Week 4 Chapter 47 Quiz _ 118

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Houston Community College *

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Material Science

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Feb 20, 2024

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docx

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What should be done to an impression before pouring? Use a gentle stream of air to remove excess moisture. When constructing ______ with a vacuum former, use a heavier-gauge, flexible plastic that does not require a spacer but does require an attachment for the strap. a mouth guard Which technique listed would be incorrect when pour an impression? In large amounts Which item is used to polish or trim custom trays, provisional coverage, dentures, and indirect restorations? Dental lathe What causes air bubbles in a model? Improper pouring of the impression Water should be running through the model trimmer. when trimming. How should a plaster mix not be manipulated? Complete mix in 30 seconds. Which form of gypsum products is used for the creation of dies? High-strength stone How will gypsum material be affected if additional powder is added after mixing has begun? Weaker Which type of resin is formed into a diagnostic model using heat and a vacuum former? Thermoplastic
A custom impression tray should fit and adapt well to the model and should maintain ____ mm of impression material between itself and the teeth. 3 to 4 When taking a face-bow registration, the vertical indicator rod should be aligned with which oral landmark? Midline The first step in making a custom tray is to: prepare a diagnostic model. Which type of dental wax is used to construct occlusal rims and set denture teeth in the wax-up? Baseplate In minutes, how long should one wait before removing a model from an impression after pouring? 45 to 60 A model consists of the _____ portion, which represents the teeth and tissues of the mouth, and the _____ portion, which forms the base of the cast. anatomical; art Which statement regarding infection control in the dental laboratory is accurate? It is equally as important as when you are with a patient. Which of the following gypsum products has the highest powder-to-water ratio? Model plaster What is one advantage of having laboratory equipment and trained personnel in the dental office? The dentist or private laboratory technician can handle larger cases. A trimmed maxillary model will be _____ at the anterior portion, and the mandibular model will be _____ at the anterior portion. pointed; rounded
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