Savarna Goswami , Anu Narang , Santosh kumar singh , Rashi motwani, Sajal Chaudhary ,
Palak choudhary

ABSTRACT

Aim: To study and evaluate the remaining dentin thickness (RDT) and canal transportation in maxillary first premolar with conventional and truss access cavity preparation using CBCT. Materials and Methods: Buccal canals of thirty maxillary first premolars were selected for the study, uncalcified canals with fully formed apex of comparable length were chosen and examined for any irregularities and discrepancies , then canals were randomly divided in to two groups of 15 each and canal preparation was done using NT Rainbow file system , Pre-instrumentation and post-instrumentation CBCT images were obtained at three levels, 3, 6 and 9 mm above the apical foramen and were compared using CBCT software. Amount of remaining dentin thickness and canal transportation were assessed. The two groups were statistically analysed. Results: The data obtained from CBCT was statistically analysed using independent‘t’ test by evaluating remaining dentin thickness and canal transportation at 3mm, 6mm, 9mm. upon comparing there was no significant difference in remaining dentin thickness at 6, 9mm but a significant difference was seen at 3mm, likewise a significant difference in canal transportation was noted at 3mm but there was no significant difference at 6, 9mm. Conclusion: In conclusion to the study, there was no statistically significant difference between the conventional and the truss access cavity groups in relation to remaining dentin thickness and canal transportation as there was no significant difference at coronal third and middle third, however there was a statistical significant difference at apical third level..