DefinitionDefinition
A removable partial or complete denture that covers and rests on one or more remaining natural teeth, the roots of natural teeth or dental implants. It is partially supported by natural teeth or dental implants.
Types of OverdenturesTypes of Overdentures
Tooth supported overdenture. Implant supported overdenture.
Rationale for OverdenturesRationale for Overdentures
Bone Preservation.– Edentulous mouth Bone loss of 6.6mm in 7
years.– Dentate mouth Bone loss of 0.8mm in 7 years. – Mandibular bone is affected four times more
than the maxillary bone.Tallgreen A
Acta Odontol Scand 24: 195-239, 1966.
Advantages of OverdenturesAdvantages of Overdentures
Stability.– Bone preservation
Retention.– Primary retentive areas are preserved
Advantages of OverdenturesAdvantages of Overdentures
Attachments
– A typical mandibular denture moves about 10mm during function.
Misch C.
Implant Dentistry 2nd Ed. Mosby
Pg: 177.
Indications for OverdenturesIndications for Overdentures
Few remaining teeth are present. Poor prognosis for complete dentures.
Contraindications for Contraindications for OverdenturesOverdentures
If any other prosthetic plan can give superior results
Treatment PlanningTreatment Planning
Patient Selection– Medical History.– Oral Hygiene.– Compliance. – Motivation.
Treatment PlanningTreatment Planning
Abutment selection.– Position.– Number of abutments– Periodontal evaluation.– Endodontic evaluation.– Decay or previous restorations.
Inter-arch space.
Inter-arch SpaceInter-arch SpaceThe determination of a case to be treated with overdentures should be done with care, mounted models are extremely beneficial in determining whether there is adequate space for the overdenture, attachments or copings.
Denture-abutment InterfaceDenture-abutment Interface
Indirect– Abutments prepared
prior to impression
Direct– Abutments prepared at
delivery (c.f. Immediate denture)
Tooth Supported Conical Crown TelescopicTooth Supported Conical Crown TelescopicOverdenturesOverdentures
Overdenture RisksOverdenture Risks
Abutment– Caries– Wear
Periodontium– Gingivitis– Periodontitis– Hyperplasia