The aim of clinical trial is to see is there any difference in the outcome of healing of the intraoral sinus tract when treat in single or multi-visit root canal treatment by an endodontist.

Methods and material :

Inclusion criteria as follows:

Tooth with a sinus tract and radiographic evidence of periradicular bone destruction, Tooth with a necrotic pulp confirmed by pulp tests or with previous root canal treatment, Tooth that was restorable and had an indication for root canal treatment or retreatment, Tooth with a mobility score <3 Absence of periodontal pockets >4 mm deep Patients without significant systemic disease.

Two groups will be divided into:

Group A: will treat in a single visit. The treatment protocol will be: cleaning and shaping by NITI file ( pro taper gold ) with Naocl 5.25%, EDTA 17% and saline then the canal will be obturate by single cone technique with bioceramic sealer.

Group B: will treat in a multi-visit. The treatment protocol will : cleaning and shaping by NITI file ( pro taper gold ) with Naocl 5.25%, EDTA 17% and saline then ca(oh)2 use as Intracanal medication the after disappear the sinus tract the canal will obturate by single cone technique with bioceramic sealer.

Follow-up examinations were performed at 7, 14, and 30 days postoperatively.

According to the clinical, the outcome was classified as:

1. Healed: the sinus tract disappeared completely.
2. Healing: the sinus tract getting smaller and can't be traced with small gutta-percha ( we need to mention GP size)
3. failed: the sinus tract persisted more than 30 days after treatment

Inclusion Criteria:

Tooth with a sinus tract and radiographic evidence of periradicular bone destruction, Tooth with a necrotic pulp confirmed by pulp tests or with previous root canal treatment, Tooth that was restorable and had an indication for root canal treatment or retreatment, Tooth with a mobility score <3 Absence of periodontal pockets >4 mm deep Patients without significant systemic disease.

Exclusion Criteria:

Tooth without a sinus tract . Tooth that was not restorable Tooth with a mobility score >3 Absence of periodontal pockets <4 mm deep Patients with significant systemic disease.

To see is there any significate difference in gender