Reingewirtz Y, Szmukler-Moncler S, Senger B
Department of Periodontology, Faculty of Dentistry, Université Louis Pasteur, Strasbourg, France.
Clin Oral Implants Res. 1997 Jun;8(3):189-97. doi: 10.1034/j.1600-0501.1997.080305.x.
The influence of various parameters on bone heating during drilling and drilling time was studied in vitro in a bovine cortical femur model. Drilling using a standard, a surgical or a laboratory motor unit did not affect bone temperature elevation. For a given speed, low 1/40 reduction contra-angle was more effective in moderating temperature elevation when compared to 1/10 reduction; but drilling time in this case (1/40) had to be doubled. Enhancing the drilling load from 0.8 kg to 2 kg had little effect on temperature elevation at 400 rpm and 800 rpm (< 3 degrees C). Drilling time drastically decreased and was inversely proportional to the square of the load. Predrilling did not affect temperature elevation, but decreased drilling time. From 400 rpm to 10,000 rpm, temperature elevation was positively correlated with drilling speed. It further decreased up to 24,000 rpm and then was constant up to 40,000 rpm. Drilling time was proportionally reduced with increased rotation speed. Strikingly, heat was largely dissipated within 10 s at high rotation speed. The use of a cryogenic spray at 24,000 rpm allowed the reduction of temperature elevation. Finally, protection from temperature elevation according to above parameters is suggested.
在牛股骨皮质体外模型中研究了钻孔过程中各种参数对骨加热及钻孔时间的影响。使用标准、手术或实验室动力装置进行钻孔对骨温升高没有影响。对于给定速度，与1/10弯机头相比，1/40低弯机头在缓和温度升高方面更有效；但这种情况下（1/40）的钻孔时间必须加倍。在400转/分钟和800转/分钟时，将钻孔负荷从0.8千克增加到2千克对温度升高影响不大（<3℃）。钻孔时间大幅减少，且与负荷的平方成反比。预钻孔不影响温度升高，但会减少钻孔时间。从400转/分钟到10000转/分钟，温度升高与钻孔速度呈正相关。转速进一步提高到24000转/分钟时温度升高进一步降低，然后在40000转/分钟时保持恒定。钻孔时间随转速增加而按比例减少。引人注目的是，在高转速下，热量在10秒内基本消散。在24000转/分钟时使用低温喷雾可降低温度升高。最后，建议根据上述参数防止温度升高。
