Dental Materials Midterm Review Flashcards
What is the anatomical portion of a dental model?
structural portion of a dental model created from alginate impressions
What is an articulator?
dental lab device that stimulates the movement of the mandible and temporomandibular joint when the dental cast is attached to it
What is a die?
accurate replica of the prepared portion of tooth used in lab for fabrication of a cast restoration
what is a dihydrate?
related to gypsum products indicating 2 parts water to 1 part calcium sulfate
What is dimensionally (material characteristic)?
dental material that retains its original dimension when exposed to change in temp and humidity
what is a face bow?
portion of articulator used to transfer the relationship of the maxillary arch and temporomandibular joint to dental cast
What is gypsum chemically known as? what is it used in
chemically known as calcium sulfate dihydrate used in formation of plater of paris and dental stone
What is a hemihydrate?
when gypsum is heated, it loses water and converts to calcium sulfate, forming powder product of gypsum
what is homogenous?
having a uniform quality and consistency throughout
What is a monomer?
molecule that when combined with other molecules forms a polymer
what is nuclei crystallization?
chemical process in the setting of dental stone and plater in which a cluster of crystals interlink giving strength and ridgity
what is a polymer?
chemical compound consisting of like units bonded together
what is a slurry?
mixture of gypsum and water used in finishing of models
what is volatile?
substance that can evaporate easily and is very explosive
What is a model trimmer and what is its function?
machine used to trim stone or plaster using abrasive grinding wheels
used to grind away excess plaster and stone
- stream of water to control dust
What is a vacuum former and what is its function?
used to construct custom trays (bleaching trays) the upper part of the unit is the heating element that softens the plastic and the bottom has holes that act as the vacuum
what is the vibrator?
used to remove air from the mix of plaster or stone
what is the laboratory hand piece used for ?
used to trim custom impression, adjusting dentures and polishing provisional restorations
what is the sandblaster used for?
sprays sand at high speeds to to create an etching or pitting on surfaces this adds added retention for repairs
What is the dental lathe?
used to trim and polish custom trays
What are wax spatulas?
double ended instrument used in waxing a pattering or when working with wax on a partial or full denture
what is the most common wax spatuala
number 7