hi girls I don't think Q818 is about mandibular midline fracture, but it's about denture fracture.
Fractures in dentures result from two
different types of forces, namely, flexural
fatigue and impact. Flexural fatigue
occurs after repeated flexing of a material
and is a mode of fracture whereby
a structure eventually fails after being
repeatedly subjected to loads that are so
small that one application apparently does
nothing detrimental to the component.
This type of failure can be explained by
the development of microscopic cracks
in areas of stress concentration. With
continued loading, these cracks fuse to
an ever growing fissure that insidiously
weakens the material. Catastrophic failure
results from a final loading cycle that
exceeds the mechanical capacity of the
remaining sound portion of the material.3
often a result of flexural fatigue. Impact
failures usually occur out of the mouth as
a result of a sudden blow to the denture
or accidental dropping whilst cleaning,