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Results for “DENTAL APPARATUS”

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At least 523 records · Page 29Linked to original sources
PubMed1978

[Tear resistance of laser-welded dental alloys].

The investigation was undertaken to establish the place of lasers as tools in the dental technical laboratory. Tests were undertaken to study resistance to tears in laser welded dental metal alloys. (Degudent U, Degulor M of Fa. Degussa.) Availabel as laser apparatus were a cw Nd:YAG-laser (400 Watt capacity) and a pulse Nd:YAG-laser (max. 45 pulse energy, 9.2 pulse length). Welding tests on models with both lasers resulted in higher resistance to tears than was achievable by conventional soldering processes. Furthermore it could be shown that in certain alloy compositions, used in our experiments, welding by the cw process resulted in greater resistance to fissuring than by the pulse process. By adopting the alloy as well as the preparation of appliances to the laser process we feel that markedly superior results can be achieved as we describe in this first communication.

Dental Alloys↗
PubMed1997

A substitute for facial replica in mannequin procedures.

The use of mannequin exercises has been a teaching tool in the education of dental students. Various commercially available materials to simulate extraoral facial structure form part of this apparatus, also called a "phantom head." It is not always practical, with cost considerations, to replace this external component when unavoidable wear and tear occurs. An alternative that uses a recycled milk carton is presented as an inexpensive substitute.

Dental Prosthesis Design↗
PubMedDate not supplied

Feeding disorders research and teams: a new challenge for dentistry.

Feeding disorders, which include masticatory and cerebral disabilities, present a major problem for disabled persons, but only in the last decade have health professionals shown an increased interest in the diagnosis and management of patients with such problems. Dentists are experts in the diagnosis and treatment of disorders of the oral-facial region, yet they have either worked in intradisciplinary isolation or have not demonstrated their interest in patients with feeding disorders. Consequently, those involved in the assessment and treatment of persons with feeding disorders are not aware of the contributions dentists have made to the basic and clinical data base of feeding assessment and therapy. Dentistry is simply not mentioned in rehabilitation. The opportunity now exists for dentistry to inform others of our expertise in the field from both a research and a clinical perspective. The basic and clinical base of dental therapeutics and its role in the diagnosis and treatment of disorders of the masticatory apparatus and of swallowing are reviewed here. It is hoped that this review will stimulate interest among dentists to take part in the rehabilitation of patients with feeding disorders through the use of the extensive data base within the profession.

Deglutition Disorders↗
PubMed1987

Physical model for non-steady-state dissolution of dental enamel.

The purpose of this study was to provide a rigorous theoretical understanding of the dissolution behavior of dental enamel over the entire time-course of demineralization and to simulate by computer an erosion-type caries lesion according to the physical "hydroxyapatite model". The appropriate diffusion equations which account for simultaneous diffusion and equilibrium of all species in enamel pores, boundary layer, and bulk solution, and which also take into consideration surface reaction kinetics, were employed to allow for calculation of the micro-environmental solution concentration and changes in the mineral density as a function of time and distance within the enamel. This comprehensive physical model for non-steady-state enamel dissolution also explicitly takes into account changes in the diffusivity and the dissolution rate constant as a function of mineral density. Demineralization experiments were conducted in 0.1 mol/L sink acetate buffer (pH = 4.50, mu = 0.50), with ground bovine dental enamel blocks of known surface area mounted (with beeswax) in a rotating disk apparatus. Mineral density profiles were quantified by means of contact x-ray microradiography. The physical model was used to predict mineral density profiles for given demineralization treatments. The experimental profiles agreed quite well with the predicted profiles, when the effective diffusivity of the enamel was assumed to be a function of porosity and when changes in surface area of the crystallites were taken into consideration.

Animals↗
PubMed2002

[Profession-related disorders of the locomotor apparatus. A multi-causal problem?].

This article provides information on the prevention of disorders among dentists and dental hygienists, for instance neck, shoulders, upper extremity, wrist and hand disorders. Many daily (strained) operating postures are described, and research data from the Sonde prevention project is mentioned. This data is compared with the newly implemented NEN-ISO-standard 11226. The standard lists the limits of static working postures. It becomes clear from this data that many dentists exceed these limits daily and work in overstrained postures. The article will further go into the complicated interrelationship of and connection between various interactive factors which intentionally and often unintentionally lead to static use of muscles. It may be a matter of cumulative effects that are multi-causally related, with the possible consequences. A further awakening within the dental profession, conditioning of young students into adopting a correct operating posture and purchasing ergonomically sound equipment may contribute to a healthier situation.

Dentistry↗
PubMed1995

Evidence of two types of odontoblasts during dentinogenesis in elasmobranchs.

The fine structure of the odontoblasts in the sting rays, Dasyatis akajei, Dasyatidae, and Urolophus aurantiacus, Urolophidae, was examined using light and transmission electron microscopy. In the dentinogenesis stage, the odontoblasts have been classified into two types, that is, dark cells and light cells, based on differences in their fine structure. Many dark odontoblasts found along the predentine displayed well-developed organelles with secretory activity around the nuclei. They contained large amounts of expanded rER, widely distributed Golgi apparatus and secretory granules. In contrast, light odontoblasts showed a relatively clear cytoplasm and extended long processes which passed through the predentine and penetrated into the dentine. They contained large numbers of microtubules in the processes and many mitochondria around the nuclei. It is suggested that the light odontoblasts play an important part in material transport to the dentine and/or act as a sensory organ of the tooth. The dark odontoblasts seem to produce the organic matrix of the dentine and to prepare for mineralization in the dentine.

Animals↗