Biomedical Engineering Reference
In-Depth Information
FIGURE 4.12
Microhardness impressions using Vickers (A) and Knoop (B) indenters of Supreme XT and Grandio,
respectively.
Source: Rogério, Rigo, and Mota (2006).
120
100
80
60
40
20
Mechanical Load
0
Control
Supreme
XT
Esthet-X
Venus
FIGURE 4.13
Comparative graph of Knoop microhardness of nanofilled composites
when submitted up to 300,000 cyclic loads.
Source: Rigo and Mota (2009).
compositions of the materials. Two main methods are described in the literature: Vickers or Knoop.
Vickers indenter is associated to brittle materials and use a square-shaped indenter tip (
Figure 4.12A
).
However, some researchers classify composite resins as elastic materials due to the organic phase and
use Knoop point with “V” shape (
Figure 4.12B
).
The potential resistance to wear is mainly explained by hardness. Resin composites fillings in
functional areas are more susceptible to abrasion. In
Figure 4.13
, the exclusively nanofilled composite
