Thank You for this very well-presented informative video! Finally I found a decent instructional video for class 2 on maxillary premolar. I'm a dental student and your videos are of big help...definitely worth subscribing.
Amazing! I just finished the WREB licensing exam this past weekend, and this would have been a phenomenal addition of knowledge for my Class II preparation. A couple professors at my school say they know you; one a friend and another your classmate in dental school! The latter said you were holding a CE course sometime soon at UOP, but I wasn't able to find information on it. I would love to know if you'll be holding a course in the SF area anytime soon. Thank you for your wonderful videos!
Dear Dr. Stevenson, Could you please explain the concept of exit angles with an example of maxillary 2nd premolar? It's a little hard for me to imagine. I tried extrapolating the concept you discussed in #30 class2 but most of the times it's a hit and miss on maxillary premolars for me. Especially with MOD cavity. It would be very helpful if you could draw the outline or perhaps sometime you could make a video on MOD #13 or #4. 🙏 Thank you so much for being our light of knowledge. Best regards, Adi
DR. Stevenson I am having a problem with #13 DO dove tail mounted on the pole, I don't have any problem with #4 on the pole neither #13 on a table, it's very challenging with the mirror. Either dove tail gets larger or accidentally passed too far marginal ridge area leaning mesially and facially for divergence. Thank you for the videos..
Good day Dr stevenson hope everything is ok with you just want to say that because of your valuable you tubes and advices I was able to achieve a good scoring in the technical tasks don't know how to thank u but unfortunately was not able to clear the osce parts of diagnosis and clinical management and the effective communication which I really don't know how to start over again and focus on these two parts which till now don't know how to study them .as I studied hard and have all the information but was not able to arrange those information the way the wanted Just want to thank u again Dr and strongly encourage everyone to watch your you tubes and if you have any advice for me I really appreciate that
Use thin burs like the 169L or even a small flame like the 7901 to achieve clearance. The rest will be with the burs as best as you can. Too bad they don't allow hand instruments! Strange.
@@StevensonDentalSolutions for gingival clearance how to visualise the bur inclination , if it parallel to the marginal ridge it is not perpendicular to the floor
Great video from an awesome professor. My school doesn't provide hand.instruments 😪. Which bur should be used to remove undermined enamel and plan the walls?
Great video! does the dove tail need to be extended in the same buccal position of the box? And is it recommended to start with 7 o'clock in the direct vision to do this class 2 prep?
Not sure what you mean by the dove tail extending in the same buccal position of the box - the dave tail usually extending buccally about 0.5 mm or more towards the buccal wider than the isthmus. I's do the entire prep from 11 or 12 o'clock.
Dear Dr. Stevenson, Could you please share some tips to finish the class 2? Most schools don't provide slow speed for exams in that case what is the best way to get a nice and smooth surface in class 2? Many times my line angles in the box don't look defined and the occlusal cavosurface margins look sharp as well. I have tried running 330 in low speed (high speed handpiece with low foot pedal pressure) but it still doesn't look smooth.. the fear of widening the isthmus is of course present. Hatchet leaves scratches too. Someone suggested I try using dull burs like 245 to polish the prep. Haven't tried it yet. I know one school that might give us a slow speed handpiece but I haven't ever practiced in that setting. Would you suggest I give it a shot directly in the exam? Eagerly waiting for your MOD preparation guidance on #13/ #4. 🙏 Thank you so much for clearing so many of my doubts. 🙏 Best regards , Adi
I've never found that dull burs are a good idea for smoothing - but rather sharp burs with a feather or brush stroke - aimed at the sharp areas, not the entire wall.
Hi Dr, for class 2 proximal box, buccal wall needs to be convergent relative to gingival and lingual wall at right angle to the gingival in the upper premolars and molars as well just like the lowers?
