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Over denture
This document provides an overview of over dentures, including: - Definitions of over dentures and the advantages of using them to preserve remaining teeth and bone. - Classifications of over dentures based on the type of support (tooth, implant, or mixed) and the timing of placement. - Common attachment types used for retention, including studs, bars, and magnets attached to teeth or implants. - The minimum number of implants needed for fully implant supported maxillary and mandibular over dentures.
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Over denture
- 1. This is justthe start.
- 2. OVER DENTURE Supervised By Prof.Dr: Ahmed M.Alshimy Presented By Ahmed Anwar Elmessiny Student No : 01
- 3. CONTENTS Introduction Definitions Advantages Of AConventional Over-Denture Disadvantages Of A Conventional Over-Denture Abutments for tooth supported Over-dentures Types Of Over-Dentures Tooth supported over-dentures Implant supported over- denture Implant – tooth supported over denture
- 4. CONTENTS Based On TypeOf Over Denture Immediate over denture Interim over denture Remote or Definitive over denture Based On Type Of Over Denture Attachments
- 5. INTRODUCTION Extraction of teethfollowed by continuous ridge resorption and poor denture foundation Loss of periodontal receptors responsible for proper masticatory function and accurate jaw movements Retention of few remaining teeth to support denture will preserve alveolar bone & preserve periodontal receptors
- 6. DEFINITION Over denture, Anremovable partial denture or complete denture that covers & rests on one or more remaining natural teeth, the roots of natural teeth, and /or dental implants
- 7. ADVANTAGES OF OVERDENTURE Helps reduce shrinkage of surrounding bone Reduces pressure to portions of the alveolar ridge Positive psychological advantage of still having teeth Support – Stability- Retention Preservation of alveolar hone Feels more like having teeth More retentive in many cases Patient acceptance………….
- 8. DISADVANTAGES OF OVERDENTURE May cause attrition of teeth Meticulous oral hygiene is required Bony undercuts Require special material & attach material More bulky than fixed or removable partial dentures Periodontal breakdown of the abutment teeth Caries susceptibility More expensive.
- 9. CLASSIFICATION OF OVERDENTURES OVERDENTURE TOOTHSUPPORTED IMPLANT SUPPORTED Non Coping Coping Attachments Tissue Implant supported Fully Implant supportedShort Long Stud Magnets Bar
- 10. ABUTMENTS FOR TOOTHSUPPORTED OVERDENTURES 1.Abutment With Telescopic Crowns 2.Dome Shaped Abutments With Cast Coping 3 - Abutments With Slight Tooth Reduction & Cast
- 11. ABUTMENTS FOR TOOTHSUPPORTED OVERDENTURES 4 - Abutments With An Added Form Of Attachment 5 - Dome Shaped Abutment With Amalgam Plug 6 -.Submerged Roots
- 12. ABUTMENTS SUPPORTED OVERDENTURES AccordingTo Time Of Placement It is an overdenture that constructed for insertion immediately after the removal of natural teeth. It is constructed for patient with a full complement of natural teeth most of which are to be lost. The teeth chosen as abutments are reduced on the cast and the over denture constructed and placed on the day of extraction IMMEDIATE OVER DENTURE
- 13. ABUTMENTS SUPPORTED OVERDENTURES AccordingTo Time Of Placement transition or preparation phase until permanent over denture constructed Patient old partial denture can be modified & used by extending the denture and add new artificial teeth using self-cure acrylic resin INTERIM OVER DENTURE
- 14. ABUTMENTS SUPPORTED OVERDENTURES AccordingTo Time Of Placement A remote overdenture is an overdenture constructed for insertion at some time "remote" from the removal of hopeless teeth. It is placed over well-healed residual ridges, usually after a period of satisfactory experience with an interim overdenture, which can be immediate or transitional overdenture. Remote overdentures can be constructed entirely of resin; metal bases are frequently used to increase rigidity and strength REMOTE OR DEFINITIVE OVER DENTURE
