Clinical Evaluation of Silver Nanoparticles in Comparison to Silver Diamine Fluoride in Management of Deep Carious Lesions

Inclusion Criteria: * success will be evaluated by: 1. Cold pulp testing: An ice-rod will be used for this test. Results should be positive or negative. 2. Absence of spontaneous pain: Post-operative pain will be assessed using the visual Analogue Scale Score (VAS), which is a measurement method for subjective characteristics of pain. Respondents specify their level of agreement to a statement by indicating a position along a 10 cm line between two end-points, with the term "no sensitivity" at one end and "intolerable sensitivity" at the other end. A score from (0 to 10 is given). 3. Sensitivity to percussion: (presence/ absence). 4. Inspection for Sinus/fistula/swelling: using visual inspection (presence/ absence). 5. Radiographic examination: Indicating presence of periapical radiolucencies, widening of lamina dura, internal and external root resorption (presence/ absence). Exclusion Criteria: * Patient-related criteria: * Medically compromised patients, who will not be able to attend multiple appointments or may require special management. * Pregnant women; as radiographs cannot be taken for them. * Allergy to any of the restorative materials, including anesthetics. * Uncooperative patients, will not abide by the instructions or attend the appointments. Tooth related criteria: * Retained deciduous teeth; as the study is targeting only permanent teeth. * Teeth with previous restorations, which may add another variable to the study (type of old restorative material, extent of recurrent caries. * Teeth with cervical caries; which can't be evaluated on periapical radiographs