Evaluation of reproducibility and reliability of 3D soft tissue analysis using 3D stereophotogrammetry.

In 3D photographs the bony structures are neither available nor palpable, therefore, the bone-related landmarks, such as the soft tissue gonion, need to be redefined. The purpose of this study was to determine the reproducibility and reliability of 49 soft tissue landmarks, including newly defined 3D bone-related soft tissue landmarks with the use of 3D stereophotogrammetric images. Two observers carried out soft-tissue analysis on 3D photographs twice for 20 patients. A reference frame and 49 landmarks were identified on each 3D photograph. Paired Student's t-test was used to test the reproducibility and Pearson's correlation coefficient to determine the reliability of the landmark identification. Intra- and interobserver reproducibility of the landmarks were high. The study showed a high reliability coefficient for intraobserver (0.97 (0.90 - 0.99)) and interobserver reliability (0.94 (0.69 - 0.99)). Identification of the landmarks in the midline was more precise than identification of the paired landmarks. In conclusion, the redefinition of bone-related soft tissue 3D landmarks in combination with the 3D photograph reference system resulted in an accurate and reliable 3D photograph based soft tissue analysis. This shows that hard tissue data are not needed to perform accurate soft tissue analysis.

[1]  P. Lines,et al.  Profilemetrics and facial esthetics. , 1978, American journal of orthodontics.

[2]  A F Ayoub,et al.  Applications of 3D Imaging in Orthodontics: Part II , 2004, Journal of orthodontics.

[3]  Kee-Joon Lee,et al.  A proposal for soft tissue landmarks for craniofacial analysis using 3-dimensional laser scan imaging. , 2006, World journal of orthodontics.

[4]  F C van Ginkel,et al.  Quantification of facial morphology using stereophotogrammetry--demonstration of a new concept. , 1996, Journal of dentistry.

[5]  K F Moos,et al.  Three-dimensional modeling for modern diagnosis and planning in maxillofacial surgery. , 1996, The International journal of adult orthodontics and orthognathic surgery.

[6]  G. W. Arnett,et al.  Facial keys to orthodontic diagnosis and treatment planning. Part I. , 1993, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[7]  J. L. Ackerman,et al.  Orthodontics about face: the re-emergence of the esthetic paradigm. , 2000, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[8]  Filip Schutyser,et al.  Three-dimensional cephalometry: spiral multi-slice vs cone-beam computed tomography. , 2006, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[9]  Joanne D. Subtelny,et al.  A longitudinal study of soft tissue facial structures and their profile characteristics, defined in relation to underlying skeletal structures , 1959 .

[10]  G. W. Arnett,et al.  Facial keys to orthodontic diagnosis and treatment planning--Part II. , 1993, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[11]  Filip Schutyser,et al.  Three-dimensional cephalometry : a color atlas and manual , 2006 .

[12]  Legan Hl,et al.  Soft tissue cephalometric analysis for orthognathic surgery , 1980 .

[13]  Chantal Malevez,et al.  Accuracy and reliability of 3-D CT versus 3-D stereo photogrammetry based facial soft tissue analysis , 2005 .

[14]  M W Vannier,et al.  Craniofacial measurements based on 3D-CT volume rendering: implications for clinical applications. , 2004, Dento maxillo facial radiology.

[15]  Paul Suetens,et al.  Registration of 3D Photographs with Spiral CT Images for Soft Tissue Simulation in Maxillofacial Surgery , 2001, MICCAI.

[16]  R A Holdaway,et al.  A soft-tissue cephalometric analysis and its use in orthodontic treatment planning. Part II. , 1983, American journal of orthodontics.

[17]  David M. Sarvera,et al.  Orthodontics about face: the re-emergence of the esthetic paradigm. , 2000 .

[18]  Cheol Lee,et al.  A three-dimensional analysis of soft and hard tissue changes after a mandibular setback surgery , 2006, Comput. Methods Programs Biomed..

[19]  V. Ferrario,et al.  Craniofacial growth: a three-dimensional soft-tissue study from 6 years to adulthood. , 1998, Journal of craniofacial genetics and developmental biology.

[20]  B. Holly Broadbent,et al.  A NEW X-RAY TECHNIQUE and ITS APPLICATION TO ORTHODONTIA , 2009 .

[21]  Tim Hutton,et al.  Reproducibility of soft tissue landmarks on three-dimensional facial scans. , 2006, European journal of orthodontics.

[22]  Mohammad Y Hajeer,et al.  Three-dimensional imaging in orthognathic surgery: the clinical application of a new method. , 2002, The International journal of adult orthodontics and orthognathic surgery.

[23]  D. Wertheim,et al.  Comparison of three methods of facial measurement. , 2007, International journal of oral and maxillofacial surgery.

[24]  Filip Schutyser,et al.  A New Method of 3-D Cephalometry Part I: The Anatomic Cartesian 3-D Reference System , 2006, The Journal of craniofacial surgery.

[25]  P. Mozzo,et al.  A new volumetric CT machine for dental imaging based on the cone-beam technique: preliminary results , 1998, European Radiology.

[26]  F Bookstein,et al.  Analysis of craniofacial asymmetry by multiplane cephalometry. , 1983, American journal of orthodontics.

[27]  Hyoung-Seon Baik,et al.  A proposal for a new analysis of craniofacial morphology by 3-dimensional computed tomography. , 2006, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[28]  A D Linney,et al.  A three-dimensional soft tissue analysis of 16 skeletal class III patients following bimaxillary surgery. , 1992, The British journal of oral & maxillofacial surgery.

[29]  S. Richmond,et al.  Reliability of measuring facial morphology with a 3-dimensional laser scanning system. , 2005, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.