Cleaning and shaping of root canal is considered as one of the most important steps in endodontic therapy and critical in achieving the optimal outcome. The purpose of this study is to compare dimensional changes in curved canals prepared with the use of four different hand files along with Endolift by CBCT.
Method:
60 mesiobuccal canals from extracted first and second mandibular molars with 20-40 degree curve were selected. Following a primary CBCT, they were divided randomly into four groups. Root canal preparations were performed with four types of hand files along with Endolift (NSK, Japan). K-files (Mani, Japan) were used in the first group, NiTi (Maillefer, Swiss) in the second group, K-flex (Kerr, US) in the third group and Triple flex (Sybron, US) in the fourth group. After preparation of all samples, CBCT was carried out in the same manner as before and images were compared using Adobe Photoshop CS3 software and one way ANOVA test.
Result:
Among the four study groups root canal transportation on the mesial surfaces at 0.8, 2.4 and 4.8 mm sections off the apical constriction was significant(p<0.05). The least and the greatest changes were observed in the fourth and first groups, respectively.
On the distal surfaces at 0.8 and 4.8 mm cross sections the changes between the studying groups was significant. Significant changes on the buccal surface were only observed at 0.8 cross sections. However, no significant changes were observed on the lingual surfaces at any section. Also, no significant changes were seen on any any surfaces at 6.8 cross sections.
Conclusion:
In curved canals, especially at apical 5 mm, use of Endolift together with “Triple flex” files keep on more centered in the canal and produce least transportation.