Custom Trays

DENT 3316 Dental Materials

true or false

bleaching is recommended before restorative work (crowns, veneers)

true

true or false

bleaching is recommended to allow shade of esthetic restoration to match existing tooth color

true

true or false

restorative tx is usually delayed 2 weeks after bleaching

true

true or false

bleaching helps lighten discolored teeth

true

true or false

bleaching helps lightened restorative work

false

how many shades lighter does bleaching help lighten stained or discolored teeth?

1-3 shades lighter

what are the factors that affect bleaching?

(a) cause or type of discoloration or stain

(b) degree or intensity of discoloration or stain

(c) bleaching agent selected (strength)

(d) length of exposure of tooth

(e) can be used on vital and non-vital teeth

(f) all of the above

(f) all of the above

extrinsic stain

topical medications, tobacco, food

what colors are normally associated with extrinsic stains?

green, black, orange, brown, yellow, blue-green, and red-black

are whitening efforts more successful with extrinsic or intrinsic stains?

extrinsic stains

intrinsic stain

post eruptive stain - occurs after tooth has erupted

examples of intrinsic stains

amalgam stain and endodontic tx

tetracycline, fluorosis, dentinogenesis, and amelogenesis imperfecta

pre-eruptive stain

pre-eruptive stain

occurs before tooth eruption

walking bleach

sodium perborate monohydrate and 30% hydrogen peroxide

vital teeth use what type of bleaching agent?

hydrogen peroxide (H2O2) 2-10%

carbamide peroxide (CH6N2O3) 10-35%

what hydrogen peroxide solution % is available to dental professions?

14%

non-vital teeth use what type of bleaching agent?

sodium perborate

why do we bleach prior to restorative work?

we want the restorative work to match the lighter shade of the teeth since restorative work cannot be bleached

why do we wait 2 weeks post bleaching to have work done?

it can interfere with the bond strength

how should we place bleaching gel in the tray?

a small drop of gel half way up the inner surface of each tooth in the tray

what is the recommended bleach time for 10% hydrogen peroxide?

(a) 4-6 hours

(b) 30-45 minutes

(c) 8-10 hours

(d) 2-4 hours

(e) none of the above

(c) 8-10 hours

what is the recommended bleach time for 16% hydrogen peroxide?

(a) 4-6 hours

(b) 30-45 minutes

(c) 8-10 hours

(d) 2-4 hours

(e) none of the above

(a) 4-6 hours

what is the recommended bleach time for 22% hydrogen peroxide?

(a) 4-6 hours

(b) 30-45 minutes

(c) 8-10 hours

(d) 2-4 hours

(e) none of the above

(d) 2-4 hours

what is the recommended bleach time for 35% hydrogen peroxide?

(a) 4-6 hours

(b) 30-45 minutes

(c) 8-10 hours

(d) 2-4 hours

(e) none of the above

(b) 30-45 minutes

what is the recommended bleach time for patients bleaching for the first time?

30-60 minutes

true or false

keep the time the same when little to no tissue or tooth sensitivity occurs

false - increase

what percent of bleaching occurs in the first 1-2 hours?

50%

true or false

allergies is a contraindication/concern

true

true or false

tooth sensitivity is not a contraindication/concern

false

true or false

pregnancy is a contraindication/concern

true

true or false

having many anterior restorations that the pt does not want to replace is not a contraindication/concern

false

true or false

being a child or an adolescent is a contraindication/concern

true

true or false

active periodontal disease is not a contraindication/concern

false

true or false

having gross decay/cracked enamel is a contraindication/concern

true

true or false

the inability to provide consent is not a contraindication/concern

false

what are the side effects of bleaching?

(a) irritated/burned oral tissue

(b) sore throat

(c) hypersensitive teeth

(d) sore muscles and jaw

(e) all of the above

(f) none of the above

(e) all of the above

true or false

clean trays with a soft toothbrush or Q-tip and cool water

true

true or false

you can freeze bleach gel

false

true or false

gel may be refrigerated but should not be frozen

true

who are fluoride trays useful for

(a) patients with high caries risk

(b) patients with sensitivity from bleaching

(c) patients with xerostomia

(d) patients undergoing radiation therapy

(e) all of the above

(f) none of the above

(e) all of the above

stock mouthguard

one size fits all, OTC, least protection

boil and bite mouthguard

user formed, OTC, little protection

custom mouthguard

lab fabricated, custom fit, best protection

what 2 ingredients make custom acrylic trays?

powder and monomer liquid

do acrylic trays create an endothermic or exothermic reaction?

exothermic reaction

what type of tray accommodates anatomic anomalies such as lingual tori?

(a) mouthguard

(b) bleach tray

(c) custom acrylic tray

(d) bruxism/snoring tray

(e) none of the above

(c) custom acrylic tray

what is used for enamel microabrasions?

6% hydrochloric acid and pumice

how often do you use treatment for enamel microabrasions?

repeat up to 3 times

mild fluorosis appears as

enamel microabrasion

hypermineralized spots appear as

enamel microabrasion

remineralized demineralization appears as

enamel microabrasion

what types of trays are made from thermoplastic material

(a) bleach

(b) fluoride

(c) mouth guards

(d) custom trays

(e) all of the above

(f) none of the above

(g) all but d

(g) all but d

what types of trays are made from thermoset materials

(a) bleach

(b) fluoride

(c) mouth guards

(d) custom trays

(e) all of the above

(f) none of the above

(g) all but d

(d) custom trays

thermoset materials are molded and then polymerized in the final shape. they are resistant to change when heated

(a) the first statement is true and the second statement is false

(b) the first statement is false and the second statement is true

(c) both statements are true

(d) both statements are false

(c) both statements are true

do thermoplastic or thermoset materials have a polymer that softens on heating and then hardens into the final shape upon cooling?

thermoplastic

vital teeth?

living teeth - color of natural tooth varies from person to person. as a person ages their teeth will darken

non-vital teeth?

dead due to an injury etc.

tooth turns dark, bleach can be sued inside the tooth after a root canal to lighten the tooth to match other teeth in the mouth