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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/23758

Title: A new mandible-specific landmark reference system for three-dimensional cephalometry using cone-beam computed tomography
Authors: Pittayapat, Pisha
Jacobs, Reinhilde
Bornstein, Michael M.
Odri, Guillaume A.
Kwon, Min Sung
Lambrichts, Ivo
Willems, Guy
Politis, Constantinus
Olszewski, Raphael
Issue Date: 2016
Citation: EUROPEAN JOURNAL OF ORTHODONTICS, 38(6), p. 563-568
Abstract: Objectives: To develop a novel 3D landmark reference system that is specific for mandibular midline cephalometric landmarks and to assess its repeatability and reproducibility. Methods: Cone-beam computed tomography (CBCT) scans (3D Accuitomo (R) 170) were performed on 26 dry human skulls. The CBCT data were exported into DICOM files and imported to Maxilim (R) software to create 3D surface models. Two observers identified five landmarks to create a specific mid-sagittal mandibular plane: two mandibular foramina, two molar landmarks and one interincisive landmark. On this mid-sagittal mandibular plane, four mandibular cephalometric landmarks were marked: Point B, Pogonion, Gnathion and Menton. All observations were repeated by the two observers after an interval of 4 weeks. The coordinates (x, y, z) of each landmark were exported, and statistical analyses were performed to evaluate inter-and intra-rater precision. Results: The intra-observer median precision in locating all landmarks ranged between 0.17 and 0.61 mm. The intra-observer repeatability was generally good with a precision under 1 mm in more than 50 per cent. The overall median inter-observer precision was 0.26-2.30 mm. The mandibular foramina showed the best inter-observer reproducibility. The general inter-observer reproducibility was moderate to good, except for Pogonion and Point B. Limitations: Dry human skulls may not represent anatomical conditions found in living patients, thus the system should be validated using patients' data. Conclusion: The novel reference system offered good precision and generally good to moderate repeatability and reproducibility for mandibular midline cephalometric landmark identification in three dimensions. These findings will be useful for further improvement of 3D cephalometric systems.
Notes: [Pittayapat, Pisha; Jacobs, Reinhilde; Bornstein, Michael M.; Kwon, Min Sung; Politis, Constantinus] Univ Leuven, OMFS IMPATH Res Grp, Dept Imaging & Pathol, OIC,Fac Med, Kapucijnenvoer 33, B-3000 Leuven, Belgium. [Pittayapat, Pisha; Jacobs, Reinhilde; Bornstein, Michael M.; Kwon, Min Sung; Politis, Constantinus] Univ Hosp Leuven, Oral & Maxillofacial Surg, Kapucijnenvoer 33, B-3000 Leuven, Belgium. [Pittayapat, Pisha] Chulalongkorn Univ, Dept Radiol, Fac Dent, Bangkok, Thailand. [Bornstein, Michael M.] Univ Bern, Sch Dent Med, Dept Oral Surg & Stomatol, Bern, Switzerland. [Odri, Guillaume A.] Ctr Hosp Reg Orleans, Serv Chirurg Orthoped & Traumatol, Orleans 2, France. [Lambrichts, Ivo] Hasselt Univ, Biomed Res Inst, Lab Morphol, Campus Diepenbeek, Diepenbeek, Belgium. [Willems, Guy] Katholieke Univ Leuven, Orthodont, Dept Oral Hlth Sci, Leuven, Belgium. [Willems, Guy] Univ Leuven, Dent, Univ Hosp Leuven, Leuven, Belgium. [Olszewski, Raphael] Catholic Univ Louvain, Dept Oral & Maxillofacial Surg, Clin Univ St Luc, Brussels, Belgium.
URI: http://hdl.handle.net/1942/23758
DOI: 10.1093/ejo/cjv088
ISI #: 000393060000002
ISSN: 0141-5387
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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