Looks like no one added any tags here yet for you.
The largest component of an amalgam alloy is:
silver
The process of physically mixing an amalgam is known as:
trituration
match the cavity prep classification with the surface area:
Class I
Class II
Class III
Class IV
Class V
I: Caries in pits & Fissures.
II: Two or more posterior surfaces.
III: Interproximal surface of anterior.
IV: Interproximal surfaces and incisal edges of anteriors.
V: Cervical third, facial or lingual.
If amalgam is carved after it has started to set, what will occur?
chipping or breaking
Best definition of an alloy?
a mixture of two or more metals
Which of the following sequences is proper for placement of an amalgam alloy?
trituration, condensation, carving
What is the main cause of an overhang on a Class II proximal restoration?
improper placement of the matrix band and wood wedge
Which element is most responsible for reacting with mercury to cause the hardening of dental amalgam?
silver
What is the phenomenon that results when a restorative material contracts and expands which in turn opens and closes the gaps at the margin of a restoration?
percolation
Which of the following materials is most often placed into a deep cavity with the intent of promoting secondary dentin formation?
calcium hydroxide
In some states, including Michigan, it is legal for a dental hygienist to condense and carve restorations?
False
What component of many cements has a definite soothing (obtundant) property of pulpal tissue?
Eugenol
Placing a base in the "bottom" of a cavity preparation serves what purpose?
it helps insulate the pulpal tissue
Which of the follow cements actually bonds to tooth structure?
polycarboxylate cements
Define: Under cuts and grooves
aids in mechanical retention
Define: Trituration
mechanical mixing of amalgam
Define: Creep
Change in material under a load
Define: Dispersion Alloy
mixture of spherical and lathe cut amalgam
Define: Matrix Band
Helps to create a tight DO margin.
Define: Obtundant
soothing properties
Define: Lute
glue
Define: Glass Ionomer
Fluoride releasing
Define: Polycarboxylate
First adhesive in dentistry
Define: Soluable
dissolves in fluid
A patient complains that tooth #3, which contains a crown, is sensitive to hot and cold. The dentist notices that there has been a substantial loss of cement at the margins, and suspects that it is leaking. Which of the follow characteristics of the cement best explains the reason for the cement loss?
Solubility in oral fluids.
In removing a temporary zinc phosphate cement restoration from a molar prepared for an amalgam restoration, the material in the deepest portion of the restoration was left in place. This procedure was followed primarily to:
provide thermal insulation to the pulp
Imbibition is the :
absorption of water by hydrocolloid impressions
The amount of water needed to mix various gypsum products is related to:
size and shape of the gypsum particle
Increasing the water beyond the recommended amount when mixed with the powder (stone) will result in:
a model that is weaker
The preferred method for altering the setting period of an alginate impression is to change the:
temperature of the water
The main difference between model plaster powder and dental stone powder is:
particle size and shape
Why is dental stone vibrated after mixing?
vibration makes the mixture denser by removing trapped air
The most likely reason for portions of teeth breaking off when a plaster or stone model is removed from an impression is:
incorrect mixing technique
The form of gypsum that is mined from the ground is called calcium sulfate:
dihydrate
The form of gypsum in a study model is calcium sulfate :
hemihydrate
Contamination of alginate powder will occur in the presence of:
high moisture
Heat is used during the gypsum manufacturing process to
drive off water contained in the raw material
The weakest of the gypsum products is
dental plaster
Define: Alginate Impression
negative likeness
Define: Fog
A colloid in a semi liquid form
Define: Study model
positive likeness
Define: die
single replication of a tooth
The ability of a material to withstand compressive stresses without fracturing is known as:
malleability
Composite restorations are classified by particle size. T/F
True
The filler component of a resin restoration causes the restoration to appear radiopaque on a radiograph. T/F
True
Strong bonding to dentin requires:
hybrid layer formation
If the inflammation continues until the pulpal tissue cannot recover, this condition is called:
irreversible pulpitis
Plaster requires more water for mixing than stone because:
the crystals are more porous and irregularly shaped
A busy dental hygienist took alginate impression on a patient and left the unwrapped on the counter in the lab. Several hours later, the models were pourred. Which process was most likely to have occurred?
syneresis
This layer of debris prevents contact between intact dentin and bonding agent/adhesive is called:
smear layer
Adhesion of dental materials to enamel is accomplished by:
Acid etching
The name of the removable tooth or teeth in a positive gypsum stone cast used in the fabrication of crowns and bridges is called:
Die
Composites that are currently used for the restoration of anterior teeth are called (this composite produces luster and shine):
nanofills
The dental laboratory ____________ the appliance on models to simulate how it will occlude in various jaw positions.
articulates
The size of the filler particles in a dental composite determines the:
surface smoothness of the resulting restoration
Glass ionomer composites are recommended for class V restorations. T/F
True
Jan, 20 years old, is at the DDS office and inquiring about bleaching options. She has disclosed she is a smoker, has tetracycline stain and is under care for gingivitis. She really wants to have whiter teeth and a healthier mouth. Since Jan has tetracycline stain, what would you tell her about bleaching possibilities?
external bleaching does not work on intrinsic stain
Since Jan has gingivitis, you would recommend what before bleaching:
prophylaxis appointments to obtain a healthy mouth prior to bleaching
Jan smokes and she does not understand how that effects bleaching:
she should cease smoking as it causes gingivitis and extrinsic stains
The most commonly accepted universal impression material type is known as:
alginate impression material
Ideally, dental materials should have a _______ coefficient rate of thermal conductivity.
low?
Which type of bleaching system is used to lighten a tooth that has previously had endodontic treatment?
non vital
What is the correct bleaching agent used for at- home tray bleaching:
hydrogen peroxide
Bonding to dentin is dependent on the mechanical bonding of materials as opposed to chemical bonding. T/F
True
The gypsum product whose powder particles is smallest, round in shape, and produce the strongest and least porous product is:
improved dental stone
Sensitivity in the form of an electrical shock to the pulp that results when two restorations of different metals occlude with each other during mastication is known as:
galvanism
Percolation results when a restorative material _________ and ______________.
expands, contracts
The Linear coefficient of thermal expansion is a measurement of a change in volume of a material in relation to a change in:
temperature
Existing darker composite restorations should be replaced after bleaching so that the new color of the teeth will match the restorations.
T/F
True
In patients with exposed root surfaces, tooth whitening is commonly a contraindication.
T/F
True
A variety of clinical trials have validated the safety and efficacy of tooth whitening, so pregnant and lactating women can safely bleach their teeth.
T/F
False
The ADA recommends disinfecting impressions with sodium hypochlorite prior to pouring them up in plaster or stone.
T/F
True
The bleaching agent used for take- home bleaching trays is carbamide peroxide.
T/F
True
The warmer water mixed with alginate, combined with a warm oral cavity will make the impression material set faster
T/F
True
Define: Intrusive Luxation
Forced inward.