Not exactly. For maxillary teeth the lingual wall is convergent relative to the gingival wall. The facial wall forms a right angle with the gingival wall. For mandibular teeth the lingual wall forms a right angle with the gingival wall, while the buccal wall is convergent relative to the gingival forming an acute angle. Easiest way to remember this principle is that the wall adjacent to the functional cusp is always convergent.
@@StevensonDentalSolutions hello Dr. Thank you for the great videos. so, are you saying one wall should be parallel to the gingival wall and one wall should be convergent?(as it has an acute angle?)
Thank you for the question! The buccolingual dimension is determined by the contact area and the need to break contact, by 0.3-0.5 (ideally). The mesiodistal dimension is determined by the need to prepare into dentin on the axial wall and to go at least 1 mm. Since this is a plastic tooth, the measurement for the gingival width (the proper term is axial depth) should be 1-1.5 mm at the gingival, but I recommend 1.2-1.4 mm to be within the ideal range. You didn't ask about the occlusogingival dimension but I'll add this information too: the gingival wall is located 0.5-1.0 mm apical to the contact area. So you can see there is no standard measurement for the box - it is entirely dictated by its environment.
330 = 1.6 mm = ideal pulpal depth minimum 245 = 3 mm = good start to dropping proximal box, but gingival wall location is determined by need to break gingival contact. both the 330 and 245 are 0.8 mm wide. The axial depth, measured at the gingival is 1.2-1.4 mm which is about 1.5 x the bur width.
Hi all, I'm 4 month away from the practical part of my exam to get my approbation (Germany). I need your help to figure out a little problem I have (teeth, phantom head, armamentarium are not a problem). In the exam we are required to work with water cooling, yet all the dental motors don't have that option, anyone got an Idea how I can get a water cooling setup at home? (without ruining my self too much). Thx.
There are many systems online (eBay) that sell water systems, however, water collection becomes the challenge...You may be able to use an extra large rubber glove around the typodont to collect the water.
@@StevensonDentalSolutions thx doc, the water ist collected in phantom head (Frasaco). But could you be a bit specific about the system, or build references?
Me watching this just before doing on patient 💀💀 my typho work never completed coz of covid in 2020 and now I'm in final year and have to do real patients 🤡🥺🥺 Thanks for video
Thank You for this very well-presented informative video! Finally I found a decent instructional video for class 2 on maxillary premolar. I'm a dental student and your videos are of big help...definitely worth subscribing.
Thank you! All the best.
Thank you and wishing you the best in your journey! If you ever have a prep request - anything - let me know.
I have been following you from Egypt , we love you doctor , That was very helpful ❤️❤️
Great! Thank you for watching...
Amazing! I just finished the WREB licensing exam this past weekend, and this would have been a phenomenal addition of knowledge for my Class II preparation. A couple professors at my school say they know you; one a friend and another your classmate in dental school! The latter said you were holding a CE course sometime soon at UOP, but I wasn't able to find information on it. I would love to know if you'll be holding a course in the SF area anytime soon. Thank you for your wonderful videos!
Thank you Doc - check it out: reg.abcsignup.com/reg/event_page.aspx?ek=0036-0020-4f0d72f04ca042f4aa1ae2f0eaa7eb6b
watching you from the UK very nicely done
Thank you, Doc.
Dear Dr. Stevenson,
Could you please explain the concept of exit angles with an example of maxillary 2nd premolar? It's a little hard for me to imagine. I tried extrapolating the concept you discussed in #30 class2 but most of the times it's a hit and miss on maxillary premolars for me. Especially with MOD cavity. It would be very helpful if you could draw the outline or perhaps sometime you could make a video on MOD #13 or #4. 🙏
Thank you so much for being our light of knowledge.
Best regards,
Adi
I sure will, and thank you for your suggestion! Dr. S
Amazing !!
Thank you, Dr. S
Hello Dr. Stevenson, can you please add wax up exercise video, as in Colorado bench test?
Thank you
Oh, that's a good topic - sure will!
Thanks Doc. Love it!
Thank you!
