Effect of Implant Drill Characteristics on Heat Generation in Osteotomy Sites
임플란트 드릴링 시 열 발생에 대한 드릴 특성의 효과

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치과대학 치의학과
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서울대학교 대학원
implant drill designsurface contact areafrictional heat
학위논문 (석사)-- 서울대학교 치의학대학원 : 치의학과, 2013. 2. 구기태.
Objectives: The objective of this study was to evaluate the effect of drill-bone contact area on bone temperature during osteotomy preparation.

Material and Methods: Conventional triflute Ø3.6 mm drills were modified with the intent to reduce frictional heat induction. The peripheral dimensions of the drill were reduced 0.15, 0.35 and 0.50 mm to evaluate the effect of surface area on induction of frictional heat between the drill and bone/cutting debris (Parameter A). Also, the lateral cutting surface of the drill was set to 0.1, 2.0 and 7.5 mm to estimate heat induced by direct function of the drill (Parameter B). A non-modified triflute drill (parameter A: 0 mm
parameter B: 15 mm) served as control. Thus 9 drills with different A/B combinations versus 1 control were tested in artificial bone. Real time temperature changes (during drilling and withdrawing) were assessed using an infrared thermal imager. Each drilling procedure was performed up to 20 times. Thermal image data was transferred to a PC for simultaneous analysis.

Results: Mean temperature changes for all modified drill combinations were smaller than for the control (P<0.001). The effects of parameters A and B were statistically significant (P<0.001). There was a significant interaction effect between the two parameters (P<0.001) showing that the effect of parameter A on the mean temperature changes is different depending on the values of parameter B. As the dimensions of parameter B decreased, the temperature change during drilling also decreased. However, a tendency for the temperature to increase or decrease by parameter A was not observed.

Conclusions: Within the limitations of this pilot study, the observations herein suggest that reduction in contact area between the drill and bone reduces heat induction. Further studies to optimize drill/bone contact dimensions are needed.
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Theses (Master's Degree_치의학과)
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