Continuous vs. discontinuous force application and root resorption

The aim of this study was to compare the effects on root resorption of cont inuous and discontinuous force application. The experimental material consi sted of 22 first premolars that were to be extracted as part of orthodontic treatment. Prior to extraction a 100 g tipping force was applied to the ex perimental teeth by means of elastics. One side was randomly selected to be the continuous force side, and the contralateral side became the discontin uous force side. Elastics were worn 24 hours per day on the continuous forc e side and 12 hours per day on the discontinuous side. The experimental pro cedure lasted 9 weeks. Composite electron micrographs of the buccal surface of each specimen were digitized and areas affected by resorption were dete rmined. The degree of root blunting was assessed by visual scoring. Mean pe rcentage of resorption-affected areas was smaller and apical blunting was l ess severe on the discontinuous force side. The results of this study show that the application of discontinuous force results in less root resorption than does the application of continuous force.