Brief over view of overdentures

1. BY
TEDDIE
MATUNDURA
6th Oct 2014

2. DEFINATION
 A removable partial denture or complete denture that
covers and rests on one or more of the remaining
natural teeth and/or dental implants.
 It is also known as overlay denture, hybrid
prosthesis, telescoping denture or tooth supported
denture.

3. RATIONALE
 Remaining roots offer the best available support for
occlusal force.
 Accelerated rate of bone resorption is prevented.
 It increases the patient’s manipulative skills in
handling the denture. As the patient’s proprioception
is maintained.

4. INDICATIONS
 Periodontal disease
 Few natural remaining teeth
 Insufficient crown/root ratios
 Severe attrition and loss of vertical dimension
 Congenital or acquired intraoral defects e.g. cleft
palate, hypodontia
 Mandibular arch where resorption rate is faster
 Edentulous maxilla opposing dentate mandible
 Post traumatic/post surgical cases

5. SELECTION OF
ABUTEMENT TEETH
The following factors need to be put into consideration;
1. Periodontal status.
2. Abutement location.
 One per quadrant
 No adjacent teeth
3.Endodontic and prosthetic status.
 Usually mandibular cuspids and premolars

6. PREPARATORY TREATMENT
1. Construct an immediate treatment . For
esthetics and to retain jaw relations.
2. Remove hopeless teeth and insert the
removable prosthesis.
3. During the healing period, institute the
periodontal and endodontic treatment.

7. TOOTH PREPARATION
 Remove sufficient tooth structure to provide
favorable root crown ratio.
 Reduce the crown length up to 2 mm above the
gingival crest or extend a chamfer type margin
slightly beneath free gingival margin.
 Taper the preparation occlusogingivally.

8. PLACEMENT
 Overdentures can be placed either directly or
indirectly. The procedures are as follows;
I. Direct placement
 Male or female premanufactured attachment is
cemented into root
 Denture is made and inserted
 Corresponding male or female attachment is
inserted in root
 Attachment is picked up directly in the overdenture
with cold cure acrylic

9. PLACEMENT
II. Indirect Placement
 Male or female attachment is cemented into root or
may need to be cast onto coping
 Corresponding male or female transfer analog is
inserted into root attachment
 Transfer impression is taken and models are poured
with transfer in place
 Laboratory processes denture with corresponding
attachment in place

10. QUERIES???