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At least 1,027 records · Page 57Linked to original sources
PubMed2000

Tooth colour analysis by a new optoelectronic system.

The difficulties in assessing and comparing tooth shades are well documented. This pilot study introduces an alternative method of photoelectric tooth colour measurement, the silicon photodiode array apparatus. This apparatus was used to determine colorimetric values for samples of acrylic resin teeth and the results compared with colour values obtained using a conventional photoelectric tristimulus colorimeter. Whilst a significant difference was found between some colorimetric data produced by the two types of apparatus for the same sample these differences existed purely at the mathematical level and would not be perceived by a human observer.

Acrylic Resins↗
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↗
PubMed1999

[Removable prosthesis: masticatory efficiency].

The late consultation in odontology often leads to tooth extraction. This negligence, in a long term, will cause complete toothlessness. This state of invalidity will be compensated by prosthesis. The removable prosthesis is often indicated because of the cost price. It is the result of a successful therapeutics, only if it fits aesthetically and functionally, within a chewing efficiency. In a first part, we will define masticatory efficiency, as different from masticatory capacity and capability. Then, in a second part, through some experimentation, we will show how fundamental research can guide the practitioner in his prosthetics choices and assessments.

Dental Materials↗
PubMed2000

Three-dimensional shade analysis: perspectives of color--Part II.

In addition to outlining the fundamental principles of color and its qualitative and quantitative measurement, the first part of this article explained the chemical, physical, physiological, and psychological realization of color. To complete this discussion, the second part focuses on numerous variables that affect shade determination in the clinical chromatic environment. A contemporary shade selection system is also presented, and its systematic approach and limitations when utilized in a laboratory or clinical environment are detailed.

Adult↗
PubMedDate not supplied

Tooth color selection and characterization accomplished with optical mapping.

Due to rising patient expectations and recent developments in material composition and clinical techniques, the demand for restorations that replicate the natural dentition has increased significantly. It is imperative that clinicians and dental technicians develop the communication skills necessary to ensure predictable and reliable shade reproduction. This article defines tooth color and its optical properties while describing techniques for the accurate translation of these characteristics into a laboratory prescription form that utilizes optical mapping procedures.

Color↗
PubMed2000

A biometric guide to prosthetic tooth positioning investigated in subjects with Class II division 2 incisor relationships.

A biometric guide for positioning of the maxillary central incisors in complete dentures is the incisor-incisive papilla distance. This distance was compared in dentate subject with either Class I or Class II/2 incisor relations. Maxillary casts were orientated parallel to the occlusal plane on an xy table, connected to a movable vertical arm. The distance from the posterior edge of the papilla to the labial incisor surface was measured. Results showed a mean difference of 2 mm between the groups, significant at the P < or = 0.001 level, however this distance would not appear to invalidate the conventional biometric guideline of 10 mm.

Adult↗
PubMed2000

Development and laboratory evaluation of a new toothbrush with a novel brush head design.

Despite many developments in manual toothbrush design, plaque removal at the back of the mouth and at approximal surfaces remains inadequate, yet it is at these sites in particular that plaque accumulates and leads to the development of gingival disease. Improved oral hygiene can be achieved by better brushing technique and by increasing brushing time, but a change in behavior patterns is almost impossible to achieve for the majority of individuals. What is required is a brush head design that maximizes plaque removal, regardless of how the user brushes. As a result of a detailed investigation into the action of bistles during brushing, the Oral-B CrossAction toothbrush has been developed. It incorporates bristles angled at 16 degrees in a unique CrissCross design arranged along the horizontal axis of the toothbrush. Laboratory studies have demonstrated that this development significantly enhances interproximal penetration and cleaning effectiveness when compared with an identical brush head with vertical rather than angled bristles. Laboratory comparisons with more than 80 leading manual toothbrushes from around the world demonstrate a consistent, significant advantage for the new CrossAction toothbrush, both with respect to interproximal penetration and cleaning effectiveness. These results suggest that the CrossAction toothbrush has the potential to remove greater amounts of plaque, especially from the approximal surfaces, than conventional toothbrushes incorporating vertical bristles or more traditional tuft designs.

