KATO2009 ATTRIBUTION
Historical source notice. Since October 15, 2026 the current ToothForm app package contains no Kato and Ohno geometry: ACTA-DIRECT v2 tooth 0039, a two-rooted lower first molar, replaced its last placement at #19/#30. Build 1.0 (4), prepared on October 14, still contains it. This notice keeps the attribution, reuse status and processing record of the former placements.
Kato and Ohno — university micro-CT tooth surfaces Akiko Kato and Norikazu Ohno (2009). Construction of three-dimensional tooth model by micro-computed tomography and application for data sharing. Clinical Oral Investigations 13, 43–46. https://doi.org/10.1007/s00784-008-0198-4 https://a-kato.agu.ac.jp/English/bottom.html https://a-kato.agu.ac.jp/3D_tooth_models.html Historical notice: since 2026-10-15 the app packages no geometry from these archives. Their converted, repaired and compiled files remain in the local model archive, and this notice keeps their attribution and the record of what was done to them. Former placements: 46RLM1_OBJ.lzh: FDI46, right mandibular first molar → #30, mirror #19; replaced on 2026-10-15 by ACTA-DIRECT v2 tooth 0039, a two-rooted lower first molar (the FDI46 specimen has a third, distolingual root). 16RUM1_OBJ.lzh: FDI16, right maxillary first molar → Universal #3, mirror #14; replaced on 2026-10-12 by ACTA-DIRECT v2 tooth 0158. 44LRP1_OBJ.lzh: FDI44, right mandibular first premolar → #28, mirror #21; replaced on 2026-10-12 by ACTA-DIRECT v2 tooth 0217. Each archive supplies separately registered enamel, dentin and pulp-cavity surfaces. The project describes Shimadzu SMX-225CT acquisition; specimen-specific scan spacing and physical coordinate calibration have not been independently confirmed. The original coordinate scale is retained. Buccal/lingual orientation is not independently labelled; the cervical plane is a display estimate. Reuse status: public university research download, with no confirmed dataset redistribution grant. These files were local prototype sources only and are no longer packaged; permission would be needed before any app redistribution. No Creative Commons license is asserted. The source conversion preserves every original detail triangle, welds only coincident coordinates for computed vertex normals, and applies one shared proper rigid rotation/translation to the three tissues. The opposite side reflects X and reverses triangle winding. The source conversion adds no tissue cleanup, hole filling, synthetic canal, anatomy smoothing, nonuniform scaling or tissue offsets. Before the 2026-10-11 display repair, the atlas used bounded display simplification with original source positions, locked borders and retained source shading normals, and a separately reviewed normal-only derivative reduced CT staircase shading in exterior detail/atlas meshes: Gaussian sigma 0.055 within radius 0.15 source coordinate units, 64 neighbors maximum, area/normal-angle weights, change capped at 25 degrees. In that derivative all non-normal OBJ bytes remained identical. Mirrored normals are exact reflected original-side normals. Pulp geometry and normals are untouched. Source meshes and original unsmoothed display files remain preserved in the local project. CT terrace geometry, open/nonmanifold boundaries and disconnected components are retained outside the display repair described below. In the source, exposed occlusal dentin patches may reflect wear or segmentation; the public low-resolution photographs do not establish which. No fine canal, apical-foramen, expert-anatomy or clinical validation is asserted. Display colors are illustrative, not photographic specimen color. The separate FDI35 DXF candidate was inspected but was not selected for the numbered atlas because of its coarse tessellation and small mesh openings. For the former #3/#14 placement, a later shared proper Y-axis rotation of 180 degrees corrected display orientation based on the single large inferred palatal root and paired buccal roots. All six meshes, including pulp and atlas layers, received exactly the same vertex/normal transform. That step changed no other records or shape. The source FDI16/right identity remains; mesial/distal direction is not independently source-labelled. Earlier normal-only and atlas files remain preserved upstream. Display repair (2026-10-11): at #19/#30 until 2026-10-15 (and, until 2026-10-12, at #3/#14 and #21/#28) the displayed meshes were derived from these sources. Small detached enamel and dentin specks were removed, and porous or perforated occlusal enamel, with the dentin beneath it, was rebuilt as a smooth inferred surface that follows the specimen's own porous enamel, with at least 0.5 mm of enamel over smoothed dentin (Tools/Models/repair_scan_display.swift). The app labels the repair; it is not segmented anatomy. Atlas tiers were re-simplified to 12,000 triangles per tissue from the repaired meshes. Compiled display archives also carry baked optical attributes and smoothed display normals. The source meshes are unchanged.