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Table of Contents   
ORIGINAL RESEARCH ARTICLE  
Year : 2017  |  Volume : 20  |  Issue : 1  |  Page : 30-36
Apical extrusion of debris in four different endodontic instrumentation systems: Ameta-analysis


Faculty of Dentistry, SEGi University, No. 9, Jalan Teknologi, Kota Damansara, PJU5, Selangor, Malaysia

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Date of Submission17-Mar-2016
Date of Decision22-Jul-2016
Date of Acceptance21-Aug-2016
Date of Web Publication28-Jun-2017
 

   Abstract 

Background All endodontic instrumentation systems tested so far, promote apical extrusion of debris, which is one of the main causes of postoperative pain, flare ups, and delayed healing.
Objectives Of this meta-analysis was to collect and analyze invitro studies quantifying apically extruded debris while using Hand ProTaper(manual), ProTaper Universal(rotary), Wave One(reciprocating), and self-adjusting file(SAF; vibratory) endodontic instrumentation systems and to determine methods which produced lesser extrusion of debris apically.
Methodology An extensive electronic database search was done in PubMed, Scopus, Cochrane, LILACS, and Google Scholar from inception until February 2016 using the key terms “Apical Debris Extrusion, extruded material, and manual/rotary/reciprocating/SAF systems.” A systematic search strategy was followed to extract 12 potential articles from a total of 1352 articles. The overall effect size was calculated from the raw mean difference of weight of apically extruded debris.
Results Statistically significant difference was seen in the following comparisons: SAFConclusions Apical extrusion of debris was invariably present in all the instrumentation systems analyzed. SAF system seemed to be periapical tissue friendly as it caused reduced apical extrusion compared to Rotary ProTaper and Wave One.

Keywords: Apical extrusion; debris extruded; endodontic instrumentation; Hand ProTaper; meta-analysis; Rotary ProTaper; self-adjusting file; Wave One

How to cite this article:
Western J S, Dicksit DD. Apical extrusion of debris in four different endodontic instrumentation systems: Ameta-analysis. J Conserv Dent 2017;20:30-6

How to cite this URL:
Western J S, Dicksit DD. Apical extrusion of debris in four different endodontic instrumentation systems: Ameta-analysis. J Conserv Dent [serial online] 2017 [cited 2019 Jul 21];20:30-6. Available from: http://www.jcd.org.in/text.asp?2017/20/1/30/209066

   Introduction Top


Apical extrusion of debris also referred to as a “worm of necrotic debris,” is a detrimental event that occurs during the instrumentation of the root canal system.[1],[2] In asymptomatic chronic periradicular lesions, a delicate balance exists between infected canal microbiota and the host defenses. Apical extrusion of bacteria disrupts this balance and causes an acute inflammatory response.[3]

The objectives of this meta-analysis are to systematically analyze all invitro studies quantifying the apically extruded debris while using Hand ProTaper, Rotary ProTaper, Wave One, and self-adjusting file(SAF) systems, and to determine methods which produce lesser debris extrusion.


   Methodology Top


Strategy of literature search

Preferred reporting items for systematic reviews and meta-analyses guidelines were followed while conducting this meta-analysis.[4] An extensive electronic database search was done from inception until February 2016 using the key terms “Apical Debris Extrusion, extruded material and manual/rotary/reciprocating/SAF systems.” The search resulted in 1352 articles in total; 171 articles in PubMed; 1085 articles in Scopus; 10 articles in Cochrane, and 86 in LILACS and Google Scholar. The search was performed by two independent reviewers to identify potentially relevant articles, and the reference lists were also hand-searched. After the removal of duplicates and irrelevant articles by initial screening of titles, a total number of ninety articles were selected, and their abstracts were retrieved.In vitro studies that failed to compare at least two of the four interventions(Hand ProTaper, Rotary ProTaper, Wave One, and SAF systems) were all excluded and the process resulted in 25 articles. The full-text of these articles were retrieved and screened based on the following predetermined exclusion criteria.

