ULTRASTRUCTURAL CHANGES IN EDTA TREATED DENTAL ENAMEL.
Research progress rept.,
NAVAL DENTAL RESEARCH INST GREAT LAKES ILL
Pagination or Media Count:
Enamel samples treated with EDTA for 2, 4, 7, and 24 hours respectively were examined with the SEM and compared to the appearance of sound, untreated enamel. It was apparent that the EDTA demineralized the rods from their peripheral borders centrally, thus progressively delineating these structures. A variety of prism forms were described, with the keyhole and arcade variants predominating. Hexagonal and polygonal forms were not seen. Interprismatic material could not be positively identified. The prism-less zone and its reported crystallite orientation was supported by the findings in this study. Enamel rods from the striae of Retzius were studied and compared with those from intervening regions. Significantly fewer crystallites were present in prisms from the striae than from the adjacent contiguous areas, thus providing additional support that this region may represent an area of hypomineralization. Progressive loss of surface coatings by EDTA action were demonstrated revealing what appeared to be sub-surface continuity with prism sheaths and intercrystalline material. Author
- Medicine and Medical Research