Historically, Rootcanal treatment reminds of painful  long multiple sitting. With advances in  research and technology single visit endodontics has gained acceptance. Success of root canal treatment depends on proper cleaning , shaping & disinfecting the canals& hermetically sealing the canals. Very few studies have been carried out to compare the effectiveness of Er:YaG laser in  single sitting endodontic treatment for non-vital tooth. In our fast pacing & committed life, Successful Single visit endodontics  is the  treatment of choice. However , painless procedure followed by predictable  treatment outcome is still a challenge.

Aim of the study is to find  the Incidence of post-operative pain following single visit endodontics in  non-vital teeth , using Er:YAG laser

i) To compare treatment outcome of single visit endodontics in non vital teeth against the conventional treatment and study pattern of pain post operative  after 1^st day ,3^rd day & 5^th  day using Visual analogue scale .

In this prospective clinical study, 60 multirooted teeth indicated for endodontic treatment were treated by a single endodontist according to a preestablished protocol. The teeth were randomly divided into four groups (n = 30).

Group 1 – Single sitting endodontics with use of Er: YAG laser & Sodium hypochlorite as last irrigant .

Group 2 – Single sitting endodontics with use of conventional syringe for irrigation with sodium hypochlorite as last irrigant .

The patients will be allotted in all work groups using block randomization. All the cases will be studied for pattern of pain after 12, 48 and 72 hrs of endodontic treatment, patients’ pain post operatively will be evaluated telephonically through a Visual Analog Scale (VAS) ranging from 0 to 10. Scale 0-6 will be evaluated as mild to moderate pain manageable with & without analgesics. Scale 0-7 will be evaluated as severe pain not manageable by medication, requiring clinical re-evaluation. In all workgroups, similar protocols were used for instrumentation with the Protaper files & strictly adhering to the working length , irrigation with 2.5% sodium hypochlorite, and 6% Gutta Percha for obturation will be used . All treated tooth will be de-occluded post obturation. Informed consent of the patient will be taken prior to the treatment.

The data obtained will be analysed statistically for any significant post operative pain in single sitting endodontic treatment in  non vital tooth after 12, 48, 72 hrs evaluation and between the group.