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<span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>The blunt end with side hole irrigation needles have some advantages. They can be placed close to irrigation area, produce turbulent </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>motion of irrigation material, and not push debris to apical. There is no data about the effectiveness of blunt end with side hole irrigation </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>needle to eliminate root canal bacteria in vivo, therefore the research about effectivity of this needle compare to conventional irrigation </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>needle was permormed. In this study 12 samples were used and divided into two groups. The conventional irrigation needle in the </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>first group was used as control and the blunt end with side hole needle was used in the second group. The bacteriological sampling </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>and colony counting was conducted. The paired t-test analysis before and after irrigation showed significant difference on the first </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>and second group. The result indicated that blunt end with side hole needle more effective in eliminating root canal bacteria than </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>conventional needle. Supporting to this study a software of fluent had been done in vitro. The result showed blunt end with side hole </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>needle produced turbulent motion of irrigating liquid and the conventional needle produced laminar motion.</em></span></span></span></span></span></span></span></span><br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" /></span>