hey it's dr amanda with street smile solutions street smile solutions.com and today we're going
to talk about molar and canine classification and if you're a dentist you definitely know what this
is but i'm going to make this video more towards consumers so they can understand what a class 1
class 2 or class 3 molar or canine relationship is so let's start with class 1 because that's
the easiest to understand in an adult so in kids it looks a little bit differently but
this one's not even full class one yeah it probably is okay so yeah when i close it down
it is so teeth should fit together like clogs on a wheel so you know what that is cogs on a wheel
that's like when you have like cogs you know and they all fit in like this so that's how the teeth
should fit together okay so the upper tooth should fit in between these lower teeth and
this one fits in between these and this one fits in between these can you get it so the cusp the
most mesial class that means the most forward cusp in the mouth this cusp on your upper six-year-old
molar this tooth should fit in the mesial buccal groove of the lower molar okay so there's a little
groove on that tooth i know it's hard to see because there's a band on it but you can sit see
how these teeth are fitting together now that's class one okay that's how teeth are supposed to
be when you're class one if everything works out perfectly you should just have perfect overjet
perfect all that should be just about perfect okay teeth are not meant to go together like
oops i don't know if i can do it with this nope i can do it with this one teeth are okay hang on
okay teeth are not meant together to hit like this okay on top of one another it's meant to be like
this so that the backs of the upper teeth almost touch of the lower teeth almost touch the backs
of the upper teeth but not completely they should just be yes like this okay can you
see that that's how teeth are meant to be this is perfect bite okay this is also a
perfect bite okay mid lines are on front teeth are right behind the upper teeth i usually don't
like them to touch i like to be like right behind but not touching but i do want everything on the
side to be touching okay that's class one okay now let's do comparison sake let's talk about
class two which is probably the most common malocclusion especially in caucasians
okay so when you have class two remember the comparison where ah there we go this is
exactly how it is remember the comparison where this tooth fit in between these two
teeth and this tooth between these two teeth and this cusp fit in right there
in the middle well now everything slid forward on top right and as a result we have overdrive
you don't see super a lot of overjet because these front teeth are retroclined or dumped
back but if we straighten these the overjet would get a lot more severe okay so this is
a class two byte there are two different classifications of class two bytes one is
class two division two that's what this is that's where it's a little bit camouflaged because these
everything's kind of dumped back the other one is class two division one where you get buck teeth
you tend to see that more in thumb suckers and things like that okay but those regardless are
class two the clause of class two can be one of two different things but most commonly it's caused
by a small lower jaw okay sometimes it's caused by a more protrusive or forward upper jaw but that's
much more rare usually it's a small lower jaw the good news about this fight is that it can be fully
corrected as long as you're starting why the child is still growing okay so that's class two
so when we talk about bites not fitting together right or a canine or a molar being class
two this is class two okay so the opposite would be class three and that's where you start to have
a little bit of an i underbite have a good type but not four because it's a little bit more rare
okay but class three would be like this this this okay where the lower teeth are more forward that
can be that's most common in kids caused by a small upper jaw and an adult caused by a big
lower jaw or a combination of both but anyways you get the idea so now you understand class one class
two division um class two division one class two division two and class 3. all right thanks so much