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From: "Seay, E. A." <easeay@tva.gov>
To: "'Lancair Users Group'" <lancair.list@olsusa.com>
Subject: RE: Preparing for bonding
Date: Fri, 25 Jun 1999 11:49:59 -0400
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Hope your all's readers differentiate color scripts.

Mr. (Dr.?) Barrett wrote:

That's why many of the dental implants now are plasma coated with titanium -
this gives a surface similar to a micro etched surface (emphasis on micro
mine, oh yeah, plasma coating does not leave nice long grooves in the strata
like sand paper does.  You actually get millions of little tits standing up
all over the surface, which is better than sanding as far as surface area is
concerned ) .  The guys that know (I have always wanted to meet these guys,
as they are referred to a lot in my profession, engineering.) say this
provides a much greater surface area than any deep grooves or cuts. ( Now,
this is very true, we are now talking about two entirely different surface
prep processes here.)

Mr. Barrett's "micro etched surface" also illustrates what I meant about
MEAN surface gap, or as Mr Dahlgren correctly stated:
surface roughness is measured as "R" factor and there is an associated
surface area as a function of "R". the area goes up as the cut valleys get
deeper which happens as the grit particulates get larger.  

I would have to postulate that the adhesives used in dental practice also
depend on the surfaces, that are being glued together, to be in a close
proximity to each other, as cyanoacrylates adhesives do. 

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