Experimental intrusion of rat incisors with continuous loads of varying magnitude.

Abstract

The present investigation deals with the relationship between continuous intrusive loads and the rate of intrusion of rat incisors. A method for the application of constant, defined loads by means of a closed coil spring is described. In seventeen rats the left mandibular incisor was shortened to prevent occlusion. The animals were exposed to direct light, medium, and heavy intrusive loads for a period of 12 days. Light loads (1.5 to 8.0 Gm./cm.2) did not cause active intrusion of the teeth. Medium loads (12.0 to 18.5 Gm./cm.2) initially elicited marked intrusion, followed by a short rest period after which the intrusive movement progressed steadily at a daily rate of about 25 micrometers. Heavy loads (30.5 to 32.0 Gm./cm.2) brought about active intrusion, which commenced only after 8 days of force application. The medium loads, having a magnitude in the range of rat systolic blood pressure, proved to be optimal for the intrusive movement.

Cite this paper

@article{Steigman1981ExperimentalIO, title={Experimental intrusion of rat incisors with continuous loads of varying magnitude.}, author={Shulamit Steigman and Yaeil Michaeli}, journal={American journal of orthodontics}, year={1981}, volume={80 4}, pages={429-36} }