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Int Endod J. 2019 Apr;52(4):475-483. doi: 10.1111/iej.13028. Epub 2018 Nov 8.

Effectiveness of complementary irrigation routines in debriding pulp tissue from root canals instrumented with a single reciprocating file.

Author information

1
Department of Endodontics, Universitat Internacional de Catalunya, Barcelona, Spain.
2
Department of Dentistry II, Federal University of Maranhão, São Luis, Brazil.
3
Department of Endodontics, Grande Rio University, Duque de Caxias, Brazil.
4
Department of Dentistry, Universitat de Barcelona, Barcelona, Spain.
5
IDIBELL Institute, Barcelona, Spain.

Abstract

AIM:

To compare histologically the debridement efficacy of four irrigation techniques in root canals instrumented with a reciprocating single file.

METHODOLOGY:

From recently extracted premolars with vital pulp, 68 were selected and classified as having round canals (mesiodistal diameter similar to buccolingual) or oval-shaped canals (mesiodistal diameter 2.5 times larger than buccolingual) (n = 32, each) by means of bidirectional radiographs. Four additional uninstrumented samples served as histological controls. The root canals of the specimens were accessed and then instrumented with Reciproc R25® and further assigned to one of four experimental groups according to the complementary irrigation technique: Group I, conventional syringe; Group II, passive ultrasonic irrigation; Group III, manual dynamic activation (MDA); and Group IV, EndoActivator® . Roots were then demineralized and the apical 3 mm was multi-sliced and processed for histologic examination. The percentage of residual pulp tissue was calculated at each cross section. Kruskal-Wallis and Mann-Whitney tests were used to evaluate the effects of irrigation technique, root canal shape and level of cross section on the percentage of residual pulp tissue (P < 0.05).

RESULTS:

Irrigation technique and root canal shape significantly influenced the percentage of residual pulp tissue (P < 0.05) of canals instrumented with the R25 instrument. Percentage of residual pulp tissue was significantly less using ultrasonic irrigation (P < 0.05), but there was no difference between other irrigation techniques (P > 0.05). Round canals retained significantly less percentage of residual pulp tissue compared to oval-shaped canals (P = 0.001). At 3 mm, there was less pulp tissue compared to levels 2 and 1 mm (P < 0.05).

CONCLUSIONS:

In canals instrumented with R25 files, ultrasonic irrigation was more effective in removing pulp tissue in the apical level, especially for the debridement of oval-shaped canals.

KEYWORDS:

endodontic disinfection; manual dynamic activation; passive ultrasonic irrigation; sonic activation

PMID:
30317653
DOI:
10.1111/iej.13028

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