An Observational Study of Performance Parameters in High-Speed Dental Handpieces After Eight Months of Routine Clinical Use in an Educational Setting

This observational study evaluated changes in selected performance parameters of 15 new high-speed dental handpieces after eight months of routine clinical use in a routine educational undergraduate environment (two 4 h daily clinical shifts, five days per week, with repeated sterilization cycles). All handpieces underwent routine cleaning, lubrication, and autoclave sterilization as instructed. The turbine components from the handpieces were disassembled and examined by stereomicroscopy before and after use, while free-running speed and friction grip force were assessed at the same intervals. Two handpieces were no longer operational at follow-up due to ball bearing failure. Paired t-test was performed for free-running speed and friction grip force. Among the remaining handpieces, statistically significant reductions were observed in both free-running speed and friction grip force (p < 0.01). Microscopic examination of the rotors revealed surface alterations consistent with corrosion and wear. Within the limitations of this study, routine clinical use over an eight-month period was associated with measurable changes in key performance characteristics of high-speed dental handpieces in educational clinical settings.