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KMID : 1036420170100020066
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대한치의학회 영문학회지
2017 Volume.10 No. 2 p.66 ~ p.73
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Effect of Laser Pre-Drilling on Insertion Torque of Orthodontic Miniscrews - A Preliminary Study
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Kim Keun-Hwa
Choi Sung-Hwan
Cha Jung-Yul
Hwang Chung-Ju
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Abstract
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Purpose: To evaluate the effect of different-sized drill tips and laser irradiation times on the initial stability of orthodontic miniscrews placed in Er,Cr:YSGG-laser pre-drilled holes in an animal model.
Materials and Methods: Laser pre-drilled holes were made in dog mandibular bone with an Er,Cr:YSGG laser using irradiation times of 5, 7, 9, 11, and 13 seconds, and tip diameters of 0.4 and 0.6 mm. The maximum diameter and depth of the pre-drilled holes was measured with micro computed tomography. The maximum insertion torque was measured during placement the miniscrew.
Result: Laser pre-drilled holes were conical shaped. The maximum diameter of pre-drilled holes increased with longer laser irradiation times (P>0.05) and larger tip diameters (P<0.05). The depth of pre-drilled holes increased with longer laser irradiation times and larger tip diameters (P<0.05). When the 0.4 mm tip, but not the 0.6 mm tip, was used, the insertion torque decreased significantly with longer laser irradiation times (P<0.05).
Conclusion: Tip diameter impacted insertion torque more than irradiation time. It takes at least 9 seconds using a 0.6 mm tip to create a 0.8 mm diameter and 1.0 mm depth hole in thick cortical bone.
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KEYWORD
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Diameter, Er, Cr:YSGG-laser, Insertion torque, Irradiation time, Laser pre-drilling, Miniscrews
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