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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 ...
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.
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 ...
Miniscrew implants provide an excellent orthodontic anchorage. Besides the clinical benefits, miniscrew implants cause minor discomforts and in certain instances poses problematic complications. Damage to the adjacent tooth structure is the most feared complication of miniscrew implant placement, while fracture of miniscrew implants is the rarest.
11 de oct. de 2023 · This is due to their higher fracture resistance, ... Furthermore, the TR value of type C miniscrew was more than 1, indicating the MRT value was larger than the MIT value in the novel miniscrew.
1 de sept. de 2011 · The mean difference in miniscrew resistance to movement between maximum placement torque groupings, <5 Ncm, 5 to 10 Ncm, and >10 Ncm, increased throughout the deflection range of 0.0 to 0.6 mm. As deflection increased to 0.12 to 0.33 mm, the mean resistance to movement for miniscrews with maximum placement torque of 5 to 10 Ncm was statistically greater than for screws with maximum placement ...
24 de sept. de 2018 · Orthodontic miniscrew implants provide acceptable success rates that vary among the explored insertion sites. Low quality of evidence suggests that miniscrew implants inserted in palatal locations exhibit a failure rate of 1.3, 4.8 and 5.5% for the midpalatal, paramedian and parapalatal locations respectively.
