IgG4‐positive plasma cells are more often detected in chronic periapical lesions arising from permanent rather than primary teeth

Aim To characterize plasma cell subsets in chronic periapical lesions affecting permanent and primary teeth. Methodology Only chronic periapical lesions without root canal treatment were selected. Twenty‐one radicular cysts and 7 periapical granulomas affecting permanent teeth and 19 radicular cysts and 4 periapical granulomas affecting primary teeth were assessed for immunoglobulin (Ig) light chain (kappa and lambda), Ig heavy chain (IgG, IgG4,...