Operative Class I Question

[printer21]

https://dl.dropboxusercontent.com/u/9032332/Untitled.png

Simple question.. which is more correct for for a class I preparation? Left or right?

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[Waldo2012]

Neither. The left has better angles but doesn't have retention. Right has a bit of an undercut but not smooth walls.

 

[Nat426]

Also your material choice drives your prep form. Gold, composite, amalgam?

 

[Screwtape]

gut instinct goes with left, but i concur that material choice would help answer the question.

 

[Bereno]

To be technical, the left is more correct though both are no good. Assuming an amalgam resto...