Study selection criteria and data extraction

Exclusion criteria: (1) invivo studies, letters, comments, editorials, case reports, proceedings, personal communications, and any type of literature reviews, (2) other language articles, (3) microbial studies that measured the amount of apically extruded bacteria, (4) studies that measured apical extrusion of debris while performing endodontic retreatment, (5) studies in which nonstandard apical preparations were done, and (6) studies in which the outcome measures that is the mean and standard deviation were not mentioned clearly.

List of studies and their reasons for exclusion as numbered in the study exclusion criteria are given in [Table1]. Finally, a total of 12 articles were selected for this meta-analysis, which included 16 direct comparisons in five different combinations: three studies for Hand ProTaper versus Rotary ProTaper, six studies for Rotary ProTaper versus Wave One, three studies for Wave One versus SAF, two studies for Hand ProTaper versus Wave One, and two studies for Rotary ProTaper versus SAF. Out of the possible six combinations of comparisons, one comparison(Hand ProTaper vs. SAF) was not possible because at least two studies are required to conduct a meta-analysis. Aflow chart showing the whole process of the study selection is given as [Figure1]. The following information/data were extracted from the studies that met the inclusion criteria: The name of the first author, year of publication, number of samples in each group, intervention used, and the study outcome measured as mean and standard deviation and is presented in [Figure2]. The four instrumentation systems compared were(Hand ProTaper, Rotary ProTaper, Wave One)(Dentsply-Maillefer, Ballaigues, Switzerland) and SAF systems(ReDent-Nova Raanana, Israel). Astandard pair-wise meta-analysis was planned to synthesize the results of different trials evaluating the same interventions(direct comparisons) to obtain an overall estimate of the treatment effect of one intervention relative to the other.{Table1}{Figure1}{Figure2}

Outcome measures and statistical analysis

The study outcome measure was the mean and standard deviation of apical extrusion of debris measured in milligrams. The overall effect size was calculated from the raw or unstandardized mean difference. The analyses were carried out using fixed and random effect models. The τ2, Chi-square, and I2 statistics were used to measure heterogeneity among the studies. The quality of reporting in the included invitro studies was assessed using modified Consolidated Standards of Reporting Trials guidelines, by taking into consideration, a prespecified question–was the item correctly reported?: Yes(reported) or no(not reported) and is presented in [Table2].[18]The mean, standard deviation, and sample size for each group in each study are extracted, and the computation of the effect size and its variance is carried out. All statistical analyses were performed using the statistical software RevMan 5.3 provided by The Cochrane Collaboration(The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark, 2014). The value is set as 0.01 with 99% confidence interval.{Table2}


   Results Top


Raw mean difference values, forest plots, heterogeneity measures, the overall effect size estimates and P values for all the five comparisons are also given in [Figure2].

Hand ProTaper versus Rotary ProTaper

There was substantial heterogeneity(I2=68%) when data from three studies [19],[20],[21] were pooled; therefore, a random effects model of analysis was used. This meta-analysis revealed that there was greater apical extrusion of debris in the Hand ProTaper group compared to Rotary ProTaper group; however, the difference was not statistically significant(P=0.9), that is P>0.01.

Rotary ProTaper versus Wave One

There was considerable heterogeneity(I2=93%) when data from six studies [20],[22],[23],[24],[25],[26] were pooled; therefore, a random effects model of analysis was used. This meta-analysis revealed greater apical extrusion of debris in the Rotary ProTaper group compared to Wave One group; however, the difference was not statistically significant(P=0.24) that is P>0.01.

Wave One versus self-adjusting file

There was considerable heterogeneity(I2=98%) when data from three studies [24],[27],[28] were pooled; therefore, a random effects model of analysis was used. This meta-analysis revealed that Wave One group showed significantly greater apical extrusion of debris compared to SAF group(P<0.0001) that is P<0.01.

