2 DefinitionA 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.
3 Types of Overdentures Tooth supported overdenture. Implant supported overdenture.
4 Rationale 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 AActa Odontol Scand 24: , 1966.
5 Advantages of Overdentures Stability.Bone preservationRetention.Primary retentive areas are preserved
6 Advantages of Overdentures AttachmentsA typical mandibular denture moves about 10mm during function.Misch C.Implant Dentistry 2nd Ed. MosbyPg: 177.
9 Disadvantages of Overdentures ExpenseBulkierRemovable Prosthesis
10 Indications for Overdentures Few remaining teeth are present.Poor prognosis for complete dentures.
11 Contraindications for Overdentures If any other prosthetic plan can give superior results
12 Treatment Planning Patient Selection Medical History. Oral Hygiene. Compliance.Motivation.
13 Treatment Planning Abutment selection. Inter-arch space. Position. Number of abutmentsPeriodontal evaluation.Endodontic evaluation.Decay or previous restorations.Inter-arch space.
14 Inter-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.
15 Options Put a coping on it Leave it as is Fill with a restorative material