Effect of Predrilling Diameter on Orthodontic Miniscrew Primary Stability
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Abstract
Background: Predrilling diameter is a factor that is associated with miniscrew primary stability. However, no studies have reported on the relationship between predrilling sizes and shear force loaded as anchorage during orthodontic treatment. Objective: The purpose of this study was to evaluate the effect of 0.70, 0.80, 0.90, 1.00, 1.10, and 1.20 mm predrilling sizes on insertion torque and shear test using 1.30-mm diameter miniscrews in 1-mm thick synthetic cortical bone. Materials and methods: Insertion torque was recorded using a torque driver. The shear test was performed using a universal testing machine by loading a tangential force perpendicularly to the miniscrew at 1 mm/min until it was displaced by 0.50 mm. Results: Overall, the insertion torque tended to significantly decrease as the predrilling diameters increased. The exceptions were in the 0.70 and 0.80 mm groups that had insertion torque values lower than those in the 0.90 mm and 1.00 mm groups. Regarding the shear test, although there were no significant differences among the groups, the 1.20-mm predrilling diameter group demonstrated a much lower value, suggesting that it might be easier to dislodge after receiving an orthodontic force. Conclusion: Predrilling diameter size up to 77 % of the 1.30-mm outer diameter miniscrew can be used to achieve optimal orthodontic miniscrew primary stability.
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