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At least 235 records · Page 13Linked to original sources
PubMedDate not supplied

An apparatus for measuring the rheological properties of dental materials.

An indirect extrusion capillary viscometer has been developed. This has been tested for nonsetting Newtonian fluids and was found to give results close to, but slightly lower than the actual viscosity. The same apparatus has been successfully applied to a non-Newtonian fluid to determine the dependence of viscosity on shear rate. The technique described should meet the requirements for assessing the rheological characteristics important in the mixing and setting of dental materials. The developed viscometer must be coupled with a sensitive mechanical testing machine capable of an adequate range of crosshead speeds that can be changed rapidly. By obtaining force vs time curves at different shear rates for setting materials, viscosity can be calculated as a function of time. Also, the viscosity at any given time during the setting process can be calculated as a function of shear rate. This chould be of aid in the interpretation of changes in rheological properties during setting of dental materials.

Dental Materials↗
PubMedDate not supplied

[An orthodontic apparatus for treating distal occlusion of the dental arches].

To cut down the period of orthodontic treatment, achieve better effects, and normalize the function of the tongue, an orthodontic device is suggested, which consists of a plate for the maxilla with a palatine clasp and an active wire element of a symmetrical arch-shaped design, welded in the plate, which affects the lower dentition during dentition occlusion.

Activator Appliances↗
PubMed1998

Learning a clinical method to identify a mandibular reference position.

The teaching of clinical maxillomandibular relationships is an area of weakness in dental school curricula. Most difficulties arise when a reference position is required to adjust or reconstitute the maximum intercuspation of the dentition. The dentist-derived concept of the centric maxillomandibular relation position is used to solve this problem. There is no consensus on the definition of this term. In the descriptions of clinical technique for recording the centric maxillomandibular relation position, clinical criteria to judge whether or not the position required has been achieved usually are not given. The dorsal border paths of the envelope of movement were used to develop a clinical criterion to identify the centric maxillomandibular relation position. Force or "guidance" is not used in this method. Test-patients with normal masticatory systems were randomly selected and fitted with a mechanical tracking apparatus. 50 undergraduate dental students and dental nurses were randomly selected and given instruction in the clinical technique to identify the centric maxillomandibular relation position. The ability of these students to identify the reference position was assessed by having them perform the technique blindfolded on the test-patients on whom tracking apparatus was fitted. Sixty eight percent of the test-clinicians succeeded in using the method to identify the reference position. There was no significant difference in the abilities of subgroups to use the method successfully, e.g., women compared to men, 2nd year students to 3rd year students. It was concluded that the method was a satisfactory way of learning how to identify the centric maxillomandibular relation position in a gentle, non-invasive fashion.

Curriculum↗
PubMed1990

[Automatic polishing of dental prostheses. 1. Development of a centrifugal barrel finishing apparatus].

A centrifugal barrel finishing apparatus with a variable turn table rotational speed (250-1,000 rpm) was newly developed and barrel finishing of Ni-Cr casting plates (10 x 10 x 2 mm) was performed using alumina base chips. When using the sample with a mirror face the amount of polishing and the surface roughness increased and the surface gloss decreased with the increase in rotation speed. A high rotational speed was useful for coarse polishing and low rotational speed was useful for fine polishing. The continuous barrel polishing was trially performed using the sample prepared by the carborundum wheel under variable rotational speed. Automatic polishing to fine polishing could be done using this apparatus.

Dental Polishing↗
PubMed1979

Dental dolorimetry for human pain research: methods and apparatus.

Electrical stimulation of human tooth pulp provides a means of safely producing human pain in the laboratory. This paper describes a dolorimetry and data collection system for stimulating volunteers, recording responses and analyzing data. The system allows multilevel stimulation in pseudorandom sequences and analysis of results using the methods of Sensory Decision Theory. It consists of modified commercial equipment, specially designed circuitry, an interface, and a programmable calculator. Fundamental problems and safety considerations for electrical dental stimulation are reviewed. Reliability of stimulation and response measurement is discussed.

Clinical Trials as Topic↗