Week 4 Flashcards
Dissipate
To cause something to scatter, or become dispersed, and gradually disappear.
Exothermic
Characterized by the release of heat from a chemical reaction.
Luting agent
Cement-type substance used to seal a surface.
Retard
To slow down a process.
Spatulate
To mix using a spatula-type instrument.
Anatomic portion
The structural portion of a dental model created from the alginate impression.
Articulator
Dental laboratory device that simulates mandibular and temporomandibular joint movement when models of the dental arches are attached to it.
Crystallization
Chemical process in which
crystals form a structure.
Die
An accurate replica of the prepared portion of a tooth used in the laboratory during the fabrication of a cast restoration.
Dihydrate
Relating to gypsum products and indicating two parts of water to one part of calcium sulfate.
Dimensionally stable
Resistant to changes in width, height, and length.
Facebow
Portion of articulator used to measure the upper teeth as compared with the temporomandibular joint.
Gypsum
Mineral used in the formation of plaster of Paris and stone.
Hemihydrate
Removal of one-half part water to one part of calcium sulfate, forming the powder product of gypsum.
Homogenous
Having a uniform quality and consistency throughout.
Lathe
Machine used for cutting or polishing dental appliances.
Model
Replica of the maxillary and mandibular arches made from an impression.
Monomer
A molecule that, when combined with other molecules, forms a polymer.
Polymer
Compound of many molecules.
Slurry
Mixture of gypsum and water used in the finishing of models.
Volatile
Substance that can evaporate easily and is very explosive.
Arch wire
A contoured metal wire that provides force when teeth are guided in movement for orthodontics.
Auxiliary
Attachments located on brackets and
bands that hold arch wires and elastics.
Band
Stainless steel ring attached to molars to hold the arch wire and auxiliaries for orthodontics.
Braces
Another term for fixed orthodontic appliances.
Bracket
small device bonded to teeth to hold the arch wire to the teeth.
cephalometric radiograph
An extra oral radiograph of the bones and tissues of the head
Crossbite
Condition that occurs when a tooth is not properly aligned with
its opposing tooth.
Crowding
Condition that occurs when teeth are not properly aligned within
the arch.
Dentofacial
Structures that include the teeth, jaws, and surrounding facial
bones.
Distoclusion
class ll malocclusion in which the mesiobuccal cusp of the maxillary first molar occludes (by more than
mandibular first molar.
the width of a premolar) mesial to the mesiobuccal groove of the
Fetal molding
Pressure applied to the jaw, causing a distortion.
Headgear
An external orthodontic appliance that is used to control growth and tooth movement.
Ligature
Light wire used to hold the arch wire in its bracket.
Open bite
lack of vertical overlap of the maxillary incisors, creating an opening of the anterior teeth.
Overbite
Increased vertical overlap of the maxilary incisors.
Overjet
Excessive protrusion of the maxillary incisors.
Positioner
An appliance used to retain teeth in their desired postion.
Retainer
appliance used for maintaining the positions of the teeth and jaws after orthodontic treatment.
Separator
device made from wire or elastic and used to separate molars before fitting and placement of orthodontic bands.
What variable affects the addition or loss of water in a dental cement?
Humidity
What ingredient in the powder of glass ionomer cement helps to Inhibit recurrent decay?
Fluoride
Can resin cements be used under metal castings?
Yes
In the composite resin cementation procedure, what step is important to complete on the tooth surface before cementation of the material?
The tooth must be free of
plaque and debris and must be
prepared by etching.
Or by treatment with a bonding system
How should polycarboxylate cement appear after the miXing process?
Somewhat thick
Glossy and shiny surface
What is the main component in the liquid form of zinc phosphate cement?
50%
phosphoric acid in water
How do you dissipate the heat from zinc phosphate during the mixing process?
The cement must be spatulated over a wide are of a cool, dry, thick glass slab
What size of powder increment is first brought into the liquid of zinc phosphate during mixing?
Smallest increment of powder
Do you “fill” or “line” a crown with permanent cement?
Line
What age groups seek orthodontic care?
