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Both bleaching systems significantly reduced microhardness
of both composite groups.
The microstructural and microhardness
analysis has been carried out for joint with maximum strength.
measurements were performed on an AMH43 automated hardness indenter.
SUMMARY--The aim of the study was to determine microhardness
of high- and low-viscosity bulk-fill composite resins and compare it with conventional composite materials.
Figure 7 shows the effect of the percentage of reinforcement and compaction pressure in each of the compounds on the microhardness
, measured with "Vickers" scale, considering that this mechanical property can predict the behaviour of the sintered against wear resistance.
Recently  the microindentation or microhardness
technique has been also very useful to elucidate the microstructure of multilayered systems based on blends of poly(ethylene terephthalate) (PET)/poly(ethylene naphthalene 2,6-dicarboxylate) (PEN)/clay nanocomposites.
This electronic processing of elements with optical ceramics without heating leads to increase their microhardness
, streamline and strengthen the structure by forming the surface layers of compressive stresses and thereby to increase the strength of products to thermal shock effects, which they are exposed to in operation.
Interior and Surface Microhardness
(Test Code: L1 and L5)
The trend of nanohardness and microhardness
profiles in the intermediate area between the inner layers with constant hardness and abnormal area gives information on structural heterogeneity .
From the micromechanical point of view, measurements of Vickers microhardness
and modulus of elasticity are carried out in a microhardness
testing machine (CSM Instrument, Switzerland), using 100 g load applied for 20 s (dwell time).
This coating demonstrated enhanced hardness (pencil hardness = 7H and microhardness
= 626 MPa) and toughness (excellent flexibility of 5 mm in the mandrel bend test).