DYNAMIC OCCLUSION - Working vs. Non-working Movement & Occlusal Grid
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- Опубликовано: 13 июл 2024
- In this video, we tackle the challenging concept of working and non-working movement and how to more easily determine where cusps will travel during these excursive movements.
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thanks so much for redoing this topic from the pass the dental boards. its so much more clear!!
i was really really looking for something like this, i had too many doubts regarding occlusion especially working and non working sides' related points, THANK YOU so much for making this video and uploading it. keep it up like this. great job!
So glad to hear! Thank you!
Short cut Alert is simply awesome! Thanks!
Man I can't thank you enough for making this video, this is great, I really appreciate it!
You're so welcome! Glad you enjoyed the video.
I got it finally !!!! Thank you for such a detail explanation!!!
and again you are amazing how CAN I THANK U ENOUGH !!!!
Perfectly explained; I couldn't get this concept from so long. God bless you
You deserve 10 thumbs up!!!!!
Thank you, it is super helpful.
Amazing. Thank you!
Awesome. Very informative.
Extremely well-presented and informative. Thank you for this!
You're very welcome!
Thank you very much.god bless you
Crazy awesome! You cleared up something as a foreign dentist I was never taught. Thank you so much.
Thank you very much.. you explained it in a much simpler and clarified way than pass the national boards.. thanks a ton !!
You're very welcome! Glad it was helpful.
It was very informative.. thank u so much
Hey Ryan! Thanks again for everything you do, it’s a huge help for so many!
I have a question for you. Do these rules apply to people with a posterior cross bite?!
Thank you in advance!
thank you so much!
awesome, thanks!
Thank you.
Great video
Thank you
Dynamic Occlusion is a very different thing from Dynamic Occlusion Culling.
You learn something new every day.
thank you soooo much ,, you save my life 😭 thank you thank you 💙💙
You're very welcome!!
very useful. Tnx
12:12 Great!
Could we please have some video explaining the graphical questions asked on occlusion in national dental board exam..a set of 10-15 variations.. thanks
Holy crap. "Adapted from" = far exceptional as compared to.
Great!
i came back to thank you again, you helped me so much in understanding occlusion, you are amazingg, thank you!!!!!!!!!!!!!!!!!!!!!!
You are very welcome! Thank you for the kind words :)
youre welcomee!
I love to restore with amalgum...and I love to know pre existing contacts...and working planes....
....so that....I actually never get high occlusal contacts...I know everything ...and this stuff is really important....
....I saw most of the people dont know how to use the articulation paper...
Excellent your Videos, Thanks. Check about minute 10:30 to 10:40, correct side wrong teeth numbers for both molar. You said left side and teeth number 14 and 19.
Thank you for watching! Patient's left side would be #14 and 19 for the first molars.
Hello! I have a question where the numbers are derived from on the grid. Do i just memorize it?
Hi Ryan! Just had a question. If we use the occlusal grid to solve questions for the left side of the mouth, do we have to flip everything to the other side? I was trying to solve it for which structure the buccal cusp of #20 passes for a left lateral working movement, and following the grid, i answered lingual embrasure between #12 & 13. The correct answer was buccal embrasure between #12&13. So I began to wonder, do we really need to flip the grid and arrows the other way to solve for left dentition?? Please help. Quite confused.
Hi Anna! Great question. There are really two ways to apply the grid for the left side of the mouth which I should have clarified in my video but I ran out of time! So probably the safest way (but also the longer way) would be to redraw the grid for the left side and then like you said basically flip everything over. Everything, including the movement arrows, would be an exact mirror image of the right side. The second way to do it would be to simply apply the mirror image principle to the wording of your question. In other words, since you were solving a question that talked about a left tooth and left working movement, you could instead just solve it for the matching tooth on the right side (#29) with right working movement and the answer would come out exactly the same! Hope that helps!
I see a professor here ... Are you planning teaching in a particular college?? Tufts University, UPEN? Thanks for sharing this..
Great video! is laterotrusive movement same as lateral excursion?
Yes!
Hey Ryan, i think the tooth in picture is 'right' upper 1st molar. Correct me if I am wrong
Does your shortcut only work for Columbia dentoform models or PKT also?
dr ryan can you make this into a playlist
Right lateral excursion ,mb cusp of max 1molar pass thru what of mand 1 molar
A buccal groove
Bcentral groove
C mesiobuccal groove
d distobuccal groove
E lingual groove
A
There is distobuccal groove but no mesiobuccal groove. Buccal groove is the correct nomenclature for the more mesial groove on the buccal surface of the mandibular 1st molar. Thus, correct answer is A.
@bansaridobaria After further research, I must rectify what I wrote above. Apparently, as you can see for yourself here on this link (downloads.lww.com/wolterskluwer_vitalstream_com/sample-content/9781608317462_Scheid/samples/Chapter05.pdf), you can go both ways, i.e. either calling that groove mesiobuccal groove or simply buccal groove. However, if both terms are present in the question, and to be on the safe side, I would choose "mesiobuccal groove", that is, option C. Cheers!
instead of using purple and light purple lines, I would have used red and green lines indicating which surfaces should be adjusted out.
looking at the occlusal grid, does there need to be a contact on all teeth 1-13? what if there is misalignment in some of the teeth or there are missing teeth making all these contact points impossible?
Yes, this occlusal grid is specific to an ideal occlusion, with no malalignment, no missing teeth, etc. The board exam (and most dental school exams I’d imagine) will ask these sorts of questions with an ideal occlusion only.
