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Biomedical subjects

J B Moser

Publications and source records attributed to J B Moser.

At least 37 records · Page 2Linked to original sources
PubMed1984

The hardness of composites as a function of temperature.

The microhardness of conventional, posterior and microfil composites were measured as a function of temperature in an aqueous environment. With the exception of one posterior composite and two microfils, the composites suffered dramatic decreases in hardness (of the order of 30-50%) over temperature intervals corresponding to that encountered in oral service. In those systems which did not display hardness changes, interactions between glass and matrix as well as enhanced filler packing may be important.

Chemical Phenomena↗
PubMed1982

Forces and efficacy in endodontic irrigation systems.

Measurements of the pressure necessary to activate three commercially available types of endodontic irrigation systems were obtained from an in vitro testing procedure. In addition, the irrigation process was observed in simulated 1 mm. diameter root canals prepared in clear acrylic. Except for one patented system, the force necessary to depress the plunger of an irrigation syringe was found to increase as the size of the needle decreased. the most effective irrigation was observed when the larger needles of a blunted, open-end design were inserted to the full length of the preparation.

Dental Pulp Cavity↗
PubMed1981

Working and setting times of root canal sealants determined by the oscillating rheometer.

The working and setting times of medium and long setting endodontic root canal sealants can be determined by the oscillating rheometer. Values more closely related to clinical observations are obtained when intermittent action of the rheometer drive is employed (3 oscillations every 5 minutes). The modification to the apparatus needed is described and results of tests with and without the modification are presented. These indicate that the oscillatory movement, although slight, does continue the mixing process yielding reduced values for working and setting times.

Chemical Phenomena↗
PubMed1981

Rheology of composite restoratives.

The components of Adaptic and Nuva-fil have been found to be the most viscous, while those of Concise were found to be the least viscous. The viscosity of setting systems revealed Adaptic to be the most viscous overall and Profile the least. All components and setting materials were shown to be pseudoplastic, with flow properties most likely controlled by the resin phase. The cone and plate have been found to be a feasible method for working time determination, with Profile having an extended working period, compared to the other systems tested.

Composite Resins↗