Abstract
This study was undertaken to determine which operative technics permitted cavity preparation with minimal pulpal reaction. Factors studied were speed, cutting tool, coolant and load. The value of coolants becomes more significant at the higher speeds. In the absence of adequate coolants, intermittent grinding is of no appreciable benefit. Preparation time at the higher speeds is of little consequence provided frictional heat is controlled by coolants. The combination of high speed, controlled temperature and light load is conducive to minimal pathological alterations in the pulp.
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