Da311 test review
Sure! Here are flashcards formatted for easy copy and paste. Each question is followed by its answer.
Flashcards for Studying
Q1: What’s a common material that can be used to make a custom provisional (the most common one used)?
A: Acrylic resin (polymethyl methacrylate or bis-acrylic composite).
Q2: What is the preferred method of making a provisional?
A: Indirect method (fabricated outside the mouth to reduce chair time and tissue irritation).
Q3: What types of cement can be used to cement a provisional crown in place?
A: Zinc oxide eugenol (ZOE), polycarboxylate cement, or resin-based temporary cements.
Q4: What at-home instructions would you give a patient who has received provisional coverage before leaving the office?
A:
• Avoid sticky or hard foods.
• Brush and floss gently (slide floss out).
• Contact the office if the provisional comes off.
• Avoid excessive chewing on the treated side.
Q5: When might you use a polycarbonate crown?
A: Used for anterior teeth when a stronger and more aesthetic temporary restoration is needed.
Q6: We might use vacuum-formed resin material if you are making a bleaching tray OR if you need it for provisional coverage.
A: True.
Q7: What can cause air bubbles in a model?
A:
• Improper mixing of plaster or stone.
• Pouring too quickly or without vibration.
• Incomplete spatulation, leading to trapped air.
Q8: What are some examples of proper infection control in the dental lab?
A:
• No eating or drinking.
• Follow manufacturer’s instructions.
• Report all accidents.
• Turn off all equipment before leaving.
• Clean the work area before and after procedures.
• Keep hair pulled back.
Impression & Lab Procedures Flashcards
Q9: What type of tray is required if you are taking an impression using a reversible hydrocolloid material?
A: Perforated tray.
Q10: Why might we take a preliminary impression? To make what? (Multiple answers)
A:
• Diagnostic models.
• Custom trays.
• Provisional restorations.
• Orthodontic appliances.
Q11: If your water temp is hot when you are mixing alginate, what will that do to the setting time?
A: Hot water speeds up the setting time.
Q12: Automix system for elastomeric impression materials, if you are using an extruder gun, the cartridge that is inserted has a base and a catalyst.
A: True.
Q13: How would you disinfect an impression after it is taken?
A: Rinse with water, spray with EPA-approved disinfectant, let it sit for the recommended contact time, then rinse and store.
Q14: If you are mixing plaster, how is it mixed (time frames, etc.)?
A:
• Add powder to water.
• Mix for 1 minute.
• Use a vibrator to remove air bubbles.
Q15: What does the dental lathe do?
A: Used to trim and polish custom trays, dentures, and other dental prosthetics.
Q16: What does the dental vibrator do?
A: Removes air bubbles from plaster or stone and helps material flow evenly into the model.
Q17: What does an articulator do?
A: Holds the mandibular and maxillary models in a position to simulate the patient’s bite.
Q18: What impression will show the occlusal relationship of the upper and lower teeth?
A: Bite registration.
Bite Registration & Provisional Coverage Flashcards
Q19: What type of material is commonly used when taking a bite registration?
A: Bite registration wax or polyvinyl siloxane (PVS).
Q20: What is the horseshoe-shaped wax with aluminum foil in it used for?
A: Used for a bite registration.
Q21: What is baseplate wax commonly used for?
A: Records occlusal rims for the initial denture form.
Q22: If you need to make a custom tray for a patient, what is the very first thing that you need to do?
A: Take a preliminary impression.
Q23: If you’re going to take a bite registration on a patient, what instructions would you give them?
A:
• Close gently into their natural bite.
• Stay still while the material sets.
• Breathe normally through the nose.
Q24: Know the different types of provisional coverage.
A:
• Custom provisional coverage – mostly used for crowns and bridges.
• Prefabricated provisional – used for single-unit teeth, such as shell-like crowns.Here are the answers to the questions, followed by flashcards for easy studying.
Answers to Questions
1. Study models consist of 2 portions: the anatomical portion and the art portion. What is the art portion?
• The base.
2. What is imbibition?
• Absorption of water, causing an object to swell.
3. When should alginate impressions be poured (what time frame)?
• Alginate should be poured within an hour of taking the impression.
4. How long should you wait before removing a model from an impression after pouring?
• Around 45 minutes.
5. How would you remove an alginate impression from the mouth?
• Use a quick snap-out motion to avoid distortion.
6. What is a common irreversible hydrocolloid that we use?
• Alginate.
7. What is something that you can do to help a patient who has a bad gag reflex when taking an impression (there are a few)?
• Use fast-set material.
• Tell the patient to breathe through their nose.
• Sit the patient upright.
8. What are some things you can do to adjust or alter the setting time of alginate?
• Use colder water to slow setting time, warmer water to speed it up.
9. What is a type of elastomeric impression material that has very high viscosity?
• Putty impression material.
10. What type of impression material is used for final impressions?
• Stone.
11. What is syneresis?
• The loss of water, which causes shrinkage.
12. What are the different impression trays and which portions of the mouth do they cover?
• Quadrant tray (one side of the mouth).
• Section tray (anterior teeth).
• Full arch tray (entire upper or lower arch).
13. What is the gypsum material that we use for creating dies?
• Type IV dental stone (also called die stone).
14. When taking an upper impression, in which area of the mouth should the tray be seated first?
• The posterior (back) teeth.
15. Know that the impression is the negative reproduction of the mouth and the model created is the positive reproduction.
• True.
16. If you’re helping the dentist take an elastomeric impression, know that the light body material would be mixed first and then the heavy body while the light body is being applied.
• True.
17. When you’re pouring an impression, add small increments of stone or plaster at a time.
• True.
Flashcards for Studying
Q1: What is the art portion of a study model?
A: The base.
Q2: What is imbibition?
A: Absorption of water, causing an object to swell.
Q3: When should alginate impressions be poured?
A: Within an hour of taking the impression.
Q4: How long should you wait before removing a model from an impression after pouring?
A: Around 45 minutes.
Q5: How do you remove an alginate impression from the mouth?
A: Use a quick snap-out motion to avoid distortion.
Q6: What is a common irreversible hydrocolloid used in dentistry?
A: Alginate.
Q7: How can you help a patient with a bad gag reflex during an impression?
A: Use fast-set material, tell them to breathe through their nose, and sit them upright.
Q8: How can you adjust or alter the setting time of alginate?
A: Use colder water to slow setting time, warmer water to speed it up.
Q9: What type of elastomeric impression material has very high viscosity?
A: Putty impression material.
Q10: What type of impression material is used for final impressions?
A: Stone.
Q11: What is syneresis?
A: The loss of water, which causes shrinkage.
Q12: What are the different types of impression trays and what do they cover?
A:
• Quadrant tray – one side of the mouth.
• Section tray – anterior teeth.
• Full arch tray – entire upper or lower arch.
Q13: What is the gypsum material used for creating dies?
A: Type IV dental stone (die stone).
Q14: When taking an upper impression, which area of the mouth should the tray be seated first?
A: The posterior (back) teeth.
Q15: What is the relationship between impressions and models?
A: The impression is the negative reproduction, and the model is the positive reproduction.
Q16: In elastomeric impressions, which material is mixed first?
A: The light body material is mixed first, followed by the heavy body while the light body is applied.
Q17: How should stone or plaster be added when pouring an impression?
A: Add small increments at a time to avoid air bubbles.
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