title: A new in vitro method to evaluate radio-opacity of endodontic sealers.
abstract: OBJECTIVE
  To evaluate a new method for assessing the radio-opacity of endodontic sealers and to compare radio-opacity values with a well-established standard method.
  
  
  METHODS
  The sealers evaluated in this study were AH Plus(®) (Dentsply DeTrey GmbH, Konstanz, Germany), Endo CPM Sealer (EGEO SRL, Buenos Aires, Argentina) and MTA Fillapex(®) (Angelus Dental Products Industry S/A, Londrina, Parana, Brazil). Two methods were used to evaluate radio-opacity: (D) standard discs and (S) a tissue simulator. For (D), ten standard discs were prepared for each sealer and were radiographed using Digora(®) phosphor storage plates (Soredex; Orion Corporation, Helsinki, Finland), alongside an aluminium stepwedge. For (S), polyethylene tubes filled with sealer (n = 10 for each) were radiographed inside the simulator as described. The digital images were analysed using Adobe Photoshop(®) software v. 10.0 (Adobe Systems, San Jose, CA). To compare the radio-opacity among the sealers, the data were analysed by ANOVA and Tukey's test, and to compare methods, they were analysed by the Mann-Whitney U test. To compare the data obtained from dentin and sealers in method (S), Student's paired t-test was used (=0.05).
  
  
  RESULTS
  In both methods, the sealers showed significant differences, according to the following decreasing order: AH Plus, MTA Fillapex and Endo CPM. In (D), MTA Fillapex and Endo CPM showed less radio-opacity than aluminium. For all of the materials, the radio-opacity was higher in (S) than in (D). Compared with dentin, all of the materials were more radio-opaque.
  
  
  CONCLUSIONS
  The comparison of the two assessment methods for sealer radio-opacity testing validated the use of a tissue simulator block.
authors: 1 Department of Conservative Dentistry, Dental School, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil.
authors: V B
authors: VB
authors: Malka
authors: G L
authors: GL
authors: Hochscheidt
authors: N L
authors: NL
authors: Larentis
authors: F S
authors: FS
authors: Grecca
authors: V R C
authors: VR
authors: Fontanella
authors: P M P
authors: PM
authors: Kopper
mesh_terms: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D004853:Epoxy Resins; D008422:Materials Testing / Q000379:methods*; D010087:Oxides; D019252:Radiography, Dental, Digital; D012387:Root Canal Filling Materials; D017640:Silicates
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; C540763:Endo-CPM-Sealer; D004853:Epoxy Resins; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C534916:epoxy resin-based root canal sealer; C086631:mineral trioxide aggregate
keywords: dental; dental materials; radiography; root canal therapy
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