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The Effect of Intermittent Forces on Eruption of the Rabbit Incisor

Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina 27514

K.T. Sellers

Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina 27514

Rabbits were prepared so that a variable capacitance displacement transducer (VCDT) could be used to monitor the eruptive movements of a previously-amputated lower incisor, and a strain gauge transducer mounted on a relay-controlled plate was used to place precisely controlled intermittent forces opposing the erupting tooth. Forces of one or three g were applied under time conditions of one second on, nine seconds off (1:9); one second on, three seconds off (1:3); and one second on, one second off (1:1). The data indicate that with force present for 10% of the time (1 :9), there was little or no effect on eruption rate. In contrast, 50% time (1:1) produced essentially the same intrusive effect as continuous force, and 25% time (1:3) gave an intermediate response. The data are consistent with the hypothesis that force duration is more important than force magnitude for the vertical equilibrium, as is the case for facio-lingual equilibrium.

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Journal of Dental Research, Vol. 65, No. 2, 118-122 (1986)
DOI: 10.1177/00220345860650020401


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