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Removable > Overdentures > Flashcards

Overdentures Flashcards

1
Q

What is a complete overdenture?

A

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.

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2
Q

How are complete overdentures classified?

A

They are classified into tooth-supported complete overdentures and implant-supported complete overdentures.

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3
Q

What are the types of tooth-supported overdentures?

A

Tooth-supported overdenture, tooth-tissue-supported overdenture, and tissue-supported overdenture.

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4
Q

What is the main advantage of a complete overdenture in terms of alveolar bone?

A

It helps preserve the alveolar bone, which begins to resorb when teeth are removed.

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5
Q

How does a complete overdenture preserve proprioceptive response?

A

It preserves the periodontal membrane surrounding the retained teeth, maintaining proprioception and improving the patient’s masticatory function.

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6
Q

How does a complete overdenture offer better support compared to conventional dentures?

A

The retained teeth provide extra support for the overdenture, unlike fully edentulous cases.

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7
Q

How does retention improve with a complete overdenture?

A

Retention improves through attachment devices or lining with resilient denture liners, and the shape of abutments can increase retention.

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8
Q

Why is a complete overdenture a simple approach for problem patients?

A

It offers a less complex, faster, and cost-effective solution for patients with congenital defects or extensive restorative needs.

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9
Q

Why is patient acceptance high for complete overdentures?

A

Patients appreciate improved function and esthetics while retaining some of their natural teeth.

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10
Q

How does convertibility benefit complete overdentures?

A

If overlaid teeth must be extracted, the overdenture can be easily converted to a full denture.

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11
Q

What is a common disadvantage of complete overdentures related to caries?

A

The retained teeth are prone to caries, making home care and regular recalls essential.

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12
Q

How do bony undercuts affect complete overdenture fit?

A

Bony undercuts limit the path of insertion, requiring modifications like blocking or shortening the flange, which may affect the seal.

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13
Q

What happens when interocclusal distance is encroached in overdentures?

A

Encroachment, especially with internal attachments, can compromise space and affect esthetics.

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14
Q

How does a complete overdenture impact esthetics in some cases?

A

Issues like foreshortened flanges or bulky dentures due to insufficient space can affect the appearance.

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15
Q

What risk does a complete overdenture pose to periodontal health?

A

It can promote plaque accumulation and gingival irritation, leading to periodontal breakdown of abutment teeth.

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16
Q

When is a complete overdenture indicated?

A

It is indicated in cases with few remaining teeth unsuitable for fixed or removable partial dentures.

17
Q

Why is a complete overdenture suitable for patients with mobile teeth?

A

Reducing the coronal portion drastically reduces mobility, making them good abutments.

18
Q

How is a complete overdenture useful for patients with congenital defects?

A

It provides an effective treatment option for conditions like cleft palate, amelogenesis imperfecta, and partial anodontia.

19
Q

Why is a complete overdenture recommended for younger patients?

A

It preserves teeth and supporting bone, which is important for long-term oral health in younger individuals.

20
Q

Why are cases with torus palatines or mandibularies indicated for overdentures?

A

Overdentures can overcome issues with denture extension and retention caused by these bony protrusions.

21
Q

When is a complete overdenture contraindicated?

A

It is contraindicated in cases with poor oral hygiene, inadequate interarch space, abutments with mobility exceeding grade II, or decreased patient motivation.

22
Q

Why is periodontal condition critical for abutment teeth in overdentures?

A

Abutments must have optimum periodontal health to ensure longevity and success of the overdenture.

23
Q

How does abutment distribution affect the prognosis of overdentures?

A

More abutments improve prognosis, with two per quadrant or a tripod distribution being ideal.

24
Q

What is a simple tooth modification technique for overdentures?

A

Teeth are reshaped to eliminate undercuts, often used in patients with severe abrasion.

25
Q

When are cast copings recommended for overdentures?

A

Cast copings are used when there is sensitivity or as a caries control method.

26
Q

What is the purpose of telescopic overdentures?

A

They provide retention through frictional resistance between semi-parallel walls of copings and the denture base.

27
Q

How is amalgam used in endodontically treated teeth for overdentures?

A

Teeth are drastically reduced to gingival level and filled with an amalgam plug for space without increasing vertical dimension.

28
Q

What is the role of cast dowel copings in overdentures?

A

Cast dowel copings provide retention through a short post placed within the root canal, securing the overdenture.

29
Q

What is the purpose of attachments in overdentures?

A

Attachments provide retention and stabilization of the prosthesis, with types including rigid and resilient attachments.

30
Q

How do stud attachments work in overdentures?

A

A male stud is soldered to the prepared tooth and fits into a female housing embedded in the denture or substructure.

31
Q

What are the purposes of bar attachments in overdentures?

A

Bar attachments splint abutments and provide retention and support for non-parallel abutments.

32
Q

What is the advantage of bar joints over bar units?

A

Bar joints permit rotational movement, using more of the residual ridge for support, unlike rigid bar units.

33
Q

How are magnets used in overdentures?

A

Magnets are placed in the denture base, opposite to keepers cemented in abutments, providing retention with minimal lateral force transmission.

34
Q

What are mini implants, and when are they indicated?

A

Mini implants are small-diameter implants used in cases with minimal remaining bone, for extra retention in edentulous arches or under partial dentures.

35
Q

What are the advantages of mini implants in overdenture treatment?

A

Mini implants reduce bleeding, shorten healing time, allow placement in narrow ridges, and enable immediate loading.

Removable (5 decks)

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