Study Guide Questions

Primary Impressions

1. What is the rational of performing primary impression procedure?
2. Why is it important to follow the manufacturer’s recommended water-powder ratio when mixing
   alginate impression material?
   What happens when there is more water? Less water? What other factors affect the consistency
   of the alginate during mixing?
3. What is the difference between working time and setting time of alginate impression material?
4. Is it a good practice to try and fit the impression tray in the arches prior to impression making?
5. As the operator, what is the importance of holding the impression tray stable in arches as the
   alginate material is setting?

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Diagnostic Casts

1. When pouring the primary impression with the microstone®, what is the advantage of using a
   vacuum-mixer over hand spatulation in the plaster bowl?
2. Why is it important to use a vibrator when pouring the primary impression with the microstone?
3. Diagnostic cast should have adequate base, what is the 2-pour technique?
4. Aside from bubbles and blebs, what are the common errors seen in diagnostic cast?
5. Why is it important to trim and refine the diagnostic cast?

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Interocclusal Record

1. What is the purpose of an interocclusal record?
2. Aside from using VPS interocclusal record material, what other material can we use for this purpose?
3. Differentiate centric relation from maximum intercuspal position.
4. When can you hand articulate the maxillary and mandibular casts?
5. Why do we have to trim the interocclusal record to “cusp tips only?”

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Facebow Transfer

1. What is Facebow transfer?
2. What is the purpose of Facebow record when mounting maxillary arch?
3. What are the 3 reference points in Facebow recording?
4. What is the spatial relation affected by the nasion relator?
   Superior-inferior? Medio-lateral? Or Anterior-posterior?
5. Does Facebow record determine the position of the mandibular arch?

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Mounting Casts

1. Describe the technique in stabilizing the mandibular cast during mounting.
2. What is orientation groove?
3. What purpose does orientation groove serve?
4. Describe remounting procedure?
5. Site examples of situations when remounting the casts are necessary.

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Custom Tray

1. What is the purpose of a custom tray?
2. Describe the steps of fabricating a custom tray?
3. What is the wax relief / spacer for?
4. What are impression tray stops for?
5. Why should the handle be oriented at 45 degree angle?
   What are the clinical implications if the tray handle is in a wrong angulation?

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Custom Incisal Guide Table

1. Explain the rational for doing a custom Incisal guide table.
2. Differentiate custom guide table from the mechanical guide table.
3. List the materials and instruments needed for fabrication.
4. What jaw movements are recorded in the custom Incisal guide table?
5. What are the different types of occlusal scheme that can be recorded by the custom Incisal guide table?

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