Hand ProTaper versus Wave One

Only two studies [20],[29] included in this meta-analysis compared Hand ProTaper and Wave one groups. There was substantial heterogeneity(I2=62%) when data from the two studies were pooled; therefore, a random effects model of analysis was used. This meta-analysis revealed greater apical extrusion of debris in Wave One group compared to Hand ProTaper group; however, the difference was not statistically significant(P=0.03), that is P>0.01.

Rotary ProTaper versus self-adjusting file

Only two studies [24],[30] included in the meta-analysis compared Rotary ProTaper versus SAF groups. There was no notable heterogeneity(I2=3%) when data from the studies were pooled; therefore, a fixed-effects model of analysis was used. This meta-analysis revealed that Rotary ProTaper group showed significantly greater apical extrusion of debris when compared to SAF group(P=0.0001), that is P<0.01.


   Discussion Top


All endodontic instrumentation systems tested so far cause apical extrusion of debris to some extent, with some systems extruding less and the others more.[3] Such differences in the amount of extruded debris may be crucial for the development of postoperative pain as systems that extrude more debris increase the risk of flare-ups.[31] Several invitro studies have been conducted so far to quantify the apical extrusion of debris while using different endodontic instrumentation systems.

A systematic review and meta-analysis conducted by Caviedes-Bucheli [8] concluded that inflammatory reaction due to apical extrusion of debris is not influenced by the number of files but the type of movement and the instrument design. Therefore, this meta-analysis aims at comparing four different endodontic instrumentation systems showing varied type of movements(manual, rotary, reciprocation, and transline in-and-out vibratory motion).

The objectives of this meta-analysis are to identify, assess, and analyze all invitro studies quantifying the amount of apically extruded debris while using Hand ProTaper(manual), ProTaper Universal(rotary), Wave One(reciprocating), and SAF(vibratory) endodontic instrumentation systems; to determine methods which produce lesser extrusion of debris; and to identify gaps in available knowledge where new trials are required.

The main findings from the results of this meta-analysis are(1) none of the endodontic instrumentation systems, be it manual or rotary or reciprocating or vibratory systems, can limit the apical extrusion of debris completely.(2) SAF system shows significantly lesser apical extrusion of debris compared to Rotary ProTaper and Wave One.(3) Results derived from other combinations are all not statistically significant.

In the present study, the overall effect size is calculated from raw or unstandardized mean difference, because the outcome is measured in a meaningful scale(weight in milligrams) and all the studies included in the analysis use the same scale.[32] Greater weights are given to the results from the studies that provide more information and are more precise(narrower confidence interval) because they are likely to be closer to the “true effect.”[33] The interpretation of I2 values, which is calculated to measure heterogeneity, is based on a rough guide: 0%–40%-might not be important, 30%–60%-may represent moderate heterogeneity, 50%–90%-may represent substantial heterogeneity, 75%–100%-considerable heterogeneity.[34] If I2 statistics indicated heterogeneity; then, a random effects model of analysis is used(DerSimonian–Laird method); if not, a fixed-effects model(Mantel–Haenszel method) is used.[35]

Hand ProTaper versus Rotary ProTaper(manual vs. rotary)

This meta-analysis revealed that there was a greater but statistically nonsignificant increase in apical extrusion of debris in the Hand ProTaper group compared to Rotary ProTaper group, which is consistent with the previous studies.[19],[20] The reason for this may be attributed to the fact that Hand ProTaper prepares the apical area for an extended period, and the operational movement of the file is an operator controlled variable factor; whereas, Rotary ProTaper contacts the apical area for a limited period and also the rotational speed and torque are fixed.[19],[20] Another study [21] revealed results contrary to this meta-analysis; the reason speculated was that the use of Hand ProTaper in a modified balanced force technique, permitted a controlled pressure of the instrument inside the root canal, allowed better removal of adhering debris, thus reducing the apical extrusion of debris.[21]

