Ideal Class 3 Prep

[684046]

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[Vicviper]

You're talking about on plastic teeth right? Main thing is to use a small and sharp bur that you can make clean cuts with, which reduced the need for refining. For this I love the 34 bur, which is a small wedge shape, or the 330. For plastic teeth, most instructors will not even be able to tell the difference between 1.5 and 2mm, after all, you're talking about depth on a curved surface. I wouldn't worry too much, just be sure you're at least 1.5, and they won't be able to say you're too shallow.

For real teeth, throw all those rules and guidelines out the window, they don't really apply anymore. Get the caries out where ever it leads you, and fill it! 😉

 

[WheatLom]

You are likely coming at the preparation perpendicularly, you need to come in on the line angle using proper anglulation. This creates a more conservative axial wall, bucco/lingual depth, and then you can use other burs (330) to extend inciso-gingival

I would also say start .25mm above gingival clearance so you don’t over extend gingivally. Then extend half way to contact using proper angulatio. Keeping the bur shape in mind.

 

[Typical Average Student]

Measure the length of the bur tip and make sure you don't go past that mark.