U did a greatttttt job. Especially with making mistakes like any normal person should do, and accepting them and rectifying them. Bcoz most utubers just show that they make perfect preparations in one go. And that kind of makes me feel bad about myself. Amazing work here.
Thank you for the informative video Doctor. Can you please explain the concept of external and internal 90 degree exit angles a little more in detail in this comment or a different video. Thank you in advance.
the internal angle between the axial wall and the proximal walls should approach 90 degrees, and the angle from the proximal walls and the outer surface of the tooth (the cavosurface angle) should also be 90 degrees.
Doctor Stevenson, thank you for sharing the videos. Also, I have a question for you: do you sale the hand instruments in a kit or individual each one. Thank you very much.
Thanks for the video! Question… for class II preps involving the oblique ridge do you have to complete the prep by doing the other little piece on the other side of the oblique ridge? I have seen cases where a class II prep on tooth #3 or #14 that involve two separate parts, one on either side of the oblique ridge. Thank you!
If the school asks for a separate prep, they will typically specify this: MO + O or MO + OL. If they specify MOL, then you cross the oblique ridge. In clinical practice we always try to preserve the Oblique Ridge...Best, Dr. S
Thank you so much Dr Stevenson for the ultimately useful cavity prep tutorial I really enjoyed watching and it made me feel confident before the exam the most importantly
I like how you are soooo good at it doc and still making us comfortable by acknowledging mistakes (which are not even mistakes lol). Thank you so much for this highly informative video, it was of great help ❤️❤️
Excellent video and m a super fan of your video!!! When I work on the box on the facial side with the hatcher on the manikin, it is extremely hard to chip (pt turn away from me). Can you advise?
You may try an Off-angle Chisel, the 45S for the mesial box and the 44s for the distal - other than that, it can be done with a reverse approach and a palm-thumb grasp - tricky but doable!
Liked and subscribed,watching this at 3 30am. Im currently a second grade dental student in Turkey and really flunked hard on a MOD amalgam preparation on number 15 and 16, and i had to buy another phantom jaw. Watching your other video really did help and I instantly noticed tbe difference following up on some of your methods! What is the likelyhood for a person such as I to work in the U.S or Canada after I graduate? Thanks a lot Doc :)
Stevenson Dental Solutions yeah, thank you so much for this video, doctor. It was really helpful. I think the enamel hatchet is my favourite instrument now hahaha
Well, I'd suggest that a good read of the peer reviewed literature would support sharp hand instruments over any kind of rotary instrument, carbide or diamonds. It's not common knowledge so your comment is reasonable, however, completely untrue.
Thank you doc Would like to see a demo of only proximal box class 2, minimal prep , not with occlusal extension, I am struggling with this as in my simulation lab ,everytime my bur ends up going bit further down towards Distal occlusally if preparing a Mesial box only for composite class. 2, have practical exam in a week and my cavity prep still not confining to minimal prep in proximal box only , Also any tips how to view class 2 cavity box prep in manikin indirect vision upper molar please
Keep the bur nearly touching the adjacent tooth when prepping. Shoot for gingival clearance first, then extend facial and lingual. Deep the axial carefully to allow better access. Use a good stable finger rest and take your time...best wishes
Hi Dr. Stevenson, I am wondering if you have an answer for what I am seeing. After placing a composite restoration I noticed on a radiograph that there was a radiolucent area around the filling. I don't know if after light curing the bonding adhesive then packing the composite into place. If the radiolucent area I am seeing is the space where the bonding adhesive lays, or I am not packing the composite correctly. I value your insight and thought you may have the answer. Thanks again. Dr.R
Hi Larry, yes, this is most likely the bonding layer, especially if the bonding resin is not highly filled. OptiBond FL is a filled adhesive and doesn't leave this radiolucent pattern, but many of the Universal adhesives do, as they are much less filled. It's good to blow the adhesive thin and use HVAC to facilitate thinning before curing - this may help as well. If the adhesive layer is too thick, the bond strength will be diminished due to the shift from adhesive to the cohesive failure mode. In other words, the adhesive tears apart intrinsically before the dentin-adhesive interface fails.
