Hello labman,
Thank you for your question! To research your problem I went to the
source,
Pentron Headquarters. I spoke with Grant Day, Director of Technical
Services in Laboratory Technologies at Pentron. He HAS heard of other
labs having this delamination problem, and says, “a lot of things can
cause that issue to occur.” It shouldn’t happen in the vast majority
of cases, however.
In order to do an accurate failure analysis, he’d like to talk with
you directly.
As a general rule, he said you need one millimeter of composite
material
to the margin area. Delamination can occur if there’s a knife-edge
margin
or if the resin’s too thick. It makes a difference if you’re talking
about a veneer, or a full crown: different restoration procedures
require different approaches.
In order to help you, he’d like to see your preparation design,
particularly
the actual pieces that failed.
You can reach him on the east coast at the Pentron headquarters in
Wallingford, CT. His phone number is 203-265-7397, ext.
256. (He said to remember he’s on Eastern Time.)
He also referred me to the website of the National Association of
Dental Laboratories. The website for the NADL is:
http://www.nadl.org/
There I found the listing for the Journal of Dental Technology, and
e-mailed them to see if they’d written anything on this subject at:
www.jdt@nadl.org
I’ll let you know if they respond in the affirmative.
If you’d like to contact Jeneric/Pentron headquarters by mail, the
address and web address are:
Jeneric/Pentron Inc.
53 North Plains Industrial Rd, Wallingford, CT 06492
Website: www.jenericpentron.com
There is also an article on the Dental News.com website titled
“Direct and Indirect Esthetic Adhesive Restorative Material Review.”
It gives a general review of a number of materials. It doesn’t
specifically mention Sculpture, but may refer to the type of composite
generically. That article can be found at :
http://www.dentalnews.com/insidearticl14.htm
I hope this answer meets your needs. If this is not what you were
looking
for, and you would like me to research further, or add or clarify
something,
please do not hesitate to contact me through the "clarify answer"
button
before you rate the answer.
Good luck in solving your delamination problem!!
Sincerely, cath-ga
search strategy on Google:
Jeneric/Pentron
Jeneric/Pentron + deteriorate
dental composite + delamination
dental composite + debonding |
Clarification of Answer by
cath-ga
on
04 Jun 2003 10:23 PDT
Hi Labman,
I've gotten a couple more responses to your question. Ricki Braswell,
Deputy Executive Director of the National Association of Dental Labs,
says she's never heard of this problem, and usually would recommend
you go directly to the manufacturer. She will look into it.
Arun Prasad, Ph.D,Sr. VP, Technology at Pentron also returned
my e-mail because Grant Day was out of the office at the time.
He says that Sculpture isn't associated with delamination problems,
and he himself has had a Sculpture bridge for five years.
He's going to phone me today, but hopefully you will have talked
with Grant Day by then...Please let me know if you have. They
both say it is the preparation technique that would be the cause
and they'd be happy to work with you on that. Sincerely, cath-ga
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