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1. WO2002022097 - METHOD AND COMPOSITION FOR DENTAL BLEACHING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS.
1. A method for bleaching teeth that have been discoloured by a staining agent, the method comprising the steps of coating an area of at least one tooth to be bleached with a dental bleaching composition and irradiating the coated area with laser energy for a predetermined period of time to activate an oxidising agent contained in the bleaching composition, the activated oxidising agent being capable of reacting with the staining agent to at least partly discolour the staining agent, characterised in that use is made of a laser emitting laser energy of a wave length capable of inducing a photochemical generation of radicals of the oxidising agent, which radicals in turn are capable of reacting with the staining agent to form a compound that is free of a conjugated electron system capable of absorbing visible light.
2. A method as claimed in claim 1 , characterised in that a laser is used emitting laser energy with a wave length of between approximately 525-545 nm.
3. A method as claimed in claim 1 or 2, characterised in that a laser is used emitting laser energy with a wave length of approximately 532 nm.
4. A method as claimed in any one of claims 1-3, characterised in that use is made of a dental bleaching composition containing an absorbing agent with a colour substantially complementary to the laser light.
5. A method as claimed in any one of claims 1-4, characterised in that use is made of a dental bleaching composition containing Rhodamine as an absorbing agent.
6. A method as claimed in any one of claims 1-5, characterised in that use is made of a dental bleaching composition containing 38-42 % by weight of a peroxide compound as an oxidising agent.
7. A method as claimed in any one of claims 1-6, characterised in that a dental bleaching composition is used with a pH of between 8.5-10.5, preferably 9-9.5.
8. A method as claimed in any one of claims 1-7, characterised in that at least the area of the teeth to be bleached is freed of moisture and/or cleaned before applying the bleaching composition.

9. A topical dental bleaching composition containing a bleaching agent capable of interacting with a staining agent present in teeth, a pH adjusting compound, a thickening agent and a laser absorption enhancing compound, characterised in that the bleaching agent is a compound capable of generating radicals of the oxidising agent upon irradiation with electromagnetic irradiation with a wave length of approximately 525-545 nm, the oxidising agent being capable of reacting with the staining agent to form a compound that is free of a conjugated electron system capable of absorbing visible light.
10. A topical dental bleaching composition as claimed in claim 9, characterised in that the composition contains 30-50 wt. %, preferably 38-42 wt. % of a bleaching agent.
11. A topical dental bleaching composition as claimed in claim 9 or 10, characterised in that the composition contains an absorbing agent capable of absorbing energy with a wave length of 525-545 nm.
12. A topical dental bleaching composition as claimed in any one of claims 9 - 11 , characterised in that the composition contains a colourant selected from the group of Rhodamine ®, acid Fuchsin, Alizarin Red, Basic Fuchsin, Carmine, Congo Red, Darrow Red, Oil Red O, Methyl Orange, Natural Red, Orange, Methyl Red, Chlorphenol Red, Phenol Red.
13. A topical dental bleaching composition as claimed in any one of claims 9 - 12, characterised in that the composition has a pH of between8.5-10.5, preferably 9-9.5.