A COMPARISON OF Ni-Ti ROTARY AND HAND FILES INSTRUMENTATION IN PRIMARY MOLARS

The aim of the study was to compare the manual and rotary endodontic instruments focusing on risk of perforation when the whole root canal length is instrumented as well as the time required for preparation in primary teeth Fifty four teeth were divided randomly into three groups.Group I: The root canals were prepared manually with K-files. Group II : ProTaper instruments were used in a crown-down manner, Group III: The root canals was prepared with the Hero 642 system. The perforations were made by Hero 642 was %22 and there was no significant differences between groups (P>0.05). Also there was no significant differences between primary maxillary and mandibular teeth (P>0.05) according to perforations.For maxillary and mandibular teeth, the longest time shaping time was recorded when manual technique was used (p<0.05). Also, no statistically difference was found between ProTaper and Hero 642 according to time. Finally, there was statistically significant difference between rotary and manuel techniques for time of instrumentation (p<0.05). Care must be taken with each rotary file, for overpreparation can lead to unexpected lateral perforation, especially in severely curved canals. Rotary preparation for primary teeth was faster than hand preparation and this is very important for shorten the chairtime in pediatric dentistry. Experimental article (J Int Dent Med Res 2013; 6: (1), pp. 6-8)