The aim of this study is to evaluate and compare the clinical effectiveness of zinc oxide-propolis mixture with triple antibiotic paste in LSTR as root canal filling material in necrotic primary molars.

The promising results of propolis as a natural antibiotic in previous in- vivo studies made it interesting to combine propolis to the golden standard zinc oxide eugenol as an intracanal medication in pulp affected primary molars and use this mix as a natural substitute to the modified triple antibiotic paste (m-TAP) and therefore overcoming the antibiotic bacterial resistance, allergy and developmental anomalies that might arise in permanent successor teeth from m-TAP usage.

Inclusion Criteria:

• Children:

  1. Cooperative children aged 4 -7 years old.
  2. Systemically healthy.

• Teeth:

Clinical criteria:

1. Necrotic primary mandibular second molar teeth.
2. Spontaneous pain or tenderness to percussion
3. Deep carious lesion with pulp exposure.
4. Presence of chronic apical abscess or sinus tract Tooth should be restorable. (Thakur et al., 2021)

Radiographic criteria:

1. Coronal-radiographic evidence of a deep carious lesions or lesion approximating pulp
2. Radicular discontinuity of lamina dura, furcation involvement less than or equal to half of shortest root in vertical dimension. (Thakur et al., 2021)

Exclusion Criteria:

• Children:

  1. With physical or emotional alteration.
  2. Children with systemic disease.
  3. Previous history of allergy to antibiotics used in the study.
  4. Children that will not attend follow up. • Teeth:
  1. Non restorable carious primary molars.
  2. Grade III mobility

Data may be provided upon request

Double