Ocena in vitro właściwości materiałowych Biodentine w porównaniu z ProRoot MTA
For the measurement of the microhardness one polished cement surface of each sample was loaded with a diamond indenter point (Durimet, Germany) with a weight of 100 g for 30 s to produce a stamp mark in a homogeneous region of the cement surface. The diamond indenter produced one impression with two orthogonal diagonals equal in length which were measured immediately after discharge. The microhardness was calculated as following:
where F = load in Newton, 0.1891 = Vickers constant; d = arithmetic mean of the two diagonals, A = impression surface in mm2, HV = Vickers hardness.
Each cement sample was measured at five defined points resulting in 50 measurements per cement and a total
of 100 measurements.
Radiopacity
For sample preparation stainless steel ring moulds having an internal diameter of 10.0 mm (± 0.1 mm) and a height of 1.0 mm (± 0.1 mm) were used according to ISO 6876:2001 [16].
Per cement ten samples were produced and allowed to set for 24 h. From each cement one sample was placed on a dental x-ray film (Kodak Insight Dental Film, Film Speed E, LOT 3110641, Carestream Dental, Rochester, NY, USA) together with an aluminium step wedge (1–9 mm). The x-ray exposures were made using a Sirona Heliodent DS [...]
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