Accuracy of Artificial Intelligence Technology in Detecting Number of Root Canal of Human Mandibular Second Molar: Diagnostic Accuracy Experimental Study

Inclusion Criteria: \- A- Inclusion criteria: 1. Patients must be medically free from any systemic disease that can affect root canal treatment. 2. Age range of the patients should be 18-40 with permanent mandibular second molars indicated for root canal treatment. 3. No sex predilection. 4. Patients must have good oral hygiene. 5. restorable teeth. 6. Positive patient"s acceptance for participating in the study. 7. Patients able to sign informed consent. B- Exclusion criteria: 1. Lower second molars which are non-restorable, having large perforations, external root resorption, vertical root fracture, internal root resorption, grade 2/3 mobility, previous successful/non-successful root canal treatment 2. Pregnant women after taking detailed history and pregnancy test must be in the first visit. 3. Psychologically disturbed patients. Teeth that have: • Periodontally affected with grade 2 or 3 mobility. 12 • Not restorable teeth. • Abnormal anatomy and calcified canals. • Previous root canal treatment.