Overdentures Flashcards
What is a complete overdenture?
It is a complete or partial denture that covers and rests on one or more remaining natural teeth, roots of natural teeth, and/or dental implants.
How are complete overdentures classified?
They are classified into tooth-supported complete overdentures and implant-supported complete overdentures.
What are the types of tooth-supported overdentures?
Tooth-supported overdenture, tooth-tissue-supported overdenture, and tissue-supported overdenture.
What is the main advantage of a complete overdenture in terms of alveolar bone?
It helps preserve the alveolar bone, which begins to resorb when teeth are removed.
How does a complete overdenture preserve proprioceptive response?
It preserves the periodontal membrane surrounding the retained teeth, maintaining proprioception and improving the patient’s masticatory function.
How does a complete overdenture offer better support compared to conventional dentures?
The retained teeth provide extra support for the overdenture, unlike fully edentulous cases.
How does retention improve with a complete overdenture?
Retention improves through attachment devices or lining with resilient denture liners, and the shape of abutments can increase retention.
Why is a complete overdenture a simple approach for problem patients?
It offers a less complex, faster, and cost-effective solution for patients with congenital defects or extensive restorative needs.
Why is patient acceptance high for complete overdentures?
Patients appreciate improved function and esthetics while retaining some of their natural teeth.
How does convertibility benefit complete overdentures?
If overlaid teeth must be extracted, the overdenture can be easily converted to a full denture.
What is a common disadvantage of complete overdentures related to caries?
The retained teeth are prone to caries, making home care and regular recalls essential.
How do bony undercuts affect complete overdenture fit?
Bony undercuts limit the path of insertion, requiring modifications like blocking or shortening the flange, which may affect the seal.
What happens when interocclusal distance is encroached in overdentures?
Encroachment, especially with internal attachments, can compromise space and affect esthetics.
How does a complete overdenture impact esthetics in some cases?
Issues like foreshortened flanges or bulky dentures due to insufficient space can affect the appearance.
What risk does a complete overdenture pose to periodontal health?
It can promote plaque accumulation and gingival irritation, leading to periodontal breakdown of abutment teeth.
When is a complete overdenture indicated?
It is indicated in cases with few remaining teeth unsuitable for fixed or removable partial dentures.
Why is a complete overdenture suitable for patients with mobile teeth?
Reducing the coronal portion drastically reduces mobility, making them good abutments.
How is a complete overdenture useful for patients with congenital defects?
It provides an effective treatment option for conditions like cleft palate, amelogenesis imperfecta, and partial anodontia.
Why is a complete overdenture recommended for younger patients?
It preserves teeth and supporting bone, which is important for long-term oral health in younger individuals.
Why are cases with torus palatines or mandibularies indicated for overdentures?
Overdentures can overcome issues with denture extension and retention caused by these bony protrusions.
When is a complete overdenture contraindicated?
It is contraindicated in cases with poor oral hygiene, inadequate interarch space, abutments with mobility exceeding grade II, or decreased patient motivation.
Why is periodontal condition critical for abutment teeth in overdentures?
Abutments must have optimum periodontal health to ensure longevity and success of the overdenture.
How does abutment distribution affect the prognosis of overdentures?
More abutments improve prognosis, with two per quadrant or a tripod distribution being ideal.
What is a simple tooth modification technique for overdentures?
Teeth are reshaped to eliminate undercuts, often used in patients with severe abrasion.
When are cast copings recommended for overdentures?
Cast copings are used when there is sensitivity or as a caries control method.
What is the purpose of telescopic overdentures?
They provide retention through frictional resistance between semi-parallel walls of copings and the denture base.
How is amalgam used in endodontically treated teeth for overdentures?
Teeth are drastically reduced to gingival level and filled with an amalgam plug for space without increasing vertical dimension.
What is the role of cast dowel copings in overdentures?
Cast dowel copings provide retention through a short post placed within the root canal, securing the overdenture.
What is the purpose of attachments in overdentures?
Attachments provide retention and stabilization of the prosthesis, with types including rigid and resilient attachments.
How do stud attachments work in overdentures?
A male stud is soldered to the prepared tooth and fits into a female housing embedded in the denture or substructure.
What are the purposes of bar attachments in overdentures?
Bar attachments splint abutments and provide retention and support for non-parallel abutments.
What is the advantage of bar joints over bar units?
Bar joints permit rotational movement, using more of the residual ridge for support, unlike rigid bar units.
How are magnets used in overdentures?
Magnets are placed in the denture base, opposite to keepers cemented in abutments, providing retention with minimal lateral force transmission.
What are mini implants, and when are they indicated?
Mini implants are small-diameter implants used in cases with minimal remaining bone, for extra retention in edentulous arches or under partial dentures.
What are the advantages of mini implants in overdenture treatment?
Mini implants reduce bleeding, shorten healing time, allow placement in narrow ridges, and enable immediate loading.
