I am a newbie to preclinicals and sorry to bother you.. In our labs, the instructors keep talking about the "ferrule effect" It keeps goin over my head again and again..my frnds tried explaining it tom me but i couldnt get it fully cleared..what exactly is a ferrule and what is the ferrule effect with regards to tooth preps? how does it look, what is its purpose and how does one achieve it? are they required on every tooth or just any anterior or posterior only? what would happen if someone completely ignored this concept? these questions are killing me...can someone explain these things to me? any supportive links on the internet would be highly appreciated... thanks a ton..