There are various outline forms that are possible for lower 1st molar tooth. The ideal preparation below gets to be asked most often and others are just specific to the guidelines of the school that you will be entering. For example, in UOP, they would rather ask for a big dovetail at the distal end. So if there are any available guidelines, kindly refer to that one. More information for UOP guidelines <here>.

Ideal Preparation MO

Fishtail Preparation

DO Preparation

With Dovetail

DO Preparation