Overdenture Abutments Flashcards
1
Q
Define over dentures
A
A prosthesis that derives support from one or more abutment teeth (implant) by completely enclosing them beneath its impression session
2
Q
How much resorption occurs of residual alveolar ridges following extraction
A
0.25-0.4mm annual bone loss following extraction
3
Q
Which area of the mouth Is most affected by resorption of residual alveolar ridges following extraction
A
Anterior mandible
4
Q
What are the advantages of over dentures
A
- Less resorption of alveolar bone
- Improved sensory feedback
- Improved rertention
- Decreased psychological trauma
5
Q
What are some of the disadvantages of overdentues
A
- Expensive
- More complicated maintenance
- Weakening of denture base
- Excellent OH requirement
- Potential for caries and periodontal disease
6
Q
Give some indications for over dentures
A
- Suitable teeth present
- Complete of partial denture required
- Sufficient inter occlusal space
- Cleft palate/ surgical defect where additional tooth borne support would be beneficial
- Severe toothwear with healthy perio dontium
7
Q
Give some contra indications for over dentures
A
- High caries risk and patient not modifying behaviour
- Subgingival caries on abutment teeth
- Active periodontal disease and poor bone support
- Poor OH or patient not able to maintain high level of plaque control
- Any condition which precludes root canal treatment
8
Q
What criteria must an abutment tooth fulfil to qualify for an over denture
A
- Need 6mm bone support+ good width of attached gingiva
- No sub gingival caries
- RCT possible to complete
- Teeth symmetrically distributed in the arch
- At least 2 abutments required
- Cleansable
9
Q
Which teeth are the best over denture abutments
A
- Canines
- Premolars
- Molars
- Incisors
10
Q
How can we modify a tooth for an over denture
A
- Simple dome following RCT and composite over GP
- Onlay/ coping
- Vital thimble crown
- Root face attachment
- Bars
- Magnets
