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Reza Khani , Shahrzad Jalali , Mahdis mohammadpour , Navid Mohammadi , Ghazal Parastooei , Seyed Vasim Hosseini , Fazeleh Sadeghzade Moarefi , Fatemeh Imanijoo

Abstract

Background and objective: MTA sealers have just been developed, and because of their excellent biological characteristics, they may be employed as fillers in endo treatments. Accordingly, this study aims to investigate the efficiency of the rotary DRaCe retreatment approach in gutta excision from the two viewpoints of operating time and the quantity of gutta-percha still present in the canal.

Materials and methods: In this experimental-laboratory work, 64 single-root mandibular premolar removed teeth were produced using the DRaCe technique up to size F3 [30.9%] and were then randomly separated into two groups of 32 teeth depending on the kind of sealer applied. Also, they were filled under the manufacturer's instructions, with the first group's canals being sealed with resin (AH-26) and gutta-percha using a lateral compression technique and the second group's being sealed with gutta-percha and MTA sealer (Endoseal MTA) using a single cone technique for all samples. Using the DRaCe rotating retreatment system, the canals were drained, and the time needed to remove the canal infill material was noted. The samples were then divided longitudinally by a diamond disc, and each half was used to create a computerized periapical radiograph. Using AutoCAD software, the remaining amount of filling material in the radiography image was determined. The Mann-Whitney non-parametric test was utilized to calculate the data. The significance threshold (P<0.05) was taken into account.

Findings: When compared to the group filled with AH-26 sealer, the group filled with MTA-based sealer had considerably more residual sealer (p<0.05). The group filled with MTA sealer took substantially longer to remove the canal-filling material than the control group (p<0.05).

Conclusion: The findings of this investigation show that following retreatment, MTA sealer leaves substantially more residue in the canal walls than resin sealer‎.