DR.FARIBORZ SAADAT DMD.PHD. PROSTHODONTIST Overdentures DR.FARIBORZ SAADAT DMD.PHD. PROSTHODONTIST

Definition 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 Overdentures Tooth supported overdenture. Implant supported overdenture.

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 A Acta Odontol Scand 24: 195-239, 1966.

Advantages of Overdentures Stability. Bone preservation Retention. Primary retentive areas are preserved

Advantages of Overdentures Attachments A typical mandibular denture moves about 10mm during function. Misch C. Implant Dentistry 2nd Ed. Mosby Pg: 177.

ATTACHMENTS

Advantages of Overdentures Chewing Ability

Disadvantages of Overdentures Expense Bulkier Removable Prosthesis

Indications for Overdentures Few remaining teeth are present. Poor prognosis for complete dentures.

Contraindications for Overdentures If any other prosthetic plan can give superior results

Treatment Planning Patient Selection Medical History. Oral Hygiene. Compliance. Motivation.

Treatment Planning Abutment selection. Inter-arch space. Position. Number of abutments Periodontal evaluation. Endodontic evaluation. Decay or previous restorations. Inter-arch space.

Inter-arch Space The 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.

Options Put a coping on it Leave it as is Fill with a restorative material

Options

Options

Denture-abutment Interface Indirect Abutments prepared prior to impression Direct Abutments prepared at delivery (c.f. Immediate denture)

Denture Abutment Interface Direct

Denture Abutment Interface Direct

Denture Abutment Interface Indirect Preparation

Impression

Pick up

Transfer & analog

Mounting transfer pin&analog

Delivery

Denture Abutment Interface Indirect

Impression

pick up impression

Ball post attachments

Impression for overdentur

BALL POST RETAINED OVERDENTURE

Tooth Supported Conical Crown Telescopic Overdentures

Overdenture Risks Abutment Periodontium Caries Wear Gingivitis Periodontitis Hyperplasia

Maintenance Oral Hygiene Frequent recalls

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