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Hand and Engine-driven Techniques for Endodontic Retreatment

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03743233
Recruitment Status : Unknown
Verified November 2018 by Maximiliano Sergio Cenci, Federal University of Pelotas.
Recruitment status was:  Recruiting
First Posted : November 16, 2018
Last Update Posted : November 16, 2018
Information provided by (Responsible Party):
Maximiliano Sergio Cenci, Federal University of Pelotas

Brief Summary:
Numerous instrumentation techniques have been suggested for the nonsurgical retreatment of teeth with primary failure of endodontic therapy in laboratory studies. However, there is limited clinical evidence about those different techniques. The objective of this study is to compare the prevalence and intensity of postoperative pain, as well as the success rate after endodontic retreatment with hand or engine-driven reciprocating instrumentation. A randomized clinical trial will be performed, considering two comparison groups: hand preparation with stainless steel instruments or engine-driven reciprocating preparation with the Reciproc NiTi System (VDW, Munich, Germany), to verify which technique would lead to lower postoperative pain levels and higher endodontic success rates. Secondary outcomes related to technique efficiency will be also registered, evaluating the capacity of filling material removal and the time spent on the clinical procedures. Eighty individuals who need endodontic retreatment in single-rooted teeth will be selected (n=40/group). Endodontic reintervention will be carried out in two visits. Periapical radiographs taken after root filling removal protocols will be transferred to an image analysis software. Then, the percentage of remaining filling material in relation to the total area of the root canal will be evaluated. The clinical time spent with the removal procedure protocol will be registered, in minutes, by a digital stopwatch. After each visit, postoperative pain will be assessed using a numerical rating scale. The record of pain and analgesic drug intake will be performed in 12, 24, 48 hours and 7 days after the clinical procedures. Success rates will be evaluated after 3, 6, 12 and 24 months, through clinical and radiographic examination, considering the Periapical Index, a 5-point score system. Data of both groups (percentage of remaining debris, operating time, postoperative pain, clinical and radiographic success) will be analyzed for normality by the Shapiro-Wilk test. Assuming normal distribution, the data will be compared by t test. Pearson's correlation coefficient will be applied to detect possible correlations between the evaluated outcomes. Differences will be considered significant at P=0.05.

Condition or disease Intervention/treatment Phase
Pain, Postoperative Device: Hand file Device: Reciprocating Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 80 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Hand and Engine-driven Techniques for Endodontic Retreatment: Randomized Clinical Trial
Estimated Study Start Date : December 1, 2018
Estimated Primary Completion Date : November 1, 2019
Estimated Study Completion Date : March 1, 2020

Arm Intervention/treatment
Active Comparator: Hand file instrumentation Device: Reciprocating
Reciproc R25 file will be used for gutta-percha removal, until reaching the WL. The instrument will be introduced into the canal applying slight movements of 3-mm amplitude. Apical patency will be maintained with a size #15 K-file. The root canals will be reinstrumented using the Reciproc R50 file. For both groups, after the root canal filling removal and reinstrumentation protocol, a new radiograph will be taken, without any intracanal instrument, for posterior analysis of the percentage of remaining filling material in the root canal. If the radiograph demonstrates the persistence of filling material, the technique will be repeated with the last instrument used in the chemomechanical preparation (hand or reciprocating file), also using H-files with circumferential movements against the dentinal walls in order to remove these residual material, followed by abundant irrigation with NaOCl.

Active Comparator: Reciprocating instrumentation Device: Hand file
A crown-down technique will be performed until reaching the provisory WL. The root canals will be initially deobstructed with size #3 and #2 Gates-Glidden burs (Dentsply-Maillefer) at the coronal and middle root thirds. Then, hand stainless steel K-files (Dentsply-Maillefer) with decreasing sizes will be used (#40, #35, #30, #25). The WL will be determined by an electronic apex locator (Novapex; Forum Technologies, Rishon Le-Zion, Israel). A radiograph will be taken to confirm the WL, which should be 1 mm short of the root apex. Apical patency will be reached and maintained with a size #15 K-file (Dentsply-Maillefer). The root canals will be reinstrumented and a size #50 K-file will be standardized as the master apical instrument. A step-back procedure in 1-mm increments followed until merging with the crown-down rotary enlargement (size #70) will be achieved.

Primary Outcome Measures :
  1. Post operative pain [ Time Frame: 12, 24, 48 hours and 7 days ]
    Change of post operative pain from baseline to 12h, from 12 to 24h, from 24 to 48h and from 48h to 7 days after treatment, assessed using a visual analog scale, where "zero" means no pain and "10" means maximum pain possible

Secondary Outcome Measures :
  1. Periapical index [ Time Frame: Radiographs will be taken after 3, 6, 12 and 24 months ]
    the radiograph will be assessed considering the apex of the tooth and changes occurred after 3, 6, 12 and 24months after treatment

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Good systemic and oral health;
  • Requiring root canal retreatment in single-rooted teeth (one root and one root canal);
  • Asymptomatic persistent apical periodontitis.

Exclusion Criteria:

  • Use of analgesics, anti-inflammatory drugs or other pain modulating drugs;
  • Chronic systemic disease (eg: diabetes, hypertension, arthritis and renal dysfunction);
  • Systemic disease that could interfere with bone quality;
  • Pregnant or breastfeeding women;
  • Teeth with untreated periodontal disease;
  • Abnormal mobility and with excessively large or curved canals.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03743233

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Federal University of Pelotas Recruiting
Pelotas, RS, Brazil, 96015560
Contact: Fernanda G Pappen, PhD    53 984033599   
Sponsors and Collaborators
Federal University of Pelotas
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Responsible Party: Maximiliano Sergio Cenci, Principal Investigator, Federal University of Pelotas Identifier: NCT03743233    
Other Study ID Numbers: PPGO027
First Posted: November 16, 2018    Key Record Dates
Last Update Posted: November 16, 2018
Last Verified: November 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Pain, Postoperative
Postoperative Complications
Pathologic Processes
Neurologic Manifestations