Abstract
Temporary anchorage devices (TADs) have been introduced into orthodontic clinical practice in order to allow tooth movements while avoiding strain on adjacent teeth. Miniscrews are available in the market with different diameters and materials. Accordingly, the purpose of the present report was to measure and compare the forces to bend and fracture different mini implants. Ti-6Al-4V titanium and stainless steel TADs of different manufacturers (Spider ScrewHDC; Mini Implants–Leone; Benefit–Orteam; Storm–Kristal) were evaluated. Two different diameters (1.5 mm and 2.0 mm) were tested. 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. Results showed significantly higher forces for 2.0 mm than 1.5 mm screws, both at 0.1 mm and 0.2 mm deflections and at maximum load. Moreover, no significant differences were reported between titanium and stainless steel miniscrews of equal diameters.
Highlights
During orthodontic treatment, excessive forces have been associated with undesirable reactions and side effects, including bone hyalinization, root resorption, pain, patient discomfort, and anchorage loss [1]
Previous studies that investigated the clinical reliability of orthodontic miniscrews showed their
Previous studies that investigated the clinical reliability of orthodontic miniscrews showed their effectiveness for for skeletal skeletal anchorage anchorage in in orthodontics, orthodontics, with effectiveness with aa high high success success rate rate
Summary
Excessive forces have been associated with undesirable reactions and side effects, including bone hyalinization, root resorption, pain, patient discomfort, and anchorage loss [1]. Orthodontic miniscrews have been introduced as temporary anchorage devices (TADs): they allow skeletal anchorage for dental movements, decreasing the side effects of anchorage loss. They permit the management of different orofacial deformities [2]. The use of temporary anchorage devices (TADs) has been reported for non-conventional purposes, as stabilization for facemask protraction [9], fracture management [10], palatal skeletal expanders [11], and provisional miniscrew-supported pontics [12]. Orthodontic miniscrews of different lengths (usually 5.0 mm to 10.0 mm) and diameters (ranging usually from 1.2 mm to 2.5 mm) are present in the market.
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