Drilling force and speed for mandibular trabecular bone in oral implant surgery

Abstract

Based on a survey done recently in Japan, 30 percent of the serious accidents occurred in oral implant surgery were concerned with the mandibular canal and 3/4 of them were related to drilling. One of the reasons lies in the lack of the education system. To overcome this problem, a new educational system focusing on drilling the mandibular trabecular bone has been developed mainly for dental college students in the form of an oral implant surgery training simulator that enables student to sense the reaction force during drilling. On the other hand, the conventional system uses polymeric model. Based on these systems, two approaches were proposed; the evaluation by experienced clinicians using the simulator, and experimental works on the polymeric model. Focusing on the combination of the drilling force sensed and drilling speed obtained through both approaches, the results were compared. It was found that the polymeric models were much softer especially near the mandibular canal. In addition, the study gave us an insight of the understanding in bone quality through tactile sensation of the drilling force and speed. Furthermore, the clinicians positively reviewed the simulator as a valid tool.

Understanding the thrust force evolution and primary stability for dental implantation – An in-vitro experimental investigation

“…Moreover, taking thrust force values under N = 600 rpm and f = 20 mm/min as an example, the values of F cor were between 9.92 and 14.75 N, and the values of F tra were between 3.69 and 5.0 N. The experimental results are in general agreement with the results of drilling forces of the cortical and trabecular bones of fresh human cadaver. 31…”

“…Moreover, taking thrust force values under N = 600 rpm and f = 20 mm/min as an example, the values of F cor were between 9.92 and 14.75 N, and the values of F tra were between 3.69 and 5.0 N. The experimental results are in general agreement with the results of drilling forces of the cortical and trabecular bones of fresh human cadaver. 31 Influence of drilling parameters on the thrust force. Existing dental implantation studies have mainly used handpieces for the drilling procedure, which can only be adjusted for drilling speed, not for feed rate.…”

“…Thrust force is the axial force in the feed direction during drilling, which is generated due to the resistance of the material against the intrusion of the drill bit. Thrust force is influenced by some factors, such as material properties, 31 and drilling parameters. 32,33 Excessive thrust force generated during drilling can cause bone cracks and other damages, hence decreasing the stability and strength of the implant fixation.…”