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Question 1

Ways of facilitating increased crown height

Answer 1

Surgical crown lengthening whilst maintaining the existing occlusal vertical dimension-

Changing the jaw relationship whilst maintaining present occlusal vertical dimension-

Changing the jaw relationship and increasing occlusal vertical dimension

Question 2

Short clinical crown height can cause what problems:

Answer 2

Lack of resistance and retention
Poor aesthetics

Solution- can be crown lengthening with or without ortho treatment to allow more over jet

Question 3

How much is usually a difference between ICP and RCP

Answer 3

Around 1-1.5 mm, usually not more than that

Sometimes, RCP is more posterior to the ICP allowing some space in the anterior region allowing space for restoration

When mounted, if occlusal contact on th retruded arc of closure are eliminated, it will deflect the mandible into a more anterior path of closure

Question 4

Does tooth wear leads to loss of occlusal vertical dimension

Answer 4

Not if opposing teeth make contact and that is mostly due to continuing eruption of the teeth
So, teeth continue to erupt and bring the alveolar bone and gingival tissues with them leading to an increased display of soft tissue

• In the absence of significant tooth wear, facial height increases throughout life (distance from the nasion to the chin increases)

Question 5

What is another problem with tooth wear

Answer 5

Loss of occlusal stability

Question 6

How is eruption/intrusion different in different age groups

Answer 6

In younger pt- eruption is the dominant movement
In older pt- less eruption and more intrusion as there is a gradual loss of eruption potential; takes longer for reastablishment of occlusion

Dahl - mainly for erosive wear but not for bruxism and parafunction