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Diagnosing denture problems usingpressure-indicating media
Robert W. Loney, Mark E. KnechtelJ Prosthet Dent 2009;101:137-141
Purpose
Provide guidelines for optimal use of the media
To identify alternative uses that could be considered in daily practice
Patients often cannot precisely pinpoint the location of irritations.
Never be modified without first using media toidentify specific areas requiring adjustment.
Commonly used media
Nonsetting and cream-based (Pressure Indicator Paste; Mizzy, Inc, Cherry Hill, NJ)
Nonsetting aerosol powders (Occlude; Pascal Intl, Inc, Bellevue, Wash)
Media that polymerize (typically catalyst/base elastomers such as Fit Checker)
Procedure
Remove any obvious spicules or sharp projections from the denture
Evaluate the denture base adaptation prior to occlusal adjustments
Dry the denture and Moist the oral mucosa
Application of media
Cream types:
apply sufficient material so that the base appears to be primarily the color of the media
Use a stiff brush to place pronounced streaks in the material
For Polymerizing materials
As thin a layer as possible to completely obscure the underlying denture
Do not place streaks in elastomeric materials.
Seat dentures with polymerization-type materials before the start of polymerization
Insertion of denture into mouth
Using mouth mirror
Quadrants, periphery and denture base separately
Seating the prosthesis
Use light pressure initially – ensure comfort
Apply firm pressure in the area of the first molars
Do not allow occlusal contacts – tipping of denture
Exert pressure perpendicular to the occlusal plane
Evaluating flange extensions
Stabilize the denture over the occlusal
surfaces of the teeth
The patient makes functional movements
Clinician manipulates the cheeks or lips
Because of moveable mucosa and frena, which typically do not displace
media
Interpretation of media
For nonsetting pastes:
areas where streaks remain - no contact with tissues
areas with paste but no streaks - acceptable contact
areas without paste - excessive pressure or impingement
For polymerizing pastes: areas of excess pressure - uncovered, or
more lightly covered
Different thickness, different viscosity can be used
Caution
Undercut areas
expect slightly more pressure on primary bearing areas
Commonly adjusted areas
Maxillary areas : ▪ Vestibular sulcus – 41%▪ Maxillary tuberosity – 21%▪ Hamular notch – 12%
Mandibular areas : ▪ Retromylohyoid area – 17%▪ Lingual sulcus – 14%▪ Vestibular sulcus – 13%
Frequency and location of traumatic ulcerations following placement of complete dentures.Int J Prosthodont. 2007 Jul-Aug;20(4):397-401.
Can be used for adjacent areas on
the oral surface of the prosthesis.
Coronoid process against the distobuccal surface of the denture
Bulky buccal contours Teeth placed too far buccally
Loney R. Diagnosing denture pain: principles and practice. J Can Dent Assoc2006;72:137-41
Diagnose speech problems To diagnose tongue contact areas on the
denture palate Instruct the patient to repeat problematic
sounds with the media covering the palate.
Farley DW, Jones JD, Cronin RJ. Palatogram assessment of maxillary complete dentures. J Prosthodont 1998;7:84-90
Adjust the denture with an acrylic bur of appropriate size and shape
Reapply media to ensure that the adjustment has been effective
Removing the media
For cream-type media - use an air syringe to blow off and wipe away.
For elastomeric media Mark the exposed areas The polymerized elastomer catch the
bur and tear or pull away from the denture.
Frequency
After 1 week: 87%
After 2 weeks: 50%
After 3 weeks: 7%
Frequency and location of traumatic ulcerations following placement of complete dentures.Int J Prosthodont. 2007 Jul-Aug;20(4):397-401.
Cheapest is the home-made type media equal quantities of hand lanolin and zinc
oxide powder
3% of the costliest media
Most effective
A comparison of the cost effectiveness of pressure-indicating materials and their ability to detect pressure areas in complete dentures SADJ. 2001 May;56(5):228-32.
Suggestions:
If interpretation is difficult Avoid adjustments until signs and
symptoms appear
Opinion from the patient
SUMMARY
Denture placement - not be the final patient-clinician encounter
Denture adjustments are very important clinical phases of denture fabrication and essential in patient care.
References:
Firtell DN, Arnett WS, Holmes JB. Pressure indicators for removable prosthodontics. J Prosthet Dent 1985;54:226-9.
Greenwood AH, Firtell DN. Pressure indicators-a useful diagnostic aid. Quintessence Int 1985;16:531-3.
Zarb GA, Bolender CL, 12th ed. St. Louis: Mosby; 2003. p. 402-26.
A comparison of the cost effectiveness of pressure-indicating materials and their ability to detect pressure areas in complete dentures SADJ. 2001 May;56(5):228-32
Farley DW, Jones JD, Cronin RJ. Palatogram assessment of maxillary complete dentures. J Prosthodont 1998;7:84-90
Frequency and location of traumatic ulcerations following placement of complete dentures. Int J Prosthodont. 2007 Jul-Aug;20(4):397-401.
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