Occlusion Part 2

00:08:58
https://www.youtube.com/watch?v=0G6xEWOUs1E

摘要

TLDRRyan explains the dynamics of mandibular movements, focusing primarily on occlusion and related concepts. He discusses how the mandible moves from the frontal plane, elaborating on points like maximum intercuspation and physiological rest. The video emphasizes the importance of canine guidance, where maxillary and mandibular canines prevent the posterior teeth from contacting during lateral movements. Ryan uses visual aids, such as the pults diagram, to illustrate mandibular range of motion. He also introduces terms like Bennett movement and Bennett angle, explaining their relevance to mandibular lateral motion, and the working versus non-working sides of the jaw. Moreover, Ryan touches on occlusion issues such as overjet and overbite, explaining their potential complications and the need for orthodontic intervention when occlusion is compromised. This video builds on the foundational concepts from his first video on occlusion.

心得

  • 🦷 Maximum intercuspation is a key point where teeth touch tightly.
  • 📈 Physiological rest position indicates a slightly open mandible state.
  • 🔄 Canine guidance prevents posterior teeth contact during lateral moves.
  • 🎥 Visual aids like the pults diagram show mandibular movement range.
  • ↔️ Bennett movement describes lateral condyle motion.
  • 📐 Bennett angle arises from mandibular lateral motion.
  • 🔄 Working and non-working sides affect how jaw moves.
  • ⚠️ Overjet and overbite issues can lead to periodontal problems.
  • 🦷 Occlusion issues require orthodontic solutions.
  • 📚 Understanding occlusion is crucial for dental health.

时间轴

  • 00:00:00 - 00:08:58

    In this part two video on occlusion, Ryan delves into the frontal motion of the mandible, focusing on maximum intercuspation, where all teeth are tightly touching. He explains key points: the G point for maximum intercuspation, R point for physiological rest position, and E for maximum opening. The video emphasizes understanding mandible movement from different planes and describes how canine guidance ensures posterior teeth don't touch during lateral motion, explaining the role of maxillary and mandibular canines. Ryan suggests observing canine guidance through videos or models to better grasp its concept.

思维导图

Mind Map

常见问题

  • What does the 'G point' represent?

    The 'G point' represents maximum intercuspation, where all teeth are touching as tightly as possible.

  • What is physiological rest position?

    It's the position where the mandible is slightly open from maximum intercuspation.

  • What is the role of canine guidance?

    Canine guidance ensures that posterior teeth do not touch when the mandible slides to the side.

  • How is the Bennett movement described?

    Bennett movement refers to the lateral movement of the condyle during jaw motion.

  • What is a Bennett angle?

    The angle formed between the line of mandibular movement and the sagittal line during lateral movements.

  • What are overjet and overbite?

    Overjet refers to horizontal overlap of teeth, while overbite refers to vertical overlap.

  • What can happen if occlusion is incorrect?

    Incorrect occlusion can lead to issues like impinging overbite, potentially causing periodontal disease and gingivitis.

  • Why is canine guidance important in mandibular motion?

    It protects posterior teeth from contact during lateral movements and ensures smooth motion of the mandible.

