Comparison Of ProTaper Crown-down Sequence And Hybrid Technique: Root Canal Preparation In Resin Stimulate Root Canal

Root canal therapy is the most popular choice of permenant teeth with pulpitis and periapical lesion among general dentists and specialist. It consists of three inseparable parts: mechanical root canal preparation, root canal disinfection and three dimensional root canal filling. All the three are considered the same important in light of prognosis of whole surgery as mentioned in modern theory. Root canal preparation is the key step.By combining the advantage of hand-using SS (stainless)-K files and NiTi ProTaper files, a experiment was figured out. After theoretically designing and analysis, integrating point of SS-K file and ProTaper file. The shaping of stimulate root canal, instruments separation rate(ISR) and time are compared between two methods as well as instrument fee.ObjectiveThe experiment was carried out in order to prove a novel way to clean and shape fine curved root canal by using ProTaper and SS-K files. Methods1. Theoretically designing: By measuring the physical dimension of ProTaper and SS-K files and analysis, the integrating point between two kind of instruments was set up.2. 60 sets resin stimulate root canal were divided into two groups. One was applied combined technique to prepare and shape (C group), another was applied crown-down sequence as recommended by manufacturer (P group). Shaping ability,ISR, time and cost in both groups were compared.Results1. Final shape of stimulate root canal in both groups was in continous big-tapered form.2. ISR: C group was zero, while for P group was 10%.3. Preparation time: the average time of C group was 6.37 min. The average time of P group was 11.32 min (t=24.5,u=24.5,p<0.05).4. Cost: P group was 3 times higher than C group.ConclusionThe results implied that combined technique was better choice than crown-down sequence technique in terms of shaping efficiency, preparation time, ISR, even lower cost.