title: An in vitro comparison of three delivery techniques for obturation of root canals in primary molars.
abstract: OBJECTIVE
  This in vitro study evaluated the efficacy of three different obturation techniques with regards to quality of two filling pastes-Ca(OH)2/iodoform syringe paste and zinc oxide eugenol paste in primary molars.
  
  
  METHODS
  Root canals of 45 extracted primary molars were prepared and randomly divided into three groups of 15 teeth each. Group A-canals were filled with Ca(OH)2/iodoform syringe paste, Group B-zinc oxide eugenol paste with handheld lentulo spiral and Group C-zinc oxide eugenol paste with rotary lentulo spiral. The quality of filled root canals was evaluated with conventional radiography in antero-posterior and lateral dimensions.
  
  
  RESULTS
  There were significant differences between all groups in the presence of voids (p = 0.03) and length of filling (p = 0.002). Half of the sampled teeth in handheld lentulo spiral group had voids in the filled canals, while 80% of the teeth filled with Ca(OH)2/iodoform syringe resulted in overfilling of the paste.
  
  
  CONCLUSIONS
  All three delivery methods for the obturation of primary molars' root canals showed inherent limitations in terms of voids and quality of filling. Voids are inevitable and were present in all the techniques. Overfilling was more frequently seen with the syringe method, while the lentulo spiral technique, both handheld and rotary, showed a better quality of filling.
authors.affiliation: Department of Growth and Development, College of Dentistry, Ajman University of Science and Technology, Ajman, United Arab Emirates. ttww@yahoo.com.
authors.forename: T
authors.identifier: http://orcid.org/0000-0002-8144-7490
authors.initials: T
authors.lastname: Walia
authors.affiliation: General Dentist, Islamic Azad University of Tehran, Tehran, Iran.
authors.forename: A H
authors.initials: AH
authors.lastname: Ghanbari
authors.affiliation: Department of Growth and Development, College of Dentistry, Ajman University of Science and Technology, Ajman, United Arab Emirates.
authors.forename: S
authors.initials: S
authors.lastname: Mathew
authors.affiliation: General Dentist, Islamic Azad University of Tehran, Tehran, Iran.
authors.forename: A H
authors.initials: AH
authors.lastname: Ziadlou
mesh_terms: D002126:Calcium Hydroxide; D006801:Humans; D006847:Hydrocarbons, Iodinated; D066298:In Vitro Techniques; D008963:Molar; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D014094:Tooth, Deciduous; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D006847:Hydrocarbons, Iodinated; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C010473:iodoform; D002126:Calcium Hydroxide
keywords: Calcium hydroxide; Obturation; Primary molars; Pulpectomy; Zinc oxide eugenol