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Biomedical subjects

D Assif

Publications and source records attributed to D Assif.

At least 37 records · Page 2Linked to original sources
PubMed1989

Photoelastic analysis of stress transfer by endodontically treated teeth to the supporting structure using different restorative techniques.

A photoelastic model was used to examine the influence of different types of restorations placed following endodontic therapy, emphasizing the way in which forces applied to the occlusal surface were dispersed to the supporting structures of the teeth. Stresses were photographed in the polarized light field. Findings indicate that distribution and patterns of stresses vary depending on the direction of the loads and the nature of the involved restorative procedures.

Bite Force↗
PubMed1989

Diagnostic casts--an additional dimension.

The indications and usefulness of diagnostic casts are well documented in the literature. A method is presented that enables increased access to the lingual aspect of the casts by sectioning them in a midsagittal plane. The sectioned portions are held together in maximum intercuspation by acrylic keys. The interdigitated casts can thus be examined from all aspects, thereby deriving maximum benefit from them.

Acrylic Resins↗
PubMed1988

A new electromechanical device to measure the accuracy of interocclusal records.

A new electromechanical device was developed for measuring vertical dimension. This device monitored accuracy and vertical displacement of various dental materials during the transfer of interocclusal relationships to an articulator. Polyether was the most precise material tested. Its accuracy was in the 20 to 30 micron range and also recommended for use because of other desirable characteristics. The accuracy of the remaining materials from displacement were, in descending order, Dura-Lay acrylic resin, wax, and wax plus zinc oxide. The electromechanical system was tested and verified as accurate, reliable, convenient, and easy to use.

Acrylic Resins↗
PubMed1986

Retention of serrated endodontic posts with a composite luting agent: effect of cement thickness.

When Prosthodent composite was used as a cementation material for endodontic posts (ParaPost), adaptation of the post to the canal was not crucial. Changes of the composite layer thickness up to 500 microns did not decrease retention. Variation in the diameter of the posts did not effect the retention. The retention obtained for the combinations of posts and cements was high and suitable to resist dislodgment of the posts. Consequently, the thinnest post in the root canal, cemented with a composite is recommended. Thus the removal of tooth structure is unnecessary because the cylindrical preparation is formed in the composite.

Composite Resins↗
PubMed1982

Effect of turbine dental drill noise on dentists' hearing.

The effect of high-speed dental turbines on dentists' hearing was investigated. The two types of dental turbines used most commonly in the Tel Aviv area and their average time of daily use were established by means of questionnaires. The noise pressure level of these turbines at a distance of 30.0 cm was measured. Twenty subjects were exposed to the turbine noise for a period equal to the average time of the drill's daily use. The noise pressure levels of the turbines were found to be nonhazardous by the accepted damage-risk criteria. The temporary threshold shifts of the subjects exposed were nil or insignificant. It was concluded that the risk of damage to the dentist's hearing due to dental turbine noise in the normal course of a working day is slight.

Auditory Fatigue↗