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KMID : 0361920090390020095
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Korean Journal of Orthodontics
2009 Volume.39 No. 2 p.95 ~ p.104
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Effect of cutting flute length and shape on insertion and removal torque of orthodontic mini-implants
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Yoon Soon-Dong
Lim Sung-Hoon
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Abstract
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Objective: The purpose of this study was to evaluate the effect of length and shape of cutting flute on mechanical properties of orthodontic mini-implants.
Methods: Three types of mini-implants with different flute patterns (Type A with 2.6 mm long flute, Type B with 3.9 mm long and straight flute, Type C with 3.9 mm long and helical flute) were inserted into the biomechanical test blocks (Sawbones Inc., USA) with 2 mm and 4 mm cortical bone thicknesses to test insertion and removal torque.
Results: In 4 mm cortical bone thickness, Type C mini-implants showed highest maximum insertion torque, then Type A and Type B in order. Type C also showed shortest total insertion time and highest maximum removal torque, but Type A and B didn’t showed statistically significant difference in insertion time and removal torque. In 2 mm cortical bone thickness, there were no significant difference in total insertion time and maximum removal torque in three types of mini-implants, but maximum insertion torque of Type A was higher than two other Types of mini-implants.
Conclusions: Consideration about length and shape of cutting flute of mini-implant is also required when the placement site has thick cortical bone.
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KEYWORD
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Cutting flute, Total insertion time, Maximum insertion torque, Maximum removal torque
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