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Lab talk, the good, the bad, and the ugly
Dental-CAD
Scanner Data Samples
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<blockquote data-quote="patmo141" data-source="post: 57186" data-attributes="member: 2560"><p>Ok, I'd like to keep this thread short, on topic and OBJECTIVE...so no bashing. Results are results</p><p></p><p><strong>Objective</strong>: To assess the density of data in various mesh examples from different scanners</p><p></p><p><strong>Method</strong>: I take a small sample ~1cm^2 of a mesh from an stl example file. I calculate the total area of all the triangles, and the average length of all the edges and report</p><p></p><p>1. average edge length which is indicative but not perfectly equal to vertex spacing</p><p></p><p>2. Average mesh density = total vertices/total area</p><p></p><p>In some meshes, the density varies greatly over different parts (eg, prep area vs the opposing dentition). In those cases, I report values for two different places on the mesh.</p><p></p><p><strong>Discussion</strong>: It should be noted that because many of these meshes are "processed" by their own CAD software,<strong> these results are not necessarily indicative of scanner accuracy</strong>, no matter how much we would like them to be. For example, you will notice the CEREC opposing mesh has more data than the prep mesh! How can this be!? It's because the prep mesh has been "decimated" meaning that data has been thrown away where it is not needed to improve CAD efficiency in later steps. Also, there is great variation across many of the same meshses and unfortunately, I didn't calculate any statistics or uncertainty. So, grains of salt distributed, it's up to you to put them on the food...</p><p></p><p><strong>Results Summary</strong> (this will be edited with all results as I collect more)</p><p></p><p><u>CEREC AC Prep</u></p><p>vert spacing: 213 microns</p><p>area density: 31.5 verts/mm^2</p><p></p><p><u>CEREC AC Opposing</u></p><p>vert spacing: 148microns</p><p>area density: 63.3 verts/mm^2</p><p></p><p><u>Bruxir Die Model</u></p><p>vert spacing: 63.6 microns</p><p>area density: 292.9 verts/mm^2</p><p></p><p><u>Bruxir Adjacent Model</u></p><p>vert spacing: 133 microns</p><p>area density: 70.5 verts/mm^2</p><p></p><p><u>Bruxir Opposing Model</u></p><p>vert spacing: 129</p><p>area density: 74.7</p><p></p><p><u>3M COS Prep area</u></p><p>vert spacing: 107 microns</p><p>area density: 114 verts/mm^2</p><p></p><p><u>3M COS Adjacent teeth area</u></p><p>vert spacing: 148.9 microns</p><p>area density: 51.7 verts/mm^2</p><p></p><p><u>Origin HD(mode)</u></p><p>vert spacing: 66.6 microns</p><p>area density: 267.5 verts/mm^2</p><p></p><p><u>Origin HD Complex (mode?)</u></p><p>vert spacing: 74.0 microns</p><p>area density: 216.5 verts/mm^2</p><p></p><p><u>Dental Wings Coping</u></p><p>vert spacing: 156 microns</p><p>area density: 53.6 verts/mm^2</p><p></p><p><u>3Shape Full Contour Incisor</u></p><p>vert spacing: 199 microns</p><p>area density: 31.6 verts/mm^2</p><p></p><p><u>3m Coping exp as Rapid Prototype</u></p><p>vert spacing: 77.8 microns</p><p>area density: 186.7 verts/mm^2</p><p></p><p><u>CEREC Blue Coping</u></p><p>vert spacing: 126.7 microns</p><p>area density: 56.35 verts/mm^2</p><p></p><p></p><p></p><p>Comments on methodology or for clarification welcome. Also, posting pictures of actual fits on dies (the ultimate indicator) is encouraged.</p><p></p><p>You can download this .blend file with all the meshes from here. </p><p><a href="http://dl.dropbox.com/u/2586482/mesh_analysis.blend" target="_blank">http://dl.dropbox.com/u/2586482/mesh_analysis.blend</a></p><p></p><p>You can send me a file to add to the mix. STL files only please</p><p><a href="https://www.yousendit.com/dropbox?dropbox=Dental-CAD-FIles" target="_blank">https://www.yousendit.com/dropbox?dropbox=Dental-CAD-FIles</a></p></blockquote><p></p>
[QUOTE="patmo141, post: 57186, member: 2560"] Ok, I'd like to keep this thread short, on topic and OBJECTIVE...so no bashing. Results are results [B]Objective[/B]: To assess the density of data in various mesh examples from different scanners [B]Method[/B]: I take a small sample ~1cm^2 of a mesh from an stl example file. I calculate the total area of all the triangles, and the average length of all the edges and report 1. average edge length which is indicative but not perfectly equal to vertex spacing 2. Average mesh density = total vertices/total area In some meshes, the density varies greatly over different parts (eg, prep area vs the opposing dentition). In those cases, I report values for two different places on the mesh. [B]Discussion[/B]: It should be noted that because many of these meshes are "processed" by their own CAD software,[B] these results are not necessarily indicative of scanner accuracy[/B], no matter how much we would like them to be. For example, you will notice the CEREC opposing mesh has more data than the prep mesh! How can this be!? It's because the prep mesh has been "decimated" meaning that data has been thrown away where it is not needed to improve CAD efficiency in later steps. Also, there is great variation across many of the same meshses and unfortunately, I didn't calculate any statistics or uncertainty. So, grains of salt distributed, it's up to you to put them on the food... [B]Results Summary[/B] (this will be edited with all results as I collect more) [U]CEREC AC Prep[/U] vert spacing: 213 microns area density: 31.5 verts/mm^2 [U]CEREC AC Opposing[/U] vert spacing: 148microns area density: 63.3 verts/mm^2 [U]Bruxir Die Model[/U] vert spacing: 63.6 microns area density: 292.9 verts/mm^2 [U]Bruxir Adjacent Model[/U] vert spacing: 133 microns area density: 70.5 verts/mm^2 [U]Bruxir Opposing Model[/U] vert spacing: 129 area density: 74.7 [U]3M COS Prep area[/U] vert spacing: 107 microns area density: 114 verts/mm^2 [U]3M COS Adjacent teeth area[/U] vert spacing: 148.9 microns area density: 51.7 verts/mm^2 [U]Origin HD(mode)[/U] vert spacing: 66.6 microns area density: 267.5 verts/mm^2 [U]Origin HD Complex (mode?)[/U] vert spacing: 74.0 microns area density: 216.5 verts/mm^2 [U]Dental Wings Coping[/U] vert spacing: 156 microns area density: 53.6 verts/mm^2 [U]3Shape Full Contour Incisor[/U] vert spacing: 199 microns area density: 31.6 verts/mm^2 [U]3m Coping exp as Rapid Prototype[/U] vert spacing: 77.8 microns area density: 186.7 verts/mm^2 [U]CEREC Blue Coping[/U] vert spacing: 126.7 microns area density: 56.35 verts/mm^2 Comments on methodology or for clarification welcome. Also, posting pictures of actual fits on dies (the ultimate indicator) is encouraged. You can download this .blend file with all the meshes from here. [URL="http://dl.dropbox.com/u/2586482/mesh_analysis.blend"]http://dl.dropbox.com/u/2586482/mesh_analysis.blend[/URL] You can send me a file to add to the mix. STL files only please [url]https://www.yousendit.com/dropbox?dropbox=Dental-CAD-FIles[/url] [/QUOTE]
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