over complete denture

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Complete Denture
Level 3
Dental Technician
‫د‬
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‫الغفاري‬ ‫خالد‬

2. Overdenture

3. Definition
An overdenture is a removable dental prosthesis that covers and rests on one or more
remaining natural teeth, the roots of natural teeth, and/or dental implants.
Overdenture

4. • Overdenture aimed to maintain and preserve the residual ridge.
This is particularly advantageous in the mandibular arch, where edentulous ridges
may resorb at a rate four times greater than that of the maxillary arch.
Aim of Overdenture

5. Advantage:
• Greatly Enhanced Stability
Anteroposterior and lateral slipping and sliding are eliminated.
• Preservation of proprioceptive response :
Enhance neuromuscular control and biting force.
• Prevent of natural abutment teeth from loss.
• Preservation of residual ridge:
• Increase support:
Presence of natural teeth lead to less trauma to soft tissue.
• Retention:
Through different attachment devices.

6. Advantage:
• Convertibility:
• Patient acceptance and psychological benefits:

7. Increased bulk
Disadvantage:
• Increased bulk:
• More expensive than conventional dentures and time consuming:
because of periodontal and endodontic therapy followed by restoration of abutment with coping.
• Encroachment of interocclusal distance.
• Progression of caries and periodontal disease:
if oral hygiene is not maintained.
• Bony undercuts.
Limitation of the path of insertion of the overdenture.

8. Disadvantage:
• Increased vertical dimension if abutment teeth not reduced adequately :
• Periodontal breakdown of the abutment teeth:
• Gingivitis.
• Periodontitis.
• Hyperplasia.

9. Disadvantage:

10. Indication:
• Mobile teeth up to grade II:
Decreasing the crown/root ratio will decrease the hypermobility of teeth.
• Patients with widely distributed retained teeth.
Not suitable for removable or fixed partial denture.
• Congenital defects:
In cleft palate patients, the support and retention are gained from remaining natural teeth
• Patients with poor prognosis for complete dentures:
which may involve poorly defined sublingual fold space, knife edge ridge that will provide
inadequate retention and support.
• Patients who are mentally and physically prepared and accept the responsibility of
maintaining good oral hygiene.

11. Indication:

12. Increased bulk
contraindication:
• Patients with poor oral hygiene.
• If any prosthetic plan can give superior results.
• Inadequate interarch distance to accept the denture and abutment.
• Tooth mobility greater than grade III.

13. Types of Overdenture:
1- according to type of support:
• Non coping
• Coping:
• Long coping.
• Short coping.
• Attachment devices.
• Attachment with telescopic crowns.
• Implant retained and tissue born
overdenture
• Implant retained and implant
supported overdenture.
Tooth supported overdenture Implant supported over denture:

14. Tooth supported overdenture:
Abutment tooth preparation:
Endodontic ttt and amalgam plug.
• Non coping:

15. Tooth supported overdenture:
Abutment tooth preparation:
Endodontic ttt and and cast copnig.
1. Long coping.
2. Short coping.
• coping:

16. Tooth supported overdenture:
Abutment tooth preparation:
Endodontic ttt and incorporating of the
attachment.
• Attachment devices:

17. Tooth supported overdenture:
Abutment tooth preparation:
Made up of primary coping over the
abutment teeth, and secondary coping
in the denture.
• Attachment with telescopic crowns:

18. Types of Overdenture:
2- according to timing:
• Fabrication of the
denture prior to the
tooth reduction on the
patient mouth.
• During denture
fabrication, the teeth are
reduced in the cast.
• Converting an already
removable to
overdenture.
Immediate overdenture:
Intermediate or transitional
overdenture
• Abutment teeth
preparation.
• Then fabrication of the
definitive conventional
overdenture.
Defenitive overdetutre

19. Types of Overdenture:
2- according to timing:
Immediate overdenture:

20. Types of Overdenture:
2- according to timing:
Intermediate or transitional overdenture

21. Impression of the abutment teeth:
A full coverage impression is
made conventionally after
the abutment is prepared.
One stage technique without
retentive element or coping:

22. Impression of the abutment teeth:
The retentive element is first
set in place, then the
impression will pick up the
retentive element upon
removal from the patient
mouth.
One stage technique with
retentive element or coping:

23. End