Abstract:
PROBLEM TO BE SOLVED: To provide an image system for dentistry which can correctly determine a darkness of the tooth, can appropriately express additional outward appearance characteristics of the tooth such as color change, texture, luster, transparency and semitransparency, can visualize the color of an artificial tooth, and can evaluate and confirm the color of the manufactured artificial tooth. SOLUTION: The method is to determine a visual colorimetric value regarding an object having a specific spectral reflectance characteristic. The device has (a) a step to photograph the object by an electronic image capture device in order to form a device image value, and (b) a step to select one conversion from a plurality of conversions for converting a device image value to the visual colorimetric value, and the selection of the conversion is based on the specific spectral reflectance characteristic of the object, and the device also has (c) a step to apply the selected conversion to the device image value for determining the visual colorimetric value of the object. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
A method of making a dental restoration has the steps of capturing an image of a tooth, posterizing the image, determining a tooth color structure, providing information about a multicolored block having a block color structure, matching the tooth color structure and the block color structure, based on the matching, determining a position within the block in which the tooth color structure and the block color structure match, and machining the dental restoration from the block at the determined position. The invention helps facilitating the making of dental restorations at maximized aesthetics.
Abstract:
A method for intraoral imaging obtains a digital image of one or more teeth and detects first and second boundaries. At each of the first and second boundaries, there is calculated a boundary ratio of mean gray-scale values for the tooth area on one side of the boundary to mean gray-scale values for background areas on the other side. The calculated boundary ratios are stored. A third ratio of the mean gray-scale values for the tooth area near the first boundary to the mean gray-scale values for the tooth area near the second boundary is calculated and stored. A vector is formed and stored that contains at least the calculated boundary ratios and the third ratio. The tooth surface is classified as either smooth or occlusal according to the stored vector. The image data is processed according to the classification and processing results are reported.
Abstract:
An apparatus for imaging a tooth having a light source with a first spectral range and a second spectral range. A polarizing beamsplitter (18) light having a first polarization state toward the tooth and directs light from the tooth having a second polarization state along a return path toward a sensor (68), wherein the first and second polarization states are orthogonal. A first lens (22) in the return path directs image-bearing light from the tooth, through the polarizing beamsplitter (18), toward the sensor (68), and obtains image data from the redirected portion of the light having the second polarization state. A long-pass filter ( 15) in the return path attenuates light in the second spectral range. Control logic enables the sensor to obtain either the reflectance image or the fluorescence image.
Abstract:
A color measurement instrument and color measurement method for measuring a color of a surface are provided. The instrument includes a plurality of independently switchable light sources characterized by differing spectral ranges, and a plurality of light guides configured to receive light from the light sources and to direct the received light to a light emitting portion of the instrument for illuminating the surface. The instrument further includes a first light detector configured to receive a portion of the light reflected from the surface. The first light detector is a wideband light detector.
Abstract:
An apparatus for obtaining an image of a tooth having at least one light source providing incident light having a first spectral range for obtaining a reflectance image (122) from the tooth and a second spectral range for exciting a fluorescence image (120) from the tooth. A polarizing beamsplitter (18) in the path of the incident light from both sources directs light having a first polarization state toward the tooth and directs light from the tooth having a second polarization state along a return path toward a sensor (68), wherein the second polarization state is orthogonal to the first polarization state. A first lens (22) in the return path directs image-bearing light from the tooth toward the sensor (68), and obtains image data from the portion of the light having the second polarization state. A long-pass filter (15) in the return path attenuates light in the second spectral range.
Abstract:
A processor implemented prosthodontia system employs digital imaging of a restoration site and surrounding areas of an oral cavity and digital sampling of colorimetric values of tooth surfaces. The processor selects digital image data representative of a tooth surface configuration corresponding to the tooth number of the tooth to be restored and generates a three dimensional image of the restoration, with colorimetric values. Data comprising the shape and colorimetric values of the restoration is transmitted to a fabrication station for processor controlled fabrication through implementation of, for example, a three dimensional jet printing system employing particulate porcelain, polymeric dental composite, etc., and a binder, solvent or reactant and which builds a preform in successive layers of incremental cross sectional heighths. The shaped and colored preform is then hardened to produce a restoration having the specified size, shape and colorimetric values.
Abstract:
L'invention concerne un dispositif de détermination automatique de la teinte d'un objet (10), comportant une source lumineuse, un capteur de lumière disposé de manière à prélever sur une zone de l'objet la lumière réfléchie ou ayant traversé l'objet (20, 30, 40), comprenant en outre des moyens d'analyse de longueur d'onde sur cette lumière après réflexion ou traversée de l'objet, ces moyens délivrant un relevé spectrométrique correspondant à la zone de prélèvement, caractérisé en ce que les moyens d'analyse sont prévus pour analyser un ensemble de tels relevés spectrométriques correspondant à différentes zones (20, 30, 40) de l'objet (10) et identifier un relevé spectrométrique moyen à partir de cet ensemble de relevés spectrométriques.
Abstract:
The present invention provides an improved system for measuring the appearance of an object, that improves upon the prior art systems by employing a digital CMOS camera and a variety of features attendant thereto, provides an improved calibration system, an improved quality control system, an improved tooth whitening system, and an improved crown design system.