Effect of Bismuth Oxide Radioopacifier Content on the Material Properties of an Endodontic Portland Cement–based (MTA-like) System

Coomaraswamy, Kristian; Lumley, P. J.; Hofmann, Michael

doi:10.1016/j.joen.2006.11.018

Cited by 207 publications

(221 citation statements)

References 18 publications

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“…MTA's radiopacifier is bismuth oxide, which promotes radiopacity when associated with PC 10,11) . Notwithstanding, bismuth oxide may increase PC's porosity, damaging the longevity of the material 7,8) . The results of the present study showed that the addition of ZrO 2 micro to PC promotes proper radiopacity, as showed by Húngaro Duarte 10) and Bortoluzzi et al 11) .…”

Section: Discussionmentioning

confidence: 99%

“…The high pH of MTA can be attributed to the higher solubility of this material. According to Coomaraswamy et al 8) , the association of bismuth oxide with PC results in failures in the cement matrix which increases the porosity of the material, leading to a greater solubility and degradation.…”

Section: Discussionmentioning

confidence: 99%

“…However, it is related that this substance interferes with the hydration mechanism of MTA and calcium hydroxide precipitation in the hydrated cement 7) . Furthermore, the association of BO changes the microstructure of the cement matrix 8) , and increases the porosity and solubility of the Portland cement reducing its resistance 8,9) .…”

Section: Introductionmentioning

confidence: 99%

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Radiopacity, pH and antimicrobial activity of Portland cement associated with micro- and nanoparticles of zirconium oxide and niobium oxide

et al. 2014

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The aim of this study was to evaluate some properties of the calcium silicate materials Mineral Trioxide Aggregate (MTA) and Portland cement (PC) with microparticulated (micro) and nanoparticulated (nano) zirconium oxide (ZrO 2 ) or niobium oxide (Nb 2 O 5 ). The experimental materials: White PC (PC), MTA-Angelus ® (MTA), PC+ZrO 2 micro, PC+ZrO 2 nano, PC+Nb 2 O 5 micro and PC+Nb 2 O 5 nano were submitted to radiopacity and pH evaluations. Furthermore, the antimicrobial activity against different microorganisms was assessed by agar diffusion test. MTA presented higher radiopacity than other materials. However, all materials except PC presented higher radiopacity than recommended by ISO/ADA. MTA promoted higher pH values in all analyzed periods (p≤0.05). At the initial periods, PC and PC+ZrO 2 micro showed pH similar to MTA. All materials showed antimicrobial activity against the evaluated microorganisms. In conclusion, ZrO 2 and Nb 2 O 5 could be alternative radiopacifiers to be added to calcium silicate materials.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Radiopacity, pH and antimicrobial activity of Portland cement associated with micro- and nanoparticles of zirconium oxide and niobium oxide

et al. 2014

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“…The lack of radiopacity in pure PC is due to the absence of bismuth, a chemically inert radiopacifi er, in its composition. 25 However, this feature compromises neither the execution of pulpotomy procedures with PC nor their follow-up assessments, which is not the case when this material is used for root-end fi llings. In these situations, a radiopacifi er is necessary to enable the peri-and postoperative assessment of the cement placement reaching the root apex.…”

Section: Discussionmentioning

confidence: 99%

Pulpotomy of human primary molars with MTA and Portland cement: a randomised controlled trial

et al. 2009

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“…As well as preliminary tests for materials that are utilized for root-end filling, furcal perforation, and as apical barriers, such materials must be investigated for their biocompatibility characteristics, as toxic components present in them might induce irritation or even degeneration of the surrounding tissues, especially is they are accidentally extruded into the periradicular tissues (4,25). Portland cement and MTA have similar major constituents, except for bismuth oxide, which is added to MTA to provide radiopacity (11,26,27). Although this feature does not compromise the execution of pulpotomy procedures with PC and their follow-up assessments, this property is necessary in order to distinguish the material from surrounding anatomical structures such as tooth and bone (11,17,18,28), and to permit the material to achieve the minimum values recommended by the American National Standards Institute / American Dental Association (ANSI/ADA) standard No 57/2000 (29).…”

Section: Discussionmentioning

confidence: 99%

Biocompatibility of Portland cement combined with different radiopacifying agents

et al. 2014

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The aim of this study was to evaluate the response of rat subcutaneous tissue to Portland cement combined with two different radiopacifying agents, iodoform (CHI 3 ) and zirconium oxide (ZrO 2 ). These materials were placed in polyethylene tubes and implanted into the dorsal connective tissue of Wistar rats for 7 and 15 days. The specimens were then stained with hematoxylin and eosin, and inflammatory reaction parameters were evaluated by light microscopy. The intensity of the inflammatory response to the sealants was analyzed by two blind calibrated observers throughout the experimental period. Histological analysis showed that all the materials caused a moderated inflammatory reaction at 7 days, which then diminished with time. At 15 days, the inflammatory reaction was almost absent, and fibroblasts and collagen fibers were observed indicating normal tissue healing. The degrees of the inflammatory reaction on different days throughout the experimental period were compared using the non-parametric Kruskal-Wallis test. Statistical analysis demonstrated no significant differences amongst the groups, and Portland cement associated with radiopacifying agents gave satisfactory results. Therefore, Portland cement used in combination with radiopacifying agents can be considered a biocompatible material. Although our results are very encouraging, further studies are needed in order to establish safe clinical indications for Portland cement combined with radiopacifying agents. (J Oral Sci 56, 29-34, 2014)

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Effect of Bismuth Oxide Radioopacifier Content on the Material Properties of an Endodontic Portland Cement–based (MTA-like) System

Cited by 207 publications

References 18 publications

Radiopacity, pH and antimicrobial activity of Portland cement associated with micro- and nanoparticles of zirconium oxide and niobium oxide

Radiopacity, pH and antimicrobial activity of Portland cement associated with micro- and nanoparticles of zirconium oxide and niobium oxide

Pulpotomy of human primary molars with MTA and Portland cement: a randomised controlled trial

Biocompatibility of Portland cement combined with different radiopacifying agents

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