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748153 
Journal Article 
Ytterbium trifluoride as a radiopaque agent for dental cements 
Collares, FM; Ogliari, FA; Lima, GS; Fontanella, VRC; Piva, E; Samuel, SMW 
2010 
Yes 
International Endodontic Journal
ISSN: 0143-2885
EISSN: 1365-2591 
43 
9 
792-797 
English 
20579134 
WOS:000280635900007 
AIM: To evaluate the radiopacity, degree of conversion (DC) and flexural strength of an experimental dental cement, with several added radiopaque substances.

METHODOLOGY: Titanium dioxide, quartz, zirconia, bismuth oxide, barium sulphate and ytterbium trifluoride were added to the experimental cement in five different concentrations. Radiopacity was evaluated with a phosphor plate system, and the radiodensity of specimens was compared with an aluminium step-wedge. DC was evaluated with FT-infrared spectroscopy following 20 s of photo-activation. Specimens with dimensions of 12 x 2 x 2 mm were used for the flexural strength test. Data were analysed with two-way anova and Tukey's post hoc test.

RESULTS: Radiopacity of the experimental dental cements with barium sulphate and bismuth oxide at 40% and ytterbium fluoride at 30% and 40% showed no significant differences in comparison with 3 mm of Al (181, 96).

CONCLUSIONS: The experimental dental cements with at least 30% added ytterbium trifluoride had satisfactory radiopacity without influencing other properties. 
barium sulphate; bismuth oxide; dental cement; radiopacity; root canal sealants; ytterbium trifluoride