Three-dimensional analysis system for orthognathic surgery patients with jaw deformities

Terajima, Masahiko; Yanagita, Natsumi; Ozeki, Kanako; Hoshino, Yoshihiro; Mori, Noriko; Goto, Tazuko K.; Tokumori, Kenji; Aoki, Yoshimitsu; Nakasima, Akihiko

doi:10.1016/j.ajodo.2006.06.027

Cited by 42 publications

(25 citation statements)

References 16 publications

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“…27,28 Several authors have published the profile and frontal characteristics of the face by collecting the data via anthropometric measurements [6][7][8][9][10] or by using threedimensional imaging techniques. 15,19,23,25,32 The determination of the reliability of 2-dimensional photogrammetry for soft tissue evaluation might provide clinicians the ability to assess soft tissue from both profile and frontal views after orthodontic treatment.…”

Section: Discussionmentioning

confidence: 99%

Reliability of reference distances used in photogrammetry

Aksu¹,

Kaya²,

Kocadereli³

2010

The Angle Orthodontist

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Objective: To determine the reliability of the reference distances used for photogrammetric assessment. Materials and Methods: The sample consisted of 100 subjects with mean ages of 22.97 6 2.98 years. Five lateral and four frontal parameters were measured directly on the subjects' faces. For photogrammetric assessment, two reference distances for the profile view and three reference distances for the frontal view were established. Standardized photographs were taken and all the parameters that had been measured directly on the face were measured on the photographs. The reliability of the reference distances was checked by comparing direct and indirect values of the parameters obtained from the subjects' faces and photographs. Repeated measure analysis of variance (ANOVA) and Bland-Altman analyses were used for statistical assessment. Results: For profile measurements, the indirect values measured were statistically different from the direct values except for Sn-Sto in male subjects and Prn-Sn and Sn-Sto in female subjects. The indirect values of Prn-Sn and Sn-Sto were reliable in both sexes. The poorest results were obtained in the indirect values of the N-Sn parameter for female subjects and the Sn-Me parameter for male subjects according to the Sa-Sba reference distance. For frontal measurements, the indirect values were statistically different from the direct values in both sexes except for one in male subjects. The indirect values measured were not statistically different from the direct values for GoGo. The indirect values of Ch-Ch were reliable in male subjects. The poorest results were obtained according to the P-P reference distance. Conclusions: For profile assessment, the T-Ex reference distance was reliable for Prn-Sn and SnSto in both sexes. For frontal assessment, Ex-Ex and En-En reference distances were reliable for Ch-Ch in male subjects. (Angle Orthod. 2010;80:670-677.)

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Section: Discussionmentioning

confidence: 99%

Reliability of reference distances used in photogrammetry

Aksu¹,

Kaya²,

Kocadereli³

2010

The Angle Orthodontist

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“…Nowadays, superimposition of CBCT scans allows a three dimensional visualization of these effects. Similar to cephalometric tracings, 3D models constructed from CBCT scans could be superimposed manually by registering common stable landmarks or by best fit of stable anatomical regions [1], [2]. These two methods however depend on the accuracy of landmark definition and the precision of the 3D surface models.…”

Section: Introductionmentioning

confidence: 99%

Accuracy and Reproducibility of Voxel Based Superimposition of Cone Beam Computed Tomography Models on the Anterior Cranial Base and the Zygomatic Arches

et al. 2011

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Superimposition of serial Cone Beam Computed Tomography (CBCT) scans has become a valuable tool for three dimensional (3D) assessment of treatment effects and stability. Voxel based image registration is a newly developed semi-automated technique for superimposition and comparison of two CBCT scans. The accuracy and reproducibility of CBCT superimposition on the anterior cranial base or the zygomatic arches using voxel based image registration was tested in this study. 16 pairs of 3D CBCT models were constructed from pre and post treatment CBCT scans of 16 adult dysgnathic patients. Each pair was registered on the anterior cranial base three times and on the left zygomatic arch twice. Following each superimposition, the mean absolute distances between the 2 models were calculated at 4 regions: anterior cranial base, forehead, left and right zygomatic arches. The mean distances between the models ranged from 0.2 to 0.37 mm (SD 0.08–0.16) for the anterior cranial base registration and from 0.2 to 0.45 mm (SD 0.09–0.27) for the zygomatic arch registration. The mean differences between the two registration zones ranged between 0.12 to 0.19 mm at the 4 regions. Voxel based image registration on both zones could be considered as an accurate and a reproducible method for CBCT superimposition. The left zygomatic arch could be used as a stable structure for the superimposition of smaller field of view CBCT scans where the anterior cranial base is not visible.

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“…Orthodontics, craniofacial surgery, and anthropometry focus on the detailed structural characteristics of maxillofacial deformities using various methods including the analyses of Delaire et al., Burstone et al., and Sassouni (1–3). Recent advances in three‐dimensional (3D) visualization technology that combine computer graphics and digital imaging have improved analysis and treatment planning (4–6). Furthermore, the transformation of two‐dimensional (2D) cephalometric analyses into 3D analyses has been validated showing that the difficulties were mainly related to the transposition of the reference points used in the analysis (7).…”

Section: Introductionmentioning

confidence: 99%