How Do Dental Materials React On Tooth brushing?
Besides
the wear from occlusion, the influence of tooth brushing with and without
toothpastes on teeth and dental materials has been in focus of interest for
many years. Due to the wide range of test methods, comparisons of the results
from different studies are difficult.Different methods have been used in order
to evaluate abrasion. Both the quantitative aspect, i.e. how much of the
surface that has been abraded, and the qualitative aspect, i.e. the roughness
of the surface after brushing have been considered. Weight and Volume loss
techniques and radiotracer techniques, are examples of quantitative techniques,
while profilometer techniques and light
reflection techniques are examples of qualitative techniques.
To reduce the problem of shrinkage,
dimethylmethacrylate, i.e. bis-GMA (Bowen’s resin) was created. Bowen’s resin
is an important ingredient in the composite fillings of today.In recent years
dental filling materials containing amalgam have been replaced by composite
materials, which are now being used in all areas of the mouth. The composites
used in the anterior region often contain bis-GMA with filler particles 30-60%
by weight, while in the molar region the amount of filler particles can reach
83% by using hybrid composites. By using three different particle sizes the
filler load can be as high as 90%. The composites have during the years been
improved to withstand chewing forces in the molar region. They have also been
modified either to be used in the anterior or the posterior (molar) region of
the mouth. It is of utmost importance that these materials are not influenced
negatively by tooth brushing with toothpaste or water, since increased surface
roughness will lead to discoloration and plaque accumulation, which would
consequently lead to increased risk for caries and gingivitis. Read more...............
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