Dental Pulp Necrosis Humans 8 human 8 tooth pulp disease 8 Child 4 Metronidazole 4 antiinfective agent 4 child 4 metronidazole 4 Anti-Bacterial Agents 3 Ciprofloxacin 3 Female 3 Male 3 Root Canal Filling Materials 3 ciprofloxacin 3 female 3 male 3 root canal filling material 3 Barium Sulfate 2 Child, Preschool 2 Dental Pulp 2 Drug Combinations 2 Endodontics 2 Incisor 2 Regenerative Endodontics 2 Root Canal Irrigants 2 Root Canal Therapy 2 Tooth, Deciduous 2 barium sulfate 2 biomedical and dental materials 2