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Gerry



Joined: 13 May 2005
Posts: 448
Location: Tarrytown NY

PostPosted: Tue Aug 23, 2005 9:44 am    Post subject: Reply with quote

It depends on how it is measured, and it is difficult to measure. The enamel tends to fracture before one can really get a number. It is really high.

SO - why do some guru's claim that D-E bond is around 23mPa? Other than they can't get higher bond strengths with their stuff! Or did I just answer my own question.
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john kanca



Joined: 14 May 2005
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PostPosted: Tue Aug 23, 2005 10:06 am    Post subject: Reply with quote

It is a heck of a lot more than 23 mPa.
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Gerry



Joined: 13 May 2005
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Location: Tarrytown NY

PostPosted: Tue Aug 23, 2005 10:28 am    Post subject: Reply with quote

It is a heck of a lot more than 23 mPa.

That's fairly obvious to anyone who has done any testing whatsoever. So where did this number start from? See DT for various "experts" pushing this number. "I'm happy with anything around 20 as this is the D-E fusion strength. Anything more is window dressing"
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john kanca



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PostPosted: Tue Aug 23, 2005 10:54 am    Post subject: Reply with quote

Got a link for said claims?
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Gerry



Joined: 13 May 2005
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PostPosted: Tue Aug 23, 2005 11:32 am    Post subject: Reply with quote

I did once - Haven't bothered with DT for several months. This is from a thread (one of many) you were invovled with where you basically stated that the more the better. I'll look this stuff up when I get a break. Lunch is occupied with setting up 20 specimens.
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Gerry



Joined: 13 May 2005
Posts: 448
Location: Tarrytown NY

PostPosted: Tue Aug 23, 2005 11:36 am    Post subject: Reply with quote

The mean ultimate tensile cohesive strengths of bovine and human DEJ region were 47.7 MPa and 51.5 MPa (Urabe & Nakajima)

I'll keep looking on DT for the 20(+/-) statement.
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john kanca



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PostPosted: Tue Aug 23, 2005 12:31 pm    Post subject: Reply with quote

This strikes me as low...John Gwinnett figured it much higher....
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