Abstract:
Color measuring systems and methods such as for determining the color or other characteristics of teeth are disclosed. Perimeter receiver fiber optics are spaced apart from a central source fiber optic and receive light reflected 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 color measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence 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 is part of a patient data base.
Abstract:
A dental colour mixture indicator device is described. In an embodiment, the dental colour mixture indicator device (420) comprises four component indicator devices (400-403) each retained by a common base (410). Each component indicator device (400-403) has an array of colour samples (Y1-2, C1-3, R1-2) mounted to individual blades (430, 440-442, 450-452, 460-462), with each group of blades able to be plucked from the base (410) for the purposes of a comparison with a tooth. Each colour sample (Y1-2, C1-3, R1-2) corresponds with an artificial tooth material, and, on the basis of the comparison, a mixture of the respective tooth materials allows correct colour matching of a restorative tooth. The arrayed colour samples (Y1-2, C1-3, R1-2), coincide with a corresponding location on a colour co-ordinate system. The central colours (201) of each component indicator device (400-403) are offset from other ones of central colours with respect to the colour co-ordinate system. This means a fewer number of samples are required than in the prior art to encompass the whole body of tooth colour.
Abstract:
A method of computerised colour matching for articles where articles are photographed, using a still video camera, against a set of reference colours. The photographs are stored on a diskette (34) which is read on a recorder (54). The compouter (55) compares the set of reference colours against an absolute set of colours and generates a compensation factor which is applied to the photographed colours to produce a corrected photograph. Areas of the corrected photograph may be selected for computer enhancement and a computer generated map may be produced to enable the colour of other articles to be matched to the photographed articles.
Abstract:
The invention makes it possible to determine the colour to be given particularly to a dental prosthesis from the measurement of the colour of adjacent teeth in the mouth of the patient. An optical fiber instrument (44) senses the light reflected by a tooth (50) and transmits the light to the input of a spectrocolorimeter (12, 14) associated with a microprocessor (10) in order to determine the spectral reflectance diffused by the tooth and to calculate the trichromatic components of its apparent colours for various types of lighting. The invention applies particularly to the determination of colours of dental prostheses.
Abstract:
Dispositif pour déterminer exactement la couleur d'une prothèse dentaire à poser, ou bien du matériau à utiliser dans les obturations de cavités dentaires, de manière à les rendre parfaitement identiques à la couleur des dents du patient. Il comporte une source lumineuse (1) émettant des rayons lumineux sur un monochromateur (2), lequel, à l'aide d'un commutateur ou d'un hacheur optiques (3), sépare lea rayons lumineux monochromatiques en au moins deux circuits parallèles (4, 4a, 5, 5a), l'un (4, 4a) comprenant un logement ou cellule (6) pour au moins une des dents du patient (9), l'autre (5, 5a) comprenant une cellule témoin (7) renfermant un échantillon témoin (28) de couleur blanche. Lesdits circuits aboutissent à un dispositif (8) qui détecte et compare les rayons provenant de la cellule (7) et ceux qui sont passés à travers la cellule (6) et la ou les dent(s) (9), fournissant une séquence de signaux qui sont appliqués à un détecteur (8), puis dûment amplifiés et appliqués à un convertisseur analogique-numérique (12) connecté à un processeur de données ou un ordinateur (10), lequel fournit les données d'identification codée relatives à la couleur identifiée.
Abstract:
The invention relates to a device and a method for optical 3D measurement, wherein said device can be switched between a first mode for optical 3D measurement using a chromatic confocal measurement method or the triangulation measurement method and a second mode for colorimetric measurement. In the first mode, a broad-band illuminating beam is focused onto a first plane and in the second mode the broad-band illuminating beam is focused onto a second plane other than the first plane at a distance d from the surface of the object to be measured.