title: A clinical and radiographic study of four different root canal fillings in primary molars.
abstract: BACKGROUND
  Successful treatment of infected primary teeth aims to preserve the child's health. However, the complex morphology of primary root canals and the desire for shorter therapy sessions put the necessity to search for the ideal root canal paste.
  
  
  OBJECTIVE
  To evaluate pulpectomy of nonvital primary molars using four different root canal filling pastes zinc oxide and propolis (ZOP) as a new paste, endoflas-chlorophenol-free as a new paste free of chlorophenol, metapex paste, and zinc oxide and eugenol (ZOE) paste as a control paste.
  
  
  METHODS
  Pulpectomy of 64 nonvital primary molars were accomplished in 39 children aged 3-9 years. Teeth were randomly divided into four equal groups of 16 molars according to the type of root canal filling. Pulpectomy was performed in one stage using 5.25% sodium hypochlorite irrigation and stainless-steel crown for final restoration. Clinical and radiographic results were evaluated double-blindly for two periods of 6, 12 months. Data were analyzed using Chi-square/Fisher's exact test, and P-value was set as 0.05.
  
  
  RESULTS
  The four pastes achieved convergent clinical and radiographic success within the two observation periods (P > 0.05). ZOE paste was the slowest in its resorption.
  
  
  CONCLUSIONS
  ZOP is a promising paste with its natural antibacterial component (propolis). ZOE paste had convergent efficacy to the other pastes.
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Damascus University, Damascus, Syria.
authors.forename: Alaa O
authors.initials: AO
authors.lastname: Al-Ostwani
authors.forename: Bashier M
authors.initials: BM
authors.lastname: Al-Monaqel
authors.forename: Mohamed K
authors.initials: MK
authors.lastname: Al-Tinawi
mesh_terms: D001466:Barium Sulfate; D002648:Child; D002675:Child, Preschool; D003442:Crowns; D004338:Drug Combinations; D006801:Humans; D006847:Hydrocarbons, Iodinated; D008963:Molar / Q000000981:diagnostic imaging / Q000601:surgery*; D011429:Propolis; D011670:Pulpectomy; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012388:Root Canal Irrigants / Q000627:therapeutic use; D012827:Silicone Oils; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D014094:Tooth, Deciduous; D019553:Tooth, Nonvital / Q000601:surgery*; D016896:Treatment Outcome; D015034:Zinc Oxide; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D004338:Drug Combinations; C098568:Endoflas F.S.; D006847:Hydrocarbons, Iodinated; C498115:Metapex; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D012827:Silicone Oils; D015035:Zinc Oxide-Eugenol Cement; D001466:Barium Sulfate; D011429:Propolis; D012973:Sodium Hypochlorite; D015034:Zinc Oxide