Eruption

Question 1

What is eruption?

Answer 1

The process whereby a tooth moves axially from its developmental position within the alveolar crypt into its functional position within the oral cavity

Question 2

What one thing has been found to be essential for eruption?

Answer 2

Dental follicle

Question 3

What are the 5 different phases of eruption?

Answer 3

1. intraosseous
2. Mucosal penetration
3. Pre-occlusal eruption
4. post-eruptive movements
5. overeruption of unopposed teeth

Question 4

What are the different post-eruptive movements needed for?

Answer 4

To accommodate for growing jaws, compensate for occlusal wear, accommodate interproximal wear

Question 5

What are the processes required for eruption?

Answer 5

Mechanism to generate eruptive forces, forces must be translated into movement through the surrounding tissue, it must be sustained to enable the tooth to be supported in its new position and must occur alongside remodelling of the surrounding periodontal tissues to maintain functional integrity

Question 6

What are the 6 theories of eruption?

Answer 6

1. cushioned hammock
2. pushed by growth of root
3. pushed by increased vascular/tissue hydrostatic pressure
4. pulled by periodontal fibroblast motility/contraction
5. alveolar bone modelling
6. formation and renewal of periodontal ligament

Question 7

Which is the strongest theory for intraosseous eruption?

Answer 7

Alveolar bone modelling

Question 8

Which other factors can affect eruption (4)?

Answer 8

• Hormonal control mechanisms
• physical control mechanisms
• primary failure of tooth eruption
• genetic disorders of eruption (osteopetrosis, cleidocranial dysplasia/dysostosis)