olumetrically analyzed the efficacy` of root canal fillings in primary teeth using spiral computed tomography, however there is no published data comparing volumetric analysis of the filled canals of primary molars with different filling techniques using more advanced imaging method, i.e. CBCT.

The present study have measured the canal space or volume occupied by the voids and the volume occupied by filling material three dimensionally, thereby, assessing the exact amount of intracanal space that can be filled by particular technique. More the volume occupied by voids more will be the chances of failure after pulpectomy and therefore, less effective and efficient is that technique. The results of the present study had shown that all the four techniques can be used for filling the canals of primary molars but the volume of filling material in the filled canals (postobturated volume) was statistically significantly lesser than the volume of the prepared canals (preobturated volume). It indicated that all the four techniques used to fill the canals of primary molars led to voids in the filling material-a finding consistent with many other reports in the literature for the obturation techniques. Though difference was the highest with insulin syringe, followed by lentulospirals, then endodontic pressure syringe and least with skini syringe with navi tip. Hence, Insulin syringe showed worst results in filling the canals of primary molars while skini syringe with NaviTip showed best results for the same.

In the present study lentulospiral was found better than insulin syringe but poor than the other two techniques. This finding was consistent with the findings of Subbha Reddy et al. where endodontic pressure syringe was better than the lentulospirals in controlling the voids. However, Dandashi et.al found no significant difference between the lentulo instrument, pressure syringe and packing technique. Memapour M.et al and Torroes et.al have observed that lentulospirals led to better depth of fill to the apex though more voids were observed by them as compared with two syringe techniques- endodontic pressure syringe and navi tip.