Repair, additions and relines

Question 1

In situ impression?

Answer 1

An impression which is taken with the denture in place and impression with denture still in is sent to lab

Question 2

How to repair a clean break when both part are still present?

Answer 2

Don’t need in situ impression but probs best take one anyway

This may require the addition of strengthening wire of mesh if PMMA cannot be made bulky enough

Question 3

Think why recurrent breakages are occuring?

Answer 3

Does the denture have a well defined poi that doesn’t put stress on any particular areas where the pt takes it in and out

—> can you do anything to improve this

Question 4

What to do when flange is broken?

Answer 4

Send the denture and broken bit if it fits exactly back

Otherwise take an in-situ impression and send the whole lot to the lab to shape up a new flange area in cold cure acrylic

Question 5

Think why the flange area broke?

Answer 5

Deep undercut in that area - partial flange more appropriate?

Are there opposing tissue undercuts on flange areas that need eased slightly or eve best left off

Or was the acrylics left very thin in this area - especially immediate dentures where teeth and bony tissues remain

Question 6

What do you do if you want to make major changes to flange areas?

Answer 6

Border mould in order to support new impression material

Question 7

Is it easy to repair a tooth that has come off of denture?

Answer 7

Yes

Question 8

Think why a tooth has come off of the denture?

Answer 8

Is it the pt bite - may need to ease contact

Has it come off comely cleanly - this points to a processing problem with the bond of the acrylic, are the rest posed to doing the same in time

Question 9

How to fit a tooth back into denture?

Answer 9

If intact and part fit back, it can be easily re-attached with cold cure acrylic

Question 10

What is a processing probelm why a tooth would come away from a denture?

Answer 10

Most likely a waxy layer or cold mould seal not cleaned off the denture tooth ridge lapping area before the acrylic was packed this affecting the bonding of the acrylic teeth to the base material during processing

But remember to check to bite in case that is the issue for de-bond

Question 11

If a tooth is broken or deboned, how do you know it was due to occlusion?

Answer 11

If the denture was not dropped or mishandled

Question 12

What to do if a denture breaks due to occlusion?

Answer 12

An opposing impression and bite registration put to the lab along with overall impression with the denture in situ for the technician to hopefully be able to place a new tooth in more appropriate position

Question 13

What todo if clap breaks?

Answer 13

Take overall alginate impression/ denture in situ and send to the lab to laser weld repair r replace with stainless steel clasp (usually attached to the nearest flange by cold cure acrylic)

Question 14

Think why a clasp would break?

Answer 14

• is the class designed to fit the or react depth of undercut
• is the connecting arm long enough for flexibility
• were you trying to tighten a chrome clasp and it broke on you
• are there any other visble pits or rough areas visible

Question 15

What do pits or rough areas visible in the metal indicate?

Answer 15

Manufacturing issue or porosity in the casting

Question 16

Where are common areas for breaks in a chrome?

Answer 16

Minor connect to clasp / rest assembly

Question 17

What to do if minor connector up to a clasp breaks?

Answer 17

May be possible to laser weld the whole component back on or a new cast component if lab has this equipment

Otherwise the framework will nee re-made and a very temporary erasure of adding stainless steel clasps may be possible meantime

Question 18

Think why a minor connector to a clasp/rest would break?

Answer 18

Was the minor connector leading up to the rests from the plate at least 1.5mm

Is there enough room in the bite for this without prepping this and/or the embrasure area before remaking

Question 19

Required width for a minor connector upt to a rest?

Answer 19

1.5mm

Question 20

What to do if major connector breaks?

Answer 20

May be possible to laser weld as before

Bit is it ever appropriate to repair the major connector as more than a temporary fix

The whole saddle area could be temporarily replaced by thinning down and adding holes to the metal in the palate area create a chamfered adage with mechanical retention for cold cure acrylic but is the bite appropriate for this

Question 21

Where can chrome dentures only be relined?

Answer 21

Chrome partial dentures can only be relined in tissue bearing extensions and not areas involving connectors

Question 22

How to reline chrome p/p?

Answer 22

Some material removed to make room for light bodied impression to be taken with the closed mouth technique so as not affecting the existing occlusion

A dose impression for the reline and repair of a Kennedy class II RPD. Note the light-bodied wash impression in the tissue bearing surface of the distal extensions only and overall impression in-situ

• technician casts model
• follows Sam redlining procedure for full dentures by making plaster check bite, removing wash impression and filling space with cold cure acrylic
• could also use was in order to flask and process as a heat cures

Question 23

When is it possible to reline a chrome denture?

Answer 23

As long as the frame work still fits closely and it is just a case of resorption or saddle areas

Question 24

What is the most importantly thing to think about when redlining p/p?

Answer 24

The fit of connectors and clasps

Make sure you tidy up any areas of the wash impression that are extending into areas of standing teeth before you take the overall alginate

Question 25

What happens if you don’t tidy areas of the impression that are extending into free standing teeth before you take the overall alginate impression?

Answer 25

These will create voids and the impression will fill with new acrylic

Will either have its of trimming to do chair side and stress

Or wont go back in and need remade