Apparatus and method for measuring optical characteristics of teeth
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Accused Products
Abstract
Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base.
106 Citations
94 Claims
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1-65. -65. (canceled)
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66. A method for determining optical characteristics of a dental object with a handheld instrument having a probe comprising the steps of:
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applying a protective tip to the probe, wherein the protective tip serves to prevent contact between the probe and the dental object, wherein the protective tip includes a hole for coupling light from the probe to a measurement spot on the dental object; moving the probe having the protective tip applied thereto in proximity to a reference standard of known optical properties, and activating a calibration/normalization measurement of the reference standard via a switch/button user interface, wherein calibration/normalization data are stored based on electronic and optical properties of the handheld instrument having the protective tip applied thereto; moving the probe having the protective tip in proximity to the dental object, and activating a measurement of the measurement spot of the dental object via the switch/button user interface, wherein light is provided to the measurement spot and returned from the measurement spot and coupled to an optical sensor; measuring light returned from the measurement spot of a plurality of wavelengths/spectral bands with the optical sensor, wherein a first frequency proportional to an intensity of a first wavelength/spectral band of light returned from the measurement spot is determined, a second frequency proportional to an intensity of a second wavelength/spectral band of light returned from the measurement spot is determined, and a third frequency proportional to an intensity of a third wavelength/spectral band of light returned from the measurement spot is determined, wherein color measurement data are determined based on the light returned from the measurement spot based on at least the first, second and third frequencies; based on the color measurement data, selecting a closest match of a plurality of electronically stored shade guide values of one or more dental shade guide systems; and outputting the closest match of the plurality of electronically stored shade guide values of the one or more dental shade guide systems. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
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86. A method for determining optical characteristics of a dental object with a handheld instrument having a probe comprising the steps of:
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applying a protective tip to the probe, wherein the protective tip serves to prevent contact between the probe and the dental object, wherein the protective tip includes a hole for coupling light from the probe to a measurement spot on the dental object; moving the probe having the protective tip applied thereto in proximity to a reference standard of known optical properties, and activating a calibration/normalization measurement of the reference standard, wherein calibration/normalization data are stored based on electronic and optical properties of the handheld instrument having the protective tip applied thereto; moving the probe having the protective tip in proximity to the dental object, and activating a measurement of the measurement spot of the dental object, wherein light is provided to the measurement spot via one or more light sources and returned from the measurement spot and coupled to one or more optical sensors for determination of color measurement data; measuring light generated via the one or more light sources in a plurality of wavelengths/spectral bands with one or more of the optical sensors, wherein a first frequency proportional to an intensity of a first wavelength/spectral band of light generated via the one or more light sources is determined, a second frequency proportional to an intensity of a second wavelength/spectral band of light generated via the one or more light sources is determined, and a third frequency proportional to an intensity of a third wavelength/spectral band of light generated via the one or more light sources is determined, wherein the color measurement data are determined based in part on at least the first, second and third frequencies; based on the color measurement data, selecting a closest match of a plurality of electronically stored shade guide values of one or more dental shade guide systems; and outputting the closest match of the plurality of electronically stored shade guide values of the one or more dental shade guide systems. - View Dependent Claims (87, 88, 89, 90, 91, 92, 93, 94)
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Specification