[The effect of left bacteria in the root canal on prognosis of the root canal therapy].
OBJECTIVE
To study the effect of the left bacteria on the root canal therapy.


METHODS
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.


RESULTS
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).


CONCLUSIONS
The effect of left bacteria in root canal filled with Thermafil wasn't observed.
Dept. of Dentistry and Endodontics, the College of Stomatology, Wuhan University, Wuhan 430079, China.
Jin-mei
JM
He
Zhuan
Z
Bian
Ming-wen
MW
Fan
Bing
B
Fan
D000293:Adolescent; D000328:Adult; D000368:Aged; D003786:Dental Pulp Cavity / Q000382:microbiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010485:Periapical Periodontitis / Q000382:microbiology / Q000628:therapy*; D011379:Prognosis; D012390:Root Canal Therapy