RBB Flashcards
Where do we need RBB?
For long standing gaps
When do we need RBB?
- Hypodontia pt’s
- Restore function (speak, chew)
- Unwanted tooth movements ( overeruption, drifting)
Why do we use RBB?
- Minimally invasive
- Rely on composite resin cements for retention (bonded chemically to both the tooth surface and metal alloy)
Pros of RBB?
- Minimally invasive, no LA needed
- High predictable success rate
- Soft tissues are not disturbed
- Relatively reversible
- Less demanding to fit than other forms of tooth replacement
- Less clinical time
- Cheaper
- Aesthetic
- Failure is less catastrophic
Cons of RBB?
- Debonding
- Longevity
- Aesthetics (metal wing)
What factors should be considered during case selection for RBB?
- OH (RBB may be preferable in pt with no history of periodontal disease or caries)
- Age (older pt may accept short dental arch, temporary option for younger pt’s)
- Pt expectations (manage aesthetics &longevity expectations)
what factors should be taken into consideration when placing RBB?
- Identify who is suitable
- Think about medical history
- Check perio and pulpal status
- Check abutment teeth
- Check if pt has good dexterity to maintain OH
- Check pt expectations
- Explain pros, cons and maintenance to patient
What type pontic do we use for immediate RBB? and what are its disadvantages?
OVATE pontic
- post extraction it forms a dimple and since it engages the tissue it is aesthetically pleasing.
- Not a good long term solution due inflammation build up underneath the pontic which is undesirable
What is the ideal pontic for patients and why?
Porselin infused to metal modified ridge lap
- The buccal aspect of the pontic would engage apically to the tissue
- It is ideal since can clean with interdentalbrushes and superfloss
what material is a pontic made out of?
Well polishes porcelain ceramic over the metal substructure
what are the components of bridge work?
- Abutment
- retainer (wing)
- Pontic (teeth)
- connector (holds the pontic and wing together)
what is the ideal thickness and height of a retainer?
0.7 mm thickness
3 mm height (not aesthetically pleasing might see metal)
why and how should the retainer be surface treated?
to enhance micromechanical retention
- done using sandblast with 50 micron alumina
why is a single wing better and which aspect should it be placed?
- it is better due to caries risk
- wing should be placed on the distal aspect
what material is the retainer made of?
non precious metal substrate
- nickel chronium alloy or
- cobalt chronium alloy
