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High-speed rotation is a common technique used in a dental handpiece because it enables efficient cutting and shaping of hard dental tissues such as enamel and dentin. High-speed handpieces operate at speeds typically ranging from 100,000 to 400,000 revolutions per minute, allowing for quick and precise procedures, such as cavity preparations and crown preparations. This technique minimizes the time spent on various dental tasks while maintaining accuracy and effectiveness, making it a staple in dental practices.

In contrast, low-speed oscillation, direct impact, and electromagnetic activation are not standard techniques associated with traditional dental handpieces. Low-speed handpieces do exist but typically serve a different function, such as polishing or finishing, where higher speeds are not necessary. Direct impact and electromagnetic activation are not relevant to the typical operations of dental handpieces and do not align with the practices commonly employed in dental procedures. The prominence of high-speed rotation in dental procedures underscores its critical role in enhancing both the effectiveness and efficiency of dental care.