Watching you from Iraq , thx dr 🤍🫂
Awesome! Dr. Stevenson
Thnx doctor plz do all.classes in this way
Thank you!
Thank you very much Dr..your video is really helpful for dental student..hope you can upload more videos on cavity preparation in the future.
Will do! Thank you.
Superb
Keep it up👍
Thank you!
Thanks doctor
Thank you for watching and the comment!
Thank you, Doctor💚💙
Thank you!
Thank u doctor, it really helped me.
Awesome!
Thank
My pleasure
May I know if you are inclining the bur when you are doing the buccal wall?
Yes, just enough to compensate for the convergent nature of the bur in order to create an orthogonal gingival buccal angle.
It’s so perfect
Thank you doc!
DR. Stevenson I am having a problem with #13 DO dove tail mounted on the pole, I don't have any problem with #4 on the pole neither #13 on a table, it's very challenging with the mirror. Either dove tail gets larger or accidentally passed too far marginal ridge area leaning mesially and facially for divergence. Thank you for the videos..
This is the time when you must use direct vision. Lean the head towards you, fully reclined, and watch the bur move directly.
Wonderful 🙏🏻
Thank you, Doctor!
Wowwww 👍🏻 thank you
Thank you Doc
Can you please demonstrate amalgam carving on the lower second premolar please.. I am really struggling with it.
@@iffatkhan6959 Good idea - will do!
Good day Dr stevenson hope everything is ok with you just want to say that because of your valuable you tubes and advices I was able to achieve a good scoring in the technical tasks don't know how to thank u but unfortunately was not able to clear the osce parts of diagnosis and clinical management and the effective communication which I really don't know how to start over again and focus on these two parts which till now don't know how to study them .as I studied hard and have all the information but was not able to arrange those information the way the wanted
Just want to thank u again Dr and strongly encourage everyone to watch your you tubes and if you have any advice for me I really appreciate that
Great!
Dr; what should the angles be of the lingual and buccal walls on the distal surface?
The same - 90 degrees relative to the unprepared surface or minimally flared.
Thank you so much,amazing demonstration. My school doesn't allow hand instruments for class 2 , any advice please?
Use thin burs like the 169L or even a small flame like the 7901 to achieve clearance. The rest will be with the burs as best as you can. Too bad they don't allow hand instruments! Strange.
@@StevensonDentalSolutions thank you so much
@@StevensonDentalSolutions for gingival clearance how to visualise the bur inclination , if it parallel to the marginal ridge it is not perpendicular to the floor
Great video from an awesome professor.
My school doesn't provide hand.instruments 😪.
Which bur should be used to remove undermined enamel and plan the walls?
Use the 169L in the box and a 330 or 245 on the occlusal
What is the thickness of the proximal box from axial wall to outwards doc
1.2-1.4 mm on plastic teeth and 0.5 mm into dentin on real teeth (at least 1.0 mm) This measurement is termed the "Axial Depth."
Great video! does the dove tail need to be extended in the same buccal position of the box? And is it recommended to start with 7 o'clock in the direct vision to do this class 2 prep?
Not sure what you mean by the dove tail extending in the same buccal position of the box - the dave tail usually extending buccally about 0.5 mm or more towards the buccal wider than the isthmus. I's do the entire prep from 11 or 12 o'clock.
Stevenson Dental Solutions Thanks! I see what u mean, the dovetail needs to extend 0.5 mm buccally, and it is not related to the box.
Cool - glad this makes sense. Thank you for your question!
Dear Dr. Stevenson,
Could you please share some tips to finish the class 2? Most schools don't provide slow speed for exams in that case what is the best way to get a nice and smooth surface in class 2? Many times my line angles in the box don't look defined and the occlusal cavosurface margins look sharp as well. I have tried running 330 in low speed (high speed handpiece with low foot pedal pressure) but it still doesn't look smooth.. the fear of widening the isthmus is of course present. Hatchet leaves scratches too. Someone suggested I try using dull burs like 245 to polish the prep. Haven't tried it yet.
