Re: Gold or porcelain onlays

On Thu, 25 Aug 2005 20:42:12 GMT, Mark & Steven Bornfeld
<bornfeldmung@xxxxxxxxxxxxxxx> wrote:

>Dr. Steve wrote:
>
>> On Thu, 25 Aug 2005 19:20:13 GMT, W_B <no_one@xxxxxxxxxxx> wrote:
>>
>>
>>>On 25 Aug 2005 12:14:10 -0700, "Flap" <fullosseousflap@xxxxxxxxx> wrote:
>>>
>>>
>>>>Dr. Steve,
>>>>
>>>>How is a CEREC or a Cad-Cam milled all ceramic restoration kinder to
>>>>the tooth than gold?
>>>>
>>>>Flap
>>>>
>>>>http://flapsblog.com
>>>
>>>Non-glazed (but polished) porcelain is almost equal in wear characteristics to enamel.
>>
>>
>> Closer to enamel in wear characteristics and in thermal
>> expansion-contraction than gold.
>
>
> Really? I'm not doubting you, just that I'd always understood that no
>dental material was closer to tooth structure in wear and cfe than gold.
>
>Steve

That was true in the 1980's. It is no longer the case. If you glaze
the machine milled ceramic, then it gets almost as hard as laboratory
fired porcelain. But,,,,,,,,,,, polished, the ceramic has a surface
hardness between gold and tooth (closer to tooth than gold).
```````````````````````
Stephen (What's a temporary?)
~~~~~~~~~~~~~~~~~~~~~
.

Relevant Pages

  • Re: Gold or porcelain onlays
    ... Closer to enamel in wear characteristics and in thermal ... expansion-contraction than gold. ... dental material was closer to tooth structure in wear and cfe than gold. ...
    (sci.med.dentistry)
  • Re: Gourami Behaviour
    ... and had a closer look at them. ... fin shape, I think the blue is a male, and the gold a female. ...
    (rec.aquaria.freshwater.misc)
  • Re: Alchemists
    ... researching things like how to turn lead into gold, ... Althought the atomic numbers are close (in fact lead has just three more protons, 82, versus 79 for gold atoms), it turns out it's only just more than half the density of pure gold! ... Of course, pure gold would have been quite rare, so presumably the impure stuff was a little closer in weight. ...
    (rec.arts.sf.composition)
  • Re: Magnet and steel ball dent removal
    ... With gold currently at $600 and ounce, that's saying something. ... Closer to $700 now.....It will continue to go up until I buy some of it. ...
    (rec.music.makers.trumpet)
  • Re: Why Its Pointless To Argue With Global Warming Believers
    ... Gee, Steve, I am a teacher and you have claimed that since you *believe* I ... Only to an idiot would I need to prove that gold is one of the more ... enough to believe your claims about be a goldsmith when you offer no proof. ... OS X is not even partially based on FreeBSD" - Snit ...
    (comp.sys.mac.advocacy)
Quantcast