Adult↗
PubMed1999

Use of a common shade guide to test the perception of differences in the shades and value by members of the dental team.

PURPOSE: Commercial shade guides are frequently used for treatments where the shades of teeth are being reproduced or altered. Where differences between shade tabs and the natural teeth are small, difficulty is often experienced in determining the closest match. The purpose of this investigation is to discover whether the claimed colour differences between individual shades of one commonly used guide can be determined subjectively in clinical circumstances. BASIC PROCEDURES: Seventy dental team professionals made shade comparisons in an idealized colour-matching environment using shade guides as supplied by the manufacturer. Their arrangements by 'value' were recorded and unidentified shade tabs were matched with those on a complete guide. MAIN FINDINGS: The results showed that discrepancies existed between nominated and perceived colours, for the shade determination system tested. The shade-guide manufacturer's recommended arrangement of shade tabs ranked according to colour 'value' did not correspond to subjective perception of 'value' ordering under the conditions of the study. PRINCIPAL CONCLUSIONS: There may be no practical clinical advantage in having shades which cannot be distinguished. This study indicates that colour differences between shade tabs are not clearly perceived by members of the dental team. A careful reduction of the number of tabs in the guide tested might simplify shade selection procedures and help to standardise shade-taking.

Color↗
PubMedDate not supplied

A study of the use of photographs for denture tooth selection.

PURPOSE: The aim was to examine a method described by Wehner et al for calculating the width of a missing central incisor using preextraction photographs. MATERIALS AND METHODS: Three photographic views were obtained for each of 30 dentate subjects: full face, oblique, and reduced-size full face. The width of the maxillary right central incisor (MR1) was calculated using a formula. The difference between the actual width and calculated width of MR1 was determined for each subject. The median difference and interquartile range were determined because the data were skewed. RESULTS: The width of MR1 calculated using the larger full-face view was typically smaller than the actual width, with a median difference of -0.18 mm. The interquartile range of the difference was from -0.42 to 0.05 mm. For both the oblique and reduced-size views, the calculated width was typically larger, with a median difference of 1.19 mm with an interquartile range from 0.82 to 1.76 mm and a median difference of 0.84 mm with an interquartile range from 0.59 to 1.41 mm, respectively. CONCLUSION: The technique described by Wehner et al is of proven value in calculating the width of a central incisor when the only available evidence is a preextraction photograph. However, it is of value only when the photograph is a full-face portrait of sufficient size.

Dental Prosthesis Design↗
PubMed2002

Space analysis in fixed prosthodontics--normal parameters.

Partial edentulism is a common clinical situation encountered by dentists in their daily practice. If left untreated, the early loss of molars or any other tooth often leads to migration of the neighboring teeth, leaving abnormal edentulous spaces to be restored. In this article, guidelines are described for analyzing simple and complex edentulous spaces as well as how to determine the size of pontics to be used through a simple sequence of steps. Within the context of this article, clinical examples are shown that illustrate the simple, normal parameters of this technique, which is also applicable to more complex restorative situations.

Denture Design↗
PubMed2001

The all-ceramic cantilever bridge: a variation on a theme.

All-ceramic crowns have become a dependable treatment modality. As a result, there is interest in expanding this modality to all-ceramic bridge-work. This article describes a modification of the CAD/CAM all-ceramic Procera technique, which allows the fabrication of a single-unit cantilever ceramic bridge using existing equipment and procedures. The stress-bearing areas of the bridge are made of densely sintered high-purity alumina without ceramic-fusing material. Although the indications for this bridge are limited, this technique adds to the dentist's armamentarium of esthetic restorations.

Aluminum Oxide↗
PubMed2001

Immediate total tooth replacement.

Successful implant placement at the time of extraction has been documented. Implant placement at the time of extraction was initially performed as a two-stage procedure often with barrier membranes and sophisticated second-stage surgical uncoverings. The authors describe the next generation of this technique, including atraumatic tooth removal with simultaneous root form, implant placement, and temporization at one appointment. This technique of "Immediate Total Tooth Replacement" allows for the maintenance of the bony housing and soft-tissue form that existed before extraction, while at the same time establishing a root form anchor in the bone for an esthetic restoration.

Dental Implantation, Endosseous↗