Questions and Answers
Which is an advantage of an automix unit system for impressions? (Select all that apply)
Final impressions are taken by the:
dentist
What type of impression tray is required with reversible hydrocolloid impressions?
Water-cooled
The length or depth of the alginate impression tray borders can be extended by adding _____ to the tray.
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Preliminary impressions are used to make: (Select all that apply)
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An impression is a _____ reproduction of teeth and surrounding oral tissues, and the model created from the impression is a _____ reproduction of the structures.
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When taking a wax bite registration, the patient is directed to:
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Impression inspection and evaluation include: (Select all that apply)
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The three classifications of impressions in dentistry are:
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If an alginate impression is stored in water or in a soaked paper towel, the alginate will absorb the additional water and expand. This property is called:
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Alginate material not setting or setting too rapidly may be the result of: (Select all that apply)
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Which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material?
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Criteria for an acceptable alginate impression include all of the following except:
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The _____ portion of the maxillary tray should be seated in the mouth first.
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The irreversible hydrocolloid material used most widely for preliminary impressions is:
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A preliminary impression would be used for:
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The three curing stages are:
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Which of the four types of elastomeric materials has the best dimensional stability?
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Elastomeric materials use an automix system; what does the extruder gun consist of?
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A(n) _____ impression material is used when an extremely accurate final impression is essential.
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If a more durable impression material is needed for bite registration, _____ may be selected.
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Alginate impression material can: (Select all that apply)
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One of the most popular impression materials used for bite registration is:
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Putting utility/rope wax on maxillary alginate trays will: (Select all that apply)
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Custom impression trays:
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Study Notes
Advantages of Automix Units
- Automix units save materials, increase productivity, and reduce time spent on infection control.
- All these factors collectively offer significant advantages.
Final Impressions
- Final impressions are primarily taken by the dentist.
Reversible Hydrocolloid Impressions
- A water-cooled impression tray is essential for reversible hydrocolloid impressions.
Extending Impression Tray Borders
- The length or depth of alginate impression tray borders can be extended using utility wax.
Purpose of Preliminary Impressions
- Preliminary impressions are utilized to create diagnostic models, provisional coverage, and orthodontic appliances.
Impression Types
- An impression serves as a negative reproduction of teeth and surrounding oral tissues, while the resulting model is a positive reproduction.
Wax Bite Registration
- During wax bite registration, patients should close normally and gently.
Impression Evaluation Criteria
- Criteria for inspecting impressions include the presence of anatomical features, sharp detail, and a surface free of voids.
Classifications of Impressions
- Impressions in dentistry are classified into three types: preliminary, final, and occlusal or bite registration.
Alginate Impression Properties
- Alginate can absorb additional water when stored in wet conditions, a phenomenon known as imbibition.
Issues with Alginate Material
- Problems with alginate material not setting properly or setting too quickly may stem from expiration, humidity, or improper storage.
Altering Alginate Setting Time
- The setting time of alginate irreversible hydrocolloid can be adjusted by changing the water temperature.
Acceptable Criteria for Alginate Impressions
- Acceptable alginate impressions should not lack detail regarding frena and tuberosities.
Maxillary Tray Insertion
- The posterior section of the maxillary tray should be seated in the mouth first during the impression process.
Common Impression Material
- Alginate is the most widely used irreversible hydrocolloid material for preliminary impressions.
Role of Preliminary Impressions
- Preliminary impressions are instrumental in crafting custom trays.
Curing Stages
- The curing process of impression materials consists of three stages: initial set, final set, and final cure.
Elastomeric Material Stability
- Among the elastomeric materials, polysiloxane exhibits the best dimensional stability.
Automix System Components
- The extruder gun for elastomeric materials comprises a tube of catalyst and a base with the same viscosity.
Highly Accurate Final Impressions
- An elastomeric impression material is recommended when precision is critical for final impressions.
Durable Bite Registration Materials
- For durable bite registration, zinc oxide-eugenol (ZOE) may be selected as the material.
Properties of Alginate Impression Material
- Alginate can change color as it sets, be either normal or fast-setting, and may come flavored.
Popular Bite Registration Material
- Polysiloxane ranks as one of the most favored materials for bite registration.
Utility/Rope Wax on Alginate Trays
- Applying utility/rope wax to maxillary alginate trays maximizes anatomical coverage and modifies the tray for high palates, without permanently altering it.
Construction of Custom Impression Trays
- Custom impression trays can be constructed from resin materials.
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Description
Test your knowledge with this quiz based on Chapter 46 of dental impressions. It covers key concepts such as automix unit systems, final impressions, and the specific trays required for hydrocolloid impressions. Perfect for students in dental programs or professionals seeking to refresh their knowledge.
