The effect of left bacteria in the root canal on prognosis of the root canal therapy / 华西口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To study the effect of the left bacteria on the root canal therapy.</p><p><b>METHODS</b>50 single-rooted teeth with chronic apical periodontitis were divided into two groups, one was instrumented with step-back technique and 2.5%NaOCl ultrasonic irrigation for 3 min, then filled with Thermafil. Samples were taken after instrumentation to culture. The other was treated with traditional RCT at three visits.</p><p><b>RESULTS</b>In 24 months the apical radiolucency were greatly reduced in all cases. There weren't significant relationship among the postoperative pain and the left bacteria, the degree of the obturation or the pre-operative symptoms (P > 0.05).</p><p><b>CONCLUSION</b>The effect of left bacteria in root canal filled with Thermafil wasn't observed.</p>