Ch 17 Teeth Whitening Flashcards
What is tooth whitening?
- Cosmetic procedure that lightens the color of the teeth by removing stains or discoloration.
- Most conservative treatment option for esthetic improvement of discolored
What us vital tooth whitening?
- Non-invasive procedure that can be used to treat teeth that have become stained or discolored due to food, tobaco or age.
What is a nonvital tooth whitening?
A procedure that whitens the inside of a tooth that has no blood flow
Tooth whitening success dependent upon?
- cause or type of stain
- degree/intensity
- whitening agent
- strength of agent
- length of exposure to tooth
- whitening techniuque
- tooth vitality
- presence of restoration
What are the different types of posteruptive stain?
- Amalgam restorations
- Caries
- Endodontic Treatments
What are the different types of preeruptive stain?
- Tetracycline
- Fluorosis
- Dentinogenesis imperfecta
- Amelogenesis imperfecta
How are extrinsic stain removed?
- Brushing with toothbrush and toothpaste
- scaling and polishing
- whitening treatments
What are the chemical agents for a vital tooth whitening?
- Hydrogen Peroxide (h2o2)- Decomposes into water and oxygen- releases free radicals of oxygen which reacts with pigments producing whitening effet.
- Carbamide Peroxide (CH6N2O3)
What is Hydrogen Peroxide ?
- can be liquid or gel
- strengths vary 5 to 35%
- Can penertrate enamel and dentin
Hydrogen Peroxide produces what?
- reversible pulpitis- temporary inflammation of pulp tissue.
What does reversible pulpitis results into ?
- Tooth sensitivity- main side effect reported from whitening
What does carbamide peroxide decomposes into?
- Urea and Hydrogen peroxide then it breaks down to water and oxygen
What is carbamide peroxide?
strength vary from 10 to 20%
more stable than hydrogen peroxide products
contains carbopol- thickening agen increases adhesion
For every 30% Carbamide peroxide the is how many hydrogen peroxide?
10
10% carbamide peroxide is equivalent to about 3% hydrogen peroxide ?
True
___ carbamide peroxide is equivalent to about ___ hydrogen peroxide ?
15% to 5%
What is the break down time for hydrogen and carbamide peroxide?
Hydro- ative for 30-60 min
Carbamide- active for about 8 hrs
What are some other chemicals agents used for tooth whitening?
Sodium Perborate- weak, used with hydro
What chemical agent are used for nonvital tooth whitening?
- Sodium Perborate (crystalline form)
- Hydrogen Peroxide 35%
Both used together
What does research show that using both sodium perborate and hydrogen peroxide can cause?
cervical resorption
What is the nonvital whitening process?
- walking bleach (nickname)
- sodium perborate crystals packed into hole from RCT
- mixed with liqued
- cover opening with cavit
- see bacin in 1-2 weeks to remove
How much percentage of hydrogen peroxide concentrations is used in office?
15-35%
How much hydrogen concentrations is used with patient applied?
2-10%
worn for 30 min
How much of carbamide peroxide concentrations is used with patient applied?
- 10-22%
- worn for mutiple 2 hours session or overnight
Whitening will rebound within ___ and patient should not start restorative procedures within __ weeks of whitening?
2 weeks
What are some contraindications?
- Pregnant/nursing
- enamel cracked or hypoplastic
- carious lesions are present
- cervical abrasions, sensitve recession areas tooth sensitivity
- radiation
- diagnoses with melanoma
- amalgam stains
- extensively restored teeth
- allergies
Tooth sensitivity may be prevented with use of dentifrice containing what?
potassium nitrate 2 weeks prior
Sensitivity can be reduced by ?
Using neutral sodium fluoride or potassium nitrate twice daily for 30 min
