A Comparison Of Cutting Capacity Among Different Nickel-titanium Instrumentations And Irrigations

Objective: The purpose of this study was to compare the cutting efficiency and the amounts of apically extruded debris and irrigants using Twisted File(TF),Twisted File Adaptive(TFA),Pro Taper,Pro Taper Next in different irrigations.Materials and methods: 80 mandibular premolars were randomly divided into 8groups(n=10 teeth per group).The canals were instrumented using Twisted File(Sybron Endo,Glendora,CA),Twisted File Adaptive(Sybron Endo,Glendora,CA),Pro Taper(Dentsply Maillefer,Ballaigues,Switzerland),and Pro Taper Next(Dentsply Maillefer,Ballaigues,Switzerland)nickel-titanium instruments.The canals were irrigated with ultrasonic irrigation or syringe irrigation.The apically extruded debris and irrigants were collected in pre-weighted Eppendorf tubes.The amount of dental tissue cut and extruded debris and irrigants were assessed with an electronic balance.Results: 1.The Twisted File and Pro Taper had better cutting efficiency than Pro Taper Next(P<0.05).2.Using ultrasonic irrigation had better cutting capacity than syringe irrigation(P<0.05).3.The four instruments using in present study caused apical extrusion.Pro Taper caused the most apical extrusion and Pro Taper Next caused the least(P>0.05).4.Using syringe irrigation caused more extruded irrigants than ultrasonic irrigation(P<0.05).Conclusions:1.The Twisted File and Pro Taper had better cutting efficiency than Pro Taper Next.2.Using ultrasonic irrigation had better cutting capacity than syringe irrigation.3.The four instruments using in present study all caused apical extruded debris and irrigant.4.Using syringe irrigation caused more extruded irrigants than ultrasonic irrigation.