Radiopacity and histological assessment of Portland cement plus bismuth oxide

Coutinho-Filho, Tauby de Souza; De‐Deus, Gustavo; Klein, Leila; Manera, Gisele; Peixoto, Carla; Gurgel‐Filho, Eduardo Diogo

doi:10.1016/j.tripleo.2008.07.028

Cited by 27 publications

(38 citation statements)

References 25 publications

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“…It also presents bismuth oxide which makes it radiopaque. [14][15][16][17][18] In vitro and in vivo investigations have shown that MTA has many properties such as excellent biocompatibility, an alkaline pH, radiopacity, a high sealing capacity and the fact that it hardens in the presence of humidity 2-4 h after mixing. MTA can also induce the formation of dentine, cement and bone.…”

Section: Introductionmentioning

confidence: 99%

Clinical study of Mineral Trioxide Aggregate in primary molars. Comparison between Grey and White MTA—A long term follow-up (84 months)

Cardoso-Silva

Barbería

Maroto

et al. 2011

Journal of Dentistry

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Section: Introductionmentioning

confidence: 99%

Clinical study of Mineral Trioxide Aggregate in primary molars. Comparison between Grey and White MTA—A long term follow-up (84 months)

Cardoso-Silva

Barbería

Maroto

et al. 2011

Journal of Dentistry

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“…Implantation of new endodontic materials into subcutaneous tissues of rats is one of the most suitable methods for determining their local effects and biocompatibility (2,9,10,(22)(23)(24). 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).…”

Section: Discussionmentioning

confidence: 99%

“…The overall mean value of the inflammatory reaction for each material was determined for each rat at each time point. Evaluation was performed according to a modified version of the Coutinho-Filho et al (22) criteria. The degree of inflammation was determined according to the type, number and concentration of the predominant cells.…”

Section: Methodsmentioning

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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“…Moreover, the histological evaluation suggested that all materials were biocompatible after 7 and 60 days [ 50 ]. However, the increase of bismuth oxide concentration is related to further deterioration of the material mechanical strength and increase in porosity [ 49 ].…”

Section: Radiopacitymentioning

confidence: 94%

Properties of Hydrated Mineral Trioxide Aggregate

Tanomaru-Filho

Guerreiro-Tanomaru

2014

Mineral Trioxide Aggregate in Dentistry

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MTA has been currently commercialized in two different forms, the gray (GMTA) and the white version (WMTA). In particular, the white MTA was developed due to the potential discoloration promoted by the gray version of the cement. The chemical composition of the MTAs is very similar to that of Portland cement despite the addition of components containing bismuth in the MTA's cements [ 91 , 128 ], which aims to confer radiopacity to the materials [ 34 ]. The mixture of the MTA powder with distilled water results in the formation of by-products, such as calcium hydroxide and calcium silicate hydrate gel [ 27 , 28 ] as discussed in Chap. 2 . The particular mechanism of hydration and the structure of the set material result in particular properties displayed by the set MTA.The initial pH of the MTA is approximately 10.2, but it increases to 12.5 after 3 h immersed in solution [ 177 ]. MTA has the ability to sustain high values of pH during long periods [ 75 ]. The high pH values exhibited by MTA are attributed to the constant release of calcium and the formation of calcium hydroxide.Several studies had reported release of calcium from MTA [ 12 , 74 , 131 ]. The calcium ion release is enhanced when calcium chloride is added as an accelerator to MTA [ 12 ]. Moreover, when MTA was placed into the root canals of teeth with simulated radicular resorption, a greater calcium ion release was detected in comparison to teeth not fi lled with MTA [ 131 ]. Setting TimeThe hydration of the MTA powder produces a colloidal gel, which solidifi es and results in a solid structure. MTA is prepared by mixing the powder with distilled water using a ratio of 3:1 (powder/distilled water) [ 184 ].

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Radiopacity and histological assessment of Portland cement plus bismuth oxide

Cited by 27 publications

References 25 publications

Clinical study of Mineral Trioxide Aggregate in primary molars. Comparison between Grey and White MTA—A long term follow-up (84 months)

Clinical study of Mineral Trioxide Aggregate in primary molars. Comparison between Grey and White MTA—A long term follow-up (84 months)

Biocompatibility of Portland cement combined with different radiopacifying agents

Properties of Hydrated Mineral Trioxide Aggregate

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