thanks for the quick reply. So i just watched the video you did on Class III composite #9 ML fill where you mention not to light cure the adhesive just pack the composite and then light cure. Do you normally suggest not curing the adhesive like this for all your restorations. and will a radiograph not show the radiolucent area under the composite if you do not light cure it?? Thanks for all your wonderful videos. Lanny
It takes practice - but try turing the head in different directions. Take time to set up your instrument position with direct vision before using the mirror.
i find that it's basically impossible to view the enamel wall since this is the upper 6. any tips on how to safely box prep without hitting adjacent tooth and thinning the wall just enough to break it with a gingival marginal trimmer?
I know what you mean - using 3.5x or higher loupes, adjusting your mirror position, and using the "global orientation - finger rest - local execution" technique make it easier. I teach this in my courses - and have great results with the students. View the position of the handpiece and bur with direct vision, then set your finger rest securely, and now look through the mirror with your loupes to initiate the bur movement. Stop and assess often until it becomes possible.
@@StevensonDentalSolutions thank you so much .Your videos are awesome and inspiring. Please advise on how to do without any hand instrument as we are not allowed to use one in this exercise. What's the global technique please?
Gingival Extension or Axial Depth? Axial depth is 0.5 mm into the dentin and at least 1.0 mm total. For typodont teeth we usually find that 1.2-1.5 is good. As far as gingival extension, you extend past the cønact and caries. In most situations, this will create an axial wall height of 1.5-2.0 mm.
What is a reverse "s" curve and why is it indicated? Answer these questions and you'll know the reason why this "S" curve is subtle. Some preps need two of them, some need them on the lingual and some don't require them at all...
Thank you so much for the very informative video Dr. Can we please have a video for class II composite prep on an upper premolar? Once again thank you for the awesome videos and techniques.
Brush strokes are used to smooth the outline but are not practical for the initial prep. Use definitive, directed and purposeful cuts when establishing depth and initial outline.
Hold handpiece perpendicular to occlusal table - be aware of the curve of Wilson, and use a finger rest to lock your position in. Let the 330 do the work and while refining be mindful of the walls and the angles. Focus on the internal line angles at the end and the bur will take care of it.
@@alicerobinson9533 When you refine, you might be altering the convergence - in other words, making the walls divergent - this is common. When you refine the prep, use the 330 0r 245 and focus on the internal line angles, taking care not to extend the cavosurface margin.
OCCLUSAL: Cut to full depth from the beginning - this will limit the bur from widening too much. PROXIMAL: Use the undermine and chip technique, and sharp instruments Tons of practice always helps, IF you have someone evaluate your prep between attempts...
working with the model on the table and not in the mankin like the test and without water and normal patient position is a diservice because thats the critical concern for the test
plus you cant rotate the model to see your flaws,you must be trained as if it a real patient or else youll never get licensed or be effective as a dentist
U did a greatttttt job. Especially with making mistakes like any normal person should do, and accepting them and rectifying them. Bcoz most utubers just show that they make perfect preparations in one go. And that kind of makes me feel bad about myself. Amazing work here.
Thank you!
Thank you for the informative video Doctor. Can you please explain the concept of external and internal 90 degree exit angles a little more in detail in this comment or a different video. Thank you in advance.
the internal angle between the axial wall and the proximal walls should approach 90 degrees, and the angle from the proximal walls and the outer surface of the tooth (the cavosurface angle) should also be 90 degrees.
@@StevensonDentalSolutions Thank you Doctor.
Thank u so much DR.awesome work. Thanks once again for letting us how they evaluate in the dental school.
My pleasure
Great video and demonstation! Can't wait to see more cavity prep tutorials.