Rotary ProTaper versus Wave One

This meta-analysis revealed that there was a greater but statistically nonsignificant increase in apical extrusion of debris in the Rotary ProTaper group compared to Wave One group, which is consistent with the previous studies.[23],[24],[26] The reason for this may be attributed to the fact that, in a Wave One instrument, reciprocation tries to mimic the balanced force technique kinematics, which is well known as being a pressure less movement pushing less material periapically.[2] The interplay among several factors such as instrument design, improved alloy, fewer instruments, high cutting ability, and reciprocation kinematics of Wave One system can be used to support their improved control of apically extruded debris [16] found in the present study. Three other studies [20],[22],[25] included in this meta-analysis showed results contrary to this meta-analysis. The reason speculated was that continuous rotation of a Rotary ProTaper instrument may improve coronal transportation of debris by acting such as a screw conveyor.[22],[25] Moreover, the reciprocation movement in Wave One system is formed by a wider cutting angle and smaller release angle. While rotating in the releasing angle, the flutes tend to push the debris apically.[29]

Wave One versus self-adjusting file

This meta-analysis revealed that Wave One group showed significantly greater apical extrusion of debris compared to SAF group, which is consistent with the previous studies [24],[27],[28] The reason for this may be attributed to the closer adaptation of the metal mesh in the SAF system to the canal walls, back-and-forth grinding motion providing scrubbing action on the canal walls, continuous irrigation and additional activation of the irrigant through vibratory motion, continuous replenishment of fresh irrigant from the rotating hub and lack of positive pressure because the solution easily escapes through openings in the file lattice.[15]

Hand ProTaper versus Wave One

This meta-analysis revealed that there was a greater but statistically nonsignificant increase in apical extrusion of debris in the Wave One group compared to Hand ProTaper group, which is consistent with the studies.[20],[29] The reason for this may be attributed to the difference in design of the instruments; the presence of radial lands in a Wave One instrument, which reduces the coronal debris removal capacity enhancing apical extrusion of debris;[36] whereas a ProTaper instrument lacks radial lands causing decreased apical extrusion of debris.

Rotary ProTaper versus self-adjusting file

This meta-analysis revealed that Rotary ProTaper group showed significantly greater apical extrusion of debris when compared to SAF group, which is consistent with the studies [15],[24],[30] The present results may be explained by differences in the instrument design and movement kinematics of SAF and is explained in the comparison of Wave One versus SAF.

Limitations

Limitations of this meta-analysis are:(1) This meta-analysis is conducted by pooling the findings from several invitro studies; making it less reliable compared to invivo studies.(2) All the studies included in this meta-analysis use Myers and Montgomery method [37] to quantify apical extrusion of debris, the reliability of which is questioned, due to the absence of barrier mimicking the periapical tissues present in the actual clinical situation.(3) Funnel plots for assessing publication bias could not be made for this meta-analysis as it requires a minimum of ten studies to make a meaningful funnel plot.[34](4) The summary of results when both significant and nonsignificant data are included is Hand ProTaper≥Rotary ProTaper≥Wave One>SAF. However, a statistically nonsignificant finding from the third combination of comparison is that Hand ProTaper≤Wave One, which is contradictory to the summary stated above. The reason for these self-contradictory results may be attributed to heterogeneity of studies clubbed in this meta-analysis.


   Conclusions Top


Although the articles included in this meta-analysis showed high heterogeneity and high risk of bias, the invitro literature seems to suggest that:(1) Apical extrusion of debris was invariably present in all the instrumentation systems analyzed.(2) SAF system seemed to be periapical tissue friendly, as it caused reduced apical extrusion of debris compared to Rotary ProTaper and Wave One.

Implications for future research:(1) Need for invivo randomized controlled trials evaluating postoperative pain or incidence of flare-ups while using different instrumentation systems.(2) Need for a reliable method to test apical extrusion of debris in the laboratory with a suitable method mimicking the positive pressure to apical extrusion provided by the periapical tissues.(3) Need for more invitro randomized controlled trials comparing Hand ProTaper versus SAF systems, facilitating direct comparisons in future meta-analytic research.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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Correspondence Address:
J Sylvia Western
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Malaysia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0707.209066

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