title: The effect of temporary restorative materials on fracture resistance of endodontically treated teeth.
abstract: This study was designed to investigate the fracture strength of endodontically treated teeth temporarily restored with some commonly used interim materials. Of 90 extracted maxillary premolars used in this study, 15 were left intact as the positive control. Endodontic treatment was performed on the remaining 75 teeth. The endodontically treated teeth were then randomly assigned to 5 groups (n = 15). One group was not restored and served as the negative control. In the remaining 4 experimental groups, the teeth were restored with a temporary cement: Zonalin, IRM, Coltosol, or Fuji II LC resin-modified glass ionomer (RMGI). The fracture strengths of all teeth were measured with a universal testing machine. The fracture strength of teeth restored with RMGI was significantly greater than that of other groups (P < 0.001), including intact teeth (P = 0.025). The fracture strength of teeth restored with other temporary materials was significantly lower than that of intact teeth (P < 0.05) but not significantly different from that of the negative control. From a structural resistance standpoint, RMGI may be the best choice for short-term temporary restoration of endodontically treated teeth. Other types of temporary restorative material had no reinforcing effect on tooth structure.
authors.forename: Amin Salem
authors.initials: AS
authors.lastname: Milani
authors.forename: Mohammad
authors.initials: M
authors.lastname: Froughreyhani
authors.forename: Hosein
authors.initials: H
authors.lastname: Mohammadi
authors.forename: Fatemeh Ghasemi
authors.initials: FG
authors.lastname: Tabegh
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Pournaghiazar
mesh_terms: D002133:Calcium Sulfate / Q000627:therapeutic use; D003764:Dental Materials / Q000627:therapeutic use; D003794:Dental Restoration, Temporary; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000627:therapeutic use; D006801:Humans; D008768:Methylmethacrylates / Q000627:therapeutic use; D012117:Resins, Synthetic / Q000627:therapeutic use; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital / Q000150:complications*; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use; D019287:Zinc Sulfate / Q000627:therapeutic use
chemical_list: C504942:Coltosol F; D003764:Dental Materials; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008768:Methylmethacrylates; D012117:Resins, Synthetic; D015035:Zinc Oxide-Eugenol Cement; C031667:IRM cement; D019287:Zinc Sulfate; D002133:Calcium Sulfate
keywords: Coltosol; Fuji II LC; IRM; Zonalin; endodontic treatment; fracture strength; resin-modified glass ionomer