Clinical Trial: Clinical and Microbiological Evaluation of 0.5% Versus 3% Sodium Hypochlorite in Root Canal Treatment

Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Interventional

Official Title: Clinical and Microbiological Evaluation of 0.5% Versus 3% Sodium Hypochlorite in Root Canal Treatment

Brief Summary:

Aim: To compare the clinical antimicrobial and adverse effects of irrigation with Sodium Hypochlorite (NaOCl) 0.5% versus NaOCl 3% during root canal treatment.

Methodology: Consecutive patients referred to a specialist clinic of endodontics are randomly assigned to have the root canal treatment performed with a concomitant irrigation either with a buffered 0.5 % NaOCl (Dakin's solution) or 3 % NaOCl. Teeth with vital or necrotic pulps and retreatment cases were included. Root canal treatment procedures varied but followed the routines of the Specialist Clinic of Endodontics, Public Dental Health, Gothenburg, Sweden. Immediately before the root canal filling a microbial sample is taken from the operative field and the root canal. The bacterial samples were processed at the laboratory as outlined by Möller (1966). After each visit each patient was instructed to fill in a questionnaire and assess his or her post-operative pain on a visual analogue scale (VAS), with endpoints 0= "no pain" and 10= "worst imaginable pain", for seven consecutive days. The Fischer's exact test was used for statistical analyses of the differences in outcome between the groups.


Detailed Summary:

The aim of the present study is to compare the antimicrobial and immediate clinical effect of NaOCl 0.5% with the effect of NaOCl 3% in the endodontic treatment of teeth referred to the Specialist Clinic of Endodontics, Göteborg, Public dental Health, Västra Götaland. The efficiency of the treatment will be evaluated with sampling and cultivation methods and the assessment of patients' symptoms with a visual analogue scale.

The sample size calculation was performed with a type I error of 0.05 and statistical power of 80 %. The investigators expected 70 % of the samples to be free from bacteria growth in the control group and the investigators considered clinically relevant a difference of 15 % between the groups in order to demonstrate significant differences attributable to the experimental therapy used. The investigators want our sample size to be two hundred sixty four patients, 132 to each group.

A detailed explanation of the purpose of the study was given. Patients were also informed about the confidentiality of the data to be collected and about the voluntary participation. Every patient gets assigned a code that indicates which group they belong so the same irrigant is used in case of more than one visit.

Root canal treatment followed the standard principles of the Specialist Clinic of Endodontics, Göteborg, Public dental Health, Västra Götaland but the treatments were not restricted to a single protocol.

The recommended minimum or optimal apical size of canal preparation is size 25. All the operators are informed to perform the endodontic treatment the way operators normally do. The only variation during treatment was the concentration of the sodium hypochlorite solution for irrigation o
Sponsor: Göteborg University

Current Primary Outcome: Assessing bacterial growth in the root canal (positive meaning cultivable bacteria present, negative meaning absence of cultivable bacteria) [ Time Frame: Sample from the root canal taken immediately before root canal filling, assessing growth for 30 days after the sample is taken. ]

Bacterial sampling was taken just before the root canal filling. The sodium hypochlorite solution and the iodine-potassium-iodide were inactivated with 5 % sodium thiosulfate solution for 30 sec. The canals were then filled with VMGA I, dentinal shavings were produced with H files ISO #25. The entire canal content was absorbed by means of charcoal points and transferred to VMGA III.


Original Primary Outcome: Same as current

Current Secondary Outcome: Assessment of post-operative pain using a questionnaire containing 7 visual scales. [ Time Frame: 7 consecutive days after each appointment ]

Each patient was instructed to fill in a questionnaire after each visit. This questionnaire contains seven visual scales (VAS) based on a 10 cm line determining the pain level. The patient is asked to estimate the pain they have 7 days after the endodontic procedure where 1 is very mild pain and 10 the worse pain they can imagine. The questionnaires were measured with a plastic ruler and the recordings will be transposed to numbers and registered in the excel file by the main investigator.


Original Secondary Outcome: Same as current

Information By: Göteborg University

Dates:
Date Received: January 26, 2016
Date Started: October 2014
Date Completion: April 2017
Last Updated: February 9, 2016
Last Verified: February 2016