دراسة جرثومية مقارنة بين التحضير الآلي Pro – Taper واليدوي مع بعض الوسائط الكيميائية في معالجة الاقنية العفنة

Background & Objective: It is well established that the microbiological status of the infected root canal at the time of filling plays a crucial role in the successful of treating this canal. The aim of this study was to make microbial comparison between the rotary (Pro – Taper) and manual (Crown – Down) instrumentation with various medications (Naocl- Calcium Hydroxide) in treating the infected root canals. Material & Methods: Seventy infected Single root canals (lower premolars) were treated , and divided into two equal groups (35), the first one for rotary instrumentation, and the second one for manual instrumentation. The canals were sampled before and after instrumentation, after using (Na-o-cl) as an irrigant and after using calcium hydroxide as a dressing for one week. The samples were incubated and statistical methods were performed by Anova & Bonferoni tests at (P<0.05). Results: The results showed that there wasn't significant difference (P=0.201) between rotary and manual instrumentation in reducing the number of bacteria inside the infected canals (5,601 for rotary, 4,602 for manual), and also the bacterial load was reduced with Naocl (7,804 for rotary, 7,103 for manual) and with calcium hydroxide to (9,094 for rotary, 8,8 for manual) . Conclusion: Both rotary and manual instrumentation are not effectiveness alone for infected root canal, and they must be supporting by using various medications (Naocl- Calcium Hydroxide) to critical clinical treating of these canals.