What Size O-ring Do I Need? By PREAT Corporation

What Size O-ring Do I Need? By PREAT Corporation


In this video we’re going to talk about
O-rings and dental implants and attachments and in particular different
earring sizes. Chris one of the challenges of dental implants and attachments is
figuring out what size are O-ring you need. Can you talk me through the process? Absolutely. A lot of the time you don’t even need to remove the o-ring from the
housing to determine what size you need. We have a couple really nice tools for
you. First you do need to get an accurate measurement. When we take a look at an
O-ring abutment there’s two measurements we take a look at. The first is the neck
of the ball or the undercut area where the O-ring sits. On this case for example
we’re measuring a 1.4. Okay. In general there’s about a point for to point
eight millimeter drop between the height of contour and the retention zone. So if
we measure a 1.4 retention zone our height of contour which is the diameter
of the ball most the time is in that one eight to two point two millimeter range.
This is what keeps the O-ring down as well. Exactly. This one is a two point one
five. So if you had measured a two point one five diameter ball and said I need
an O-ring for it I would do that math four point eight and know something in
that one point four range would be ideal. This is where a couple tools we have for
your gonna be really nice. In our product catalog on our app and also on the
website is an O-ring size chart. Has five different sizes of o-rings shows the
outer diameter and the internal diameter. You measured you take the diameter of
the retention zone match that with the internal diameter of the O-ring you’re
done searching. Now you know the sizes. Absolutely. Okay. Now I also understand
that getting a caliper like this into the mouth is not something that’s easy
to do. Doesn’t look mouth friendly. No. And a lot of times Boley gauges are used but
those are not as accurate as we want them to be. So one of the other options
is we have an O-ring combo pack. Five different sizes two ovaries of each size
and that are wasting your teres ID time or
your time in the laboratory trying to measure and guess you can use this just
to try them on try them on try a month until you find the size of the fits. And
it’s pretty easy to pop them on and off can you show us how that works? Sure.
So we have two different styles of housings we see. One is the open or
donut style housing. It’s much lower profile. Takes less space. You just pop it
on right then it’s that quick. Yeah. Yeah a lot of movement
the only negative to the donut style housing is that you need to block out
the head or the top of the post during processing. If you imagine this inside of
a denture and there’s acrylic on top the first time the patient functions or
bites down and there’s that movement because ovaries are the most resilient
attachments why they’re used on many implants they’re resilient they provide
a lot of movement they help protect your abutments. So the first time the patient
functions and had bit down on this that post is going to come through the O-ring
hit acrylic, so we need to have some free space in there to allow that post to
move through the o-ring without making contact with the acrylic and causing a
fracture. Alright. So the donut style well it takes less space you do need to block
out more. Okay. The second style and these are more popular and easier sometimes
are the the full domed housings as you can see they take up a lot more space
but for a chair side pickup you don’t need to do this block out. Right. So it
makes them a lot easier. Now going back to the donut style if you block out the
head with plaster the slurry makes a plaster you can just take your water
afterwards and cold rinse it right out of there
it’s a nice easy cleanup it’s a lot easier than soft wax but again we
probably see a lot of the a lot more of the closed off housings used.
All right cool. Is that everything we need to know about O-ring in particular
O-ring sizing? Take some time, take it through. If you’d
like more information please head on over to preat.com where you’ll find lots
of knowledge and information of course you’ll be able to order all of these
products. There are several hundred case presentations as well as the product
book. If you’d like to get in touch with us, particularly our technical team or
our customer service please call our 1-800 number or jump in email us use our
contact form all of that available on preat.com

Author: Kevin Mason

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