Effects of Bone Graft Materials on the Microhardness of Mineral Trioxide Aggregate

Sato, Erick Y.; Whitten, Brian; Sedgley, Christine M.

doi:10.1016/j.joen.2012.02.019

Cited by 2 publications

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References 30 publications

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“…White MTA microhardness values when in contact with Bio-Oss (Geistlich Pharma, Princeton, New Jersey, USA), MinerOss (BioHorizons, Markham, Ontario, Canada) and Puros (Zimmer Dental, Carlsbad, California, USA) have been reported to be lower than those for OraGraft (Salvin Dental Specialities, Charlotte, North Carolina, USA) and control groups regardless of incubation period [ 53 ].…”

Section: Bone Grafting Materialsmentioning

confidence: 99%

Reactivity and Environmental Factors

Camilleri

Dummer

2014

Mineral Trioxide Aggregate in Dentistry

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Hydrated mineral trioxide aggregate (MTA) is composed of un-hydrated cement particles, which acts as a core around which a reaction rim of hydration products is formed ( Fig. 2.5 ). When mixed with water, the tricalcium and dicalcium silicate react forming calcium silicate hydrate (honeycomb appearance) and calcium hydroxide (hexagonal plates) (Fig. 2.6 ), which is leached in solution. The presence of calcium hydroxide has been verifi ed by X-ray diffraction analysis as it produces a typical peak for portlandite at 18° 2 θ (Fig. 2.9 ), whilst the leaching of calcium has been measured by inductively coupled plasma. The particular microstructure of MTA and the presence of calcium hydroxide in solution make the material susceptible to environmental factors. The use of MTA brings it into contact with other materials, tissues and fl uids, and a number of changes occur within or on the surface of the material in various environmental conditions. Effect of Environmental Factors on the Set MaterialMTA has a variety of applications mostly in Endodontics. These various uses have been discussed [ 60 ] and are outlined in Chap. 6 . Dental Materials Glass IonomerCovering MTA with glass ionomer cement when it is used as a pulp capping agent results in physical changes to the materials at their interface ( Fig. 5.1a ). A sizable gap has been observed at the interface attributed to the movement of water out of MTA into the glass ionomer. This movement of water out of MTA can inhibit its hydration and increases its porosity [ 9 ]. There is no evidence that covering MTA with a glass ionomer has an effect on the glass ionomer cement itself with regard to setting time and setting reaction [ 5 , 36 ]. However, migration of strontium from glass ionomer to MTA has been observed [ 9 ], although its effects are unknown. Base MaterialsZinc oxide eugenol-based cements are used as temporary fi lling materials and come into contact with MTA when it is used for pulp capping. Zinc is a retarder of cement hydration [ 47 ], and zinc salts form calcium hydrozincate (Ca(Zn(OH) 3 H 2 O) 2 ), an insoluble hydroxide in alkaline solution that creates a coating on MTA particles. In addition, zinc

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Section: Bone Grafting Materialsmentioning

confidence: 99%