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surpass techniques
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john kanca



Joined: 14 May 2005
Posts: 6346

PostPosted: Tue Sep 18, 2007 8:04 am    Post subject: Reply with quote

Still new with the surpass...Is it OK to really thin out the sur 3, when sealing after crown preps, or before cementation of crowns? because it seems a little thick. and if the answer is yes, does that affect the bond strength.

There is considerable lattitude. Thin it out as you need.

can you do that as well with direct restorations or is it better to leave a little thickness (of course with no pooling)

Same thing- thin it out as you need or desire.

I recall years ago it was suggested to keep a thicker layer of adhesive on class V's to allow for a little more flexure to the restoration and avoiding "pop offs" Is that same theory valid now, again I am going back to the thickness of the sur 3...do we leave it thick or really thin it out?

No, the flexure thing is out and has been for some time.
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Pcus



Joined: 17 May 2005
Posts: 434
Location: toronto

PostPosted: Tue Sep 18, 2007 11:56 am    Post subject: Reply with quote

Yea...I have been out of it for some time as well

Gerry

I just got a light meter from Ultra Lume

It has two gauges one for camphorquinone and one for proprietary initiators, there are red and green gauges beside each category, green is good red is bad

I have been taught by John over the past 15 years or so converse in power or energy supplied to a tooth rather than time.

I still do not know how much mw/cm2 energy this puts out. I am waiting for a conventional meter, so for now I am going by John's recommendation on curing times.
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Gerry



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

PostPosted: Tue Sep 18, 2007 2:31 pm    Post subject: Reply with quote

Arguably John knows more about polymerization than anybody. So whatever he has recommended is right! As for power density I have found that the HILUX radiometer from First Medica is as acurate with all light sources - LED, QTH - as any in the market. The ones that come stuck on the side of the light units is very questionable and gives no hard numbers.
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d2thdr



Joined: 16 Oct 2005
Posts: 402
Location: Cincinnati, Ohio

PostPosted: Fri Sep 21, 2007 6:37 pm    Post subject: Reply with quote

Maybe this is on here somewhere else, but thought I'd ask it here.

Is there a difference in bond strengths to enamel (or dentin) cut with a diamond versus a carbide?

What about specifically in the area of the bevels?
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john kanca



Joined: 14 May 2005
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PostPosted: Mon Sep 24, 2007 6:16 pm    Post subject: Reply with quote

d2thdr wrote:
Maybe this is on here somewhere else, but thought I'd ask it here.

Is there a difference in bond strengths to enamel (or dentin) cut with a diamond versus a carbide?

What about specifically in the area of the bevels?


I am not certain whether this has been specifically examined, but there have been studies looking at the effects of different roughnesses on bond strengths, but they were done long ago.
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d2thdr



Joined: 16 Oct 2005
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PostPosted: Mon Sep 24, 2007 6:29 pm    Post subject: Reply with quote

Sooooooo.....

Currently you'd say.....it doesn't make a difference? Cool
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john kanca



Joined: 14 May 2005
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PostPosted: Mon Sep 24, 2007 9:06 pm    Post subject: Reply with quote

I cannot say that I know that it matters one way or the other. Different diamond grits might also matter.
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Gerry



Joined: 13 May 2005
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Location: Tarrytown NY

PostPosted: Tue Sep 25, 2007 10:11 am    Post subject: Reply with quote

John:

You mention that the grit of the diamond used to prepare dentin and/or enamel, hence roughness, might make a difference in SBS. Wouldn't that relate to the studies using particle abrasion with Al2O3 particles of varying sizes?
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john kanca



Joined: 14 May 2005
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PostPosted: Tue Sep 25, 2007 11:01 am    Post subject: Reply with quote

Not at all.
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Gerry



Joined: 13 May 2005
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PostPosted: Tue Sep 25, 2007 12:15 pm    Post subject: Reply with quote

WYE KNOT?
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john kanca



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PostPosted: Tue Sep 25, 2007 2:48 pm    Post subject: Reply with quote

Unsupported assumption of relativity.

The correlation would have be established first.
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Gerry



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PostPosted: Tue Sep 25, 2007 3:36 pm    Post subject: Reply with quote

The stuff we've done in previously years showed an increase with PA and larger particles. The most recent studies failed to indicate any improvement at all. All seems kinda questionable to me.
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