Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
EndodontologyOnline only articleEvaluation of the radiopacity and cytotoxicity of Portland cements containing bismuth oxide
Section snippets
Material preparation
Portland cement and bismuth oxide were mixed in the ratios of 4:1 (PcBo4), 6:1 (PcBo6), and 8:1 (PcBo8). Subsequently, PPc (1.0 g) and Portland cement containing bismuth oxide (PcBo, 1.0 g) were mixed with sterile distilled water (0.4 mL) on a glass slab. MTA was mixed according to the manufacturer’s recommendations. Five specimens (n = 10) measuring 10 mm in diameter and 1 mm in thickness were fabricated from each material tested. The material was packed into aluminum molds and stored for 3
Radiographic evaluation
The results demonstrated that MTA and PcBo4 presented the greatest radiopacity (P < .05) and were equivalent to 6.92 and 6.81 mm of aluminum, respectively. PcBo6 and PcBo8 presented radiopacity values that were equivalent to 3.70 and 3.17 mm of aluminum, respectively. PPc exhibited the lowest radiopacity (P < .05) and was equivalent to 0.86 mm of aluminum (Fig. 2).
Cytotoxicity test
As demonstrated in Fig. 3, the MTA and PPc groups showed statistically higher cell viabilities in 12 and 24 hours compared to other
Discussion
An ideal root-end filling material should exhibit sufficient radiopacity to allow for distinction from adjacent anatomical structures, to evaluate voids and improper contours, and to assess secondary dissolution of the material.11, 12, 13 While some materials possess an inherent radiopacity to a certain degree, others require radiopacifiers such as bismuth oxide and barium sulfate to optimize their radiopaque properties.13
The base material for MTA is Portland cement and bismuth oxide is added
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This paper was supported by Wonkwang University in 2007.