After testing, a pure adhesive failure
is essential, otherwise, the given data cannot be used to determine the adhesive strength as a function of the degree of melting at the interface.
The structure of the worn cutting nose tip is distinctive, proving that adhesive failure
starts preferably in the binder continuing by the extraction of carbides.
There are two modes of failure, including adhesive failure
and cohesive failure.
Failure modes were evaluated according to three categories: adhesive failure
(no root canal sealer on the dentin surface), cohesive failure (surface of the dentin was covered with sealer), and mixed failure (cohesive and adhesive failure
Using this we hope to build up an understanding of factors which result in cohesive rather than adhesive failure
The freezing and thawing (wet and dry) cycles can allow water to seep in via roof seams and adhesive failure
can occur when wood is exposed to water.
Three types of failure were categorized: adhesive failure
(failure was at the sealer/dentin interface), cohesive fracture (failure was entirely within the sealer), and mixed (failure in both the sealer and dentin).14
Cohesive failure (C) occurred within substrate or repair material, while adhesive failure
(A) if it occurred at repair interface.
When the left of the equation reaches the value of [G.sub.C], the initial crack begins to propagate and finally leads to adhesive failure
Each sample was evaluated at 56 x magnification and put into one of the categories according previous studies : (i) adhesive failure
either at the sealer/dentin or between the sealer/core interfaces at the, (ii) cohesive failure within the filling material, and (iii) mixed failure in both adhesive and cohesive modes.
Three predominant failure modes were observed: adhesive failure
, cohesive failure, and mixed cohesive/adhesive failure.
was the second most observed, ranging from 15-25%.