Inconclusive results were reported about the cleaning and disinfection accomplished by the two irrigation methods .
There is insufficient evidence to cl aim general superiority of any one of these methods .
The aim of this study was to systematic ally review and critically analyse the published data on the treatment outcome ( primary outcome ) and on the  cleaning and disinfection of root canals  ( secondary outcomes ) achieved by negative pressure irrigation as compared to syringe irrigation .
A bio-molecular film ex-vivo model to evaluate the influence of canal dimensions and irrigation variables on the efficacy of irrigation.
AIMS To devise an ex vivo model to test the efficacy of irrigation ( static/dynamic ) in removing a bio-molecular film from root canal walls . METHODOLOGY Forty human teeth with single straight canals were r and omly allocated to two groups for static ( n = 20 ) or dynamic ( n = 20 ) irrigation . The root canals were prepared to different apical sizes ( 20 , 40 ) and tapers ( 0.04 , 0.08 ) . The teeth were split longitudinally into two , stained collagen was applied to the canal surfaces and the tooth reassembled in a silicone matrix for dynamic or static irrigation . Digital images of the canal surface were taken before and after irrigation with 9 , 18 , 27 and 36 mL solution . The percentage of canal surface covered with stained collagen was quantified ( ipWin4 ) . The data were analysed using paired t-tests and linear regression models . RESULTS All the five explanatory variables : ' volume of irrigant used ' , ' mode of irrigation ' , ' orientation of open port of needle ' , ' corono-apical level of canal ' and ' root canal dimension ' had a significant ( P < 0.001 ) influence on outcome of irrigation . The corono-apical level of canal was the most dominating factor . After irrigation , the apical third had 19.9 % and 33.8 % less area covered with the bio-molecular film than the middle and coronal thirds respectively . CONCLUSIONS The stained collagen bio-molecular film could not be removed completely by either static or dynamic irrigation . Factors influencing removal , in rank order of decreasing priority , were : corono-apical level , apical size and taper of canal preparation , and dynamic/static irrigation
Inconclusive results were reported about the cleaning and disinfection accomplished by the two irrigation methods .
There is insufficient evidence to cl aim general superiority of any one of these methods .
The aim of this study was to systematic ally review and critically analyse the published data on the treatment outcome ( primary outcome ) and on the  cleaning and disinfection of root canals  ( secondary outcomes ) achieved by negative pressure irrigation as compared to syringe irrigation .