dental materials

fluoride can be found as naturally occurring in which one of the following
A coffe
B raw seafood
C tea
d. beans

when tooth enamel first begins to demineralize what is one of the corrective measures that can be taken to stimulate remineralization
A. stop eating foods with proteins and amino acids
B. use a daily rinse containing fluoride
C. brush with baking soda and salt
D. check the labels on food packages to determine whether they contain fluoride

when enamel is remineralized with fluoride
A. the fluoride contains a poison that kills all bacteria assocaited with dental caries (don't we wish)
B. the resultatn remineralized crystal is more resistant to acids
C. it is a different color
D. all of the calcium is replaced

fluorosis is always considered to be
A. very unsightly
B. a sign that the person will need to have bleaching and restorations
C. destructive to the tooth
D. a sign that the person has ingested more than the optimum amount of fluoride

nightly home fluoride treatment with 1.1% sodium fluoride as a brush on gel or in custom trays is indicated for
A. children younger than years of age
B. middle aged women going through menopause
C. elderly pt taking mediations that cuase dry mouth
D. adolescent with one or two pit and fissrue caries

sealant material is
A. indicated for all permanent molars
B. used for protection of smooth surface caries
C. never in need of replacement once in place
D. an unfilled or lightly filled resin

when a dental sealant is placed the technique
a is exaclty the same as bonding to dentin
b. requries the feild to be kept dry
c. can be done by dental hygienist and assistants in all states
d. always requries the use of a curing light

which one of the following is the best candidate for sealants
A. tooth with decay into dentin
B. tooth with shallow pit and fissures
C. molar with stained fissures in a 50 year old pt
D. newly erupted tooth with numerous deep fissures

if caries in a fissure is undected and is inadvertently coverd by a well placed sealant what will happen?
a caries will progress rapidly
b. caries will progress slowly
c. caires wil stop progressing

very small filler particles are added to sealant materials for which purpose
A. to block opening of fissure
B. to improve the esthetics
C. to decrease wear of sealant
D. to increase adhesion to enamel

how is the surface of the tooth prepared before acid etching for sealant placement
a pt is asked to brush teeth
b. teeth wiped with gauze
c. fluoride gel is applied
d surfaces are cleaned with pumice

the acid most commonly used to etch the enamel for sealant placement is which one
A. hydrochloric acid
B. nitric acid
C. citric acid
D. phosphoric acid

the tip of the light wand of the curing light should be held how close to the sealant?
A. about 1/2 inch away
B. in contact with sealant
C. very close about 1 mm away from the surface
D. with a good light it doesn't matter how far away you are

all of the following except one are reasons why pits and fissures are so susceptible to careis which one is the exception
A. they retain bacteria and food debris
B. toothbrush bristles cannot reach into fissures to clean them
C. the enamel lining them is very thin
D. they are often deep and narrow

after placement of a sealant which of the following should be checked?
A. sealant surface for voids or porosities
B. the occlusion
C. the contact arease with adjacent teeth
D. all of the above

the most common reason for loss of a sealant shortly after placement is which of the following
A. the sealant material was bad
B. inadequate curing time
C. saliva contamination after acid etching
D. inadequate etching time

how should the surface of the enamel appear after acid etching
A. frosty white
B. bright gray
C. shiny
D. slightly yellow

what does the acid etch do to the surface of the enamel
a. creates a roughend irregular surface
b. leaves a smooth clean surface
c. evenly removes about half the enamel
d. none of the above

the most important requirement for successfully bonding sealants to enamel is
A. a high concetnration of acid for etching
B. good isolation to prevent saliva contamination
C. long drying times
D. long etching times

studies hsow caries to occur in pits and fissures most often in which groups of teeth
A. perm max incisors
B. perm molars
C. perm premolars

how does a sealant adhere to the etched enamel surface?
A. shrinking when polymerized it tightly grips the surface
B. sealant is very sticky and adheres to the surface like glue
C. micromechanical retention
D. chemical bond to surface

the main purpose of most desensitizing agents
A. when added to toothpaste, is to improve the taste and keep it from burning the gingiva
B. help dental hygienist keep pt comfortable during dental prophy procedure
C. plug openings of exposed dentinal tubules
D. to close the openings of enamel rods to prevent temp and osmotic changes in enamel fluids

when a mouth guard is prescribed by the dentist fabrication can be done by
a dental assistant
b. dental hygienist
c. laboratory technician
d. all of the above

the main purpose of a mouth guard is
A. keep teeth in alignment after ortho
B. use as bleaching trays
C. use as a tray for placing fluoride on teeth
D. to help protect the teeth and supporting structures during contact sports

custom made mouth guards and splints may be made of
A. thermoplastic sheets of resilient plastic or hard processed acrylic resin
B. composite resin
C. plastic material softened by boiling
D. tay acrylic

bleaching of teeth
A. can cause sensitivity of the teeth
B. can cuase them to become soft
C. affects only extrinsic stains
D. is very predictable

bleaching of teeth works
A. by removing surface stains
B. by penetrating both enamel and dentin and oxidizing the stain
C. by sealing surface porosities so that stain cannot enter the tooth surface
D. by creating a white coating on the surface of the enamel

in office bleaching
A. yay this is my last one!
B. is superior in results to home bleaching
C. produces equivalent results to home bleaching but is faster
D. there are way too many review questions