This study is designed to compare between MTA Pulpotomy (Removal of coronal pulp tissue, placing MTA and covering with Stainless steel crown) Versus Conventional Pulpectomy (Removal of radicular pulp tissue, placing Zinc Oxide/Eugenol and covering with Stainless steel crown) in irreversible pulpitis in primary second molars.

Inclusion Criteria:

• Patients:
• Aged 4-7 years, cooperative, in good general health and medically within normal
• Teeth:
• Restorable mandibular second primary molars.
• History of irreversible pulpitis.
• Preoperative radiograph:
• Absence of periapical or inter-radicular radiolucency.
• Absence of widening of periodontal ligaments (PDL) space.
• Absence of internal or external root resorption.

Exclusion Criteria:

• Patients:
• With systemic disorders.
• Physical or mental disabilities.
• Unable to attend follow- up visits.
• Refusal of Participation.
• Refusal to sign the informed consent.
• Teeth:
• Previously accessed teeth.
• Mobile mandibular second primary molar.
• Swelling in the vestibule or on palpation.
• Pain on percussion.