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KMID : 0361920110410050354
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Korean Journal of Orthodontics
2011 Volume.41 No. 5 p.354 ~ p.360
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The effects of different pilot-drilling methods on the mechanical stability of a mini-implant system at placement and removal: a preliminary study
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Cho Il-Sik
Choo Hye-Ran
Kim Seong-Kyun
Shin Yun-Seob
Kim Duck-Su
Kim Seong-Hun
Chung Kyu-Rhim
Huang John C.
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Abstract
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Objective:To investigate the effects of different pilot-drilling methods on the biomechanical stability of self-tapping mini-implant systems at the time of placement in and removal from artificial bone blocks.
Methods:Two types of artificial bone blocks (2-mm and 4-mm, 102-pounds per cubic foot [102-PCF] polyurethane foam layered over 100-mm, 40-PCF polyurethane foam) were custom-fabricated. Eight mini-implants were placed using the conventional motor-driven pilot-drilling method and another 8 mini-implants were placed using a novel manual pilot-drilling method (using a manual drill) within each of the 2-mm and 4-mm layered blocks. The maximum torque values at insertion and removal of the mini-implants were measured, and the total energy was calculated. The data were statistically analyzed using linear regression analysis.
Results:The maximum insertion torque was similar regardless of block thickness or pilot-drilling method. Regardless of the pilot-drilling method, the maximum removal torque for the 4-mm block was statistically higher than that for the 2-mm block. For a given block, the total energy at both insertion and removal of the mini-implant for the manual pilot-drilling method were statistically higher than those for the motor-driven pilot-drilling method. Further, the total energies at removal for the 2-mm block was higher than that for the 4-mm block, but the energies at insertion were not influenced by the type of bone blocks.
Conclusions:During the insertion and removal of mini-implants in artificial bone blocks, the effect of the manual pilot-drilling method on energy usage was similar to that of the conventional, motor-driven pilot-drilling method.
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KEYWORD
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Anchorage, Implant design, Surface treatment, Orthodontic mini-implant
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