dental practice July 2009
Preston’s Restorative Report
www.dental-practice.org
Denture lining materials
CPD
Tony Preston BDS PhD FDSRCS
I
N order to correct defects of a For this and following reports, the could not revert to a “spare” set while The embarrassing consequence of
denture’s impression or fitting various types of denture reline a laboratory reline is being processed. this error is that the relined denture will
surface that might give rise to materials will be considered in detail. Another indication for the use of “lock” into the undercuts, preventing
patient complaints such as pain or these materials is when one is treating a withdrawal of the prosthesis.
looseness, denture lining (reline) Chair-side rigid (hard) patient as a domiciliary case. These A careful watch should therefore be
materials can be used. denture reline materials materials can also be used for kept on the various stages that the
One should, however, accurately – If it is possible to provide a immediate dentures, when the fit of the reline acrylic goes through and the
diagnose that there is, indeed, a lack of satisfactory acrylic reline for a prosthesis has been lost through clinician should check that the denture
fit of the impression surface of a prosthesis at the chair-side, without the alveolar bone resorption. can still be withdrawn, before the final
denture (usually due to alveolar need for sending the denture to the Chair-side rigid denture reline (hard) set is attained.
resorption) before providing, for laboratory (and thereby incurring an materials can be difficult to adjust and Chair-side rigid reline materials are
instance, a hard denture reline. inconvenience to the patient), then this polish at the periphery where the reline flexible in their use. When indicated,
Sometimes, clinicians can approach will have obvious attractions. material has a junction with the heat- they can be used for complete
inappropriately provide relines after Chair-side or cold-cure acrylic reline cured acrylic baseplate. dentures, immediate dentures and
having incorrectly diagnosed the reason materials often consist of a Over a period of time, there tends to removable partial dentures. They
for a denture’s lack of retention. This polyethylmethacrylate powder that is be a deterioration of this junction and should not, however, be used instead
can make a clinical situation worse. mixed with a liquid butylmethacrylate so these materials are not usually of a laboratory reline, if a more long-
Denture reline materials can be monomer. These materials are considered to be “permanent” or term result is required.
classified in various ways. One could sometimes termed self-curing or particularly long-term in nature. In the next report, further aspects of
differentiate these materials in terms of autopolymerising resins. If these materials are used where denture lining materials will be
their rigidity (hard or resilient reline These materials come into their own there are significant undercuts, for described.
materials), the length of time for which when there is a specific reason for not instance, in the case of an acrylic
the material will give service (long-term having the denture taken from the removable partial denture reline around
Dr Tony Preston is a
or short-term reline materials), or patient for a period of time, to be sent natural teeth abutments, then one has
senior lecturer and
whether the reline material is used in a to the laboratory for a laboratory- to be careful not to let the reline acrylic
honorary consultant in
chair-side (direct) manner, or involving processed reline. An example of when fully set into the undercuts on
restorative dentistry at
the University of
an impression being sent to the this might be relevant is if the patient placement. This is easily done around
Liverpool
laboratory – an indirect approach.
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13
DP July 09 8, 10, 12-20, 22.indd13 13 24/6/09 13:15:07
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