Effect Of Different Root Canal Preparation On Apical Extrusion Of Debris And Irrigants

Objective: A study of extracted teeth, those are used equal amount of irrigation liquid to irrigate root canal after root canal preparation, then to compare the amount of extruded apical debris and irrigants between the three different types of motor-driven Ni-Ti rotary instrument systems (namely the ProTaper, ProFile and K3) and stainless steel instrument( K-file) .Methods: Choose 40 mandible extracted teeth with single root canal. The samples are randomly divided into four groups, with each group containing 10 teeth, which are put through three different types of rotary Ni-Ti instrument systems ( ProTaper, ProFile and K3)and one type stainless steel instrument( K-file) for root canal preparation, in which an equal amount of irrigation liquid to irrigate canals is used for each sample tooth. The extruded apical debris and liquid are collected with the pre-weighed glass tube in the preparation then are measured the weight of the extruded apical debris and the liquid and for statistical analysis.Results: The amount of apical debris generated by the K-file method is ominously larger than the others. K3 method is the least. The variation has statistical significance (p<0.05) ; The amount of extruded rinsing liquid generated by the K-file method is larger than the others. K3 method is the least. The variation between groups has statistical significance (p<0.05); The extruded apical debris and liquid of the K-file has positive correlation.Conclusion:1. The amount of extruded apical debris generated by the Ni-Ti rotary instrument systems is smaller than the stainless steel instrument, while there is no significant variation among these three types of ProTaper, ProFile, and K3.2. There is no statistical positive correlation between extruded apical debris and liquid in the Ni-Ti rotary instrument systems, but the K-file has. That is the more extruded liquid the more extruded apical debris.