I wish I could do this :(
😢same
Hey Doc, any chance you can do a video on sharpening hand instruments and possibly scalers?
best dental teaching channel on youtube right now. Keep it up!!
Thank you for your support!
Doctor Stevenson, thank you for sharing the videos. Also, I have a question for you: do you sale the hand instruments in a kit or individual each one. Thank you very much.
Thank you Dr.. It's very helpful.. 😍😍
Thanks for the video! Question… for class II preps involving the oblique ridge do you have to complete the prep by doing the other little piece on the other side of the oblique ridge?
I have seen cases where a class II prep on tooth #3 or #14 that involve two separate parts, one on either side of the oblique ridge. Thank you!
If the school asks for a separate prep, they will typically specify this: MO + O or MO + OL. If they specify MOL, then you cross the oblique ridge. In clinical practice we always try to preserve the Oblique Ridge...Best, Dr. S
Thank you sir for this helpful video 👏
Great video. Very helpful to learn make class 2 on maxi first molar. Just curious! Was this preparation done in indirect vision?
It was indirect - through a camera while viewing a monitor. Like playing a video game...
Thank you so much Dr Stevenson for the ultimately useful cavity prep tutorial I really enjoyed watching and it made me feel confident before the exam the most importantly
Awesomeness!
This was incredibly helpful, please do more!
Have over 100 videos and counting...more coming every month.
Does the 330 Carbide bur not require any water on the high speed hand piece?
When on the natural tooth - yes, for sure.
I like how you are soooo good at it doc and still making us comfortable by acknowledging mistakes (which are not even mistakes lol). Thank you so much for this highly informative video, it was of great help ❤️❤️
Thank you
Could pls post how to sharpen hand instruments? Thanks a lot for this video.
Excellent video and m a super fan of your video!!! When I work on the box on the facial side with the hatcher on the manikin, it is extremely hard to chip (pt turn away from me). Can you advise?
You may try an Off-angle Chisel, the 45S for the mesial box and the 44s for the distal - other than that, it can be done with a reverse approach and a palm-thumb grasp - tricky but doable!
Thank you so much for your reply, you are a great teacher!
@@innatep4411 Thank you!
Liked and subscribed,watching this at 3 30am. Im currently a second grade dental student in Turkey and really flunked hard on a MOD amalgam preparation on number 15 and 16, and i had to buy another phantom jaw. Watching your other video really did help and I instantly noticed tbe difference following up on some of your methods! What is the likelyhood for a person such as I to work in the U.S or Canada after I graduate? Thanks a lot Doc :)
And this week I have to open Black 3 and 5 restorations and noticed you uploaded those as well! Will definitely watch it in the morning.
@@mehmetsoylu4260 same watching this just a day before my second year final examsss 🥹!
Mai văn quý 2/10/2019
Some make without preserving the ridge? Would that also be right.?
only if caries extended through the oblique ridge, otherwise, no.
@@StevensonDentalSolutions okay thanks alot sir
Today’s my practical test on 36 MO cavity prep, wish me luck
Hope it goes well!
Stevenson Dental Solutions I PASSED!!!!
I'll bet you did well after watching the video! Passing practical exams is the BEST, right?
Stevenson Dental Solutions yeah, thank you so much for this video, doctor. It was really helpful. I think the enamel hatchet is my favourite instrument now hahaha
Could you do a class 2 amalgam prep video on an upper premolar typho. I always make the gingival seat too wide.How can you prevent that? Thanks
Hi - good request - will put this in the queue!
Hello doc. what kind of tooth are you using?
Columbia Dentoform Model 860 teeth were used in this video. (Authentic, made in the USA)
v/ good video
Perfectly done and beautifully explained,Thanks doc 👍
Thank you for your kind words. Best wishes.
Thank you
Can you translate these videos into Arabic, doctor?❤❤❤
Please
I am from syria🇸🇾
I will look into this!
I’d suggest avoid using the binangle chisel, as might lead to micro fractures.
