The clinical application of Dentsply rotary nikel-titanium file on root canal therapy of the curved molar root canal

Objective To observe the clinical application effect of Dentsply rotary nikel-titanium file on root canal therapy of the curved molar root canal.Methods 435 premolar with 1 566 root canals were randomly divided into three groups,including group PT NiTi alloy root canal file,hand group PT NiTi alloy root canal file,two were used Crown-down preparation technique,K group of stainless steel K file(ISO standard)root canal preparation,with the step-back technique preparation technology.Three groups were used the lateral condensation technique in root canal filling.Each root canal preparation operation time,and root canal filling and filling rate were compared.Results The machine group PT each root canal preparation operation time was significantly shorter than the other two groups(P 0.05),PT group machine and hand group PT in root canal therapy root canal filling effect had no significant difference(P0.05).Hand with group PT root canal preparation operation time was significantly less than the stainless steel K group(P0.05),hand with group PT root canal filling rate was higher than that of stainless steel K group(P 0.05).Conclusion The machine used ProTaper in curved molar root canal preparation has obvious superiority,makes more efficient,and saves time and labor,can obtain the good effect of root canal in rows,in clinically gets more and more widely favored recognition,improves oral root canal treatment level,which is worth the clinical popularization,and clinical operation must preventing to break device.