Re: extraction over root canal??

On Aug 17, 9:07 am, Steven Fawks <tuthjoc...@xxxxxxxxxxxxxx> wrote:
..

Certainly there are many complex issues at work regarding forces
placed on teeth. The basics involve the masseter and temporalis
muscles. They provide the main clenching force. They are very
strong muscles and they are capable of destroying 28-32 teeth when
they over work themselves.

These muscles do not apply less force in clenching just because
the patient loses some teeth!

However after thinking about it, it seems to me that the tmj joint
would
pick up extra torque, and up and down force with missing teeth, and I
do
remember reading somewhere that the tmj joint picks up most of the
extra
stress. For example if you lose all the teeth on the right side, that
would create
a reaction torque and force at the joint rather than transferring that
force to the
other teeth. Also if there was no reaction at the joint, maybe the jaw
muscles themselves would have to compensate for the torque imbalance,
and may in
practice not be able to apply as much up and down force.

There are sensing mechanisms and
feedback to the brain about the loads on teeth which should help
control the overall force of the muscles of mastication. It doesn't
take too long in the dental field to see that many people find
ways to defeat the system.

Fewer teeth mean a greater load placed on the remaining teeth.

I don't doubt there is an increase, but if you took into account the
reaction at the tmj joint, torque and y force, I suspect it would be
far less than you think. thats my complaint about the table analogy
because it gives the impression that if you lost 37 teeth, the
remaining tooth would have 37 times the force.
I agree that actually computing all these forces and muscle reactions
would be a difficult task, even with a computer.



.

Relevant Pages

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