title: [Comparative study of sealing ability and fracture resistance of roots endodontically treated with bonded and unbonded filling materials].
abstract: OBJECTIVE
  To compare the sealing ability and fracture resistance of roots endodontically treated with bonded and unbonded filling materials.
  
  
  METHODS
  One hundred and fifteen straight mandibular premolar teeth with single canal were divided randomly into 6 experimental groups, with 15 samples each, and 3 control groups. The sealing ability was evaluated using a glucose quantitative microleakage mode and fracture resistance was tested by universal testing machine.
  
  
  RESULTS
  The microleakage results showed that the bonded filling material had the lowest value while the unbonded filling material had the highest value in all groups. There were significant differences in microleakage value among the groups (P < 0.01), but no significant difference was noted in the fracture resistance among the testing groups (P = 0.7016).
  
  
  CONCLUSIONS
  Bonded filling material enhanced the sealing ability but could not reinforce the fracture resistance of endodontically treated teeth.
authors.affiliation: Department of Cariology and Endodontology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China. lingjunqi@163.com
authors.forename: Jun-Qi
authors.initials: JQ
authors.lastname: Ling
authors.forename: Zheng-Mei
authors.initials: ZM
authors.lastname: Lin
authors.forename: Ashroy
authors.initials: A
authors.lastname: Jhugroo
authors.forename: Shao-Feng
authors.initials: SF
authors.lastname: An
mesh_terms: D006801:Humans; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation
chemical_list: D012387:Root Canal Filling Materials