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Abstract
A cantilever beam strain-gauge transducer was used to apply continuous light intrusive loads (0.2–0.4 and 2.5 g) to unimpeded mandibular incisors. Tooth position was continuously monitored using a variable capacitance displacement transducer. After 4 days of unimpeded eruption, the animals were divided into three experimental groups: no axial loading (6 rabbits); 0.2–0.4 g of axial loading (3 rabbits); 2.5 g of axial loading (3 rabbits). During a 4-h period, light forces (0.2–0.4 g) slowed eruption to a stop, whereas a heavier force (2.5g) intruded the teeth. The data support Burn-Murdoch's (1981) ( Archs oral Biol. 26, 939–943) contention that the eruptive force of unimpeded continuously-erupting incisors is significantly less than previously thought.
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