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KMID : 0602720150190030134
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Implantology
2015 Volume.19 No. 3 p.134 ~ p.145
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A New Drill Design in Sequential Drilling of the Osteotomy Sites
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Lee Sung-Jong
Oh Hyun-Jun
Shin Hyong-Soon
Koo Ki-Tae
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Abstract
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Purpose: The aim of the study was to investigate the effectiveness of multi-step drill for heat production during preparation of implant sites.
Materials and Methods: Four drilling experiments were carried out in this study. Two experiments were conducted in conventional drilling sequence for the implant site of diameter 4.3 mm and 4.6 mm; and another 2 experiments were conducted in experimental drilling sequence for the implant site of diameter 4.3 mm and 4.6 mm. Conventional triflute drill and pilot drill were used in conventional drilling sequence and multi-step drill was used in experimental drilling sequence. Six points of bovine femur were selected to measure the temperature during implant drilling. Temperature changes were assessed with infrared thermal-vision camera in real time. Each drilling sequence was performed 20 times. Thermal image data of experiment was transmitted to and analyzed by personal computer.
Results: Mean value of maximum temperature during experimental drilling sequence was 44.10oC in diameter 4.3 mm and 45.65oC in diameter 4.6 mm. Temperature elevation between conventional and experimental drilling sequence in the critical drilling step were not significantly different (p<0.05). Outer part of the bone showed the highest temperature elevation during drilling.
Conclusion: Within the limitations of this study, multi-step drill shortened the drilling sequence by omitting the pilot drilling step. Based on the study results, the conclusions were (1) there were no significant temperature differences between conventional and experimental drilling sequence. Mean maximum temperature during experimental sequence was below 47oC. Thus, several steps of the drilling could be shortened by using the multi-step drill; and (2) multi-step drill is potentially a powerful and efficient tool that provides several benefits. Shortening the procedures of implant drilling by changing the shapes of fore-end of the drills would be more beneficial to not only clinicians, but also patients.
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KEYWORD
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bone heating, implant, multi-step drill
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