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Planning of mandibular reconstructions based on statistical shape models

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International Journal of Computer Assisted Radiology and Surgery Aims and scope Submit manuscript

Abstract

Purpose

The reconstruction of large continuity defects of the mandible is a challenging task, especially when the shape of the missing part is not known prior to operation. Today, the surgical planning is based mainly on visual judgment and the individual skills and experience of the surgeons. The objective of the current study was to develop a computer-based method that is capable of proposing a reconstruction shape from a known residual mandible part.

Methods

The volumetric data derived from 60 CT scans of mandibles were used as the basis for the novel numerical procedure. To find a standardized representation of the mandible shapes, a mesh was elaborated that follows the course of anatomical structures with a specially developed topology of quadrilaterals. These standard meshes were transformed with defined mesh modifications toward each individual mandible surface to allow for further statistical evaluations. The data were used to capture the inter-individual shape variations that were considered as random field variations and mathematically evaluated with principal component analysis. With this information of the mandibular shape variations, an algorithm was developed that proposes shapes for reconstruction planning based on given residual mandible geometry parts.

Results

The accuracy of the novel method was evaluated on six different virtually defined continuity defects that were each created on three mandibles that were not part of the initial database. Virtual reconstructions showed sufficient accuracy of the algorithm for the planning of surgical reconstructions, with average deviations toward the actual geometry of \(1.82 \pm 0.11\) mm for small missing parts and 5 mm for large hemi-lateral defects.

Conclusions

The presented algorithm may be a valuable tool for the planning of mandibular reconstructions. The proposed shapes can be used as templates for computer-aided manufacturing, e.g., with 3D printing devices that use biocompatible materials.

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Acknowledgments

We acknowledge financial support of the present study by the German Federal Ministry of Education and Research (Grant No. 13GW0016C). Furthermore, the support of DYNARDO Austria GmbH for providing licenses of the software tools Statistics on Structures and optiSLang is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Dental Materials and Biomaterials Research, RWTH Aachen University Hospital, Pauwelsstr. 30, 52074, Aachen, Germany

    Stefan Raith, Michael Weber & Horst Fischer

  2. DYNARDO Austria GmbH, Wagenseilgasse 14, 1120, Vienna, Austria

    Sebastian Wolff

  3. Department of Oral and Maxillofacial Surgery, RWTH Aachen University Hospital, Pauwelsstr. 30, 52074, Aachen, Germany

    Timm Steiner, Ali Modabber & Frank Hölzle

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  1. Stefan Raith
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  2. Sebastian Wolff
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  3. Timm Steiner
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Correspondence to Stefan Raith.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards (Approval No. 2596/09, Technische Universität München, Germany).

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Raith, S., Wolff, S., Steiner, T. et al. Planning of mandibular reconstructions based on statistical shape models. Int J CARS 12, 99–112 (2017). https://doi.org/10.1007/s11548-016-1451-y

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