"Postoperative Pain Following Laser-Assisted Root Canal Treatment: A Randomized Clinical Trial"

The aim of this study is to evaluate in vivo the post operative pain after laser root canal treatment in necrotic teeth in an evidence-based clinical trial. The null hypothesis being tested is that there is no difference in post operative pain between conventional irrigation and the two types of lasers used. Forty-five patients are equally divided into 3 separate groups : * Group A (Conventional): 2.5% NaOCL and 17% EDTA. * Group B(Dual): saline along with Er,Cr:YSGG laser and diode laser combination * Group C(Combined): saline along with 17% EDTA and diode laser combination Each patient is given pain scale chart Numeric Rating Scale (NRS) to record his/her pain level before any endodontic treatment. All data will be collected, tabulated, summarized, and statistically analyzed.

Inclusion Criteria: * Patients who had asymptomatic, single-rooted maxillary anterior teeth with necrotic pulp and periapical lesion with a periapical index score of 3 or 4 * Patients complaining of no pain and without fistulous tract * Closed apex. * Acceptance to participate in the study. Exclusion Criteria: * Antibiotic use within the last month, anti-inflammatory analgesic use within the last 5 d, systemic diseases or allergic reactions, calcified canals, root resorption, previous root canal treatment. * Periodontal diseases, presence of swelling or fistulous tract. * Vulnerable group including pregnant females, mentally or physically disabled individuals. - Technical difficulties during root canal treatment such as; curved roots, broken files, over instrumentation, overfilling or incomplete filling.