An evaluation of the effect of blood and human serum on the surface microhardness and surface microstructure of mineral trioxide aggregate

Nekoofar, Mohammad Hossein; Oloomi, Kaveh; Sheykhrezae, M. S.; Tabor, Rachel K.; Stone, David C.; Dummer, P. M. H.

doi:10.1111/j.1365-2591.2010.01750.x

Cited by 68 publications

(79 citation statements)

References 38 publications

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“…Blood contamination has a detrimental effect on the surface micro-hardness of MTA. If blood or serum contamination is unavoidable, white MTA [68] may be preferred because it had higher surface hardness.…”

Section: Comparison Of White and Grey Mta Productsmentioning

confidence: 98%

Introduction to Mineral Trioxide Aggregate

Deus

Camilleri

Primus

et al. 2014

Mineral Trioxide Aggregate in Dentistry

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Section: Comparison Of White and Grey Mta Productsmentioning

confidence: 98%

Introduction to Mineral Trioxide Aggregate

Deus

Camilleri

Primus

et al. 2014

Mineral Trioxide Aggregate in Dentistry

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“…An acidic environment [ 120 ], blood and serum contamination [ 123 ], and low temperatures [ 151 ] reduced the microhardness of MTA. Alternatively, MTA microhardness was improved by reducing the particle size of the MTA powder which increased the surface area of the material [ 146 ].…”

Section: Microhardnessmentioning

confidence: 99%

“…A variety of factors such as surrounding pH [ 101 , 120 ], material thickness [ 112 ], mixing techniques [ 122 ], condensing pressure [ 121 ], powder particle size [ 146 ], etching [ 96 ], blood and serum contamination [ 123 ], and temperature [ 151 ] can affect MTA…”

Section: Microhardnessmentioning

confidence: 99%

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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“…In 2002,a tooth coloured version of MTA was introduced, commonly referred to as white MTA [4]. MTA was originally developed for the repair of root perforations but is increasingly being used in a wide range of clinical treatments, such as a root-end filling material after root-end resection, as an apical barrier in immature teeth, as a pulp capping agent during vital pulp therapy and pulpotomy in primary and permanent teeth, as a repair material in tooth resorption and as a root canal filling material in the coronal section of horizontally fractured teeth [7]. MTA and Portland cement have the same chemical elements, but Portland cement is not used as they donot possess the property of radiopacity though it has excellent physicochemical properties [8].…”

Section: Introductionmentioning

confidence: 99%