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ch46 study
| Term | Definition |
|---|---|
| Elastomeric materials are intended for what type of impression? | Final & bite registration |
| ___________ is the mateiral of choice in dentistry for preliminary impressions. | alginate |
| A preliminary impression is _______________ before being transported to the lab for pouring up | rinsed, disinfected, wrapped in a moist paper towel and placed in a sealed bag |
| Where would reversible hydrocolloid material be placed prior to taking the impression? | conditioning bath |
| An impression would be considered a _______________. | negative reproduction |
| Which type of stock tray would be selected and prepared to cover half of an arch? | quadrant |
| How is an elastomeric material supplied? | paste cartridge putty any of the above |
| _____________ would be used to extend the length of the tray to accommodate third molars. | utility wax |
| Which of the following criteria would indicate an acceptable impression? | -sharp anatomic detail - complete peripheral roll -impression should clearly show all teeth present -the impression should be centered |
| ____________ is the process of using the fingers to achieve a close adaptation of the edges of an impression. | border molding |
| The organic substance of hydrocolloid material is ______________. | seaweed |
| What additional method can be used to mix final impression material instead of using an extruder? | spatula and pad |
| How is the light-body impression material applied during the final impression procedure? | extruder with a tip |
| ________________ is a gelatin-type material derived from seaweed. | agar |
| Irreversible hydrocolloid material is also referred to as _______________ | alginate |
| Which type of impression tray allows the impression material to mechanically lock on? | perforated |
| Which type of tray is constructed to fit the mouth of a specific patient? | custom |
| What type of tray is most commonly selected when zinc oxide-eugenol bite registration material is used? | gauze |
| Baseplate wax is _______________ before being placed in the patient’s mouth for a bite registration. | warmed |
| ____________ is the loss of water, which causes shrinkage. | syneresis |
| Why would you select a fast-set alginate when taking a preliminary impression? | the patient has a gag reflex |
| The powder/water ratio for a maxillary preliminary impression is ____________. | 3 scoops of powder to 3 measures of water |
| A(n) ____________________impression material has elastic properties and is made from rubber. | elastomeric |
| To have something __________________is to have it centered, such as the maxillary teeth centered over the mandibular teeth. | centric |
| A ___________ is a reproduction of someone's bite with the use of wax or elastomeric material. | occlusal registration |
| _______________ is the material universally used for taking a bite registration. | baseplate wax |
| ____________ means water. | hydro |
| When taking an impression, how would the dental assistant know what size tray to use? | by evaluating the patient's mouth and then trying in the tray to check for appropriate fit |
| A(n)_____________ is a substance that modifies or increases the rate of a chemical reaction. | catalyst |
| Of the three classifications of impressions, which of these could be an expanded function for the certified dental assistant? | preliminary & bite registration |
| How is irreversible hydrocolloid material mixed? | in a rubber bowl |
| The dentist asks you to take maxillary and mandibular impressions on the next patient for the fabrication of bleaching trays. What material will you be using? | alginate |
| A _________ is a gel or sol substance with its particles suspended in a water-based medium. | colloid |
| ______________ causes a material to transform a material from one physical state to another. | hysteresis |
| ________________ is the absorption of water, which causes and object to swell. | imbibition |
| ___________ describes a property of fluids with a high resistance to flow. | viscosity |
| ____________ is a way of bringing a material to a desired temperature and consistency. | tempering |
| Another name for polysulfide is ________________. | rubber base |
| Of the three classifications of impressions, which would be used by the dental lab tech for determining occlusal relationship? | bite registration |
| Which viscosity of a final impression material is applied first to the prepared tooth or teeth? | light body |
| While the dentist is dispensing the syringe material around the prepared tooth, what should the dental assistant be doing during a final impression procedure? | readying the tray with the heavy-body material |
| If the patient has a severe gag reflex, it is generally best to take the ___________ first. | mandibular |
| A foundation or basic ingredient of a material is the _________________. | base |
Created by:
ARIGON5248