All age groups - pediatric
Give a type of genetic cause for malocclusion.
Small jaw one parent- large teeth other parent
Missing tooth inherited
What term is used for abnormal occlusion?
Malocclusion
What tooth is used to determine a person’s occlusion?
First molar
If a tooth is not properly lined up with its opposing tooth, it is said to be in
Crossbite
If a person occludes and you cannot see the mandibular anterior teeth, what is the patient’s malalignment?
Overbite
What two positions does the orthodontist evaluate for facial symmetry?
Frontal and profile
What type of radiograph is used to review the anatomic base for malocclusion?
Extra oral radiograph - cephalometric
What instrument is used to seat a molar band?
Band plugger
To prepare for the placement of orthodontic bands, what procedure is completed to wedge teeth apart
Separator
Are brackets cemented or bonded to a tooth?
Bonded
How can hard foods possibly harm braces?
Loosen bands, bend and occasionally break arch wires
How can a patient make flossing easier with braces?
Using a floss threader
When a patient’s braces come off, does this mean that treatment is over? Why not?
No. To achieve long term results, orthodontic control of tooth position and occlusal relationships must be withdrawn gradually not abruptly
Give an example of a retention appliance.
Retainer
Positioner
Where would the dental laboratory be located in a dental office?
Separate area away from the patient treatment area
What specialty practices might have a more extensive laboratory setup?
Pediatric dentistry
Orthodontics
Fixed and removable prosthodontics
What is an example of a contaminated item in the dental laboratory?
Items brought from inside the area
What piece of equipment is used to grind away plaster or stone?
Model trimmer
What is the most common wax spatula size used in the laboratory?
7 wax spatula
What is another term for a dental model?
Study casts
What dental materials are used to make dental models?
Gypsum products
What are the three forms of gypsum?
Model plaster
Dental stone
High strength stone
What is the water-to-powder (g/ml) ratio of plaster?
100g/45 to 50 ml
When mixing gypsum materials, do you add the
“powder to the water or the “water to the powder?
Powder to water
What are gypsum materials mixed in?
Rubber mixing bowl
What are the two parts of a dental model?
Anatomical portion
Art portion
When pouring an impression, where in the maxillary impression do you begin to place the gypsum material?
Posterior area of the impression
How long should you wait before you separate the model from the impression?
45 to 60 minutes
Which of the two models (maxillary or mandibular)
do you begin measuring and trimming first?
Maxillary
What should be placed between the two models when one is trimming them together?
Wax bite
Of the three types of custom trays discussed, which technique uses a more hazardous material?
Acrylic resin tray
Which type of custom tray is made for a vital bleaching procedure?
Vital bleaching tray
Which type of material is used for a vacuum-formed custom tray?
Thermoplastic resin material
What is the purpose of a spacer?
To create room in the tray for the impression material
What type of wax is used to form a wall around a preliminary impression when pouring it up?
Boxing wax
To extend an impression tray, what type of wax would you use?
Utility wax
What type of wax would you use to obtain a patient’s bite impression?
Impression wax
What is the most common wax used to create a pattern for an indirect restoration?
Inlay casting wax
What piece of equipment does the dentist use to determine centric relation on a diagnostic model?
Face bow
What area on the maxillary and mandibular model is trimmed differently?
In which two forms is acrylic resin supplied?
How are undercuts corrected on a model when preparing a custom tray?
Amalgam tray set up
Mouth mirror
Explorer
Cotton pliers
Spoon excavator
Amalgam carrier
Condenser
Discoid/cleoid carver
Hollenback carver
Football/ball burnisher
Amalgam tray accessories
Dycal placing
Cement spatula
Universal matrix
Retainer, band
Wedges
Floss
Amalgam well
Amalgam capsule
Bonding agents
Light cured
Auto cured
Flowable composite
Runny version of composite and is sometimes used to line the inside of the preparation
Composite
Tooth colored filling material
Tofflemire matrix band holder
Used to hold the matrix band tightly around the tooth
MO
DO
Sectional matrix band
Ensure tighter contact between the teeth after the composite restoration is completed
