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Biomedical subjects

R L Cooley

Publications and source records attributed to R L Cooley.

At least 73 records · Page 4Linked to original sources
PubMed1980

Temperature rise in the pulp chamber caused by twist drills.

Pin channel preparations with twist drills have the potential to produce a temperature increase in the pulp chamber. This temperature increase is related to twist drill diameter, length (depth of channel preparation), and rotational speed.

Dental Instruments↗
PubMed1980

Variables associated with electric pulp testing.

A modern electronic pulp tester is evaluated in both the laboratory and clinical situations. Different electrode media are tested and compared to results obtained without any electrode media. Contact pads are also evaluated and found to add another variable to electric pulp testing. Several technique variables were introduced and found to have a significant effect on transmission of the stimulus to the tooth.

Dental Pulp↗
PubMed1979

Comparative evaluation of the 30-gauge dental needle.

The results of these tests demonstrated that aspiration through 30-gauge needles is possible, but since the flow rate is so diminished its clinical application is questionable. The evaluation of the physical properties of these needles proved them to be tough, durable, and suprisingly resistant to breakage, even under the most extreme manipulations and stresses. The insertion of needles into the plastic material clearly showed that the needles are always deflected toward the side without the bevel (the side that contains the point). Finally, the deposition patterns of the injected fluid in tissue have no relationship to the bevel.

Anesthesia, Dental↗
PubMed1979

Self-shearing retentive pins: a laboratory evaluation of pin channel penetration before shearing.

This laboratory study determined the depth reached by self-shearing pins in dentin pin channels. Pin channels were prepared with the self-limiting shoulder twist drill for each of the four systems tested. Mean channel depth reached for the various pin systems was: Stabilok (small), 2.31 mm; Stabilok (medium), 1.78 mm; Reten Pin, 1.40 mm; and TMS (Regular), 2.04 mm. A coparison was also made by calculating the mean percent of penetration in relation to the depth of prepared pin channel: Stabilok (small), 92.50%; Stabilok (medium), 63.62%; Reten Pin, 66.67%; and TMS (Regular) 81.75%.

Dental Instruments↗