330
Started by dWiz
330 bur is the standard operative bur here at Pacific
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I might be a nOOb to this whole thing, but I would say a good thing to consider when choosing a bur would be to think about what you are wanting to accomplish.
For an amalgam a 330 will allow you to provide adequate resistance/retention with little effort, eg, the inverted pear shape gives you converging walls. Moreover, in preclinic its length (1.5mm) will give you a great guide for depth in your prep. However, say in a Class II situation a 330, IMO, will be difficult to see interprox. I would use a 245 here
For composite where retention is not as important I would go diamond, cuts faster and the last longer.
Inlay/only preps need divergent walls, hence a 330 will require a little more work. It has been a while, I cannot remember what my bur of choice was!
Crowns, veneers ect. are a whole new can of worms
My, avoiding studying, two cents,
-C
For an amalgam a 330 will allow you to provide adequate resistance/retention with little effort, eg, the inverted pear shape gives you converging walls. Moreover, in preclinic its length (1.5mm) will give you a great guide for depth in your prep. However, say in a Class II situation a 330, IMO, will be difficult to see interprox. I would use a 245 here
For composite where retention is not as important I would go diamond, cuts faster and the last longer.
Inlay/only preps need divergent walls, hence a 330 will require a little more work. It has been a while, I cannot remember what my bur of choice was!
Crowns, veneers ect. are a whole new can of worms
My, avoiding studying, two cents,
-C
I've never been a fan of using the 245 because I feel like I lose control of the bur and can't shape the prep nearly as well. I use the 330 even interproximally, because I can make much more precise cuts with it, and can control the box better.
I feel like the 330 is great clinically as well because it cuts to an almost perfect depth occlusally; it's too easy to go too deep with the 245. I usually make the occlusal outline to the length of the 330, and then use a #4 or 6 on slow speed to excavate any caries on the pulpal floor. So far, it's worked really well.
Operative burs: 330/332 & #6/8 (almost all the time), 245 (less often).
I love the 330 for the fact that on the occlusal part of my preps I get a very constant depth and retention form, but when I drop the box I go for the 245 just because I can see the bur angle a little better. I pretty much just comes down to your preference because they both get the job done in the end.
J
jackbauer!
I agree with pretty much everyone..... 330 for occlusal, 245 for interproximal slot, and 556 for smoothing.
It is very easy to go deep with 245.
jb!🙂
It is very easy to go deep with 245.
jb!🙂
Isn't a 556 crosscut?
what's a 245? we use the 169/56 here.
though the 330 is my favorite bur ever...😀
though the 330 is my favorite bur ever...😀
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Yup. In addition to smoothing operative preps, it does magnificent alveoloplasties in a Hall drill. 😉
A 245 is a slightly reverse-tapered longer but. It's something between the taper of a 330 and a straight 56 (like the reverse of the 169 taper), and it is end cutting. We don't use it in pre-clinic at our school either, but lots of schools have them. They create a natural convergent undercut that some schools teach to do in Amalgam preps...not all schools teach that technique either.
At our schol the 330 and 56 are our standards. we use the assortment of other burs too, but that's all preference. The instructors mostly show us that to do any operative prep, it can be done with these two burs...but if you wan to use a 329, 556, 171, or whatever...go for it.
I have to agree with Ocean. The 245 is almost always my first choice. In school it doesn't matter so much, but in the real world it gets very annoying to change burs. I want to cut the prep and be done with it. My assistants have been instructed to hide all the 330s that the old doctor used to use because I don't want them in my handpiece when I sit down.
245 and a round bur is all that's needed.
245 and a round bur is all that's needed.
Amen Ocean! Personally though I grab for the 330 just ahead of the 245 for operative, of course I use a diamond coated 330, and that bur just LOVES to cut tooth!
Angulation though is all in the wrist. Heck, just roll that wrist over and you can cut easily a 45 degree taper with the most parallel of cylindrical shaped burs😉
