Imaging Sci Dent.  2018 Jun;48(2):97-101. 10.5624/isd.2018.48.2.97.

Radiopacity of contemporary luting cements using conventional and digital radiography

• An SY
• An CH
• Choi KS
• Huh KH
• Yi WJ
• Heo MS
• Lee SS
• Choi SC

• KMID: 2413920
• DOI: http://doi.org/10.5624/isd.2018.48.2.97

Abstract

PURPOSE
This study evaluated the radiopacity of contemporary luting cements using conventional and digital radiography.
MATERIALS AND METHODS
Disc specimens (N=24, n=6 per group, ø7 mm×1 mm) were prepared using 4 resin-based luting cements (Duolink, Multilink N, Panavia F 2.0, and U-cem). The specimens were radiographed using films, a complementary metal oxide semiconductor (CMOS) sensor, and a photostimulable phosphor plate (PSP) with a 10-step aluminum step wedge (1 mm incremental steps) and a 1-mm-thick tooth cut. The settings were 70 kVp, 4 mA, and 30 cm, with an exposure time of 0.2 s for the films and 0.1 s for the CMOS sensor and PSP. The films were scanned using a scanner. The radiopacity of the luting cements and tooth was measured using a densitometer for the film and NIH ImageJ software for the images obtained from the CMOS sensor, PSP, and scanned films. The data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests.
RESULTS
Multilink (3.44-4.33) showed the highest radiopacity, followed by U-cem (1.81-2.88), Panavia F 2.0 (1.51-2.69), and Duolink (1.48-2.59). The R² values of the optical density of the aluminum step wedge were 0.9923 for the films, 0.9989 for the PSP, 0.9986 for the scanned films, and 0.9266 for the CMOS sensor in the linear regression models.
CONCLUSION
The radiopacities of the luting materials were greater than those of aluminum or dentin at the same thickness. PSP is recommended as a detector for radiopacity measurements because of its accuracy and convenience.

Keyword

Dental Materials; Radiography; Dental Enamel; Dentin

MeSH Terms

Aluminum
Dental Enamel
Dental Materials
Dentin
Linear Models
Radiographic Image Enhancement*
Radiography
Semiconductors
Tooth
Aluminum
Dental Materials

Figure

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  Fig. 1 Optical density as a function of step thickness with the corresponding R2 value.

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  Fig. 2 Linear models for an aluminum step wedge with corresponding R2 values obtained from the CMOS sensor, PSP, and scanned film. CMOS, complementary metal oxide semiconductor; PSP, photostimulable phosphor plate.

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  Fig. 3 Equivalent aluminum thickness of the luting cements, enamel, and dentin in millimeter. CMOS, complementary metal oxide semiconductor; PSP, photostimulable phosphor plate.

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