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

Yong-Sang Kim; Seo-Kyong Kim; Yun-Chan Hwang; In-Nam Hwang; Won-Mann Oh

doi:10.5395/JKACD.2008.33.2.107

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Original Article A comparative study on radiopacity of canal filling and retrograde root-end filling materials: Yong-Sang Kim, Seo-Kyong Kim, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh; Journal of Korean Academy of Conservative Dentistry 2008;33(2):107-114.
DOI: https://doi.org/10.5395/JKACD.2008.33.2.107
Published online: March 31, 2008

Department of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University, BK21, Korea.

Corresponding Author: Won-Mann Oh. Department of Conservative Dentistry, School of Dentistry, Chonnam National University, 8 Hak-dong, Dong-gu, Gwangju 501-757, Korea. Tel: 82-62-220-4431, Fax: 82-62-225-8387, wmoh@chonnam.ac.kr

• Received: January 24, 2008 • Revised: February 22, 2008 • Accepted: March 6, 2008

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Abstract
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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® AP, Super EBA®, IRM®, AH 26®, Sealapex™, Tubli-Seal™ 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.
Keywords: Radiopacity; Aluminum step wedge; Canal filling; Retrograde root-end filling materials

REFERENCES

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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.

Figure 2

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

Figure 3

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

Table 1

Mean values and standard deviations of the radiopacity values in terms of equivalent thickness of aluminum for the experimental materials

Tables & Figures

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

J Korean Acad Conserv Dent. 2008;33(2):107-114. Published online March 31, 2008

DOI: https://doi.org/10.5395/JKACD.2008.33.2.107

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Figure

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

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

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

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

Figure 1

Figure 2

Figure 3

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

Table 1

Mean values and standard deviations of the radiopacity values in terms of equivalent thickness of aluminum for the experimental materials

Table 1 Mean values and standard deviations of the radiopacity values in terms of equivalent thickness of aluminum for the experimental materials