Complete Dentures - Overdentures

Question 1

Two most important features of dentures

Answer 1

Denture retention - establish good peripheral seal

Denture stability

Question 2

Overdenture

Answer 2

One which gains support party/wholly from roots of retained, decoronated or crowned teeth
Roots are retained to prevent resorption of bone in alveolar ridge and allow denture to be held in place

Question 3

Advantages of retaining roots

Answer 3

Root preserves the associated alveolar bone
Root face gives extra support 
Extra retention via attachments
Psychologically benefit 
Retained proprioception

Question 4

Root face provides

Answer 4

Extra support

Allows enamel to support

Question 5

Extra attachments

Answer 5

Magnetic

Question 6

Disadvantages of retaining tooth

Answer 6

More expensive
Failure can occur due to caries
Takes longer

Question 7

Indications for patients

Answer 7

When thought alveolar resorption will be significant
Repeat alterations may be undesirable
When increases of face height may occur due to toothwear/hypodontia

When it is thought adaptation might be poor and extra retention needed

Question 8

Unopposed md anterior teeth predispose accelerated

Answer 8

MAXILLARY ATROPHY

Question 9

Individual tooth selection for overdentures
Root

Tooth site

Why are premolars/molars not good?

Bone

IDEAL

Answer 9

Simple root canal shape in case of endodontic need
Adequate root size - sufficient support

Near canine region, opposed if possible, not in contact

Uneven shape/Predisposed to periodontal problems

No buccal undercuts

Canines

Question 10

Types of overdenture

Answer 10

Immediate - impression then decoronate remaining teeth

Transitional (temp) - addition to RPD

Permanent/replacement - permanent with retentive mechanisms

Question 11

Immediate denture - what is needed

Aftercare

Answer 11

Extractions
Canines to be retained

OHI and fluoride care