The Illusory Sheath of Neumann in Dentin

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Abstract
Two new techniques have thrown light on this controversial problem. The common conception of Neumann''s sheath is that dentinal tubules are lined with a highly acid resistant, modified dentin matrix, which can be isolated by macerating dentin with 25-50% nitric acid*. Others claim that these isolated structures are not linings of tubules, but represent dentinal fibers. With the first technique, a partial incineration-decalcification method, little tubes are isolated, apparently substantiating the sheath of Neumann, showing it to be an amazingly resistant structure. The second technique, an over-decalcification of the dentin, shows a partial destruction of the matrix in the area, supposedly occupied by the sheath, leaving the dentinal fibers intact. The author concludes that the structures surviving dentin maceration are tubular; these do not represent Neumann''s sheaths, but are tubular processes of the odontoblasts. The highly resistant character of the dentinal fibers necessitates research in dentin physiology.

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