Effect of 980nm Diode Laser on Postoperative Pain and Root Canal Disinfection in Endodontic Retreatment Cases

Evaluation of the Effect of 980nm Diode Laser Intracanal Irradiation on Postoperative Pain and Root Canal Disinfection in Endodontic Retreatment Cases With Chronic Periapical Lesions

A randomized clinical trial that evaluates the effect of using 980nm diode laser intracanal irradiation on postoperative pain and root canal disinfection in endodontic retreatment cases with chronic periapical lesions

The endodontic retreatment procedures will be carried out for the participants, then 980nm Diode laser will be used to disinfect root canals. The researcher will then take microbiological samples of the root canals, to determine count and type of microorganisms in root canals. The subject will be asked to determine his level of pain at 7 days after endodontic retreatment procedures in a visual analogue scale (VAS), and to determine number of analgesic tablets needed to relieve his pain in the given charts. The subject will then return to the clinic 7 days later to bring back his charts. The researcher then will take another microbiological sample of the root canals, and complete the endodontic retreatment procedures.

Inclusion Criteria:

1. Endodontic retreatment cases of single rooted teeth with chronic periapical lesions; with periapical radiolucency of less than 1 cm diameter will be selected.
2. Teeth with straight root canals.
3. Subjects aged between 18-50 years of age.
4. No contributory medical history.
5. No previous administration of analgesics and / or antibiotics within the previous 2 weeks.

Exclusion Criteria:

1. Retreatment cases with complications such as separated instruments, perforations, ledges, resorption, transportation, calcifications, immature apices and over fillings.
2. Teeth with curved roots.
3. Swelling or sinus tract.
4. Mutilated teeth that interfere with proper isolation and seal between visits.
5. Subjects with generalized periodontitis, or if the tooth has probing depth of more than 3 mm.
6. Subjects with uncontrolled diabetes or debilitating diseases.
7. Pregnant or nursing females.
8. Systemic disorders that necessitate antibiotic prophylaxis or prevent the use of Ibuprofen.