Effects of remeshing algorithms on trueness of fit when used to compress .stl files for dental models: A narrative review.

Abstract

<h4>Objectives</h4>In recent years, there has been a transition toward using and storing digitized dental models instead of physical casts. The size of .stl files is directly correlated with a need for higher computer processing power, longer operation time and a need for more storage space. Several studies explored the impact of decreasing the mesh resolution to decrease file size while maintaining trueness of fit between the original and modified files. Multiple authors suggested to compress .stl files by removing a fixed percentage of triangular faces. However, certain variables which are not yet fully investigated may impact the outcome of remeshing and compressing .stl files.<h4>Methods</h4>This narrative review explores concepts that may have a significant impact on the outcome of remeshing and compressing .stl file.<h4>Results</h4>When restructuring digital meshes to compress .stl files, variables such as initial mesh density, adaptive resolution, scanning technology, rendition and remeshing algorithms, as well as the clinical situation, can affect the outcome.<h4>Conclusion</h4>Prior to applying subjective compression to .stl files by a static percentage, multiple variables must be considered to ensure trueness of fit is preserved. The results obtained for specific situations may not extrapolate to others.<h4>Clinical significance</h4>Remeshing algorithms used to reduce .stl file size, or to optimize the files prior to manufacturing, may cause the loss of important data. Further research is needed to guide clinicians safely altering digital meshes.