Materials exam 6
Once teeth are whitened, they never relapse.
FALSE
Amalgam stains are easily removed by whitening
False
After vital teeth whitening, esthetic restorations should be completed
False after esthetic restorations vital teeth whitening should be completed
During a laser in-office whitening procedure, it is very important for the patient and the clinician to both wear standard safety glasses
False; you must where specialized safety glasses
Setting times are sometimes measured with a surface penetration test using which of the following ?
Gilmore needles
The characteristic of melting and gelling at different temperatures is called
Hysterisis
The success of a whitening procedure depends on the following factors with one EXCEPTION. Which one is the EXCEPTION?
Race
To increase the setting time, the clinician can do which of the following?(slower setting product)
add borax
When mixing alginate impression material, the clinician should
add liquid to powder
When mixing gypsum, the clinician should:
add powder to liquid
The most popular type of elastomeric impression material is
addition silicone
Inelastic impression materials include all of the following EXCEPT one. Which one is the EXCEPTION?
agar
Which material is a reversible hydrocolloid is premixed by the manufacturer and supplies as a semisolid material in tubes and sticks?
agar
Patients should not bleach if they have which of the following?
all of the above.
Over bleaching one's dentition could be a sign of what disorder?
body dysmorphic disorder
After placement, the sealant should be checked for:
bubble, irregularities.
The process of heating gypsum is heated to remove some of the chemically combine water is called:
calcining
What is the function of the impression tray?
carrier and stabilizers of material
Properly etched and dried enamel appears:
chalky white
Impressions are used in the mouth to make replicas called casts which are used for
exact replica of the size and shape
"Walking bleach" can also increase free radical formation in the root canal of a non-vital tooth and lead to which of the following?
external resorption
This type of stain occurs on the surface of the tooth
extrinsic stain
Alginate is supplied as a paste-paste system from the manufacturers.
false
Alginate materials are more accurate than reversible hydrocolloid materials
false
Casts or ides should be allowed to set preferably 1 to 2 hours.
false
Dry strength is the strength that is measured when the sample contains some or all of the water in excess of the theoretical amount required for hydration.
false
The cost of different types of impression materials is about the same and very competitive.
false
The temperature of the water added to alginate has no effect on the setting time.
false
An impression is a positive reproduction, whereas the replica or model is a negative reproduction of the teeth
false; a positive reproduction is a replica or model and a negative is an impression
___________ represents the length of time from the start of the mix until the setting mix becomes rigid and can be separated from the impression
final set time
A type of impression material that is not recommended for dentulous patients because it sets hard and rigid and would "lock" around teeth is:
inelastic impression material
Advantages of using metal impression trays include all of the following EXCEPT one. Which one is the EXCEPTION?
inexpensive
Application of a paint-on resin dam prior to power whitening helps by:
isolate teeth and gingiva
The different-shaped trays are designed to take impressions of different oral conditions such as which of the following:
partially endentulous teeth
Which type of gypsum is the weakest?
plaster
Impression materials are supplied in a variety of forms which include all of the following EXCEPT one. Which one is the EXCEPTION?
powder liquid system
Which of the following is the professionally applied whitening material?
power light/ heat activated
Dental sealants are effective in _____ dental caries
preventing
The oxidizing agent that is only present in non-vital tooth whitening is:
sodium per borate
Reversible hydrocolloid (agar) impression material is NOT used to make impressions for:
study models
Which of the following treatment options is the most conservative treatment option for esthetic improvement of discolored or stained teeth?
teeth whitening
Which of the following is an example of intrinsic stain?
tetracycline stain, fluorosis
Impression materials set by chemical reactions to form elastic rubber materials are called
thermoset
When performing an in-office whitening, precautions must be taken to protect which of the following?
to protect eyes, skin, gums everything, lips
The type of impression tray that records an impression of the prepared tooth, an impression of the opposing teeth, and a bite registration, all at the same time is called
triple tray
Condensation silicone impressions must be poured without delay.
true
The effect of whitening dentifrices is achieved primarily through the mechanical removal of extrinsic stain by an abrasive.
true
The measure of a liquid's ability to flow
viscosity
The major component of hydrocolloid impression material is
water
After non-vital teeth whitening, esthetic restorations should be completed
1 week
When performing a power whitening, the clinician should advise the patient to avoid foods and drinks that stain a white blouse for how long?
24 to 48 hours
Regular set material gel in
3 to 4 minutes
During a patient-applied, professionally supervised whitening procedure with a whitening agent containing hydrogen peroxide, the patient should be instructed to wear the trays for
30 minutes each session
A 10% carbamide peroxide solution is equivalent to what strength of hydrogen peroxide?
37%
Hydrogen peroxide is applied to the teeth in either a liquid or a gel form and in strengths varying from:
5-35 %
Examples of stain that occurs before tooth eruption include all of the following EXCEPT one. Which one is the EXCEPTION?
Brown stain, or any type of stain that is extrinsic
