Table 6.

Mean±standard deviation of colony-forming units formed at the dental unit waterlines

Experimental group	Group I	Group II	Group II	P
Colony-forming unit count	361.80±15.20	279.80±27.80	680.0±42.49	<0.05†
Pairwise comparison
Groups			Significance
Group I versus Group II			>0.05‡
Group I versus Group III			<0.05†
Group II versus Group III			<0.05†

^‡P>0.05 considered statistically nonsignificant; ^†P<0.05 considered statistically significant. Group I – Chlorhexidine as ultrasonic coolant; Group II – Cinnamon extract as ultrasonic coolant; Group III – Distilled water as ultrasonic coolant