spaces and diastemas
Align labial surfaces of in-standing teeth
When should you NOT use veneers? (10)
Poor OH
High caries rate
Gingival recession
Root exposure
High lip lines
If extensive prep needed (>50% SA no longer in enamel)
Severely rotated or overlapping teeth
Insufficient bonding area
Heavy occlusal contacts
Severe discolouration
Why restore teeth with crowns? (5)
To protect weakened tooth structure
To improve/ restore aesthetics
For use as retainer for fixed bridgework
When indicated by RPD design
To restore tooth function
Why NOT restore with crowns? (5)
Active caries and perio disease
More conservation options available
Lack of tooth tissue for prep
Unfavourable occlusion
What does under preparation in crown prep result in?
Poor aesthetics
Over built crown with perio and occlusal consequences
Restorations with insufficient thickness
What does OVER preparation in crown prep result in?
Pulp and tooth strength being compromised
What is resistance in crowns?
Prevents dislodgment of the restoration by forces directed in an apical or oblique direction and prevents any movement of the restoration under occlusal forces
How is retention of a crown improved?
By limiting the number of paths of insertion
What is the ideal taper for a crown?
6-10 degrees
What are the 6 principles of crown prep?
Preservation of tooth structure
Retention and resistance
Structural durability
Marginal integrity
Preservation of periodontium
Aesthetic considerations
How is structural durability for crowns achieved?
Occlusal reduction
Functional cusp bevel
Axial reduction
Do you want longer or shorter walls in a crown?
Longer walls prevent tipping displacement
Indications for an inlay?
Premolars or molars
Occlusal restorations
MO or DO restoration
MOD - only if kept narrow - if not consider onlay
Low caries rate
What are the advantages and disadvantages of inlays vs direct restorations?
Advantages
- Superior materials and margins
- Won’t deteriorate over time
Disadvantages
- Time
- Cost
What are the conventional clinical stages of indirect restorations?
Preparation
Temporisation
Impressions and occlusal records
Cementation
