| Abstract [eng] |
Bone drilling is one of the most often done orthopaedic procedures and because it is done by hand more times than not surgeons are not able to achieve best drilling performance. As a result, temperatures above recommended may be observed at the drill-bone interface, which leads to necrosis of the bone and in turn to longer healing time. To decrease drilling temperature it was proposed to utilize low frequency assisted drilling, as it showed great results when drilling various difficult to machine brittle and hard materials as well as various laminated composites. Two experiments were designed and performed to analyse effect vibration assisted drilling has on the drilling temperature of PMMA, and bone samples. Temperature at the exit hole was measured with thermal camera, it was noted as the drilling temperature. Between drilling operations drill rotational speed, applied force, drill bit parameters, sample properties were taken as constant. Vibration frequency and amplitude were the only varied parameters. Even though the obtained data shows that vibration assisted drilling reduces drilling temperatures, it is important to take into account the limitations of experimental setup. This investigation of vibration assisted drilling of compact bone should be thought of as a stepping stone for future research. |
