Abstract
ObjectiveThe aim was to investigate the effect of mechanical vibration on root resorption with or without orthodontic force application.Material and methodsTwenty patients who required maxillary premolar extractions as part of orthodontic treatment were randomly divided into two groups of 10: no-force group and force group. Using a split-mouth procedure, each patient’s maxillary first premolar teeth were randomly assigned as either vibration or control side for both groups. A buccally directed vibration of 50 Hz, with an Oral-B HummingBird device, was applied to the maxillary first premolar for 10 min/day for 12 weeks. After the force application period, the maxillary first premolars were extracted and scanned with micro-computed tomography. Fiji (ImageJ), performing slice-by-slice quantitative volumetric measurements, was used for resorption crater calculation. Total crater volumes were compared with the Wilcoxon and Mann–Whitney U tests.ResultsThe total crater volumes in the force and no-force groups were 0.476 mm3 and 0.017 mm3 on the vibration side and 0.462 mm3 and 0.031 mm3 on the control side, respectively. There was no statistical difference between the vibration and control sides (P > 0.05). There was more resorption by volume in the force group when compared to the no-force group (P < 0.05).ConclusionMechanical vibration did not have a beneficial effect on reducing root resorption; however, force application caused significant root resorption.
Highlights
Induced inflammatory root resorption (OIIRR) is an important negative sequela and undesirable risk of orthodontic treatment [1, 2]
Mechanical vibration did not have a beneficial effect on reducing root resorption; force application caused significant root resorption
Other studies found no evidence that mechanical vibration can significantly increase the rate of tooth movement [15,16,17] or reduce pain resulting from the orthodontic force [18, 19]
Summary
Induced inflammatory root resorption (OIIRR) is an important negative sequela and undesirable risk of orthodontic treatment [1, 2]. The practice of mechanical vibration with orthodontic treatment has been recommended as a way to reduce the duration of treatment and root resorption, but there is inadequate evidence to support this claim [8]. Darendeliler et al [12] and Nishimura et al [13] used mechanical vibration in orthodontic practice and stated that the rate of tooth movement was accelerated with mechanical vibration. It was suggested that mechanical vibration reduces pain caused by orthodontic force [12, 14]. Other studies found no evidence that mechanical vibration can significantly increase the rate of tooth movement [15,16,17] or reduce pain resulting from the orthodontic force [18, 19]
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