Table 1.

Search strategy

#	Search terms
#1	dent* OR ‘dental hygienist’ OR ‘dental assistant’ OR ‘oral health therapist’
#2	‘hearing impair*’ OR ‘hearing loss’ OR ‘hearing issues’ OR deafness OR ‘partial hearing’ OR ‘deaf*’ OR tinnitus OR ‘noise induced hearing loss’ OR ‘noise-induced hearing loss’ OR NIHL OR ringing OR ‘occupational hearing loss’ OR ‘transitory hypoacusis’
#3	‘ultrasonic scaler’ OR ‘ultrasonic instrument’ OR ‘ultrasonic equipment’ OR ‘ultrasonic cleaner’
#4	‘dent* handpiece’ OR ‘dent* drill’ OR ‘dent* air turbine handpiece’ OR ‘air turbine handpiece’
#5	‘dent* technician equipment’ OR ‘dent* technician instruments’ OR ‘dent* laboratory equipment’
#6	‘high volume suction’ OR ‘high volume evacuator’ OR ‘dental suction’ OR suction
#7	risk* OR impact OR effect OR influence OR hazard
#8	#1 AND #2 AND #3 AND #4 AND #5 AND #6 AND #7