I know one school that might give us a slow speed handpiece but I haven't ever practiced in that setting. Would you suggest I give it a shot directly in the exam?
Eagerly waiting for your MOD preparation guidance on #13/ #4. 🙏
Thank you so much for clearing so many of my doubts. 🙏
Best regards ,
Adi
I've never found that dull burs are a good idea for smoothing - but rather sharp burs with a feather or brush stroke - aimed at the sharp areas, not the entire wall.
I struggle with the buccal wall of the box as.it is always divergent. Any advice
Look from the mesial while refining and visualize the bur straight up and down.
Hi Dr,
for class 2 proximal box, buccal wall needs to be convergent relative to gingival and lingual wall at right angle to the gingival in the upper premolars and molars as well just like the lowers?
Not exactly. For maxillary teeth the lingual wall is convergent relative to the gingival wall. The facial wall forms a right angle with the gingival wall. For mandibular teeth the lingual wall forms a right angle with the gingival wall, while the buccal wall is convergent relative to the gingival forming an acute angle. Easiest way to remember this principle is that the wall adjacent to the functional cusp is always convergent.
@@StevensonDentalSolutions perfect 👍..thanks alot!
@@StevensonDentalSolutions hello Dr. Thank you for the great videos. so, are you saying one wall should be parallel to the gingival wall and one wall should be convergent?(as it has an acute angle?)
because in this case, only one wall would be convergent and the other not, am i right?
I wish i could use hatchets this well.
Thanks - sharp edges and lots of practice.
what is the function of 330 bur and 245 bur?
330 Occlusal - pulpal depth, convergence and outline. 245 Proximal box.
Do you the occlusal lock distal to the buccal fissure? Thanks
Yes about 0.5 mm towards the buccal
what is the best type of typodont to use if university doesn't say any type specifically?
Accidental is my favorite.
Can you pls make a video of upper premolar amalgam cusp build up
It's on my list, thank you!
why divergent the dovetail?
Resistance form so the marginal ridge is not weakened
Hi..how wide should the proximal box be buccolingually and mesiodistally?
Thank you for the question!
The buccolingual dimension is determined by the contact area and the need to break contact, by 0.3-0.5 (ideally). The mesiodistal dimension is determined by the need to prepare into dentin on the axial wall and to go at least 1 mm. Since this is a plastic tooth, the measurement for the gingival width (the proper term is axial depth) should be 1-1.5 mm at the gingival, but I recommend 1.2-1.4 mm to be within the ideal range. You didn't ask about the occlusogingival dimension but I'll add this information too: the gingival wall is located 0.5-1.0 mm apical to the contact area. So you can see there is no standard measurement for the box - it is entirely dictated by its environment.
@@StevensonDentalSolutions thankyou so much!
Please repeat the measurement of burs and how it relate to cavity to depth and width
330 = 1.6 mm = ideal pulpal depth minimum
245 = 3 mm = good start to dropping proximal box, but gingival wall location is determined by need to break gingival contact.
both the 330 and 245 are 0.8 mm wide. The axial depth, measured at the gingival is 1.2-1.4 mm which is about 1.5 x the bur width.
Hi all, I'm 4 month away from the practical part of my exam to get my approbation (Germany).
I need your help to figure out a little problem I have (teeth, phantom head, armamentarium are not a problem).
In the exam we are required to work with water cooling, yet all the dental motors don't have that option, anyone got an Idea how I can get a water cooling setup at home? (without ruining my self too much).
Thx.
There are many systems online (eBay) that sell water systems, however, water collection becomes the challenge...You may be able to use an extra large rubber glove around the typodont to collect the water.
@@StevensonDentalSolutions thx doc, the water ist collected in phantom head (Frasaco). But could you be a bit specific about the system, or build references?
Me watching this just before doing on patient 💀💀 my typho work never completed coz of covid in 2020 and now I'm in final year and have to do real patients 🤡🥺🥺 Thanks for video
Best wishes to you!
Oô