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. 2019 Oct;13(4):613-618.
doi: 10.1055/s-0039-3399407. Epub 2019 Dec 31.

Apical Transportation and Centering Ability After Root Canal Filling Removal Using Reciprocating and Continuous Rotary Systems: A CBCT Study

Etienny da Silva Arruda  1 , Emílio Carlos Sponchiado-Júnior  1 , Mariana Travi Pandolfo  2 , Márcio Acris de Carvalho Fredson  3 , Lucas da Fonseca Roberi Garcia  2 , André Augusto Franco Marques  3
Affiliations

Apical Transportation and Centering Ability After Root Canal Filling Removal Using Reciprocating and Continuous Rotary Systems: A CBCT Study

Etienny da Silva Arruda et al. Eur J Dent. 2019 Oct.

Abstract

Objective: To evaluate the apical transportation and centering ability promoted by reciprocating and continuous rotary systems after root canal filling removal.

Materials and methods: After obturation, 40 mesial root canals of mandibular molars were distributed into four groups (n = 20) for filling material removal: PTU group-F2 instrument (25.08) of ProTaper Universal system; R25 group-R25 instrument (25.08) of Reciproc system; X2 group-X2 instrument (25.06) of ProTaper Next system and X3 group-X2 instrument (25.06) of ProTaper Next system, followed by X3 instrument (30.07). Cone-beam computed tomographic analysis was performed before and after filling material removal for acquisition of apical images. Apical transportation (AT) and its direction, and centering ability (CA), were assessed using the equations AT = (X1-X2)-(Y1-Y2) and CA = (X1-X2/Y1-Y2 or Y1-Y2/X1-X2), respectively. Data were submitted to the nonparametric Kruskal-Wallis and Dunn multiple comparison tests (p < 0.05) for statistical analysis.

Results: There was no statistically significant difference among groups for AT (p > 0.05), with a tendency toward transportation in the distal direction. Also, there was no statistically significant difference among groups regarding CA (p > 0.05).

Conclusions: The different systems, including ProTaper Next, caused AT within the acceptable clinical limit after filling removal. In addition, none of the tested systems presented adequate CA.

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Conflict of interest statement

Etienny da Silva Arruda contributed to data acquisition, data analysis, and manuscript preparation. Emílio Carlos Sponchiado-Júnior contributed to concept, study design, and manuscript review. Mariana Travi Pandolfo contributed to manuscript preparation and manuscript editing. Fredson Márcio Acris de Carvalho contributed to statistical analysis and manuscript review. Lucas da Fonseca Roberi Garcia contributed to manuscript preparation, manuscript editing, and manuscript review. André Augusto Franco Marques contributed to concept, study design, and manuscript review.None declared.

Figures

Fig. 1
Fig. 1
Mean values of apical transportation and its direction, and centering ability. (A) Graphic representation (mm) of mean apical transportation values. (B) Graphic representation of apical transportation direction. (C) Graphic representation of mean centering ability values. There was no statistically significant difference among groups (Kruskal–Wallis, the Dunn multiple comparisons test, p < 0.05). n = 20. M–mesial; D–distal; MB–mesiobuccal; ML–mesiolingual.
See this image and copyright information in PMC

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