Table 1.

Distribution of aerosol fractions concentration (µg/m³) with and without natural ventilation (dental unit window open). A statistically significant difference was shown between the amounts of PM produced in the two conditions. All experiments were conducted with the unit door closed.

Parameter	Real Time Monitor		p-Value a
	Dental Unit Window Open Mean ± SE (µg/m3)	Dental Unit Window Closed Mean ± SE (µg/m3)
PM1	34.49 ± 0.72	20.73 ± 0.08	<0.001 *
PM2.5	35.34 ± 0.76	21.26 ± 0.08	<0.001 *
BREATHABLE DUST	37.1 ± 0.86	22.14 ± 0.09	<0.001 *
PM10	44.66 ± 1.45	25.01 ± 0.1	<0.001 *
TOTAL DUST	53.95 ± 2.29	27.85 ± 0.14	<0.001 *

^a Student’s t-test, * p < 0.001.