- 15. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES Selected tooth abutments are reduced to a coronal height of 2 to 3 mm. and then contoured to a convex or dome shaped surface. Most teeth required endodontic therapy and in final step are prepared conservatively to receive an amalgam or composite type restoration A - NON COPING ABUTMENTS
- 16. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES • Cast metal coping with a dome shaped surface and a chamber finishline at the gingival margin are fabricated and cemented B - ABUTMENTS WITH COPINGS 1.Short Cast Copings 2 . Long Cast Coping TYPES
- 17. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES Attachments are small precision devices.Objective is to improve retention of denture base Most attachments are secured to abutment by a cast coping.. Consists of two parts Male Female C – ABUTMENT WITH ATTACHMENTS
- 18. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES Doesn’t allow movement of denture base Provide adequate retention May induce more torque on abutment Allows some control of movements. Induces less torque on abutments. C – ABUTMENT WITH ATTACHMENTS Rigid attachment Resilient attachment A B TYPES OF ATTACHMENTS
- 19. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES Consists of 2 parts usually attached to metal coping cemented over prepared abutment embedded in the fitting surface of overdenture OVER-DENTURE ATTACHMENT 1 Stud attachment The Stud Housing
- 20. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES The stud is attached to the metal coping cemented over the prepared abutment, while the housing is embedded in the fitting surface of the denture OVER-DENTURE ATTACHMENT 1 Stud attachment Extra-radicularA
- 21. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES The stud is attached to the fitting surface of the denture and the housing is incorporated in the abutment. OVER-DENTURE ATTACHMENT 1 Stud attachment Intra-RadicularB
- 22. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES A bar contoured to connect abutment teeth together , run parallel & overlie residual ridge Provide support & retention for overdenture & splint abutment teeth Bars may be in form of preformed metal or plastic OVER-DENTURE ATTACHMENT 2 Bar attachment
- 23. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES Rigidly fixed to copings, don’t allow any movement between bar & sleeve Transmits occlusal stresses totally to abutments “tooth born Resilient attachments allowing movement between bar & sleeve Support provided by both residual ridge & abutment teeth “tooth tissue born OVER-DENTURE ATTACHMENT 2 Bar attachment Bar units Bar joint
- 24. CLASSIFICATION OF OVERDENTURES ABUTMENTSUPPORTED OVERDENTURES Small, strong mini magnets One of poles cemented in a prepared cavity in endodontically treated abutment &the other attached to denture base OVER-DENTURE ATTACHMENT 3 Magnetic attachment
- 25. CLASSIFICATION OF OVERDENTURES 2-IMPLANTSUPPORTED OVERDENTURES A removable implant overdenture is a prosthesis which is removable by the patient and is supported or retained by dental implants The prosthesis has to be removed for the purpose of cleaning around the abutments
- 26. CLASSIFICATION OF OVERDENTURES 2-IMPLANTSUPPORTED OVERDENTURES In the mandible a minimum of 2 implants In the maxilla a minimum of 4 implants are indicated for this type of an overdentur The attachments give retention to the prosthesis. In eating, the ridge receives masticatory forces The tissue supported implant overdenture is useful in cases where the presenting problem is that of denture movement TYPES OF IMPLANT OVERDENTURES Tissue implant supported1
- 27. CLASSIFICATION OF OVERDENTURES 2-IMPLANTSUPPORTED OVERDENTURES In the mandible a minimum of 4 implants In the maxilla a minimum of 4/6 implants During mastication, the attachment assembly transfers all the masticatory forces to the supporting implants This type of implant overdenture is particularly appropriate for patients who present with considerable functional difficulty and pain while functioning on their dentures. TYPES OF IMPLANT OVERDENTURES Fully implant supported2
- 29. ATTACHMENTS FEMALE PORTION Prosthesis MALEPORTION Implants BALL ATTACHMENTS O-ring Syste Locator System BAR & CLIP ATTACHMENTS CM Bar & Rider/Ackermann Clips Dolder Bar System Hader Bar System/EDS System
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