Abstract
Oral adjustments involving abrasive machining with dental handpieces and abrasive burs are the common practice in clinical dentistry. This practice dates back 7,000–9,000 years. However, the process itself is undoubtedly the least understood and most neglected in modern abrasive technology. In fact, improper operations of oral adjustments are the potential root cause of restoration failure. This paper presents a scientific approach to grindability of dental ceramics in the intro clinical oral regime using diamond burs and air-turbine dental handpieces. Multivariate analysis of variance (MANOVA) was applied to analyse the grindabilities of dental ceramics under the influence of the clinical conditions. The results show that grindability of dental ceramics in the clinical oral regime revealed different scales compared to ceramic machining in the engineering regime. The discussion includes grinding-induced problems in the oral regime, such as vibration, hearing loss, surface and subsurface damage, and thermal damage to soft tissues.
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