Evaluation of Apically Extruded Debris and Irrigant Produced by Different Nickel-Titanium Instrument Systems in Primary Teeth.

AIM: The purpose of this study was to determine the amount of extruded debris and irrigant associated with different single-file systems and one multiple-file system. MATERIALS AND METHODS: Forty-five newly extracted single rooted primary canine teeth were used in this study. The root canals were instrumented using the reciprocating single-file system, the single-file rotary system and the multiple-file rotary system. A 10(-6) precision micro-balance was used to calculate the amount of extruded debris and irrigant. The incubation period was set as 15 days at 37 degrees C to obtain dry debris. The preparation time for instrumentation was also recorded. The data were statistically analyzed by Manova and Bonferroni adjustment. RESULTS: Considering the apically extruded debris, while there was statistically significant difference between Reciproc and OneShape groups (p < 0.05), no statistically significant difference was found among the other groups (p > 0.05). In terms of irrigation solution, although significant difference was obtained between the Reciproc and other two groups (p < 0.05), no statistically significant difference was obtained between the two rotary instruments (p > 0.05). Instrumentation was significantly faster using Reciproc than with all other instrument (p < 0.05). CONCLUSION: All systems caused apical debris and irrigant extrusion. Full-sequences rotary instrumentation systems may be preferable for preparation primary teeth. CLINICAL SIGNIFICANCE: This is the first study carrying out to compare both apical debris and irrigation solution extrusion with reciprocal and rotary single-file systems with other preparation systems in primary teeth.