Well, I'd suggest that a good read of the peer reviewed literature would support sharp hand instruments over any kind of rotary instrument, carbide or diamonds. It's not common knowledge so your comment is reasonable, however, completely untrue.
Hey doc, can u please share the link for binangal chisel instruments , I need to buy that
stevensondentalsolutions.com/product/binnacle-chisel-15-8-8/
hi docs.i have trouble preparing cavity in indirect vision. any advise please?
Watch the videos on ergonomics on my channel and reach out after trying a few of the techniques...
Thank you doc
Would like to see a demo of only proximal box class 2, minimal prep , not with occlusal extension, I am struggling with this as in my simulation lab ,everytime my bur ends up going bit further down towards Distal occlusally if preparing a Mesial box only for composite class. 2, have practical exam in a week and my cavity prep still not confining to minimal prep in proximal box only ,
Also any tips how to view class 2 cavity box prep in manikin indirect vision upper molar please
Keep the bur nearly touching the adjacent tooth when prepping. Shoot for gingival clearance first, then extend facial and lingual. Deep the axial carefully to allow better access. Use a good stable finger rest and take your time...best wishes
@@StevensonDentalSolutions thank you
Hi Dr. Stevenson, I am wondering if you have an answer for what I am seeing.
After placing a composite restoration I noticed on a radiograph that there was a
radiolucent area around the filling. I don't know if after light curing the bonding
adhesive then packing the composite into place. If the radiolucent area I am
seeing is the space where the bonding adhesive lays, or I am not packing the composite
correctly. I value your insight and thought you may have the answer.
Thanks again. Dr.R
Hi Larry, yes, this is most likely the bonding layer, especially if the bonding resin is not highly filled. OptiBond FL is a filled adhesive and doesn't leave this radiolucent pattern, but many of the Universal adhesives do, as they are much less filled. It's good to blow the adhesive thin and use HVAC to facilitate thinning before curing - this may help as well. If the adhesive layer is too thick, the bond strength will be diminished due to the shift from adhesive to the cohesive failure mode. In other words, the adhesive tears apart intrinsically before the dentin-adhesive interface fails.
thanks for the quick reply.
So i just watched the video you did on Class III composite #9 ML fill where you mention not to light cure the adhesive
just pack the composite and then light cure. Do you normally suggest not curing the adhesive like this for all your restorations.
and will a radiograph not show the radiolucent area under the composite if you do not light cure it?? Thanks for all your wonderful videos.
Lanny
What happens if gingival seat wider occlusally
If the proximal box is wider occlusal, the retention will be compromised.
Dr. Stevenson!!! I just love u love u love u 😍
So great to hear from you! Hope it's going well in Dental School. Keep in touch!
that enamel hatchet looks is doing such a good job .. we don't have that for the exam only GMT:(((
thank you for this really helpful
Oooh, sorry to her - you can still use the GMT for the extensions...
How to remove unsupported enamel on Distobuccal by Hatchet or GMT when typhodont is mounted?
Hi Doc - either one, but it must be very sharp. Another instrument is the Off-Angle Chisel which is twisted on the shank and allows better access.
@@StevensonDentalSolutions thanks Dr Stevenson for the reply.
Sir I have a question how to use hand instruments in indirect vision in exam? I guess it’s the hardest part
It takes practice - but try turing the head in different directions. Take time to set up your instrument position with direct vision before using the mirror.
What a god lol bravo
i find that it's basically impossible to view the enamel wall since this is the upper 6. any tips on how to safely box prep without hitting adjacent tooth and thinning the wall just enough to break it with a gingival marginal trimmer?
I know what you mean - using 3.5x or higher loupes, adjusting your mirror position, and using the "global orientation - finger rest - local execution" technique make it easier. I teach this in my courses - and have great results with the students. View the position of the handpiece and bur with direct vision, then set your finger rest securely, and now look through the mirror with your loupes to initiate the bur movement. Stop and assess often until it becomes possible.
thank you, although i don't have loupes just yet, it'll be in my training arsenal by next year
@@StevensonDentalSolutions thank you so much .Your videos are awesome and inspiring.
