Abstract
The purpose of this research was to compare insertion techniques and effects on mechanical and clinical parameters between 2 types of miniscrews. Forty-four consecutive patients whose orthodontic treatment involved the use of miniscrews (miniscrew A [MA] and miniscrew B [MB]) for anchorage were included in this study. Miniscrews were placed with predrilling or self-drilling; peak maximum insertion torque (MIT) and Periotest values were measured. Cone-beam computed tomography was performed after the insertion of miniscrews and root proximity determination; cortical bone thickness was also analyzed. Periotest values were measured after the application of orthodontic force. Self-drilling produced higher Periotest values (P<0.01) for MA and higher MIT (P<0.01) for MB with closer root proximity (P<0.05). MB had higher MIT and Periotest values with drilling compared with MA (P<0.05); MB also showed closer root proximity (P<0.05). Successful miniscrews had lower MIT (P<0.05) for MB and lower Periotest values (P<0.01) for both MA and MB, with significantly more distant root proximity (P<0.01). Self-drilling produced higher Periotest values at the time of placement (P<0.01) and after 4 weeks (P<0.05) in MA. Drilling produced higher Periotest values for MB at the time of placement (P<0.05). MIT had positive correlations with Periotest values for MB with self-drilling (P<0.01) and with root proximity for MA with drilling (P<0.01). Periotest values had negative correlations with root proximity for MA and the MB group with drilling (P<0.01). For miniscrews with larger diameters, higher MIT may result in more mobility (higher Periotest values). Drilling can avoid root contact and enhance primary stability, thus producing lower Periotest values.
Published Version
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