Pros clinic/ tutorial Flashcards
What is the problem with the denture when the patient’s “s” sound is too long?
No FWS
Why would a patient have pain but no trauma/ ulcer?
Problem with SUPPORT.
Check support areas
Why does a denture fall down when eating?
Abnormal occlusal contacts, tipping the denture and breaking the peripheral seal
What is COMBINATION SYNDROME?
Associated with FLABBY RIDGE
Generally when there is an edentulous maxilla and they only have lower 3-3 (anterior) teeth.
All the biting force is on the upper 3-3 ridge, so the bone resorbs and mucosa thickens, resulting in a flabby ridge.
Where do lower teeth sit 90% of the time in dentures and why do they sit here?
ON THE RIDGE
Because that is where the teeth were before - mandible resorbs DOWNWARDS.
Where do teeth sit in relation to alveolar ridge in maxillary dentures?
BUCCAL to alveolar ridge in order to keep in contact with mandibular teeth
*NOTE - maxilla resorbs upwards and inwards
When do you use ICP?
When there is enough index teeth for inter-digitation
What is the minimum distance between clasp arm and gingival margin?
1-2mm
What percentage of clasp arm must engage undercut to be effective?
1/3
What does the other percentage of the clasp arm that DOES NOT ENGAGE in the undercut do?
Provides BRACING
What is a RE-BASE?
Changing ALL of the acrylic in the denture - NOT JUST THE FITTING SURFACE
Remove ALL acrylic EXCEPT the acrylic under the horse-shoe of teeth. Need to take new primary impression.
How do clinically check RETENTION of dentures?
Fingers on premolars and tug downwards
How do you clinically check STABILITY of dentures?
Fingers on premolars and ROTATE
How do you clinically check SUPPORT of upper dentures?
Put finger on palate and pull forward to check post-dam seal
Why do you get patient to move their tongue when taking an impression?
To capture the functional sulcus
Border moulding of the lingual pouch
When doing a jaw registration for partial dentures, why do you put soft wax ONLY on the saddle areas?
Otherwise would prop bite open.
Need to see index teeth touching to ensure OVD isn’t propped open.
Briefly describe how to do a RE-LINE?
If base extension is good, trim any obvious undercuts on lower denture
Mix the re-line material, put in denture - cover entire are but not super thick
Get pt. to slowly close and bring teeth together.
Ensure mid-line is accurate and teeth touch together.
What impression material should you use for super resorbed mandibular ridge?
Impression compound - more stable??
What is the definition of SUPPORT?
Resistance to occlusally directed load
Given by rest seats
What is the definition of RETENTION and different types?
Resistance to vertical displacement forces.
Can be:
Mechanical - clasps/guide planes,
Muscular - buccinator, orbicularis oris,
Physical - cohesion and adhesion
What is the definition of STABILITY?
Resistance to horizontal displacement forces in function e.g. keep denture in neutral zone
What is the definition of INDIRECT RETENTION and how is it provided?
Resistance to rotational displacement forces.
It is provided by supporting components e.g. a rest preventing disto-vertical rotational displacement of a saddle. Should be ideally 90° to the axis of rotation. Should be on the opposite side of the axis of rotation to the displacing force. Mainly used in free end saddles.
