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The Dentino‐enamel Junction is a Broad Transitional Zone Uniting Dissimilar Bioceramic Composites

2000; Wiley; Volume: 83; Issue: 1 Linguagem: Inglês

10.1111/j.1151-2916.2000.tb01181.x

1551-2916

Shane N. White, Michael L. Paine, Wen Luo, Mehmet Sarıkaya, Hanson Fong, Zhaokun Yu, Zhen C. Li, Malcolm L. Snead,

Bone Tissue Engineering Materials

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.