BASIC RESEARCH-TECHNOLOGYRadiopacity of Endodontic Sealers: Development of a New Method for Direct Measurement
Section snippets
Sample Preparation
The list of endodontic sealers to be tested was compiled from the current literature and from commercial advertisement brochures (Table 1). The test materials were purchased from local suppliers and if they were not available, the manufacturer was kindly requested to send two packages of sealer from the current batch for an investigation of its physical properties. The materials were mixed in accordance with the manufacturers’ instructions whenever available and poured in a freshly mixed state
RESULTS
The empty background (including the glass carrier) gave a reading of 8 to 15 pixels. The graph constructed by plotting the number of pixels exhibited by the first 12 steps in the film against the aluminum thickness (in mm) of the step yielded a practically straight line. A new line was drawn, parallel to the first but 12 pixels lower to account for the mean base and fog of the film (Fig. 3). In view of its quasi linearity, it was possible to determine by extrapolation the radiopacity of the
DISCUSSION
The results are difficult to compare with those of previous studies of the radiopacity of endodontic sealers because only one (3) expressed the radiopacity of aluminum in mm, but the long list of tested materials contains few contemporary sealers. The radiopacity of those that are still in use tends to be similar to the presently measured value, albeit slightly lower: AH 26 only 6.66, Roth’s 801 sealer 4.41, versus 5.1. The other zinc-oxide-eugenol–based sealers without potent opacifiers such
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Evaluation of cytotoxicity and physicochemical properties of calcium silicate-based endodontic sealer MTA fillapex
2013, Journal of EndodonticsCitation Excerpt :Among other physical, chemical, and biological properties, the ideal root canal sealing material should have a certain degree of radiopacity to be clearly visible on radiographs and enhance the radiopacity of the root filling materials (16). International standards require a minimal radiopacity equivalent to 3.00 mm Al, yet some commercially available products do not meet this requirement (17). In this study, the radiopacity of both root canal sealers were found to be in agreement with ISO 6876/2001 recommendations (11).
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