OverdenturesOverdentures

DR.FARIBORZ SAADAT

DMD.PHD.

PROSTHODONTIST

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.

ATTACHMENTSATTACHMENTS

Advantages of OverdenturesAdvantages of Overdentures

Chewing Ability

Disadvantages of Disadvantages of OverdenturesOverdentures

Expense

Bulkier

Removable Prosthesis

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.

OptionsOptionsLeave it as is

Fill with a restorative material

Put a coping on it

OptionsOptions

OptionsOptions

Denture-abutment InterfaceDenture-abutment Interface

Indirect– Abutments prepared

prior to impression

Direct– Abutments prepared at

delivery (c.f. Immediate denture)

Denture Abutment Interface Denture Abutment Interface DirectDirect

Denture Abutment Interface Denture Abutment Interface DirectDirect

Denture Abutment Interface Denture Abutment Interface Indirect PreparationIndirect Preparation

Impression

Pick upPick up

Transfer & analogTransfer & analog

Mounting transfer pin&analogMounting transfer pin&analog

DeliveryDelivery

Denture Abutment Interface Denture Abutment Interface

Indirect

Impression

pick up impression

Ball post attachments

Impression for overdenturImpression for overdentur

BALL POST RETAINEDBALL POST RETAINED OVERDENTURE

Tooth Supported Conical Crown TelescopicTooth Supported Conical Crown TelescopicOverdenturesOverdentures

Overdenture RisksOverdenture Risks

Abutment– Caries– Wear

Periodontium– Gingivitis– Periodontitis– Hyperplasia

MaintenanceMaintenance

Oral HygieneFrequent recalls