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8/11/2019 RELING REBASING 1.ppt
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Relines and Rebases
Improving the Adaptation of ExistingDentures
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Is the procedures used to resurface the tissue
side of a denture with new base material, thusproducing an accurate adaptation to the
denture foundation area.
Relining : is the process of adding new base
material to the tissue surface of an existing
denture in a quantity sufficient to fill the space
which exists between the original denturecontour and the altered tissue contour.
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Rebasing:
Is the process of replacing the entire denture
base material on an existing prosthesis. Only
the original teeth and their arrangement
remain.
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Rebase
Replacing entire denture base
Flasking, heat-cured acrylic
Usually porcelain teeth
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Determine Cause of Looseness
Pivoting on bony structures
- PIP
Occlusal interferences
- Tactile, articulating paper, remount
Inadequate posterior palatal seal
- Pull upward & outward on lingual ofcanines
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Relines Will Only Solve Retention
Problems Related to Denture Base
Adaptation
Retention problems must be diagnosed
as to their cause
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Processed or chairside
Impression or functional technique
Hard acrylic or resilient
Permanent, temporary
Complete or partial dentures
Types of Relines
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Processed Acrylic Permanent
Complete Denture Relines
Make impression for least stable
denture first
Easier to stabilize the other denture
Reference for occlusion & vertical
dimension
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Adjust Occlusion
Obtain stable occlusal contacts
Remount & adjustment may be required
Assess need for tissue conditioning
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Remove Tissue Undercuts
Allows impression to be removed fromcast without breaking cast or denture
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Clean the Denture
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Border Mold
Relieve borders 2 mm short of vestibule
Border mold with compound
Maxillary posterior border at vibrating
line (indelible stick)
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Reduce Tissue Base
1 mm if acceptable interocclusal distance Use guide grooves
If interocclusal distance is excessive, relief
may not be required
Perforate denture with #4 round bur
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Impression MaterialPolyvinylsiloxane
Ease of use
Cleaning, removal from undercuts
Requires adhesive carried to the external
surface of denture borders
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Impression Procedure
Load carefully
Excessive material canreduce freeway space
Dry tissues
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Impression Procedure
Seat denture anteriorly
Slowly rotate posterior into place
Ensure denture is not too far forward
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Evaluate Impression
Trim impression to posterior border
Place / mark the posterior palatal seal
Check retention, extension, periphery
Remove excess (occlusal, facial etc.)
Ch k l ti i t ll
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Check relations intraorally
Send to lab for processing
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Deliver ASAP, usually next clinic
Same day in practice, if possible
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Impression TechniqueDisadvantages
Possible alteration in VDO, occlusion,
facial support
No chance to test retention and comfort
under function
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Functional Relines
(Lynal, Visco-gel)
Similar procedure
Minor variations
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Functional Relines
Material requires greater thicknessfor accuracy
Usually need to reduce denture to
allow for thickness
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Variation in Accuracy of Materials
(Visco-gel> Coe-Comfort)
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Lynal
10 ml powder : 2 ml liquid, mix 30 sec
If borders short or too thin, add more
powder for increased viscosity
Thicker consistency can be formed into a
3 - 4 mm rope and placed around borders
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Remove Excess
Reduce material on flanges with
HOTscalpel or knife Remove from teeth, oral surfaces
Patient wears reline home
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Patient Returns in 24-48 Hours
A cast is poured within 2 hours
Otherwise, accuracy compromised
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Functional Impression
Disadvantages Dimensional stability variable
Patient care
Pouring of casts
Can' t significantly increase borders
Do not use simultaneously as a tissue
conditioner
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Partial Denture Relines
Similar procedures
Ensure rests, direct and indirect
retainers are fully seated
Seat with pressure over the rests,
NOTthe distal extension bases
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Partial Denture Relines
Allow no impression material under
rests or guiding planes
If so, remake impression
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Partial DentureClinical Remount
If required, a new cast must be made
Make an alginate impression with the
RPD in place
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Partial Denture
Clinical Remount
Block out undercuts on the
framework while RPD is in the
impression
Pour the model with the partial
denture in place