Define retention form.
Crowns
Resistance to vertical displacement along the long axis
Define resistance form.
Crowns
Resistance to displacement in any direction other than the long axis
What is the ideal convergence angle of a crown prep?
Crowns
12-14 degrees
What is the ideal taper of a crown prep?
Crowns
6 degrees
What is the ideal depth of an occlusal rest seat for a denture?
Denture design
1mm
What is the ideal design of an occlusal rest seat?
Denture design
- rounded base, divergent walls
- square angles under masticatory force will cause cusp fracture
How do you give your crown prep resistance form?
Crowns
Apical 2mm of prep circumference should be close to parallel
How do you add a crown into a denture that is prexisiting?
- duralay
- take alginate of temporary restoration
- add duralay and ensure denture fits over
- cast crown
What pathological changes can be associated with dentures?
- lichen planus
- ulcers
- denture stomatitis
- angular cheilitis
- denture hyperplasia
- flabby ridges
- MRONJ
- allergic reactions
What are common sites of ulceration from dentures?
- lingual frenum
- mylohyoid ridge
- undercuts
How do you manage ulceration caused by dentures?
- identify (PIP, articulating paper)
- ease (occlusal adjustment, trim and polish base)
- review
How do you manage denture stomatitis?
- nystatin or fluconazole
- tissue conditioner on fitting surface on dentures
How do you manage angular cheilitis?
Miconazole
What causes angular cheilitis?
- overclosure (loss of OVD or excessive FWS)
- old worn dentures
How do you manage denture hyperplasia?
- major ease of denture
- tissue conditioner
- review and repeat as necessary
- new denture
What is an example of tissue conditioner?
Coe comfort
How do you manage suspected MRONJ from dentures?
Prompt referral to OMFS
