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The Dentino‐enamel Junction is a Broad Transitional Zone Uniting Dissimilar Bioceramic Composites
Author(s) -
White Shane N.,
Paine Michael L.,
Luo Wen,
Sarikaya Mehmet,
Fong Hanson,
Yu Zhaokun,
Li Zhen C.,
Snead Malcolm L.
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01181.x
Subject(s) - enamel paint , dentin , bioceramic , materials science , composite material , brittleness , gradation , computer science , computer vision
The dentino‐enamel junction (DEJ) couples a hard, brittle, stiff layer of enamel to underlying flexible and resilient dentin. Prior microscopic images have shown an abrupt demarcation between enamel and dentin; however, new data on protein expression suggests a graded transition. In this study, Vickers microindentations reveal a gradation in hardness with a wide transitional zone across the DEJ region. Therefore, the DEJ must be regarded as a broad transitional region between two interacting tissues, not as a discrete interface. This zone may reduce stress concentrations and act as an important toughening mechanism between mechanically and structurally dissimilar tissues.