The 3D microstructure of dentinal tissue, the main tissue of the tooth, is the subject of an increasingly comprehensive body of knowledge. The relationship between this microstructure and the mechanical behaviour of dentinal tissue remains, nonetheless, under question. This article proposes an original SEM analysis of dentin microstructure, accounting for lateral branches, and a mechanical model based on these findings. An interesting observation is that lateral branches have a dense collar, as do tubules. The diameter of these branches as well as a percentage area are quantified all along the depth of a dentin sample. We use these unprecedented data to build an orthotropic homogenized model of dentin. The heterogeneities of microstructure are taken into account using level-set functions. The results reveal that the lateral branches slightly influence the global homogenized elastic behavior of the dentin tissue, albeit creating stress concentration areas that are highly influenced by the inclination of the traction with respect to the tubule and branches.

牙齿的主要组织牙本质组织的3D微观结构是越来越全面的知识体系的主题。然而，这种微结构与牙本质组织的机械行为之间的关系仍然存在疑问。本文提出了对牙本质微观结构的原始SEM分析，考虑了侧向分支，并基于这些发现提出了力学模型。一个有趣的发现是，侧枝和小管一样具有密集的衣领。这些分支的直径以及面积百分比均沿牙本质样品的深度进行定量。我们使用这些空前的数据来建立牙本质的正交各向异性均质化模型。使用水平集函数考虑了微观结构的异质性。