Generally, I've seen some retained resin rather than fractured enamel.
 Any residual resin can be removed.  If the enamel is cracked off, it
is gone.  What to do depends upon the amount of lost enamel.  If it is
small and there is no dentine exposed, you're best off just polishing it
and leaving it unrstored.  This general rule might be modified depending
on where the chipped enamel is, whether it is a cosmetic problem, other
restorations on the tooth, etc.

Steve