According to the Spaulding classification system used in Canadian dental infection control, how are dental handpieces classified and what level of processing do they require?
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A
Non-critical items requiring low-level disinfection
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B
Semi-critical items requiring high-level disinfection only
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C
Critical items requiring heat sterilization
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D
Semi-critical items requiring heat sterilization because they contact mucous membranes and are contaminated with blood