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The miniscrew head could fracture from the neck of the shaft during removal. The authors recommend a minimum diameter of 1.6 mm for self-drilling miniscrews that are 8 mm or longer placed in dense cortical bone. The proper placement technique can minimize the risk of miniscrew fracture during its removal.
28 de may. de 2014 · As such, this in vitro study investigated fracture torques of commonly used self-drilling mini-implants. The present study showed that resistance to fracture varied significantly among implants from different manufacturers. The mean values obtained ranged from 25.08 Ncm (Aarhus) to 72.07 Ncm (Unitek). Comparison of the six manufacturers tested ...
1 de sept. de 2011 · Mechanical strength tests show that fixing bone in a formalin bath significantly reduces the mechanical fracture strength properties of the bone. 23 Because all bone samples in this study were uniformly fixed, we assumed that the relationship between placement torque and miniscrew resistance to movement under these conditions would be uniformly affected.
21 de feb. de 2020 · However, there can be complications with miniscrews, such as injury to the root and fracture of the miniscrew. Miniplates provide strong anchorage, have high success rates, a low probability of root damage, and low risk of fracture as advantages; however, the need for surgery and high cost are their disadvantages.
5 de jul. de 2018 · The sample included 10 unused specimens for each group, blocked in an Instron Universal Testing Machine, and a shear load was applied at the neck of the miniscrew. The force to bend the miniscrew was measured at 0.1 mm and 0.2 mm deflections. Also, the maximum force before screw fracture was recorded. Data were submitted for statistical analysis.
23 de may. de 2020 · Results: For Jeil miniscrew, no statistically significant differences were detected between the steam-sterilized and control groups in their insertion torques (P > 0.05).There was a statistically significant difference between the steam sterilized, dry sterilized and control groups with respect to their fracture torque (P < 0.001).For Hubit miniscrew, there were no significant differences ...
Following up in this issue of JCO, Dr. Ludwig's team presents guidelines for palatal miniscrew insertion. Using measurements from both radiographic and clinical anatomic studies, they plot out favorable insertion sites in the hard palate, both anterior and posterior. The authors' extensive review of the literature has led them to conclude that ...
