Re: Filling pain - how long to subside before doing root canal?Robert wrote:
> "Steven Bornfeld" wrote in message
> news:Fa-dnYz-68jrPKHVnZ2dnUVZ tHinZ2d@earthlink,com ...
>> Robert wrote:
>>> "Dartos" <tuthjockey@myturbonet,com > wrote in message
>>> news:1211909230 137272@news.newsville,com ...
>> The assessment of risk has changed over time. The consensus now is that
>> the greatest risk of sensitivity is due to incomplete coverage of the
>> dentin by bonding agent, incomplete evaporation of the solvent, or
>> inadequate bonding.
>> Of course, when I was in school there was more evidence than you can shake
>> a stick at that the treatment of dentin with phosphoric acid (the most
>> commonly used etchant) caused pulpal cell death and microabscesses. There
>> was copious microphotographic evidence of this. Somewhere between then
>> and now, somehow this was all refuted. The proof is (as
>
> Is the phosphoric acid used in the amalgam or composite fillings (or both)?
>
> Anyway, why the great stampede away from silver? Was it mainly for the
> cosmetics, or were there other reasons? (Forgetting about the mercury
> alarmists.) What about the claims of at least two dentists I know that
> silver fillings last longer and leak less?
>
>
>
>
>
Resin has used acid-etching as far back as the mid 1950s
(Buonocore)--a decade before the first commercially available composite
resin (I believe that was Adaptic, made by J&J). Bonding agents I think
came in maybe in the 1970s--back when the only photoactivated resin was
the Nuva system--and that used UV rather than visible light.
Parkell at one point claimed you can bond amalgam, but I don't think
I've ever heard anyone else make that claim. When I was in dental
school (1973-76) we did NOT bond our composites. Unbonded composites,
and esp. those self-cure resins generally available back then leaked
very badly--far worse than amalgam. However, I would guess that modern
composite resins properly bonded probably leak less than do amalgams for
the most part.
I don't have the confidence that Dartos does about very large resins,
because I have had some problems with them. That may well be me rather
than a failure of the material. There is no doubt that as a restorative
material, amalgam is closer to being idiot proof. What that means about
me I'll leave to others to speculate.
Steve