Overdentures Flashcards
What is an overdenture?
A prosthesis that obtains its support from 1 or more abutment teeth by COMPLETELY ENCLOSING the them beneth the impression surface
Why may an overdenture be more favourable than a complete denture?
Improved stability
RETAINS ALVEOLAR BONE LEVELS
What is the average rate of resorption in edentulous patients?
Mandible: 9-10mm loss over 25 years
Maxilla: 2.5-3mm over 25 years
What did Crumm and Rooney 1978 discover
Significantly less bone loss in overdenture group compared to omplete complete groups
Benefits of maintaining alveolar bone height
Increased denture bearing area therefore more retention
Resistance to to “horizontal” movements, increased stability
What are the issues of overdentures
High degree of maintenance
caries and periodontal disease
Fracturing of acrylic due to to thinner design
What are common indications of overdentures
Any situation where maintenance or support is indicated–> Single complete denture
hypodontia
cleft palate
Contraindications of overdentures
Any issues concerning compliance or stability of teeth–>
Extremes of age
Mental handicaps
Conditions that precludes RCT
Describe the clinical stages of overdentures
Exam and investigations Treatment plan Stabalisation- perio/ Endo Denture construction PREPARATIONS OF ABUTMENTS Review
What is important in abutment selection
fantastic structural integrity-RCTs possible
Must have 2, of equal distance
Cleansable
What is are the most favourable teeth for abutments?
Canines (round and large)> Premolars> molars(requires reshaping)> incisors
How can abutments be modified?
Doming (simple but not precise)
Telescopic copings
How will denture attached
Patrix (male) soldered on coping
Matrix (embedded on fitting surface)
What attachments can be made on patrix
Stud ball attachment
Locator attachment
Magnets
Where are implants located on mandibulars
2 Intra-foraminal
