Restorative tutorial Flashcards
Why do we use GI luting cement?
- Cheap
- Fluoride release
- Self adhesive to the tooth
How does GI set?
Self-cured
When would you use a GI cement?
- Metal ceramic crowns and bridges
- Metal posts
How does RMGIC compare to GIC ?
- RMGIC has a shorter setting time
- RMGIC has a longer working time
- RMGIC has a higher compressive and tensile strength
- RMGIC has decreased solubility
- RMGIC has a better bond strength to tooth
How does it set RMGIC set?
Self cure or dual cure
When would you use RMGIC?
MCC
metal posts
Describe the properties of composite luting cements
- technique sensitive
- need good moisture control
- need to be used with a dentine bonding agent
What would you use with a composite luting cement when cementing a ceramic restoration?
Silane coupling agent
With what do etch a porcelain?
Hydrofluoric Acid
What does composite luting cement need to be cement to cement non precious metal ?
MDP or 4-Meta + need to sandblast metal surface
Describe the different curing systems for composite luting cements?
- Self-cured
- Light-cured
- Dual-cured
When would you use a dual cure composite luting cement?
- Ceramic crowns and onlays
- Composite Onlays
- Fibre posts
When would you use a light cured composite resin luting cement?
- Veneers as it sets on demand and allow for longer working time
- good for cementing multiple units
When would you use a self-adhesive composite resin?
In resin retained bridges
What do we mean by anaerobic self cure ?
- Only sets when oxygen is not in contact with the cement
- It starts setting when there is close contact between two surfaced
- Contains MDP
When would you use a self-etching composite resin cement?
Fibre posts
ceramic ,composite and porcelain indirect restorations
When do you place a post?
When there is not enough coronal tooth structure to support a core in order to retain the crown ( in an endodontically treated tooth)
Why is placing a post in posterior teeth not advised?
- Posts work better in straight canals , posteriors have curved ones which can lead to perforations
What would you place in posterior teeth instead of a post?
- Nayyar core which is an amalgam core
- Onlay
What is the ideal dimensions of post length?
- It needs to extend beyond the level of the alveolar bone
- At least 1:1 height ratio to crown
- 3-5mm of GP must be in the canal apically
What are the ideal dimensions of post width?
- Less than 1/3d of the diameter of the root
ferrule ideal dimensions?
1-1.5mm circumferential dentine
3 post materials?
- Metal - gold , SS , brass and titanium
- Ceramics - alumina and zirconia
- Fibre - glass, quartz and carbon
4 disadvantages of metal posts?
- Poor aesthetics
- root fracture
- corrosion
- nickel sensitivity
