Prosthodontics Flashcards
What are the general statistical trends for tooth loss, in Scotland?
More teeth are lost with age
More teeth are lost in more deprived areas, than less deprived areas
What are the 4 main impacts of tooth loss for the individual?
Mastication and speech
Pain/discomfort
Appearance/self-esteem
Social interactions
What are the 6 main reasons for tooth loss?
Congenitally missing Trauma Periodontal disease Caries Pulpal disease Other pathology
What is the typical pattern for tooth loss?
Lost either singly or in small groups
A partially dentate state may last many years and never progress to edentulism
What are examples of congenital disease that can lead to tooth loss?
Hypodontia
Ectodermal dysplasia
Cleft lip and palate
Why can periodontal disease lead to tooth loss?
Loss of periodontal ligament support, and so loss of anchor into the gomphosis
How does pulpal disease cause tooth loss?
Originates from infection
Dendritic cells differentiate into osteoclastic-like cells that resorb the dentine
What other examples can cause tooth loss?
Cancer treatment
Ameloblastoma in the mandible
What is the definition of a shortened dental arch?
A reduced dentition primarily resulting from the loss of mailar teeth with the aim of preserving a functional dentition for long-term use
What are the prerequisites for a shortened dental arch?
20 or more functional opposing teeth
Including anterior teeth
At least 4 occlusal units
Name different types of occlusal units and there values?
1 unit = occluding premolar
2 units = occluding molars
What are the pros and cons for a shortened dental arch?
Pros:
- adequate chewing
- aesthetics not significantly compromised
- tooth migration may occur but stability is maintained
- TMJ healthy
- no change in wear
- avoid use of potentially damaging partial dentures
What are the 3 main factors for damage to the oral cavity with a partial denture?
Biological
Direct trauma
Mechanical effects
Explain how biological damage can a partial denture cause?
Dental plaque:
- increase caries and perio as they are plaque traps
Explain how direct trauma can a partial denture cause?
Acrylic engages into the embrasure spaces for stability, resistance and retention
Can lead to accelerated alveolar bone loss and recession
Otherwise known as ‘gum stripping’
What is the definition of an extra-coronal restoration?
One that which is outside or external to the crown portion of a natural tooth
(sits over remaining tooth structure)
Name 3 types of extra-coronal restorations?
Full coverage gold shell crown
Ceramic crowns
Gold inlay onlay
Name the 4 different types of indirect extra-coronal restorations?
Veneer
Onlay
Partial coverage crown
Full coverage crown
What is the definition of a veneer?
A thin sheet of material used to finish or protect an ornamental facing. It is a superficial or attractive display with many layers
What is the definition of a onlay?
Partial coverage restoration that restores one or more, cusps and the adjoining occlusal surface, and is retained by mechanical or adhesives means.
What is the definition of a partial coverage crown?
An artificial replacement that restores missing tooth structure, surrounding the remaining structure with a dental material. Retained by mechanical or adhesive means
What is the definition of a full coverage crown?
An artificial replacement that restores missing tooth structure, covering the full coronal surface of with tooth with a dental material. Mechanical or adhesive means
What are the main reasons for the use of a indirect extra-coronal restoration?
Support for remaining tooth tissue in broken down teeth
To prevent microleakage (infection spread)
Aesthetics
In what order should treatment be planned?
- relieve pain
- cause related therapy
- initial reassessment
- basic operative care
- reassessment
- reconstructive therapy
- recall and maintenance