查看更多视频摘要

即时访问由人工智能支持的免费 YouTube 视频摘要！
字幕
en
自动滚动:
  • 00:00:00
    hey everyone this is Ryan and this is a
  • 00:00:03
    part two video for occlusion uh make
  • 00:00:06
    sure if you haven't already seen my part
  • 00:00:08
    one on occlusion to get some some basic
  • 00:00:13
    ideas of why the mandible moves how it
  • 00:00:17
    moves and the range of motion as
  • 00:00:21
    represented by this lateral diagram uh
  • 00:00:23
    called the pult
  • 00:00:27
    diagram all right so so I already talked
  • 00:00:30
    about the lateral motion of the manable
  • 00:00:33
    let's talk a little bit about the
  • 00:00:34
    frontal motion or I should say the
  • 00:00:37
    motion of the mandible from a frontal
  • 00:00:41
    plane so this G point was maximum
  • 00:00:47
    intercuspation likewise this G point is
  • 00:00:50
    is representing maximum
  • 00:00:53
    intercuspation or the position at which
  • 00:00:57
    all of the teeth are touching are
  • 00:01:00
    including as tightly as possible and
  • 00:01:03
    this R here correlates with this R here
  • 00:01:06
    and that's physiological rest position
  • 00:01:08
    where the mandible is slightly open from
  • 00:01:11
    Mi or maximum
  • 00:01:14
    intercuspation this point down here
  • 00:01:16
    would represent e which is maximum
  • 00:01:19
    opening and you can't really see here
  • 00:01:23
    but you can imagine a line through here
  • 00:01:26
    and here would represent the
  • 00:01:30
    extended extended opening and Centric
  • 00:01:34
    relation and this protruded movement all
  • 00:01:38
    these these these planes here sort of
  • 00:01:41
    Squish back into one line so so you
  • 00:01:44
    can't really appreciate them from the
  • 00:01:46
    frontal view but what you can appreciate
  • 00:01:49
    is the lateral motion of the
  • 00:01:51
    mandible as you uh move it side to
  • 00:01:56
    side
  • 00:01:57
    so maybe you're wondering why why
  • 00:01:59
    doesn't it just go straight
  • 00:02:01
    across well this these divots here are a
  • 00:02:05
    result of what's called anterior or or
  • 00:02:09
    canine
  • 00:02:10
    guidance and canine guidance is
  • 00:02:14
    essentially when canines the the
  • 00:02:16
    maxillary canines and mandibular canines
  • 00:02:19
    together because they're the longest
  • 00:02:22
    teeth ensure that the posterior teeth do
  • 00:02:25
    not touch when the mandible is sliding
  • 00:02:30
    to the
  • 00:02:31
    side so the best way to really see this
  • 00:02:35
    uh for yourself and and I think the best
  • 00:02:36
    way to understand it is either to to
  • 00:02:38
    watch a a video of canine guidance or to
  • 00:02:41
    have in your hand that that seethrough
  • 00:02:45
    denor and slide
  • 00:02:48
    it from Slide the the maxillary or or
  • 00:02:52
    the mandibular Arch to the side and
  • 00:02:54
    you'll notice that as you slide the
  • 00:02:56
    canines are the first teeth to touch
  • 00:03:00
    and those posterior teeth won't touch at
  • 00:03:04
    all until the canines are tip to tip and
  • 00:03:08
    then after that point you lose canine
  • 00:03:11
    guidance so remember the pults diagram
  • 00:03:14
    is representing the mandip range of
  • 00:03:16
    motion so this Mand mandible you can
  • 00:03:19
    think of it as it's as it's going over
  • 00:03:22
    this cusp tip of the canine it's going
  • 00:03:25
    down and then right here is where it's
  • 00:03:28
    going to reach the tip and then this
  • 00:03:31
    rest of the way you you lose Canon
  • 00:03:34
    guidance so it's the same on this side
  • 00:03:36
    hopefully that makes
  • 00:03:38
    sense and so these two points here would
  • 00:03:41
    would represent the maximum right
  • 00:03:45
    lateral and the maximum left
  • 00:03:51
    lateral okay great so while we're
  • 00:03:53
    talking about lateral movement of the
  • 00:03:54
    jaw let's just hop down to this diagram
  • 00:03:57
    here let me change my color getting sick
  • 00:04:00
    of that
  • 00:04:02
    blue so when we talk about the lateral
  • 00:04:07
    movement of the mandible there's sort of
  • 00:04:08
    two sides we talk about the working
  • 00:04:11
    side which I I should say this would be
  • 00:04:15
    consider the working side because you're
  • 00:04:17
    the mandible moves in the direction of
  • 00:04:21
    the working side so here's where the
  • 00:04:23
    mandible was and here is where it moved
