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Results for “Prosthesis Coloring”

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At least 721 records · Page 40Linked to original sources
PubMed2000

Sharing ideas.

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Color↗
PubMed2001

Digital shade analysis and verification: a case report and discussion.

Shade analysis and selection requires the accurate and objective evaluation of hue, chroma, value, characterization, and translucency. Conventional shade analysis techniques using shade tabs often result in the subjective analysis and miscommunication of color. Digital shade analysis systems have been designed to eliminate the subjectivity of color analysis and provide exact information for laboratory buildup and fabrication. The advent of digital shade analysis can facilitate the precise and uniform fabrication of aesthetic restorations by technicians at all levels of color expertise.

Color↗
PubMedDate not supplied

Histologic comparison of a thermal dual-etched implant surface to machined, TPS, and HA surfaces: bone contact in vivo in rabbits.

PURPOSE: To evaluate the bone contact percentage around a proprietary high-temperature dual-etched (DE) implant surface (Osseotite) versus implants with machined, hydroxyapatite (HA), and titanium plasma-sprayed (TPS) surfaces. MATERIALS AND METHODS: Each implant type was placed in rabbit tibiae of the same animal and assessed at 1 to 8 weeks. Histologic sections were prepared and analyzed histomorphometrically. RESULTS: The DE implant surface achieved higher levels of bone contact percentage than the other surfaces. This enhanced contact level was apparent by 3 weeks and seen at all time intervals except 2 weeks, at which machined exceeded the DE mean. In evaluating which surface outscored the others in each individual rabbit, there was a statistically significant confidence for the DE surface (P < .001). The other 3 surfaces failed to show significance, although the numeric scores for the TPS surfaces were below random expectations and the machined scores were slightly above. There was no correlation between degree of roughness and bone contact percentage. DISCUSSION: Arbitrarily roughening the implant surface may not result in a large change in bone conductivity. The specific texture of the DE process yielded more contact, possibly as the result of better fibrin clot retention and growth factor enhancement. CONCLUSIONS: There was no advantage demonstrated in this model to an HA surface over titanium. The bone contact to the rough HA surface scored similarly to that for the TPS surface of similar roughness, and well below that for the DE titanium surface. The DE surface appeared to have an advantage in bone contact percentage, particularly in early healing in a rabbit tibia model.

Animals↗
PubMedDate not supplied

An 11-year clinical evaluation of leucite-reinforced glass-ceramic crowns: a retrospective study.

OBJECTIVE: The purpose of this study was to retrospectively evaluate leucite-reinforced glass-ceramic crowns placed over a 6-year period at two different private dental practices. METHOD AND MATERIALS: One hundred twenty-five Empress crowns were placed in 54 patients. The 93 anterior and 32 posterior crowns were evaluated clinically with a mirror and probe, radiographically, and from clinical photographs, in accordance with a modified California Dental Association and Ryge quality evaluation system. The risk of fracture was determined with the Kaplan-Meier survival analysis. RESULTS: Crowns were studied over periods ranging from 4 to 11 years. The probability of survival of the 125 crowns was 95.2% at 11 years (98.9% in the anterior segment and 84.4% in the posterior segment). Six crowns had to be replaced. Most of the 119 successful crowns were rated excellent; Alfa ratings were assigned to 94.2% for color match, 91.6% for porcelain surface, 86.6% for marginal discoloration, and 94.2% for marginal integrity. CONCLUSION: Leucite-reinforced glass-ceramic crowns showed a low clinical failure rate and excellent esthetics after up to 11 years.

Adolescent↗
PubMedDate not supplied

An intraindividual clinical comparison of two metal-ceramic systems: a 5-year prospective study.

PURPOSE: Earlier studies on low-fusing ceramics have shown the occurrence of changes over time regarding surface and color. The present prospective study is an ongoing follow-up of an intraindividual comparison between two metal-ceramic systems, the Procera system (titanium copings veneered with a low-fusing ceramic) and noble-alloy copings veneered with a medium-fusing ceramic. MATERIALS AND METHODS: Twenty-one crown pairs were fabricated for 18 patients. After 5 years, 18 crown pairs in 15 patients were available for comparison. The crowns were examined shortly after cementation (baseline), and after 1, 2, and 5 years. The crowns were rated according to the CDA system. Bleeding index and margin index were also evaluated. RESULTS: Obvious changes regarding surface and color were noted for the titanium-ceramic crowns. The difference between the two types of crowns was statistically significant at 5 years (P = .004). The differences between the two systems regarding anatomic form, margin integrity, bleeding index, and margin index were small. CONCLUSION: Within the limitations of this study, it is concluded that low-fusing ceramic-veneered titanium copings are inferior to medium-fusing ceramic-veneered conventional copings regarding surface and color of the ceramic. Therefore, conventional ceramic-veneered crowns seem to be preferable, at least in the anterior area, where the esthetic requirements are greater than in premolar and molar regions. Whether possible changes in the properties of low-fusing ceramics will reduce the differences between the two types of metal-ceramic crowns remains to be proven.

Adult↗
PubMed2006

Rhabdomyolysis.

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Adolescent↗
PubMedDate not supplied

The relationship between elastomer opacity, colorimeter beam size, and measured colorimetric response.

The effect of opacity on the colorimetric responses of large-area and small-area colorimeters was determined using an elastomer intended for maxillofacial prosthetics use and containing various pigments at different concentrations. Opacity was determined by calculating the contrast ratio of 2-mm-thick specimens against black and white backings, using Kubelka-Munk analyses to correct for thickness and backing color variations. The measure of comparison of the two colorimeters was the relative difference in tristimulus reflectance, with the tristimulus reflectance of the large-area colorimeter as the basis of the relative difference. A significant quadratic relationship was found between contrast ratio and the relative difference in tristimulus reflectance. This relationship may be used to describe opacity without the need to make optical observations or measurements of a thin layer of material on contrasting backings. The small-area colorimeter produced color parameters that are a measure of the combined effects of both color and opacity. The importance of beam size considerations of optical measuring devices for translucent natural and prosthetic materials was emphasized.

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