ResMed Narval CC Professionell-Gebrauchsanweisung Seite 7

Adjusting retention
If needed, you can add or remove some retention from the Narval CC appliance.
When retention is too high.
If you want to relieve retention on specific
areas of the Narval CC appliance, you can
do so at chairside by simply making small
incremental adjustments and checking
the device on the model and patient along
the way.
1
1. Remove material
• Use a scalpel or a stone bur at low speed
to gradually remove excess material from
the inside surface.
• Reduce edges in the interdental spaces
and remove material corresponding to the
side of teeth that have a significant undercut.
2. Polish
• Finish by polishing spots where material
has been removed using a rubber bur for
polishing.
• You can also use a scalpel to remove flash
created by grinding on the appliance.
If you remove material on the band it should
not result in a height of less than 7 .5 mm in
total (including a cap) or a thickness of less
than 1.2 mm.
Always remove localised layers step by step in
small increments. Try the device on the model
and then on the patient.
Removing material on wide or deep surfaces
could weaken the splint. Assess the
transparency of the device to estimate the
remaining thickness. If in doubt, check with
a caliper: the thickness must remain greater
than 1.2 mm. If you remove material, always
check the splints for possible weakness or
breakage before fitting them in the patient's
mouth.
2
When retention is too low.
You can use the following protocol
to increase retention on specific areas
of the splints.
1
1. Heat one side of the relevant quadrant
of the device. Focus the heat on the lingual
and palatal sides of the splints.
Do not heat the internal surfaces or the
edges of the splints. Always use lateral
movements while applying heat with a
flameless heater so as not to burn the splint.
2
2. Squeeze the splint with your fingers to
tighten it a bit.
3
3. Cool completely with compressed air and
replace the splint on the plaster model and
then on the patient to test retention.
If retention is still too low, repeat the process
on the other side of the quadrant.
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