  • 00:04:27
    to and this would be the non-working or
  • 00:04:31
    balancing side of the
  • 00:04:33
    mandible and then of course if we move
  • 00:04:36
    the mandible to the left the rules would
  • 00:04:38
    be switched this would be the working
  • 00:04:40
    side and this would be the non-working
  • 00:04:42
    side for all intents and purposes this
  • 00:04:45
    diagram shows that the manable is going
  • 00:04:47
    to the right so the right side is going
  • 00:04:48
    to be the working side and this if if we
  • 00:04:51
    track one point in the in the cond head
  • 00:04:56
    you see that this W1 was the middle of
  • 00:05:00
    the cond head before motion and this is
  • 00:05:04
    where it ended up after motion so that's
  • 00:05:07
    called
  • 00:05:09
    um the Bennett
  • 00:05:12
    movement and now more important for
  • 00:05:15
    clinicians is is is H the more important
  • 00:05:18
    concept for clinicians is happening on
  • 00:05:20
    the the non-working side and that
  • 00:05:24
    involves what's called benit angle and
  • 00:05:27
    so this time we we do the same thing we
  • 00:05:30
    take one point in the m in the
  • 00:05:33
    mandibular condo or the condar head and
  • 00:05:36
    then we see where it ended up after
  • 00:05:39
    motion now you'll notice that the
  • 00:05:43
    working side stayed in its
  • 00:05:46
    faasa the non-working
  • 00:05:48
    side ironically did more work and came
  • 00:05:53
    up and down ran
  • 00:05:56
    down this articular eminence
  • 00:06:00
    as the jaw uh came out this in this
  • 00:06:05
    direction so this these two points here
  • 00:06:09
    we can draw a line through them which
  • 00:06:12
    represents this line of the angle and
  • 00:06:14
    then this line is is
  • 00:06:16
    simply um A A A sagittal line a median
  • 00:06:22
    line going um perpendicular to the
  • 00:06:25
    coronal plane of the of the body however
  • 00:06:27
    you want to think about it and this
  • 00:06:30
    angle between the median line and the
  • 00:06:34
    the line between points of man of the
  • 00:06:36
    mandible before and after movement forms
  • 00:06:40
    the benit
  • 00:06:43
    angle all right and just to briefly
  • 00:06:46
    touch on this concept um here we
  • 00:06:50
    have overjet and
  • 00:06:53
    overbite so remember that ol clusion has
  • 00:06:57
    sort of two goals one is that the teeth
  • 00:07:00
    need to need to interdigitate properly
  • 00:07:04
    and two they need to uh occlusion needs
  • 00:07:07
    to allow for the free motion of
  • 00:07:09
    teeth so there can't be obstacles or
  • 00:07:12
    teeth can't be bumping into one another
  • 00:07:14
    before all the rest
  • 00:07:15
    do and you want to obtain maximum
  • 00:07:20
    intercuspation so here we
  • 00:07:23
    have
  • 00:07:25
    um not great
  • 00:07:28
    occlusion and
  • 00:07:30
    what happens is instead of this uh
  • 00:07:33
    incisal edge of the mandibular
  • 00:07:35
    inzer
  • 00:07:37
    contacting its an
  • 00:07:40
    antagonist um more more in sizely it
  • 00:07:44
    it's contacting it more uh
  • 00:07:48
    cervically and this results in two
  • 00:07:51
    things one is this this concept of
  • 00:07:54
    overjet which which refers to horizontal
  • 00:07:58
    overlap
  • 00:07:59
    and if the overjets really
  • 00:08:02
    bad you'll also see paired with it um
  • 00:08:06
    vertical overlap which is where the the
  • 00:08:09
    bottom teeth are are coming too far up
  • 00:08:13
    and overbite could um could result in
  • 00:08:18
    impinging overbite where if this tooth
  • 00:08:21
    were slid back a little bit it would be
  • 00:08:22
    touching it wouldn't even be touching
  • 00:08:24
    this tooth it would be touching the gums
  • 00:08:26
    which has terrible consequences for
  • 00:08:28
    things like onal disease and
  • 00:08:31
    gingivitis so these are some of the
  • 00:08:35
    things that can happen when occlusion is
  • 00:08:38
    not correct and you would need to
  • 00:08:41
    undergo uh most likely orthodontic
  • 00:08:44
    treatment to get your bite
  • 00:08:48
    fixed so I hope this video is helpful
  • 00:08:51
    and I'll see you next
  • 00:08:54
    time thanks for
  • 00:08:56
    watching
标签
  • mandibular movement
  • occlusion
  • canine guidance
  • frontal plane
  • Bennett movement
  • Bennett angle
  • overjet
  • overbite
  • maximum intercuspation
  • physiological rest