Comparison of Insertion Torque and Pull-Out Strength between Custom-Made Miniscrews and Commercial Miniscrews


  • Jariyapongpaiboon P, Chartpitak J


Orthodontic miniscrews, Primary stability, Maximum insertion torque, Pull-out strength


Custom-made orthodontic miniscrews are clearly different in characteristic components compared with imported commercial miniscrews. Their primary stability have not been well studied. The objective of this study was to compare the primary stability of the custom-made miniscrews with those of the commercial miniscrews. The primary stability was focused on maximum insertion torque and pull-out strength. Two types of miniscrew were used in this study; 20 miniscrews of each. Each miniscrew was inserted perpendicularly into a pig rib embedded in a self-cured acrylic block. Maximum insertion torque was measured using a torque wrench. To measure pull-out strength using a universal testing machine, the pulling force was directed perpendicularly to the bone surface and parallel to the miniscrew axis. The data was statistically compared using univariable linear regression analysis (P<0.05). The results showed that mean maximum insertion torque of the custom-made miniscrews (23.3±4.0 was significantly greater than that of the commercial miniscrews (17.4±3.6 (P<0.001), while mean pull-out strength of the custom-made miniscrews (277.9±51.2 N) was insignificantly less than that of the commercial miniscrews (284.9±70.3 N). In conclusion, the custom-made miniscrews are superior to the imported commercial miniscrews due to greater primary stability. The custom-made miniscrews are a good and affordable alternative for orthodontic use in Thailand.


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How to Cite

ประจักษ์ จริยพงศ์ไพบูลย์ ทบ., วท.ม., จิรวรรณ ชาติพิทักษ์ ทบ., วท.ม. Comparison of Insertion Torque and Pull-Out Strength between Custom-Made Miniscrews and Commercial Miniscrews. j dept med ser [Internet]. 2019 Aug. 1 [cited 2022 Aug. 19];44(4):84-9. Available from:



Original Article