Table 1.

Total viable counts of output water of DCUs

Sampling time	Group A (CFU/mL)		Group B (CFU/mL)		Group C (CFU/mL)
	HSHP	AWS	HSHP	AWS	HSHP	AWS
2 days before BRS®	10,708	9655	4620	710	5070	660
1 day before BRS®	6147	696	6680	1455	2576	2410
On the morning of BRS®	9455	5460	9436	8465	8895	6569
Immediately after BRS®	15	18	45	26	26	29
Day 1	15	18	46	35	31	15
Day 3	8	18	15	2	32	34
Day 5	24	30	22	19	9	56
Day 8	7	13	35	36	44	33
Day 10	13	21	26	75	9	27
Day 12	49	40	54	28	48	40
Day 15	80	60	26	17	17	29
Day 17	50	95	20	24	42	25
Day 19	56	88	15	9	13	9
Day 22	25	18	19	46	56	37
Day 24	12	13	31	21	15	21
Day 26	70	41	21	43	14	18
Day 29	225	110	36	47	35	31
Day 31	543	523	29	40	17	28
Day 33	416	401	33	43	39	45
Day 36	513	442	29	37	24	31
Day 38	362	284	41	38	32	38
Day 40	325	326	38	24	28	31

Notes: CFU/mL colony-forming units per milliliter, HSHP high-speed handpieces, AWS air-water syringe, Group A: underwent shock treatment every 3 weeks, Group B: underwent shock treatment every 2 weeks; Group C: underwent shock treatment every week.