Table 1 High-speed handpiece and three ways syringe output water contamination at different period of the semester.

From: Periodic detection and disinfection maintenance of dental unit waterlines in dental simulation head model laboratories

Time point

Colony count (CFU/ml)a

T value

P value

Contamination rate (%)

High-speed handpiece

Three ways syringe

High-speed handpiece

Three ways syringe

Beginning

11,586\(\:\pm\:\)1715

5375\(\:\pm\:\)874

3.954

0.001

100.00

100.00

Middle

2041\(\:\pm\:\)327***

1690\(\:\pm\:\)295**

0.866

0.401

100.00

100.00

End

1680\(\:\pm\:\)131***

1372\(\:\pm\:\)119**

1.587

0.135

100.00

100.00

  1. a Mean ± standard deviation. Independent T-tests were conducted, vertically (to compare among different periods) and laterally (to compare between high-speed handpieces and three ways syringes). * Compared with the beginning, *P < 0.05, **P < 0.01, ***P < 0.001.
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