You are amazing! Thank you. Taking boards in 4 day! Yikes
Thank you, and best of luck to you!
hey guys, maybe someone on here can help me out. I'm really lost when it comes to orienting the tooth in the first practice problem. if buccal is "up" and palatal is "down" on the image and mesial is left and distal is right and we're looking directly at the occlusion, wouldnt that be maxillary right (#3)? I understand everything else like the contact points and the movements, but I'm hung up on how this is the upper left.
Hey Ryan! Thanks so much! I’m confused about something, can we use this rule for patients with posterior cross bite where cusps don’t line up in the same manner? Thank you!
Which rule in particular are you referring to?
Mental Dental referring to occlusal grid. When we have a patient with posterior cross-bite, class ll, or lll malocclusion, how can we employ this rule (or even picket fence)?
When you say that the mandible is moving to the left, is that the patient's left (such as during periocharting)?
Can you give me a time stamp for when I say this? Usually when I say the mandible is moving a certain direction, I am referring to the patient. So mandible moving left means to the patient’s left.
@@mentaldental thanks for this video(and all videos)! throughout the video you say the left side but I am accustomed to looking at it and imagining I am looking directly at a patient meaning, for example in minute 14:27 on the cross sectional diagram the buccal is on the right side meaning it is the patients left side and not right side. Am I missing something? thank you again for ALL OF THE AMAZING VIDEOS!!!!
Thank you!
For the NW movement on the Occlusal grid (15:30), the arrow moves in an oblique manner to end over the lingual cusp of the Max 1st premolar. now i understand why this is the distal surface of the lingual cusp, i cannot seem to understand how this would be buccal, as it passes entirely from the central groove to the lingual surface, passing through the distolingual triangular groove, and made no contact with the buccal surfaces. How can a lingual cusp have a buccal surface?
Am i understanding things wrong? 😭😅😅
Thank you!!
Every cusp has a buccal-facing incline somewhere on it! Think of a mountain or a rectangular prism. It will have inclines facing each cardinal direction (buccal, lingual, mesial, and distal).
@@mentaldental Makes so much sense! thank you so much Dr.!
Can you use the shortcut for lateral excursions?
Yes, you could apply it for excursive movement.
how do you answer questions with teeth on the left side?
Hi Lauren! Great question. There are really two ways to apply the grid for the left side of the mouth which I should have clarified in my video but I ran out of time! So probably the safest way (but also the longer way) would be to redraw the grid for the left side and then basically flip everything over. Everything, including the movement arrows, would be an exact mirror image of the right side. The second way to do it would be to simply apply the mirror image principle to the wording of your question. In other words, if you were solving a question that talked about a left tooth and left working movement, you could instead just solve it for the matching tooth on the right side with right working movement and the answer would come out exactly the same! Hope that helps!
such a nice video... but the volume was really low
Sorry about the audio quality! I made this video before I had a professional microphone, so it has definitely improved since then.
you should've explained what the numbers denoted in the occlusal grid. there is confusion whether the number is a cusp, a groove, fossa,etc...... otherwise good job.
How do we know it’s the left side in picture ? Seems like right to me. Please help😢
Depending on which part of the video you’re referring to, left side of the image may be right side for the patient.
What happens if they ask about a left tooth? Your grid only shows for the right side. Also why is working going toward lingual on the grid. It doesn’t make sense
Thanks for the questions! If they ask about a left tooth, you have some options. You can either redraw the grid for the left side (takes a while) OR you can just swap all the rights and lefts in the question (right becomes left and left becomes right) because of the symmetry of the mouth! You are right that it seems counterintuitive that working is going toward the lingual but that is only for the mandibular teeth. For the maxillary, working goes out toward the cheek which makes sense as we talked about earlier in the video. Notice how all the arrows for working, nonworking, and protrusive for the mandible are exactly opposite to those in the maxilla. That is because for every movement that the mandible is doing, the maxilla is staying still. So that is the tricky part--all movements of the mandible are traced onto the maxilla and all movements opposite to this are traced onto the mandible, since the maxilla is just staying still during all of it.
So would the arrows for NW, W, and Protrusion stay the same if we are looking at a tooth on the left side?
at 15:32 when you move from point 3 --> 4 for the NW movement why does it hit the DB surface of max 1st PM? it looks like its the lingual/mesial to me
Great question. Imagine drawing the arrow starting from its origin at the circle around 4 and drawing it toward the 3. The arrow would first contact the lower right corner of the 3, which refers to the distal (D) and buccal (B) surfaces in this drawing. The first surfaces that the mand 2nd PM cusp would contact on the max 1st PM are therefore the DB.
@@mentaldental If the mandible is moving to the left, then the right mandibular 2nd premolar would be moving towards the lingual in non working movement and the buccal cusp of mandibular 2nd PM would have to be moving towards the distolingual cusp of maxillary 1st premolar in Nonworking movement. ???
Exactly, it is clearly a mistake. During mediotrusive movement 2 mandibular premolar's buccal cusp hits lingual cusp of maxillary 1 premolar.
Also at 19:00 non-working movement means, that the mandible is moving to the left and MB cusp of the right maxillary first molar won't touch anything on the bottom
vasja pupkin Ryan is right. He meant to say Disto buccal surface of lingual cusp of Mandibular First Premolar. Makes sense? He never said Distobuccal cusp. First of all PM1 has no DB cusp. So he said and meant the surface. Lingual cusp is understood without him mentioning cuz we’re only talking about lingual cusps/functioning cusp in the upper arch.
Was on the search for dynamic occlusion in the computer graphics context. Was disappointed
Plz ans this qustn@dental mental
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