J Korean Acad Conserv Dent.  2008 Mar;33(2):107-114. 10.5395/JKACD.2008.33.2.107.

A comparative study on radiopacity of canal filling and retrograde root-end filling materials

• Kim YS
• Kim SK
• Hwang YC
• Hwang IN
• Oh WM

• KMID: 1986755
• DOI: http://doi.org/10.5395/JKACD.2008.33.2.107

Abstract

This study was performed to assess the radiopacity of a variety of canal filling and retrograde root-end filling materials according to the specification concerning root canal obturation materials. Ten materials including Gutta-percha pellets, amalgam, Fuji II LC, Dyract(R) AP, Super EBA(R), IRM(R), AH 26(R), Sealapex(TM), Tubli-Seal(TM) and dentin were evaluated in this study. In the first part, densitometric reading of an each step of aluminum step wedge on occlusal film were performed at 60 kVp (0.2, 0.3, 0.4 s), 70 kVp (0.2, 0.3, 0.33 s) to decide appropriate voltage and exposure time. In the second part, ten specimens which are 5 mm in diameter and 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 mm in thickness, were fabricated from each material studied. The specimens were radiographed simultaneously with an aluminum step wedge under decided condition (60 kVp, 0.2 s). The mean radiographic density values of the materials were transformed into radiopacity expressed equivalent thickness of aluminum (mm Al). The following results were obtained. 1. Among the various conditions including 0.2 s, 0.3 s, 0.4 s at 60 kVp and 0.2 s, 0.3 s, 0.33 s at 70 kVp, the appropriate voltage and exposure time that meet the requirement of density from 0.5 to 2.0 was 0.2 s at 60 kVp. 2. All of the materials in this study had greater radiopacity than the minimun level recommended by ISO No. 4049 standards. 3. Most of the materials had greater radiopacity than 3 mm Al requirement of ANSI/ADA specification No. 57 (2000) and ISO No. 6876 (2001) standards except for Fuji II LC and Dyract. It suggests that all experimental canal filling and retrograde root-end filling materials have a sufficient radiopacity that meet the requirement concerning root canal obturation materials except for Fuji II LC and Dyract.

Keyword

Radiopacity; Aluminum step wedge; Canal filling; Retrograde root-end filling materials

MeSH Terms

Aluminum
Compomers
Dentin
Glass Ionomer Cements
Gutta-Percha
Resins, Synthetic
Root Canal Obturation
Aluminum
Compomers
Glass Ionomer Cements
Gutta-Percha
Resins, Synthetic

Figure

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  Figure 1 A radiograph showing the radiopacities of each experimental material and dentin and their equivalence to those of the aluminum step wedge.

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  Figure 2 Standard curve for the optical density of the aluminum step wedge at 60 kVp, 0.2 s.

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  Figure 3 Radiopacities expressed in mean equivalent aluminum thicknesss for experimental materials in comparision with dentin.

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