Cortical bone strains around straight and angulated immediate orthodontic microimplants: a pilot study
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Published on: October 18, 2021
Secil Cehreli1, Alev Yilmaz, Ayca Arman-Ozcirpici
1Department of Orthodontics, Faculty of Dentistry, Ordu University, Ordu, Turkey. secilcehreli@gmail.com
Purpose:
To measure strains around orthodontic implants upon torque tightening and loading and to assess correlations between factors influencing primary stability.
Materials And Methods:
Self-drilling implants were placed into bovine iliac crest blocks after CT assessments. Upon bonding of strain gauges on bone adjacent to the implants, strain measurements were performed using a data acquisition system during torque tightening and 250 g orthodontic force application by elastic chains.
Results:
The torque required to place straight implants (12.16 N.cm) was higher than 30- to 40-degree angulated implants (9.31 N.cm) (P < 0.05). Cortical bone strain amplitudes of both implant placements were comparable (P > 0.05). Strains during torque tightening of straight (196 με) and tilted (114 με) implants were higher than those obtained during orthodontic loading (20-30 με). Despite the positive and direct relationship found between torque and torque strain output, strong correlations between other parameters could not be detected.
Conclusion:
Vertically aligned and 30- to 40-degree angulated immediate orthodontic microimplants are associated with low amplitude strains upon torque tightening and orthodontic loading.
