Inclusion Criteria:  Age: 4-7 years. Free medical history. Complete physical and mental health. Patient cooperation restorable mandibular primary molars  Exclusion Criteria:  Clinical symptoms or irreversible pulpitis as (spontaneous pain, throbbing pain) Soft tissue swelling, draining fistula or sinus tracts. Tenderness to percussion. Pathological Tooth mobility. Widening of periodontal membrane space