Hyaline ring granuloma of the mouth-A foreign-body reaction that dentists should be aware of: Critical review of literature and histochemical/immunohistochemical study of a new case.

Hyaline ring granuloma (HRG) is a rare and atypical foreign-body granulomatous chronic inflammatory condition. Our aim was to make a critical review of the literature cases and also to illustrate histochemical and immunohistochemical findings of a new case. A modified PICO strategy was used.