An E-max crown, is an all-glass ceramic, metal free crown made from the highest grade of durable, longer lasting ceramic called, lithium disilicate.  It is considered to be a preferred choice by many patients due to its natural-looking esthetic qualities and its unlikelihood to be noticed amongst natural teeth.   It is important to note that the E-max crown does not have a metal alloy base that avoids any unsightly looking grey lines around the gum line.