Evaluation of Radiopacity of Luting Cements Submitted to Different Aging Procedures

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,...

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Published in:Journal of prosthodontics 2018-12, Vol.27 (9), p.853-859
Main Authors: Junqueira, Rafael B., Carvalho, Rodrigo F., Yamamoto, Felipe A.G.F., Almeida, Solange M., Verner, Francielle S.
Format: Article
Language:English
Subjects:
Aging
Aluminum
Composite Resins - adverse effects
Composite Resins - chemistry
Data processing
Dental Cements - adverse effects
Dental Cements - chemistry
Dental digital radiography
Dentistry
Glass Ionomer Cements - adverse effects
Glass Ionomer Cements - chemistry
Humans
Optical density
Optical Phenomena
Radiography, Dental
resin cements
Resin Cements - adverse effects
Resin Cements - chemistry
Statistical analysis
Thermal cycling
Zinc phosphate
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Summary: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.
ISSN:1059-941X
1532-849X
DOI:10.1111/jopr.12989