Can a problem occur if a dental crown is not fully seated against the gumline?

I recently received a zirconia (sp?) crown. It fits well in the space, but when I run my tongue along the inside, bottom/gum line- at the base of the crown- it feels like there is a small gap between the base of the new crown and my gum line. Is this space okay or could it lead to a problem if it is not fully seated flat against the gum line? Thanks for your help. Niki