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Where woould the dental laboratory be located in a dental office?
In a separate area of the dental office (away from the patient treatment room)
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What specialty practices might have a more extensive laboratory setup?
- pediatric dentistry
- orthodontics
- prosthodontics
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What is an example of a contaminated item in the dental laboratory?
Anuthing brought into the laboratory from the treatment room area (impressions)
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What is required in the laboratory to heat wax or other materials?
heat source (propane or butane)
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What is used to trim stone or plaster model?
model trimmer
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What piece of equipment is used to grind away plaster or stone?
model trimmer
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What piece of equipment does the dentist use to determine centric relation on a diagnostic model?
face bow
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What is the most common wax spatula size used in the laboratory?
#7 wax spatula
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Which appliance is used to construct custom trays for bleaching, mouth guards and positioners for orthodontics?
vacuum former
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What is used to remove air from the mix of plaster or stone and to aid in the flow of material when diagnostic model is poured up?
vibrator
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What is used for many tasks, such as trimming custom impressions trays, adjusting dentures and polishing provisional and inderect restorations?
low-speed laboratory handpiece
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A handheld unit that sprays sand at a high rate of speed, creating etching or pitting on surface area of metals, porcelain, or acrylic?
sandblaster
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What mechanical device is used to hold maxillary and mandibular dental models in a position to aid in reproduction of the mandible in relation to the maxilla?
articulator
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A machine used for cutting or polishing dental appliances?
lathe
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Structural portion of a dental model created from the alginate impression?
Anatomical portion
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Chemical process in which crystals form a structure?
Crystallization
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An accurate replica of the prepared portion of the ttoth used in the laboratory during the fabrication of a cast restoration?
die
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Related to gypsum products and indicating two parts of water to one part of calcium sulfate?
Dihydrate
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Resistance to changes in width, height and lenght?
Dimensionally stable
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Mineral used in the formation of plaster of Paris and Stone?
Gypsum
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Removal of water to become one-half part water to one part of calcium sulfate, forming the powder product of Gypsum?
Hemihydrate
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Machine used for cutting or polishing dental appliances?
Lathe
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Replica of the maxillary and mandibular arches made from an impression?
model
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A molecule that, when combined with other molecules, forms a polymer?
monomer
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Compound of many molecules?
polymer
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mixture of gypsum and water used in the finishing of models?
slurry
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Substance that can evaporate easily and is very explosive?
Volatile
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Double ended instrument used in waxing a pattern, or when working with wax for a partial or full denture?
wax spatula
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Used for mixing of alginate in the teratment area and for mixing of stone or plaster in the laboratory?
Flexible rubber bowl
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What is another term for a dental model?
study cast
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What dental materials are used to make dental models?
Gypsum products
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What are the 3 forms of gypsum?
- model plaster
- dental stone
- high-strenght stone
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What is the water-to-powder ration of plaster?
100g to 45-50ml of water
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When mixing gypsum materials what do you add 1st?
powder to water
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In what are gypsum materials mixed?
Flexible rubber bowl
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Accurate three-dimensional reproduction of the teeth and sorrounding soft tissues of the patients maxillary and mandibular arches?
dental model
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What is used to create a dental model?
alginate
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What are Dental models used for?
- Diagnosis for planning a fixed or removable prosthetic device
- Diagnosis of orthodontic treatment
- Visual presentation of dental treatment
- custom trays
- provisional coverage
- mouth guards
- orthodontics
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What are the differences b/w the 3 gypsum products?
size, shape and porosity of the hemihydrate crystals
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What is a Model plaster commonly refered to?
Plaster of Paris
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What gypsum product requires the greatest quantity of water and is the weakest form of study models?
Model plaster
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For of gypsum usually yellow used when a more durable diagnostic cast is required?
dental stone
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High strenght stone is also known as?
densite or improved dental stone
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Gypsum that make it ideal for creating DIE for use of fabrication of wax pattern with the production of wax, bridges, and indirect restorations?
- High-Strenght Stone
- densite
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What has a significant effect on the setting time abd strenght of the gypsum product?
powder-to-water ratio
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When too little water is used, the mix will dry and provides?
shorter working time
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When too much water is used, the mix will be thin and runny?
- takes longer to set
- weaker model
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What is used to measure the water?
- large syringe
- milliliter-graduated cylinder
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What is used to measure powder?
scale
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What are the 2 parts of the dental model?
- Anatomical portion
- Art portion
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When pouring and impression, where in the maxillary impression do you begin to place the gypsum material?
near the most posterior teeth
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How long should you wait before you separate the model from the impression?
45-60 minutes
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Which of the 2 models do you begin measuring and trimming 1st?
maxillary
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What area on the maxillary and mandibular model is trimmed differently?
- the anterior cut
- mandible round
- maxilla angled
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What should be placed b/w the 2 models when one is trimming them together?
wax bite
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What is the most common way of "pouring up" impressions?
inverted-pour method
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What portion is made up by the anatomical portion?
two thirds
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What portion does the Art portion take from cast?
one third
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What are the primary materials used to construct custom trays?
- self-curing acrylic resin
- light-cured resin
- thermoplastic material
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Of the 3 types of custom trays discussed, which technique uses a more hazardous material in the fabrication of the tray?
Self-curing acrylic resin (liquid monomer)
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Which type of custom tray is made for a vital bleaching procedure?
Vacuum-formed thermoplastic resin
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In which two forms is acrylic resin supplied?
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What is the pusrpose of a spacer?
Placed on the cast to create room in the tray for the impression material
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How are undercuts corrected on a model whena custom tray is prepared?
Fill them with wax or other molding material
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What is used to extend the borders of an impression tray?
utility wax
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Laboratory technicians uses this wax to create a pattern of the inderect restoration on a model?
inlay casting wax
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used for single-tooth inderect restorations and fixed bridges and for casting metal portions of a partial denture?
casting wax
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What type of wax could be used to form a wall around a preliminary impression when pouring it up?
boxing wax
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What type of wax would you use to obtain a patients bite impression?
Bire registration wax
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What is the most common wax used to create a pattern for an inderect restoration?
Inlay casting Wax
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