2. Reline
Addition of Material to the tissue side of a
denture to improve its adaptation to the
supporting mucosa.
Resurfacing the tissue surface
Jig used to maintain vertical dimension &
occlusal contacts with cold-cure acrylic
Or
Reprocessing with heat cure
3. Rebase
Replacement of the entire denture base material
to improve its adaptation to the supporting
mucosa
5. Reline: General Considerations
Optimal tissue health
Reasonable CR/CO
Adequate vertical dimension
Adequate peripheral extensions
6. Also relining cannot be used when
No free way space
Lack of balanced occlusion and articulation
Non-alignment with optimal denture space
Incorrect contour for neuromuscular
control.
8. Hard relining
Aims: Provides even contact between the
impression surface of a denture and its
supporting tissues, thereby improving
retentive forces and support.
10. Chair side (Direct relines): Indications
1. Where no longer than 6 weeks is
required
2. Around overdenture abutments
3. Border additions
4. RPD base areas
11. Resilient soft linings
Aims : to absorb the impact
energy of masticatory forces
and distribute it more evenly
over the supporting tissues.
12. Indications of soft lining
It is most effective when used over
corticated bony elevations.
Use to improve retention by engaging
undercuts.
Not advised where mental neurovascular
is superficially placed.
13. Disadvantages of soft linings
Tend to peal off the hard acrylic denture
base (acrylic material adhere better).
Difficult to adjust (acrylic materials more
easily altered).
Porous, tending to absorb fluids ) with
resultant swelling and bad odour) due
to harbor bacteria and fungi
14. Disadvantages of soft linings
Need more thickness to be
effective this may be weaken the
denture specially the lower.
Rapidly deteriorate
some patients can become
habituated to such linings and
cannot be satisfy with hard tissue
surface.
Rub the oral mucosa since they
deform under masticatory pressure.
25. Denture base inadequate requiring repair material to be
used to extend the base.
Excessive space between arches.
Excessive wear of the teeth requires new teeth be placed on
the partial denture.
The rebase is used when the base is fractured
Replace teeth if worn out, unesthetic, infraocclusion,
broken, etc
REBASING:
27. Repairs and additions to partial dentures
Accidents or careless handling of the denture
by the patient might result in a need for repair.
The following are some of the repair
procedures which might be necessary in these
cases.
28. Broken clasp arms
The most common type of
repair is the replacement of a broken
clasp arm. Breakage may result from
repeated flexure into and out of too
severe undercut
29. A broken retentive clasp arm
Regardless of its type, may be replaced with a
wrought-wire retentive arm embedded in a resin
base or attached to a metal base by electric
soldering.
Broken retentive arm of
A circumferential clasp
31. Repair by electric soldering between minor and major
connectors ( Repair is not strong as the original)
Electric soldering
machine
soldering between clasp
and base
34. Wrought Wire retentive arm attachment
Laser weld to
framework mesh or
bead
arm attached to a metal base by
electric soldering.
35. Loss of an additional tooth
If for some reasons a tooth is to be
extracted, the addition of such a tooth to the
partial is usually a simple procedure where the
bases are made of resin. When the base is made
of metal the procedure is more complex and
necessitates either casting a new component or
adding it by soldering, or creating retentive
elements for the attachment of resin extension
carrying the added tooth.
36. A new component or adding it by soldering
to replace lost tooth
Cast weld
37. Repairs a broken continuous clasp
and lingual bar by laser welding
38. Broken Occlusal Rests
Breakage of an occlusal rest almost always occurs at
the point where it crosses the marginal ridge, due to
weakness at this point. Improperly prepared occlusal
rest seats are usually the cause of such weakness.
In case of broken occlusal rest it is always best to
replace
the whole clasp assembly.
