title: Scanning electron microscopy subsequent to a combined treatment of NaOCl and EDTA in some non-collagenous calcified matrixes.
abstract: Using backscattered electron (BSE) imaging and scanning electron microscopy, subsequent to a combined treatment of sodium hypochlorite (NaOCl) and ethylenediamine tetra-acetic acid (EDTA) or only with EDTA etching, we observed some structures of non-collagenous calcified matrixes with the aim of revealing the correlation of deposition between calcification degree and organic amount. In human tooth enamel, the NaOCl-EDTA method eroded more intensively the hypocalcified prisms of enamel tufts containing a relatively large amount of EDTA-insoluble organic matter than the hypercalcified normal prismatic enamel containing a small amount of the organic matter. Afibrillar cementum, one of the non-collagenous calcified tissues similar to the enamel, has been reported to consist of organic-rich and poor incremental lamellae. The BSE imaging showed an alternation pattern of hypocalcification and hypercalcification. The hypocalcified lamellae were retained by EDTA etching, while the hypercalcified lamellae showed a resistance against the NaOCl-EDTA method. In the non-collagenous calcareous concretions of human pineal body, organic-rich and poor, and hyper- and hypocalcified incremental lamellae have been reported. The deposition pattern of calcification degree and organic amount was similar to that in afibrillar cementum, and the hypercalcified lamellae showed a resistance against the NaOCl-EDTA method. In conclusion, the high and the lower calcified regions of non-collagenous calcified matrixes contained smaller and larger amounts of EDTA-insoluble organic matter respectively. Moreover, scanning electron microscopy subsequent to the NaOCl-EDTA method corresponding to the BSE imaging clearly showed fine calcified structures compared with the BSE imaging.
authors.affiliation: Second Department of Oral Anatomy, Showa University School of Dentistry, Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kodaka
authors.forename: T
authors.initials: T
authors.lastname: Sano
authors.forename: R
authors.initials: R
authors.lastname: Mori
mesh_terms: D002113:Calcification, Physiologic; D003739:Dental Cementum / Q000648:ultrastructure*; D003743:Dental Enamel / Q000648:ultrastructure*; D004492:Edetic Acid / Q000494:pharmacology*; D006801:Humans; D008855:Microscopy, Electron, Scanning / Q000379:methods*; D010870:Pineal Gland / Q000648:ultrastructure*; D012973:Sodium Hypochlorite / Q000494:pharmacology*
chemical_list: D004492:Edetic Acid; D012973:Sodium Hypochlorite