🎉Result Release!🎉 Task 1: Segmentation Task 2: Registration Task 3: MMDental
STS 2026 : The 4th Semi-supervised Teeth Segmentation Challenge on Metal Artifact Reduction and Beyond
MICCAI 2026, Strasbourg, France
September 27-October 1, 2026
Task 2 Winners: CBCT-IOS Registration
Task 2 evaluates rigid registration between intraoral scans (IOS) and CBCT volumes. Teams submit upper- and lower-jaw transformation matrices that align the high-resolution IOS crown surfaces with the CBCT roots, bone and surrounding anatomy, and are assessed with the Mean Translation Error (MTE, mm) and Mean Rotation Error (MRE, degree); lower is better for both.
The final ranking is based on the official Docker test evaluation published on the Codabench competition page; the Codabench validation leaderboard is not used for the final ranking. Failed or missing pairs receive fixed worst-case penalties, and the top three teams are highlighted below.
| Team | MTE (mm, ↓) | MRE (deg, ↓) | Successful / Total Pairs | Status | Final Rank | Links |
 avalanchezy |
7.902523 | 2.862457 | 198/198 | Success | 🥇 1 | |
| qingfeng |
39.334334 | 11.696383 | 198/198 | Success | 🥈 2 | |
| aimagelabzip |
10114.828872 | 36.122669 | 160/198 | Completed with Errors | 🥉 3 |
Report
Slides
CodeAdditional Analysis: Left-Handed Coordinate Samples Excluded
Because of coordinate-system orientation inconsistencies in the dataset, the organizers also evaluated the submissions after excluding samples with left-handed coordinate systems. The results are shown below for reference only; the final ranking and awards are determined by the main table above.
| Rank | Team | Weighted Translation Error (mm, ↓) | Weighted Rotation Error (deg, ↓) | Successful / Total Pairs | Failed Pairs | Status |
| 1 | aimagelabzip |
6.752031 | 1.976201 | 160/162 | 2 | Completed with Errors |
| 2 | avalanchezy |
8.543497 | 2.612932 | 162/162 | 0 | Success |
| 3 | qingfeng |
45.399751 | 11.994508 | 162/162 | 0 | Success |
MTE is the primary ranking metric, with MRE used as the secondary metric. Both are computed over the upper and lower jaws of every evaluation case.
“Report” opens the team’s technical report, “Slides” the presentation deck shared for the STS 2026 winners’ session, and “Code” the team’s public repository. Greyed-out items were not released by the team.
Official results are published on the Codabench competition page. See the evaluation protocol for metric definitions and penalty values.