Safety and efficacy of NiTi rotary instruments for gutta-percha removal from curved canals

Authors

Suntaree Petchrungrusmee
Piyanee Panitvisai

Publication Date

2011-05-01

Abstract

Objective To compare the safety and efficacy of gutta-percha removal using NiTi rotary instruments with eucalyptol versus hand files with eucalyptol. Materials and methods Eighty-eight distobuccal root canals of maxillary molars with curvatures ranging between 10° and 35° were instrumented using modified stepback technique and obturated with gutta-percha and zinc oxide eugenol sealer. One week later, gutta-percha was removed using: Group 1-ProFile with eucalyptol and Group 2-H-file with eucalyptol. Safety of gutta-percha removal was evaluated from the extent of canal deviation and loss of dentin. Canal deviation was evaluated by comparing the angles of curvature before and after gutta-percha removal. Loss of dentin was evaluated by comparing the ratios of root to root canal area before and after gutta-percha removal. Efficacy of gutta-percha removal was evaluated by time of gutta-percha removal and cleanliness of the canal wall, which was measured from percentage of remaining gutta-percha. Statistical analysis was performed using Mann-Whitney U test at p < 0.05. Results NiTi rotary instruments caused significantly greater loss of dentin than hand files in a buccolingual direction, but not in a mesiodistal direction. However, the lost dentin was within 1/3 of root width. NiTi rotary instruments removed gutta-percha significantly faster than hand files, with no significant difference in cleanliness of root canals. Conclusion NiTi rotary instruments used with eucalyptol are safe and able to remove gutta-percha in curved canals no different from hand files with eucalyptol. However, the technique requires significantly less amount of removal time.

DOI

10.58837/CHULA.CUDJ.34.2.5

First Page

117

Last Page

128

Recommended Citation

Petchrungrusmee, Suntaree and Panitvisai, Piyanee (2011) "Safety and efficacy of NiTi rotary instruments for gutta-percha removal from curved canals," Chulalongkorn University Dental Journal: Vol. 34: Iss. 2, Article 5.
DOI: 10.58837/CHULA.CUDJ.34.2.5
Available at: https://digital.car.chula.ac.th/cudj/vol34/iss2/5