A diode laser (Sirolaser blue laser system, Sirona Dental Systems GmbH, Fabrikstraße 31, 64625 Bensheim, Germany) Wavelength 660 nm will be used, and the laser parameters will be set as follows: Power 0.1 W, energy 6 J, Continuous wave; energy Tip area 0.5 cm2, fluence 12 J/cm2 will be applied to the surface of the pulp stumps for 60 seconds. The pulp chamber will then be filled with reinforced zinc oxide-eugenol (IRM, Dentsply, Mount Waverley, Australia) to ensure proper sealing.

Then, each tooth in both groups will finally be restored with a stainless-steel crown (SSC)40 (3M/ESPE, St. Paul, Minn., USA) in the same visit, which will be cemented onto the tooth using glass ionomer cement.

Finally, reapplication of laser with the same parameters will be done around inserted crowns to promote tissue healing and decrease post operative pain.

Patients will be assessed and the presence of any adverse clinical signs or symptoms pain, or swelling will be considered clinical criteria of failure

Periapical x-ray will be performed and the presence of any any periapical radiolucency, furcation involvement, widening of periodontal ligament space (PDL), and pathologic internal/external root resorption will be considered radiographic failure.

Tissue healing after stainless steel crown (SSC) insertion will be assessed according to gingival index scale to determine the gingival condition around the inserted SSC. The adopted Löe and Silness gingival index scale ranges from 0 to 3 for the buccal, lingual, mesial and distal surfaces, and will be scored as follows: 0 indicates no inflammation and healthy gums; 1 indicates mild inflammation where there is slight color changes, slight edema and no bleeding on probing; 2 indicates moderate inflammation where there is edema with slight redness and bleeding upon probing; and 3 indicates severe inflammation where there is severe edema, redness, presence of ulceration and a tendency for spontaneous bleeding.