During bone burring, the heat generated due to friction at the bone–burr interface may cause thermal damage to the bone. Therefore, it is necessary to assess bone temperature distribution around a burring site and identify high-risk regions for thermal necrosis due to bone burring. In this study, a three-dimensional (3-D) dynamic elastoplastic finite element model for the burring process was developed and experimentally validated to investigate the influence of burring parameters (rotational speeds: 3,000, 10,000, 15,000 and 60,000 rpm; feed rates: 0.5, 0.9, 1.5 and 3.0 mm/s) on heat generation and evaluate the risk region for thermal necrosis. Calculated bone temperatures were compared with experimental values and found to be in good agreement with them. The analytical results demonstrated a linear relationship between the burring time and friction energy. In addition, the friction energy increased with the bone temperature. The high-risk thermal necrosis zone was measured from the edge of burring (y-direction) at feed rates of 0.5, 0.9, 1.5 and 3.0 mm/s and was found to be 7.8, 7.3, 6.6 and 5.5 mm, respectively. When the burr rotational speed increased from 3,000 to 60,000 rpm, the high-risk zone for thermal necrosis increased from 4.5 to 8.1 mm. We concluded that both the friction energy and the bone temperature increased in proportion with the burr rotational speed. Reducing burr rotational speeds and/or increasing feed rates may decrease the rise in bone temperature, thus decreasing the potential for thermal necrosis near the burring site. Our model can be used to select the optimal surgery parameters to minimise the risk of thermal necrosis due to bone burring and to assist in the design of optimal orthopaedic drill handpieces.

在骨骼去毛刺过程中，由于骨毛刺界面处的摩擦而产生的热量可能会对骨骼造成热损伤。因此，有必要评估去毛刺部位周围的骨温分布，并确定由于去骨而引起的热坏死的高风险区域。在本研究中，开发了用于毛刺处理的三维（3-D）动态弹塑性有限元模型，并通过实验验证了毛刺参数的影响（转速：3,000、10,000、15,000和60,000 rpm;进给速度： 0.5、0.9、1.5和3.0 mm / s），并评估热坏死的风险区域。将计算出的骨温与实验值进行比较，发现与实验值非常吻合。分析结果表明，去毛刺时间与摩擦能之间存在线性关系。另外，摩擦能随着骨骼温度的升高而增加。从毛刺边缘（y方向）以0.5、0.9、1.5和3.0 mm / s的进给速度测量高风险热坏死区，发现分别为7.8、7.3、6.6和5.5 mm。当毛刺旋转速度从3,000 rpm增加到60,000 rpm时，热坏死的高风险区从4.5毫米增加到8.1毫米。我们得出的结论是，摩擦能量和骨骼温度均与毛刺旋转速度成比例地增加。降低毛刺旋转速度和/或提高进给速度可能会降低骨骼温度的升高，从而降低毛刺部位附近发生热坏死的可能性。