It is not uncommon for more food to collect around the gum line of an implant crown as compared to a natural tooth especially in the molar region, because the implant is narrower right at the gum line than an actual tooth. It is best to have a good fit to the gum with the the crown restoration so that this can alleviate some of those issues, although it will still be a bit of an issue. On a positive note, decay does not occur around an implant so you have alleviated one source of failure and water piking has advantages for the health of your entire mouth.
