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2. The denture is placed on the gauge
base with the anterior teeth facing
the vertical arm.
3. Pushing down on the black stylus
handle will allow the stylus point to
locate the incisive papilla depres-
sion in the acrylic base.
The vertical scale below the stylus
handle is read first (X mm) and then a
horizontal reading is taken (Y mm) on
the base where the incisal edge of the
teeth rest. A reading of 10X/8Y mm
indicates that the incisal edge of the
central teeth are 10mm vertical and
8mm horizontal to the incisive papilla.
If vertical space is not satisfactory,
see "Restoring Proper VDO In A New
Denture."
In the case of the lower den-
ture, however, the ridge is subject to
continued resorption. A reline-type
impression should be taken inside the
fitting surface of the denture and this
will
compensate
(Alternatively, replace the gap
with some Triad
Material and take a new Alma
reading.) The Alma Gauge can now
Indicator stylus
handle
Vertical (X)
measurement
Base with
shield
Horizontal (Y)
measurement
for
any
gap.
®
®
VLC Reline
be used confidently in the knowledge
that the recordings taken do relate to
the current shape of the lower ridge.
If a 2mm overbite relation-
ship is required, this has to be in-
corporated
in the lower
rim prescrip-
tion. If the
d e s i r e d
lower incisal
edge
posi-
tion is e.g.
10X/4Y, the
bite rim is
requested at
2mm less on the vertical e.g. 8X/4Y.
The try-in will then be 10X/4Y.
II. Use of Alma Gauge Shields
The Alma Gauge shields have
been designed in order to improve the
information that is passed between the
dentist and the technician, and also to
reduce the risk of cross infection.
A shield is placed on the base of
the Alma Gauge before a denture is
put into position. Two readings are
then taken from the scales, as noted
earlier.
A marker pen is then used to draw
around the denture onto the shield to
record the position of all the teeth
around the arch. To adjust the shape of
the bite rim, or the position of the
teeth, simply revise the drawing on the
shield.
The shield can then be removed
from the gauge and sent to the labo-
ratory along with the impressions and
other information.
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