Give denture hygiene / cleaning instructions
Clean morning and night over full sink of water to avoid breakage if dropped
Clean it after meals too
Do not use toothpaste, but neutral soap and water, as toothpaste is abrasive
Take it out at night and leave it in water overnight
Clea it twice per day for 15 mins in sterident / according to manufacturers instructions of denture cleaner
What are the Kennedy classifications?
Class 1 - bilateral free end saddle
Class 2 - unilateral free end saddle
Class 3 - bounded saddle
Class 4 - bounded saddle crossing midline
What are the craddock classifications?
tooth borne support - hard tissue is resistance bearing
Mucosa supported
Tooth and mucosa supported
What is the RPI system?
Rest - mesial occlusal rest
Proximal plate - adjacent to saddle - 2-3mm guide surface with an undercut to allow for natural movement of the tooth
I bar clasp - gingival approaching engaging greatest prominence
Clearances needed for lingual bar?
3mm to gingiva
4mm to for the bar thickness and then 1mm from FOM
What lines are needed on the jaw registration?
What reference lines are used and where?
Midline
Canine lines
Smile line
Ala-tragus line - used for aligning the occlusal plane
Interpupillary line - ensure flat occlusal plane with the eyes
What errors may there be on a CoCr denture on a cast? / what to look for and check on these?
Fault with the metal framework
- incorrect design
- incorrect patient
- error when casting resulting in bubbles and rough surface caused by air bubbles in wax burn out
- error in design - too much gingival margin coverage, undercuts not blocked out etc
Faults with prescription
- needs more rests / support
- requires more clasps / clasps not engaging undercuts
- sublingual bar instead of a lingual bar etc - check the connector
What to write on lab card for primary imps
Please pour casts in 50/50 stone (or improved stone for CoCr)
- construct special trays in light cure PMMA with extra oral handle and finger rests, non perforated and 2mm spacer.
What undercut is needed for a CoCr clasp?
0.25mm
What is a denture reline? How is it done and what are the limitations?
Denture reline is where there is a replacement of the fitting surface of the denture
Done by taking imp in light body PVS with current denture and then alginate over the denture
Limitation
- increases thickness of denture as incorporates new impression material - so use light body PVS
Good for mandibular dentures but not maxillary as makes them heavier
What is a denture rebase?
How is it done?
Replacement of entire denture base
Undercuts removed from the denture first with an acrylic trimmer
- wash impression with closed mouth technique
- imp of denture in mouth with alginate
The lab will then make an overplaster and deal with the rest!
How take a flabby ridge imp?
Primary imp in alginate then ask for a special tray with a window over flabby ridge
- take first imp in mucocompressive material such as ZoE
Then remove any debris from window
- Reinsert imp with a light / medium body PVS over the window to take a mucostatic impression
Common types of denture fracture?
Midline
Tooth lost from base
Flange broken
Acrylic saddle detach from CoCr base
Clasp fracture or bent
How repair a simple fracture e.g. midline or denture in 3 big pieces
- if they can be located, just send to lab after disinfection. They will pour cast and use acrylic to fix denture
How repair denture where piece missing e.g. flange broken off?
Take impression of the denture in the mouth
- disinfect and send to lab
