Bleaching
„Principle of bleaching is a chemical
reaction based on oxidation.
The coloured material is
trensformed into less coloured up to
colourless material.
Chemical reactions
Hydrogen peroxide free radicals
2H2O2 O + HOH OH
 Radicals split of double bonds
Opening of cyclic compounds (chromofors)
Changes of the molecular structure
Shift of spectrum of absorption
Colour of teeth and its changes
Natural optical properties of teeth
Arteficial discoloration
Developmental reasons
Typy bělení
Zevní bělení
Vnitřní bělení
Kombinace
Bleaching agents
Hydrogen peroxide
3% – 35 %
Carbamide peroxide
10% - 30%
Sodium parborate
Calcium peroxide
Effective chemical
Hydrogen peroxide
3% – 38 %
Carbamide peroxide
10% - 30% urea and hydroden peroxide
Sodium perborate sodium metaborate
and hydrogen peroxide
O
C
H2N NH2 • H2O2
Močovina Peroxid vodíku
2 H2O2 2 H2O + O2
Carbamide peroxide
6% CP:  2% H2O2
10% CP:  3% H2O2
16% CP:  5% H2O2
30% CP:  11% H2O2
20% CP  7% H2O2
Ways of bleaching
Strong (intense)
Weak
External
Internal
In dental office
Home bleaching
Dentist controlled
OTC
Differences
The only difference is in rapidity
External bleaching - indications
Arteficial discoloration
External bleaching -
contraindications
1. Dental caries
2. Fillinfs and crowns with gaps
3. Multiple frontal fillings
4. Cervical defects
5. Dentinal hypersensitivity
6. Active periodontitis
7. Systemic diseases
8. Gravidity and breast feeding
9. Age to 12
External bleaching
Strong
- Direct bleaching
- Assisted bleaching
Strong external bleaching
Hydrogen peroxide is applied on teeth (35-38%)
Decomposition is accelerated by
- heating
- light
- chemically
Chemical activation
Opalescence Xtra Boost
Vital bleaching
Opalescence Xtra Boost
Vital bleaching
Assisted bleaching
Tray
Control during the
procedure
Strong bleaching
Weak bleaching
External bleaching step by step
Control of colour
Custom tray
Fabrication of the tray
Return to Menu
Return to Menu
Opalescence
Tray fabrication
Opalescence
Tray fabrication
Bleaching without the tray
Bleaching without tray
Ivoclar
Vivadent
VivaStyle
Paint On
GoSmile GoSmile
Dexcel Xantia
Colgate Simply White
Denmat
Rembrandt
Plus
Procter &
Gamble
Crest White
Strips
Procter &
Gamble
Crest Night
Effects
Brite Smile
Brite Smile To
Go
• Gely s carbamid
peroxidem, peroxidem
vodíku nebo
perkarbonátem sodným
• Aplikace
Štětečky
Polyetylénovými proužky
Bleaching without the tray
VivaStyle Paint On
Varnish for home bleaching
Internal bleaching
Procedure
Is bleaching safe?
Main questions
Influence on teeth structure and their
mechanical properties
Influence on quality of fillin
Influence on bonding
Final effect and its longevity
Influence on dental pulp and periodontal
ligament
Without bleaching
After bleaching
Microabrasion
Mechanical abrasion
Sandblasting
Fine diamond or disc
Fluoridation