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Judgments of appearance matching by means of the visual criteria established by the United States Public Health Service (USPHS) and by means of an extended visual rating scale were determined for composite resin veneer restorations and their comparison teeth. Using a colorimeter of 45 degrees/0 degrees geometry and the CIELAB color order system we used the(More)
OBJECTIVES The use of calibrated, commercial digital cameras for dental applications is promising. The color accuracy of various calibration models were evaluated as applied to three commercial digital cameras for use in dental color matching. METHODS CIE LAB values of 264 color patches and 65 shade tabs were measured with a spectroradiometer. Digital(More)
The masking power of various generic, dry mineral earth, and flocking colorants dispersed in medical-grade silicone elastomer was investigated. Reflectance measurements were made by diffuse reflectance spectrophotometry using black and white backings. These data were reduced to optical scattering and absorption coefficients through the use of the(More)
The forces required to debond orthodontic attachments from porcelain veneer laminates were studied in vitro. Brackets were bonded to 160 veneered bovine incisor teeth before the determination of the debond force. The independent variables studied were resin type, priming agent, porcelain surface preparation, and debonding time. The average debond forces(More)
STATEMENT OF PROBLEM It remains unclear which shade guide system is most representative of the shades found in the human dentition. PURPOSE The purpose of this study was to determine and to compare the coverage errors (CEs) of 3 different shades in a selected population. MATERIAL AND METHODS The coverage errors of the following shade guide systems were(More)
STATEMENT OF PROBLEM Ceramic laminate veneers are generally fabricated with varying thicknesses ranging from 0.3 to 1 mm, depending on the need to mask discolored teeth or slightly correct the contour of malpositioned teeth. Clinical color reproduction poses a challenge because of color interaction with the underlying substrate, whether tooth structure or(More)
OBJECTIVE Purposes of this in vitro study include evaluating colour changes in combinations of feldspathic porcelain and cement resulting from different thicknesses of porcelain and different shades of composite luting agent, and evaluating relative translucency parameter (RTP) values. MATERIALS AND METHODS Porcelain discs of shade A1 at nominal(More)
PURPOSE This in vitro study was designed to evaluate the new ShadeEye-EX Chroma Meter and a new visual porcelain shade-matching system (Vitapan 3-D Master, Omega 900) in comparison to the traditionally used visual porcelain shade-matching system (Vita Lumin Vacuum, VMK 68). MATERIALS AND METHODS Shade matches and porcelain fabrications on individualized(More)
Edge-losses occur during reflectance measurements of pigmented maxillofacial elastomer when light is scattered within a sample beyond that part of the surface exposed to the observation system of the optical device. A custom sample-holder is presented which redirects light that would not be measured during conventional reflectance measurement back into the(More)