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A light hardening device is provided for hardening a light hardenable mass applied for dental purposes that has a first light emitting diode for emitting light at a range of intensities corresponding to a set of wavelengths which at most only partially overlap a range of light sensitivities of a pho

A light hardening device is provided for hardening a light hardenable mass applied for dental purposes that has a first light emitting diode for emitting light at a range of intensities corresponding to a set of wavelengths which at most only partially overlap a range of light sensitivities of a photo initiator comprised in the mass. The light hardening device also includes a second light emitting diode for emitting light at a range of intensities corresponding to a set of wavelengths which overlap the set of photo initiator light sensitivities to a relatively greater extent than the partial overlap of the range of first light emitting diode intensities with the range of photo initiator light sensitivities.

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1. A light hardening device for hardening a light hardenable mass applied for dental purposes, the light hardenable mass having a photo initiator actuable to initiate hardening of the mass upon irradiation of the photo initiator with light and the photo initiator being sensitive to light across a ra

1. A light hardening device for hardening a light hardenable mass applied for dental purposes, the light hardenable mass having a photo initiator actuable to initiate hardening of the mass upon irradiation of the photo initiator with light and the photo initiator being sensitive to light across a range of sensitivities which vary from one another at different wavelengths of a set of photo initiator wavelengths, the light hardening device comprising:a first light emitting diode for emitting light at a range of intensities which vary from one another at different wavelengths of a set of first light emitting diode wavelengths, the range of first light emitting diode intensities overlapping the range of, photo initiator light sensitivities at most only partially; anda second light emitting diode for emitting light at a range of intensities which vary from one another at different wavelengths of a set of second light emitting diode wavelengths, the range of second light emitting diode intensities overlapping the range of photo initiator light sensitivities to a relatively greater extent than the partial overlap of the range of first light emitting diode intensities with the range of photo initiator light sensitivities. 2. A device according to claim 1, wherein the sensitivity maximum of the photo initiator differs from the emission maximum of the second light emitting diode by less than 20 nanometers and, in particular, by less than 15 nanometers, and, preferably, the sensitivity maximum of the photo initiator is at a wavelength which is approximately 10 nanometers larger than the wavelength of the emission maximum of the second light emitting diode. 3. A device according to claim 1, wherein, in a plot of the emissions spectrum of the second light emitting diode and the sensitivity spectrum of the photo initiator in a two dimensional graphical format in which values of the relative intensity or sensitivity are arranged on the Y axis and values of the wavelength are arranged on the X axis, the second light emitting diode has an emission spectrum having a steep flank and, preferably, having two steep flanks, each steep flank having a larger slope than the flanks of the sensitivity spectrum of the photo initiator, and the plot of the emissions spectrum of the second light emitting diode is substantially symmetrically enclosed within the plot of the sensitivity spectrum of the photo initiator. 4. A device according to claim 1, wherein the photo initiator comprises camphor quinone having a sensitivity maximum of approximately 470 nanometers and the emissions maximum of the first light emitting diode has a wavelength larger than 470 nanometers. 5. A device according to claim 1, wherein the emissions value of the first light emitting diode at the wavelength value of the sensitivity maximum of the photo initiator is substantially less than the emissions maximum of the first light emitting diode, and especially, is at least ten times less than the value of the emissions maximum of the first light emitting diode. 6. A device according to claim 1, wherein the light emission intensity of the first light emitting diode as integrated over the surface area of the spectrum of the first light emitting diode is at least 100 mW/cm 2 . 7. A device according to claim 1, wherein the first light emitting diode has its emission maximum in the green spectral region and the maximum is preferably in the region of between 500 to 520 nanometers, and especially, is in the region between approximately 503 to 508 nanometers and, most preferably, is at 505 nanometers. 8. A device according to claim 1, wherein the light emission intensity of the second light emitting diode over the spectrum of the second light emitting diode is at least 300 mW/cm 2 and, preferably, is between 600 to 1000 mW/cm 2 . 9. A device according to claim 1, wherein the emission maximum of the second light emitting diode is in the region of 440 to 470 nanometers. 10. A device according to claim 1, wherein the first light emitting diode is comprised in a group of first light emitting diodes and the second light emitting diode is comprised in a group of second light emitting diodes, each respective group of the first light emitting diodes and the second light emitting diodes being commonly controllable. 11. A device according to claim 1, and further comprising a control device which is operable to actuate the first light emitting diode before actuation of the second light emitting diode, and the control device actuates the first light emitting diode for a first predetermined time and actuates the second light emitting diode for a second predetermined time. 12. A device according to claim 1, wherein the mass to be applied in the dental application comprises at least two photo initiators. 13. A device according to claim 1, wherein the first light emitting diode has a relatively larger wavelength and a relatively smaller intensity than the second light emitting diode. 14. A method for polymerizing a light hardenable mass applied for dental purposes with a light hardening device, the light hardenable mass having a photo initiator actuable to initiate hardening of the mass upon irradiation of the photo initiator with light and the photo initiator being sensitive to light across a range of sensitivities which vary from one to another at different wavelengths of a set of photo initiator wavelengths, and the light hardening device having two light emitting diodes having differing emission spectrums, the method comprising:irradiating the mass with a first light emitting diode of the light hardening device during a first time period such that the first light emitting diode emits light in an emission spectrum which at most only partially overlaps the sensitivity spectrum of a photo initiator of the mass. 15. A method according to claim 14, wherein the second light emitting diode of the light hardening device has an emission spectrum which is substantially coincidental with the sensitivity spectrum of a photo initiator of the mass and the method further comprises actuating the second light emitting diode after actuation of the first light emitting diode. 16. A method according to claim 15, wherein the mass is irradiated solely with light emitted by the first light emitting diode during the first time period to at most partially harden the mass, excess mass material is thereafter removed, and, subsequently, the mass is completely hardened by irradiation of the mass by the second light emitting diode.