cavity prep qn

[toothgeek107]

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could someone please kindly tell me the no of line angles in the following cavities:

class 2 simple
class 2 complex
Class 1 cavity

thanks

 

[djeffreyt]

Out of curiosity, why?

If you count every internal line angle and each cavosurface I think you get the following:

2 surface class 2 (simple or complicated): 17
3 surface class 2 (simple or complicated): 22
simple class 1: 12

that's all theoretical of course, the reality is usually very complicated shapes