Koppang HS, Koppang R, Solheim T, Aarnes H, Stolen SO: Identification of cellulose fibers in oral biopsies. ScandJ Dent Res 1987; 95: 165-73.Abstract -Oral biopsies comprising five periapicai cysts, three cases of exuberant granulation tissue in extraction sockets and one case of a mandibular radiopaque structure, all displaying material consistent witb cellulose fibers on routine histologic examination, were subjected to bistochemical, polarization, fluorescence and scanning electron mieroscopical, entrgy dispersive X-ray and chemical investigations. Rontine screening of periapicai lesions v^ith polarization microscopy and identification of possible cellulose libers with Calcolluor White is advocated. Further, attention is drawn to endodontic paper point material as an etiologic factor in postendodontic periapicai inflammatory processes.