Abstract
Zirconia crowns have recently been used as an alternative to the common gold crowns and as a competitive to lithium disilicate crowns as well. Many research works demonstrated that zirconia crowns do not adhere bacteria. In an experiment carried out on 17 participants from Ramadi rural areas, Anbar province, Iraq. Participants underwent professional cleaning and instructed not to brush for 72hours where swabbed were taken by microbiologist from gold, lithium disilicate and zirconia crown surfaces and cultured in two Petri dishes of blood and sabouraud agars and incubated for 48 hours at 37°C. Kruskal-Wallis test showed that median number of Streptococcus Sanguineous colonies on zirconia crowns was significantly lower than the other two medians. Candida albicans was only found in one case of gold crowns.
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