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At least 775 records · Page 43Linked to original sources
PubMed1976

Accuracy of casts produced from alginate and hydrocolloid impression materials.

It is recognized that alginate impression materials have been used to obtain casts from which castings have been fabricated for a number of years. This study indicates that more dimensionally accurate casts are produced from hydrocolloid compared with casts produced from alginate. The most accurate casts were produced from the polyether impression material.

Alginates↗
PubMed1999

Trends in the dental health work force.

BACKGROUND AND OVERVIEW: Using data from various American Dental Association projects (Distribution of Dentists Survey, the Survey of Dental Practice, the Dental Workforce Model, and the Survey of Predoctoral Dental Educational Institutions), the authors analyzed trends and projections for the dental work force. The article presents work-force projections overall and by sex, when available, through the first 20 years of the 21st century. The number of women practicing dentistry has been increasing rapidly, while the increase in the number of male dentists has been more modest. In the future, the number of female dentists is projected to increase while the number of male dentists is projected to decrease. CONCLUSIONS: Estimates based on the ADA census data place the overall growth in the number of active private practitioners at 19.1 percent between 1982 and 1997. This growth signifies a substantial expansion of capacity to produce dental services in the United States. Growth will be slower in the future. PRACTICE IMPLICATIONS: Changes in the dental work-force capacity and demographic distributions merit careful monitoring and analysis, because they no doubt will determine the dental profession's future ability to deliver needed dental services and influence practitioners level of busyness.

Age Distribution↗
PubMed2001

Simulated shape design. Helping patients decide their esthetic ideal.

BACKGROUND: Esthetic care is changing dentistry from a need-based to a want-based practice. Patients are asking for esthetic treatment, and clinicians are retooling their practices to satisfy this need. One important part of providing esthetic dentistry is ensuring that the patient is as well-informed as possible about treatment outcomes. DESCRIPTION OF TECHNIQUE: This article describes a tool dentists can use to show patients potential tooth sizes, shapes and arrangements before carrying out treatment. Simulated shape design, or SSD, is a reversible method of demonstrating potential esthetic outcomes that involves creating trial restoration shapes and placing them over a patient's teeth. SSD is a simple technique that any dentist can perform. In essence, the technician makes new tooth shapes in wax, the dentist places these in the patient's mouth and the patient evaluates them. The dentist then makes modifications in the SSD, which he or she reports to the technician. CLINICAL IMPLICATIONS: With the decisions of shape, arrangement and size made at chairside, the whole flow of esthetic treatment can be handled smoothly. Preparations can be cut more accurately to better support the restorative material; decisions can be made to open or not open the contacts; and shapes can be agreed on in the earliest stage of evaluation, then duplicated faithfully in the provisional and final restorations. There are no surprises for the patient, the dentist or the technician. Both the esthetic (smile design) and functional elements (anterior guidance) of the restoration can be checked with SSD. SSD could become the standard in determining whether or not to proceed with esthetic treatment.

Cuspid↗
PubMed1998

The effect of disinfecting alginate and addition cured silicone rubber impression materials on the physical properties of impressions and resultant casts.

Four commercially available disinfectants were tested and the dimensional stability and detail reproduction of impressions and their resultant casts were measured according to ANSI/ISO specifications. Results showed that alginate impressions immersed in chlorhexidine exhibited considerable dimensional change if not poured immediately. Moreover, alginate impressions soaked in a paraldehyde agent (Virkon) for more than 2 minutes produced casts of inferior surface quality whilst those sprayed and left in contact with phenol derivatives (C&J Spray) for 30 minutes resulted in casts which demonstrated statistically and clinically significant dimensional changes. Addition cured silicone impressions exhibited minimal dimensional change regardless of the disinfection regime employed and the resultant casts were accurate with acceptable surface quality.

Alginates↗
PubMedDate not supplied

Strategies to achieve fit in implant prosthodontics: a review of the literature.

PURPOSE: This paper reviews the literature on advanced strategies that attempt to improve fit in implant prosthodontics with reference to the concept of the "distortion equation." MATERIALS AND METHODS: The majority of the articles reviewed were either clinical or technique articles that advocated strategies to improve fit in implant prosthodontics. A limited number of retrospective and prospective clinical trial studies were included as they related to the topic. Reviewed articles were limited to those that addressed advanced strategies to improve fit. All of the scientific studies included in this review used an in vitro experimental design. The advanced strategies were categorized into methods that address intraoral indexing and methods that use the implant master cast. RESULTS: Relatively few methods have been scientifically proven to improve fit in implant prosthodontics. Most of the tested strategies still resulted in a slight misfit of the frameworks to the implant abutments/analogues. CONCLUSION: Multiple factors preclude that the concept of "passive fit" can be achieved in implant prosthodontics, even with the use of advanced strategies. The use of meticulous, accurate implant prosthodontic procedures and the appropriate use of advanced strategies continue to be the recommended means of achieving precise fit of the implant prosthesis to the intraoral abutments.

Animals↗