study models 101 preparation

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Study Models 101Kathy Malone RDH, EFDA, CDA,BS

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Preparation

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Safety First

• Required PPE:–Masks–Goggles–Hair tied back

–NO GLOVES

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Soak

• Soak models in water for 5 minutes before starting to trim to make trimming easier

• Do not immerse the anatomical portion

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The Model Trimmer

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Preparing the Model Trimmer

Water Adjuster

Drain: Make sure the water goes into the sink!!!

Table

Table Adjuster

Hose: Used to rinse the model trimmer

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Preparing the Model Trimmer

• Switch to turn on model trimmer.

• The water will automatically start to flow.

• You must use water during trimming !

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Make sure the base plate is perpendicular to the trimming wheel otherwise all cuts will be

INCORRECT!!!Straight edge is flat against the wheel-CORRECT

Straight edge is on laying evenly against the wheel- INCORRECT / ADJUST

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Always fulcrum arms or hands when using equipment

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Make sure the model fits into the opening of the model trimmer.

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The Lathe with Trimming Bur

Make sure the protective shield is in place when using the lathe

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Remove excess stone to articulate modelsIf model cannot be put together the bite cannot

be established

Excess stone will not let models come together

Use the Trimmer or Buffalo Knife to remove excess

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Take the time to block out tongue area before pouring mandibular arch. This eliminates a lot of work later!!!

The pink area indicates the addition of alginate to block out the tongue area

Notice the flat the tongue area

You can use alginate, “Play-Doh” like material or wax as block out.

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Failing to block out the tongue area of the mandibular impression before pouring will

cause the impression to sink and give you a lot of work later in the trimming process

Impression tore due to impression sinking during the pour

Notice all the extra stone that will need to be removed on the lathe. This will take up a lot of time an effort and jeopardize damaging the model

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The Importance of a Wax Bite

• The wax bite is necessary to establish the patient’s centric occlusion (bite).

• The wax bite protects the teeth during trimming