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Boucher: Based On Selective-Pressure Technique

The document discusses different techniques for spacer design in complete denture impressions advocated by various authors. Boucher advocated a 1 mm base-plate wax covering the mandibular ridge except the buccal shelf and retromolar pad. Morrow, Rudd, and Rhoads recommend blocking out undercut areas with wax and adapting a 2 mm spacer short of the tray border with three equidistant tissue stops. Sharry recommends a layer of base-plate wax over the entire outlined tray area with four 2 mm wide tissue stops and a vent hole. Bernard and Levin recommend a 2 mm pink wax layer on softer tissues with wax spacer all around except the posterior palate.

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6K views1 page

Boucher: Based On Selective-Pressure Technique

The document discusses different techniques for spacer design in complete denture impressions advocated by various authors. Boucher advocated a 1 mm base-plate wax covering the mandibular ridge except the buccal shelf and retromolar pad. Morrow, Rudd, and Rhoads recommend blocking out undercut areas with wax and adapting a 2 mm spacer short of the tray border with three equidistant tissue stops. Sharry recommends a layer of base-plate wax over the entire outlined tray area with four 2 mm wide tissue stops and a vent hole. Bernard and Levin recommend a 2 mm pink wax layer on softer tissues with wax spacer all around except the posterior palate.

Uploaded by

eili1
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Spacer design Maxillary ridge Mandibular ridge

Boucher, based on selective-pressure technique, and 1 mm thick base-plate


advocated the placement of 1 mm base- waxcovers mandibular ridge except buccal shelf
plate wax on the entire basal seat area area and retromolar pad
except posterior palatal seal (PPS) area.

Morrow, Rudd, and Rhoads, based on minimal-pressure technique, recommend blocking out undercut areas with wax and then
adapting a full wax spacer 2 mm short of the resin special tray border all over. Then they
recommend placement of three tissue stops (4 × 4 mm) equidistant from each other

Sharry, based on minimal-pressure technique, recommends adaptation of a layer of base-plate wax over
the whole area outlined for tray (even in PPS area). He recommends the placement of four tissue
stops (2 mm in width located in molar and cuspid regions which should extend from palatal aspect
of the ridge to the mucobuccal fold) and one vent hole in the incisive papilla region before making
the final impression with the metallic oxide impression material

Bernard and Levin based on selective pressure technique, recommends a layer of pink base-plate wax (about 2 mm
thick) attached to the areas of the cast that usually have the areas of softer tissues; he
recommends the placement of wax spacer all around, except the posterior part of the palate,
which according to him are at high angles to the occlusal forces. Not employed as midpalatine
raphe, not relieved, and exposed palatal area acts as a stopper

Halperin Recommended the “custom tray” with peripheral relief. He suggested the custom trays be provided
with 1 mm thick wax relief over the peripheral extensions and buccal slope regions of tray
including PPS region and that the custom tray be in intimate contact with basal seat areas. This
provides the internal finish line that forms a butt joint of the compound to the tray after border
molding is completed. No secondary wash impression is needed as tray surface and border-
molded areas acts as final impression surface. A master cast is directly poured into border-
molded trays without using wash impression

Mac Gregor based on selective pressure technique, recommends placement of a sheet of metal foil in the
region of incisive papilla and midpalatine raphe.

Neill recommends the adaptation of 0.9 mm casing wax all over except PPS area

Shetty a thin sheet of wax (0.4 mm major connector wax [Renfert, Germany]) is required to be placed in
all areas except the PPS area, as this area needs to be compressed during the border-molding
procedures. A 1.5 mm thick layer of modelling wax is applied on top of the already adapted wax
sheet. The modelling wax is removed in the region of the crest of the alveolar ridge and the
horizontal palate, as these are stress-bearing areas

based on selective-pressure technique; the spacer placed on relieving areas and the exposed
areas acts as stoppers. t-spacer covers the anterior residual alveolar ridge in maxilla when it is
resorbed and flabby. it also covers the prominent incisive papilla, rugae and midpalatine raphe,
and the exposed areas act as stoppers.

From: A Clinical Review of Spacer Design for Conventional Complete Denture Ashish R Jain and Dhanraj M
Ala’a Otaibi

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