Please advise on how to do without any hand instrument as we are not allowed to use one in this exercise.
What's the global technique please?
Amazing video doctor!!! Very good explanation.
Thank you!
Can you please post a video with easier steps to make occlusopalatal cavity on first molar? Would be very helpful
Upper
OL on Maxillary First Molar? You got it!
@@StevensonDentalSolutions yes please
Thank you, this was very helpful.
Great to know. Thank you for watching.
Thankyou. This video is really helpful
Sir, what is the depth of the proximal box?
Gingival Extension or Axial Depth? Axial depth is 0.5 mm into the dentin and at least 1.0 mm total. For typodont teeth we usually find that 1.2-1.5 is good. As far as gingival extension, you extend past the cønact and caries. In most situations, this will create an axial wall height of 1.5-2.0 mm.
@@StevensonDentalSolutions Thank you very much sir.... You are a good knowledgeable admirable teacher
Cant say enough positive things about him!
Thank you Doctor
Very informative and helpful
This is 26 right?
16. right maxillary molar
We need to start the preparation from buccal side right? Taking the mesiobuccal cusp in case of MO preparation
Thank you so much doctor 💖💖
My pleasure! Dr. S
what about reverse s curve?
What is a reverse "s" curve and why is it indicated? Answer these questions and you'll know the reason why this "S" curve is subtle. Some preps need two of them, some need them on the lingual and some don't require them at all...
Learner so much sir 🙏
Great! Thank you!
Thank you so much for the video
Happy to do this - thank you for comments.
Thanks Doctor
OMG 😮
My most favourite video... Very well explained 👌🏻
Please help with occlusal lingual cavity on upper first molar
Yes - will do!
Love this prep
thank u sooo much doctor for sharing this video it’s so helpful..could u plz post how to prep class ll of lower5 ,6 for amalgam restoration
This is amazing
really impressive!
Glad this helped.
Thank you.
Thanks for watching Doc!
thank youuuu!!!
Thanku
Thank you, Doc!
Thank you Dr. Stevenson for this awesome video!
Thank you so much for the very informative video Dr. Can we please have a video for class II composite prep on an upper premolar? Once again thank you for the awesome videos and techniques.
We have a great video for this on our website - check it out!
could we do brush technique for Class II?
Brush strokes are used to smooth the outline but are not practical for the initial prep. Use definitive, directed and purposeful cuts when establishing depth and initial outline.
Failed my Class II cavity preparation (25) due to inadequate convergence (handpiece angle). Any tips? Thanks
Hold handpiece perpendicular to occlusal table - be aware of the curve of Wilson, and use a finger rest to lock your position in. Let the 330 do the work and while refining be mindful of the walls and the angles. Focus on the internal line angles at the end and the bur will take care of it.
I keep having the same issues
@@alicerobinson9533 When you refine, you might be altering the convergence - in other words, making the walls divergent - this is common. When you refine the prep, use the 330 0r 245 and focus on the internal line angles, taking care not to extend the cavosurface margin.
Why not using matrix
many schools do not allow adjacent tooth protection guides, like a matrix, UltraGaurd, FenderWedge, ETC.
Thanks a lot for this video.....
Happy to provide the info!
I always have difficult time to widen the prep.... it's always a wider prep at the end. Any suggestion please.
OCCLUSAL: Cut to full depth from the beginning - this will limit the bur from widening too much.
PROXIMAL: Use the undermine and chip technique, and sharp instruments
Tons of practice always helps, IF you have someone evaluate your prep between attempts...
working with the model on the table and not in the mankin like the test and without water and normal patient position is a diservice because thats the critical concern for the test
plus you cant rotate the model to see your flaws,you must be trained as if it a real patient or else youll never get licensed or be effective as a dentist