3 - Boxing, pouring, & trimming casts Questions with complete solution 2024/2025 3 - Boxing, pouring, & trimming casts
why do we box the impressions?
how do we bend handle?
to preserve peripheral rolls that we've worked so diligently to create
- bend handles of maxillary final impression ...
3 - Boxing, pouring, & trimming casts
why do we box the impressions?
how do we bend handle?
to preserve peripheral rolls that we've worked so diligently to create
- bend handles of maxillary final impression tray against the palatal surface or
back to the MFP (mean foundation plane) is parallel to the bench top
what do we do to form the matrixes around each impression?
50-50 mixture of dental plaster and pumice flour, with a 1:1:1 water ratio
how do we want to seat the maxillary tray/impression into the pumice/plaster
mixture?
center it and push all the way down, allowing the mixture to lay in the same
plane as the peripheral rolls
- you can either work the mixture right up to the top of the peripheral rolls, or
work mixture up toward the top of the rolls but only to the point where there is
still 5mm of peripheral rolls above the crest of the mixture
how much pumice/plaster do you use for maxilla? for mandible?
, maxilla: one 6oz cup each of plaster and pumice. then a little less than 1 cup
of 6oz water
mandible: 1.5 6oz cup each of plaster and pumice. then a little more than 1
cup of 6oz water (a little less than 1.5 cup)
what are the three points of plane of MFP for the mandible
anterior: midline crest of edentulous mandibular ridge
posterior: areas of the left/right ascending rami of mandible
T/F the mandibular MFP is NOT from the anterior crest of the ridge to the
retromolar pads
TRUE
how long before the pumice/cast mix sets?
5 min
what dimensions do you trim the matrix to?
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