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Chapter 47 Quiz
Final review
| Question | Answer |
|---|---|
| Which type of baseplate wax is softest? | I |
| What should be done to an impression before pouring? | Use a gentle stream of air to remove excess moisture. |
| Which of the following statements correctly describes the pouring methods used to create the base portion of a dental model? | The inverted-pour method consists of mixing one large mixture of plaster or stone and pouring both portions of the model in a single step. |
| The ______ is the measurement of where the teeth are positioned when the joints are aligned correctly and before the teeth actually come together. | bite record centric relation Both A and C are correct. |
| Which statement is incorrect regarding safety precautions in the laboratory? | This is the appropriate place for eating and drinking in the dental office. |
| After fabrication, when can a self-cured resin custom tray be used? | After 24 hours |
| How should the patient bite when positioning the bite-fork during a face-bow registration? | Slowly |
| Which type of wax is preformed with a thin sheet of aluminum foil between the layers? | Bite wafers |
| How will gypsum material be affected if additional powder is added after mixing has begun? | Weaker |
| A vacuum former is utilized to conform a sheet of which of the following types of resin materials to a diagnostic model? | Thermoplastic |
| 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 |
| When would a light gauge, vacuum-formed resin material be used? | Bleaching trays Provisional coverage Both A and B |
| Which form of gypsum product is used for the creation of dies? | High-strength stone |
| Before constructing a light-cured tray, what would be painted on the model? | Separating medium |
| Which item is used to polish or trim custom trays, provisional coverage, dentures, and indirect restorations? | Dental lathe |
| In minutes, how long should one wait before removing a model from an impression after pouring? | 45 to 60 |
| The first step in making a custom tray is to | place blockout material to fill undercuts in the preliminary cast. |
| How many milliliters of water should be mixed with 100 grams of high-strength dental stone? | 19 to 24 |
| 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. | anatomic; art |
| What causes air bubbles in a model? | Improper pouring of the impression |
| How should a plaster mix not be manipulated? | Complete mix in 30 seconds. |
| What device holds maxillary and mandibular models in an occlusal relationship? | Articulator |
| Which of the following is/are used to prevent a custom impression tray from sitting too deeply when taking the impression? | Spacer stops |
| Which statement regarding infection control in the dental laboratory is accurate? | It is equally as important as when you are with a patient. |
| 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 |
| Which type of dental wax is often used to form a wall or box around a preliminary impression when it is poured up? | Boxing wax |
| Which methods are used to protect against biohazard contamination from impressions? | Disinfecting impressions in the treatment room before bringing them to the laboratory Disinfecting laboratory benches and other contaminated items after use Disinfecting laboratory benches and other contaminated items before use All of the above |
| 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 |
| Which technique listed would be incorrect when pouring an impression? | In large amounts |
| Water should be running through a model trimmer | when trimming. |
| How should light-cured resin tray material be cured? | For 2 minutes |
| When taking a face-bow registration, the vertical indicator rod should be aligned with which oral landmark? | Midline |
| When constructing custom trays, it is best to remove excess material with a _______ after it has cured. | lab knife |
| Light-cured resin can be used to make trays for which types of impressions? | Edentulous Dentulous Partially edentulous All types |
Created by:
alejac0360