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Evaluation of Radiopacity of Luting Cements Submitted to Different Aging Procedures
Author(s) -
Junqueira Rafael B.,
Carvalho Rodrigo F.,
Yamamoto Felipe A.G.F.,
Almeida Solange M.,
Verner Francielle S.
Publication year - 2018
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12989
Subject(s) - radiodensity , materials science , temperature cycling , dentistry , radiography , medicine , thermal , surgery , physics , meteorology
Purpose To evaluate the radiopacity of luting cements submitted to different aging procedures. Materials and Methods Twenty discs (1 × 4 mm) of each of the following cements were prepared: zinc phosphate, RelyX Luting 2, Variolink 2, AllCem, RelyX U200, Multilink, Panavia F2.0, and RelyX ARC. Then, they were randomly divided into two groups (n = 10/group), according to the aging procedure: thermal cycling group and water storage group. Before and after aging procedures, specimens were x‐rayed with an aluminum step‐wedge (11 steps, 1 mm thick each) and three dental slices (1 mm thick). The radiopacity was evaluated by means of optical density, which was measured using ImageJ software. The values were converted into millimeters of aluminum with a logistic regression calibration curve. The data were analyzed by one‐way ANOVA and Tukey post‐hoc test (α = 0.05). Results In the thermal cycling group, RelyX Luting 2, RelyX U200, and Panavia F2.0 showed a statistically significant reduction in radiopacity ( p < 0.05). In the water storage group, all cements showed a significant reduction in radiopacity ( p < 0.05), and RelyX Luting 2 and Panavia F2.0 performed below the desired ISO 4049 standard. Conclusions The radiopacity of luting cements can decrease after aging, especially after 1‐year water storage.