Trimming Diagnostic Cast Models with correct answers
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Course
Trimming Diagnostic Cast Models
Institution
Trimming Diagnostic Cast Models
Step 1 correct answersAfter the heat from the setting process dissipates completely (approximately 45 minutes), trim any excess gypsum material from the outside of the tray with a lab knife and carefully separate the cast from the impression. Do not force the tray, or teeth may be broken during the...
Step 1 correct answersAfter the heat from the setting process dissipates completely (approximately 45
minutes), trim any excess gypsum material from the outside of the tray with a lab knife and carefully
separate the cast from the impression. Do not force the tray, or teeth may be broken during the process.
The knife should be placed between the gypsum material and the tray to gently pry it loose all the way
around the tray before separating the tray from the model.
Step 2 correct answersSoak stone casts in room temperature water for at least 30 minutes before
trimming.
Step 3 correct answersMark the maxillary cast with trimming marks between the central incisors, at the
center of the cuspids, and posterior of the tuberosities. The mandibular cast will be trimmed to the
shape of the maxillary cast.
Step 4 correct answersPut on eye protection and turn on the water to the model trimmer. Adjust water
as needed to keep the wheel wet and turn on the model trimmer motor. Begin trimming the maxillary
cast by placing the model onto the trimmer table and cut just enough on the posterior to create a flat
surface. But to approximately 1/4 inch behind the maxillary tuberosities.
Step 5 correct answersSet the maxillary model on the counter to determine how even the base is and
then place the model on the trimmer with the base of the model against the blade and put pressure
where needed to even the base on the maxillary model. Make sure that when the anatomic portion of
the model is placed on the table or counter the art portion is parallel with the countertop.
Step 6 correct answersCut the sides of the maillary model using the cuspid as a guide so that the cut is
parallel to the alveolar ridge, flared at the molar areas, and approximately 1/4 inch wide.
Step 7 correct answersTurn the model using the lateral incisors and the line between the central incisors
as a guide and trim until there is a point at the canine eminence. Do the same on the next front cut,
watching as you create a point between the cental incisors and point at the cuspid.
Step 8 correct answersTrim the posterior of the mandibular model to at least 1/4 inch beyond the
retromolar pads, then trim to even the base. Whichever model has the longest arch, the maxillary or
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