Abstract
Dental preparations reduce a tooth to receive a crown, yet clinicians cannot easily verify how much structure was removed relative to the original tooth shape; aids such as a flexible resin slice only provide a two‑dimensional cross‑section of the original tooth geometry, particularly for hard‑access regions including interproximal areas and molar occlusal surfaces, which frequently leads to over‑reduction of teeth for safety considerations. This work investigates a multimodal fusion pipeline combining CBCT and intraoral scan (IOS) data to deliver a complete three‑dimensional view of the prepared tooth as well as its internal anatomy including the pulp. Teeth and pulp are segmented from CBCT at approximately one minute per scan, after which intraoral scans are also segmented and registered to these surfaces via our fully automated surface‑based registration method that rectifies the mirror‑image handedness inherent to scanner exports. Evaluated on 30 patients, the registration achieves a mean surface Dice of 0.63 with submillimetre surface distances (ASSD 0.26 mm, RMSD 0.29 mm). We further build an interactive open‑source tool for 3D visualization of fused outputs with transparency and overlap rendering alongside registration export functions, enabling clinicians to examine the pulp within the prepared tooth; facilitating the conservation of sound tooth substance, this solution proves especially beneficial for small teeth e.g., lower incisors, and our code is publicly accessible at https://github.com/ImaneChafi/Multi‑Vis‑Prep.
Links to Paper and Supplementary Materials
Main Paper (Open Access Version): https://papers.miccai.org/miccai-2026-sat/paper/MWM_001.pdf
SharedIt Link: Not yet available
SpringerLink (DOI): Not yet available
Supplementary Material: Not Submitted
Link to Open Review
Open Review Page: Not Available
BibTex
@InProceedings{ChaIma_Inside_MICCAISAT2026,
author = { Chafi, Imane AND Carrière, Victoria-Mae AND Elfassy, Lauren AND Cheriet, Farida AND Guibault, François},
title = { { Inside the Preparation: Multimodal CBCT–Intraoral Scan Fusion for Dental Preparations } },
booktitle = {Medical Image Computing and Computer Assisted Intervention -- MICCAI 2026 Workshops and Challenges},
year = {2026},
publisher = {Springer Nature Switzerland},
volume = {LNCS 17262},
month = {pending},
page = {pending}
}