Table 1.

Analysis of the Data With All Variables: High-Volume Evacuation (HVE) and Extraoral Evacuation (EVE)

Between factor	Within factor			Hypothesis tests
Evacuation	Preoperative	1 minute	15 minutes	Effect	P value
HVE only (n = 18)	837.4 ± 431.6	2676.3 ± 1476.1	2211.8 ± 793.9	Evacuation	.0022
HVE-EVE (n = 18)	915.2 ± 339.7	1790.0 ± 520.3	1175.2 ± 552.9	Time	<.0001
				Interaction	.0023

Bur type				Effect	P value
330 (n = 13)	1130.3 ± 355.6	2551.1 ± 1541.6	1610.9 ± 842.9	Bur Type	.4539
Diamond (n = 3)	925.3 ± 470.8	1772.3 ± 589.8	1286.3 ± 289.4	Time	<.0001
Round carbide (n = 20)	703.9 ± 306.2	2097.4 ± 950.0	1808.3 ± 918.8	Interaction	.2992

	Surface Material			Effect	P value
Amalgam (n = 8)	994.6 ± 416.9	2841.4 ± 1327.8	2125.0 ± 840.6	Material	.4496
Composite (n = 13)	749.2 ± 346.5	1991.7 ± 765.5	1736.2 ± 975.0	Time	<.0001
PFM (n = 2)	727.0 ± 455.4	1692.0 ± 756.6	1270 ± 407.3	Interaction	.1556
Tooth (n = 13)	928.4 ± 398.4	2256.2 ± 1428.8	1512.5 ± 791.4
Zirconia (n = 1)	1322.0 ± 0	2059 ± 0	1319 ± 0

PFM, Porcelain fused to metal.