Topological Hole Filling for 3D Mesh Dental Models

Development of three-dimensional oral scanning technology has significantly improved accuracy of dental scanning models and greatly increased scale of scanned data. High-precision dental models can capture more details of real teeth, thus assisting medical diagnosis more effectively, but also pose challenges in geometry processing. Scanned dental models exhibit topological flaws, resulting in non-watertight surfaces, which impede downstream tasks. Existing methods for hole repair are inefficient on large-scale mesh models. In this paper, we proposed a topological hole filling method for 3D mesh dental model. Initially, missing internal meshes are filled with tetrahedra using volumetric filling to preliminarily restore topological structure. Subsequently, surface optimization are employed to further restore geometric details, and eventually yielding watertight dental models.