Reliability of a 3D surface laser scanner for orthodontic applications

Kusnoto, Budi; Evans, Carla A.

doi:10.1067/mod.2002.128219

Cited by 181 publications

(120 citation statements)

References 4 publications

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“…However, patients usually evaluate their own soft tissue esthetics on the basis of how they look in a frontal view. Therefore, three-dimensional (3D) imaging methods, such as 3D computed tomography [3][4][5][6] and 3D facial scan images (3D-FSIs), [7][8][9][10][11][12] are used to analyze and evaluate the soft tissues of the entire face.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Lim¹,

Chu²,

Lee³

et al. 2010

The Angle Orthodontist

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Objective: To evaluate whether mandibular setback surgery (MSS) for Class III patients would produce gradients of three-dimensional (3D) soft tissue changes in the vertical and transverse aspects. Materials and Methods: The samples consisted of 26 Class III patients treated with MSS using bilateral sagittal split ramus osteotomy. Lateral cephalograms and 3D facial scan images were taken before and 6 months after MSS, and changes in landmarks and variables were measured using a Rapidform 2006. Paired and independent t-tests were performed for statistical analysis. Results: Landmarks in the upper lip and mouth corner (cheilion, Ch) moved backward and downward (respectively, cupid bow point, 1.0 mm and 0.3 mm, P , .001 and P , .01; alar curvature-Ch midpoint, 0.6 mm and 0.3 mm, both P , .001; Ch, 3.4 mm and 0.8 mm, both P , .001). However, landmarks in stomion (Stm), lower lip, and chin moved backward (Stm, 1.6 mm; labrale inferius [Li], 6.9 mm; LLBP, 6.9 mm; B9, 6.7 mm; Pog9, 6.7 mm; Me9, 6.6 mm; P , .001, respectively). Width and height of upper and lower lip were not altered significantly except for a decrease of lower vermilion height (Stm-Li, 1.7 mm, P , .001). Chin height (B9-Me9) was decreased because of backward and upward movement of Me9 (3.1 mm, P , .001). Although upper lip projection angle and Stm-transverse projection angle became acute (Ch Rt -Ls-Ch Lt , 5.7u; Ch Rt -Stm-Ch Lt , 6.4u, both P , .001) because of the greater backward movement of Ch than Stm, lower lip projection angle and Stm-vertical projection angle became obtuse (Ch Rt -Li-Ch Lt , 10.8u; LsStm-Li, 23.5u, both P , .001) because of the larger backward movement of Li than labrale superius (Ls). Conclusions: Three-dimensional soft tissue changes in Class III patients after MSS exhibited increased gradients from upper lip and lower lip to chin as well as from Stm to Ch. (Angle Orthod. 2010;80:896-903.)

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Section: Introductionmentioning

confidence: 99%

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Lim¹,

Chu²,

Lee³

et al. 2010

The Angle Orthodontist

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“…Modern computerised stereophotogrammetry is based on the acquisition of two stereoscopic views; the algorithm identifies common points from each of these two images and then uses the concept of multiple point geometric triangulation to determine the surface coordinates of the target object (Kusnoto and Evans, 2002).…”

Section: Photogrammetrymentioning

confidence: 99%

“…Laser technology utilises optical principles and essentially is a stereoscopic technique in which the distance and morphology of the object is calculated by computer software using a laser source and CCD detector (Kusnoto and Evans, 2002;Kau et al, 2007).…”

Section: Lasersmentioning

confidence: 99%

The Validity of 3dMD Vultus in Predicting Soft Tissue Morphology Following Orthognathic Surgery

Ullah

Turner

Khambay

2014

British Journal of Oral and Maxillofacial Surgery

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Objectives:To determine the validity of 3dMD Vultus in predicting soft tissue morphology following orthognathic surgery. Methods:Thirteen patients with a skeletal discrepancy that required surgical correction limited to a Le Fort I surgical advancement osteotomy were included within the study. These patients had previously undergone a CBCT scan immediately before surgery (T1) and 6 months after surgery (T2).To permit validation, hard and soft tissues were linked for each time point and the hard tissues superimposed on the cranial vault and base. Using 3dMD Vultus virtual surgery was carried out to position the mandible and maxilla at T1 to the post-surgical position at T2. The resulting 3D soft tissue prediction mesh was then compared to the actual soft tissue mesh at T2 by segmenting both meshes at distinct anatomically areas of the face. The absolute distance between meshes for each region was then calculated using a custom developed computer program.

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“…Numerous accuracy studies have been conducted on different laser scanners with regard to the accuracy from three-dimensional capture of faces of the resulting scan measurements when compared with anthropometric measurements from the face [52,[60][61][62]. These studies all found that laser scanners are a reliable and fast means of capturing a three-dimensional reproduction of a facial surface whilst maintaining high levels of accuracy with regard to the difference in resulting measurements between the scan and the subject.…”

Section: Introductionmentioning

confidence: 99%

The use of craniofacial superimposition for disaster victim identification

Wilkinson

Lofthouse

2015

Forensic Science International

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Skull-to-face comparison is utilised for human identification where there is a suspected identity and the usual methods of identification, such as DNA or dental comparison, are not possible or practical. This research aimed to accurately compare manual and computerised craniofacial superimposition techniques and to establish the application of these techniques for disaster victim identification, where there may be a large database of passport-style images, such as the MPUB Interpol database. Twenty skulls (10 female; 10 male) were utilised from the William Bass Skeletal Collection at the University of Tennessee and compared to face pools of 20 face photographs of similar sex, age and ethnic group. A traditional manual photographic method and a new 3D computer-based method were studied. The results suggested that profile and three-quarter views of the ante-mortem face were the most valuable for craniofacial superimposition. However, the poor identification rate achieved using images in frontal view suggests that the MPUB Interpol database would not be optimal for disaster victim identification, and passport-style images do not provide enough distinguishing facial detail. This suggests that multiple ante-mortem images with a variety of facial expression should be utilised for identification purposes. There was no significant difference in success between the manual and computer methods.

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Reliability of a 3D surface laser scanner for orthodontic applications

Cited by 181 publications

References 4 publications

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

The Validity of 3dMD Vultus in Predicting Soft Tissue Morphology Following Orthognathic Surgery

The use of craniofacial superimposition for disaster victim identification

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