Pros Flashcards by David Jack

What are the Kennedy classifications?

I - bilateral free end saddle
II - unilateral free end saddle (single saddle area)
III - unilateral bounded saddle (single bounded saddle area)
IV - anterior bounded saddle (crossing midline)

How well did you know this?

Not at all

Perfectly

What are the Craddock classifications?

1 (tooth supported) - teeth provide hard tissue resistance to occlusal loading
2 (mucosa supported) - large coverage provides resistance to occlusal loading
3 (tooth and mucosa) - combo of hard tissue and large coverage when there are reduced number of teeth and large edentulous saddles - free end saddles must have tooth and mucosa borne support

How well did you know this?

Not at all

Perfectly

What is support?

Resistance of a denture to occlusally directed loads

How well did you know this?

Not at all

Perfectly

What is retention?

Resistance of a denture to lifting away from the tissues (vertical dislodging forces)

How well did you know this?

Not at all

Perfectly

What is indirect retention?

Resistance to rotational displacement of the denture

How well did you know this?

Not at all

Perfectly

Different clasp materials require which level of undercuts?

CoCr - 0.25mm
Gold - 0.5mm
SS - 0.75mm

How well did you know this?

Not at all

Perfectly

What makes an RPI system?

Mesial occlusal rest
Proximal plate to permit movement
Gingivally approaching I bar clas

How well did you know this?

Not at all

Perfectly

What clearance is needed for a lingual bar?

8mm
3mm gingival margin
4mm for bar
1mm for FoM9

How well did you know this?

Not at all

Perfectly

What does the Fox’s Occlusal Plane Guide do?

Used to set occlusal plane

How well did you know this?

Not at all

Perfectly

What does the Willis bite gauge do?

Measures OVD, RVD and FWS

How well did you know this?

Not at all

Perfectly

What lines should be marked in a jaw reg?

Smile line - so teeth set at correct height and correct amount of gum showing
Central line/midline - to orientate central incisors
Canine line - to set canine position

How well did you know this?

Not at all

Perfectly

What references are used in a jaw reg?

Ala tragus line for posterior occlusal plane
Interpupillary line for anterior occlusal plane

How well did you know this?

Not at all

Perfectly

Name 2 common faults with metal framework casting

Error in casting - CoCr bubbles making surface rough - due to air bubbles trapped on wax pattern investing
Errors in design - too close to gingival margin, undercuts not blocked out

How well did you know this?

Not at all

Perfectly

Name 4 common faults prescription faults with CoCr between drawing and writing

Support - rests missing, no posterior stop
Retention - ring clasps around the wrong way
Connector - siblingual bar instead of lingual bar
Check for indirect retention, appropriate reciprocation for clasps

How well did you know this?

Not at all

Perfectly

Give instructions on primary imps and the lab card

Use edentulous drays for completes
Primary imp in alginate or IC
Stand in front for lowers, behind for uppers
Please pour casts in 50/50 dental stone/plaster and construct special trays in light cured PMMA with 2mm spacer for alginate, 1mm for PVS, non perforated trays
Please return trays with casts

How well did you know this?

Not at all

Perfectly

Give instructions for surveying casts

Mount cast and tripod - draw 3 lines with analysing rod and pencil
Analysing rod to analyse abutment teeth and soft tissue undercuts
Pencil rod to mark survey line of all abutment teeth and soft tissue undercut
Determine whether cast needs to be tilted for POI
If so tilt and mark new lines with red rod
Mark the clasp positions with pencil

How well did you know this?

Not at all

Perfectly

What kind of articulator are casts mounted on?

Average value or semi adjustable

How can you resolve a missing anterior flange?

Remove undercuts
Build flange with greenstick and reline
Rebase if not possible

How can you resolve a midline diastema in a complete denture?

If you want to keep physical aspects of denture but change aesthetic only:
- replica (2 stage putty around denture, Vaseline to separate)
- wax replica used for functional imp and jaw reg
- ask lab to close diastema for tooth trial stage
Remake if other problems

How can you resolve an unextended denture posteriorly at the tuberosities?

Reline - if functionally good and this is only problem
Remake if everything is bad

How can you resolve a locked occlusion in complete dentures?

Remake with replica technique and use cuspless teeth

How can you resolve a complete denture if the baseplate is too thin?

Rebase thicker or rebase using high impact resin
Or remake

How can you resolve a poor denture fit due to tori?

Relieve clinically if only problem
If now too thin or other problems - rebase or remake and ensure the lab waxes undercuts

How can you fix a denture with incorrect tooth position?

Remake

How can you fix a denture if the occlusal table is wrong?

Remove posterior teeth or remake

What is a denture reline?

Replacement of a denture fitting surface Use low viscosity light body PVS When the fitting surface is inadequate but denture otherwise okay

What is a denture rebase?

Replacement of the whole denture base When you want to keep the occlusal surface but change the fitting and polished surface

What are the common problems with an imp surface and how are they resolved?

Poor imp (lack of post dam, poor adhesion to tray) Damage to cast Solution - reline/rebase, remake, add post dam using reline

What are the common problems with occlusal surfaces of dentures and how are they resolved?

Premature occlusal contact Centric occlusion not conincident High lower occlusal plane restricting the tongue Locked occlusion Solutions - cuspless teeth, selective grinding, re-recording centric occlusion, remake

What are the common problems with polished surfaces of dentures and how are they resolved?

Caused by overextension, underextension or not in the neutral zone Solutions - remove overextension (esp lingual lower), use PIP allow frenal relief and add greenstick to underextension and reline, remake if extensive

What common problems are found in denture wearers?

Poor neuromuscular control eg - stroke, Parkinson’s Unstable foundations: - Anterior flabby ridge - Atrophic lower ridge - High frenal attachments - provide relief - Palatine tori - provide relief on cast first Xerostomia

What can you do if an anterior flabby ridge is causing problems?

Perforated trays and light body PVS imp Or a special tray with a surgical window and take wash imp

What can you do if an atrophic ridge is causing issues?

Admix technique - use 3 parts imp compound and 7 parts greenstick

What makes a denture prone to fracture?

Thin, under extended or absent flanges Previous repairs Stress concentrators - large frenal notch, midline diastema Poor fit Lack of adequate relief Tooth wear

What can be used to prevent denture fracture?

Inclusion of a metal palate Use of an alt denture base material such as high impact acrylic resin

How is a simple midline fracture repaired?

Secure two fragments in position with sticky wax and additional reinforcement such as wooden sticks Send to lab - light cured PMMA used because easier to process but is weaker than heat cured

How is a denture in multiple fragments fixed?

May be necessary to reposition the larger of the fragments intra orally and take an in situ overall imp in alginate If not possible then remake

How can you repair fractured or missing denture teeth?

An imp of the opposing dentition and/or the denture required to ascertain the correct occlusal relationship

Give instructions for relining a denture?

Check occlusal relationships are fine Remove undercuts from dentures fitting surface with acrylic bur Adjust border for over/under extensions with greenstick Apply adhesive to fitting surface of denture to be refined Insert imp material (light body VS) into fitting surface and seat the denture Functional imp - ask the pt to bite together so the imp is taken in OVD Take a lower imp with a denture in situ - gold standard may not be required Take a bit reg if OVD not obvious When set remove imp and send denture for reline

What should you write on a lab card for a denture reline?

Please pour imps in 100% dental stone using imp provided Please mount to cast and create a self cure PMMA reline to change the imp surface