title: An in vitro comparison of effect on fracture strength, pH and calcium ion diffusion from various biomimetic materials when used for repair of simulated root resorption defects.
abstract: OBJECTIVE
  The aim of this study was to compare the effect on fracture strength, pH and calcium ion diffusion from mineral trioxide aggregate (MTA) Fillapex, iRoot SP, and Ultracal when used for repair of simulated root resorption defects.
  
  
  METHODS
  Three sets of 40 teeth each were used, and biomechanical preparation was done. Resorption cavity was made at 5 mm from the apex. Teeth were filled with different experimental materials. In control group, saline was used. Samples of fracture resistance were stored in an incubator for 3 months and then subjected to the universal testing machine. To evaluate the pH and calcium ion release were checked at 1 day and 1, 2, 3, and 4 weeks intervals. Data were recorded and statistical analysis done by one-way analysis of variance followed by post-hoc Tukey test.
  
  
  RESULTS
  Highest fracture resistance was seen in MTA Fillapex followed by iRoot SP, control, and then Ultracal group. Teeth filled with iRoot SP showed highest pH and calcium ion release followed by MTA Fillapex and Ultracal group.
  
  
  CONCLUSIONS
  Bioceramic sealers showed high pH, calcium ion release, and good root reinforcement potential. Initial dressing of calcium hydroxide followed by obturation with Gutta-percha and bioceramic sealer may be considered as an alternative treatment modality for inflammatory resorption.
authors.affiliation: Department of Conservative Dentistry and Endodontics, ITS-CDSR, Muradnagar, Ghaziabad, Uttar Pradesh, India.
authors.forename: Chetna
authors.initials: C
authors.lastname: Dudeja
authors.affiliation: Department of Conservative Dentistry and Endodontics, ITS-CDSR, Muradnagar, Ghaziabad, Uttar Pradesh, India.
authors.forename: Sonali
authors.initials: S
authors.lastname: Taneja
authors.affiliation: Department of Conservative Dentistry and Endodontics, ITS-CDSR, Muradnagar, Ghaziabad, Uttar Pradesh, India.
authors.forename: Manju
authors.initials: M
authors.lastname: Kumari
authors.affiliation: Department of Chemical Metrology, National Physical Laboratory, New Delhi, India.
authors.forename: Nahar
authors.initials: N
authors.lastname: Singh
keywords: Calcium ion diffusion; Ultracal; fracture strength; iRoot SP; mineral trioxide aggregate Fillapex; pH; universal testing machine