Abstract
An over-all effectiveness concept can be resolved from this study. The term “effectiveness” could theoretically be extended to include a period of from an hour to several days prior to the actual appointment period. Another variable period occurs postoperatively. All dental practitioners are aware of the unique aura which occurs to patients prior to their appointment. This is brought about by fear, anticipation of pain, or memories of unpleasant episodes related to removal of tooth structure. After treatment, such occurrences as prolonged anesthesia with its coincidental side effects, pulpal hyperemia caused by excessive temperatures and pressures, neuromuscular fatigue, and nervous exhaustion are not uncommon (Fig. 7). Most of these factors are no longer present after the initial session of cavity preparation with one of the newer instruments. The effectiveness of these handpieces then can be said to extend beyond the appointment period proper (Fig. 8). A patient who dreads a dental appointment during which tooth structure is to be removed in the conventional low-speed manner might conceivably perform his own duties with reduced efficiency because of this. There is little doubt that for a variable period after a traumatic dental session, the patient cannot work at optimum efficiency. [Display omitted] Fig. 8.-A graphic representation of the extended effectiveness concept. This chart illustrates the over-all benefits obtained by the removal of tooth structure with the newer devices and techniques evaluated in this experiment. It is of interest to note that in the over-all time of operation the difference in high-speed and superspeed was not great (Table VI). The importance of “how fast” a dental procedure can be performed should be minimized. All preparations were accomplished by the same dentist during this experiment. These could have been prepared by another dentist in a longer or shorter time. This investigator did note, as paramount, the fact that with effective instrumentation there was more time available for attention to the minutest details in cavity preparation with no increase, but rather with an actual decrease in time.
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