Reproducibility and reliability of three-dimensional soft tissue landmark identification using three-dimensional stereophotogrammetry

Baysal, Aslı; Şahan, Ahmet Oğuz; Öztürk, Mehmet Ali̇; Uysal, Tancan

doi:10.2319/120715-833.1

Cited by 36 publications

(21 citation statements)

References 12 publications

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“…These were all found to be consistently very high, both in relation to the 2 readings on each registration, and also as a result of when the 2 readings were combined for the first registration and compared to those of the second registration. In a study of reproducibility of soft tissue landmarks on facial images obtained from a stereophotogrammetry technique, intraclass correlation coefficients were found to be good for repeated readings by 2 examiners . Furthermore, in the present study paired t‐tests between the repeated readings showed no significant differences in all cases.…”

Section: Discussionsupporting

confidence: 50%

Volume Assessment of the Effect of Obturators on Facial Form Following Surgery for Head and Neck Cancer Using Stereophotogrammetry

Coward

Richards²,

Fenlon

et al. 2019

Journal of Prosthodontics

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Purpose To determine if stereophotogrammetry could be used to determine the effects of obturators on facial contour in relation to the measurement of facial volumes. Materials and Methods Stereophotogrammetry images were recorded from 20 subjects with and without their obturators in place. These were converted into a stereolithographic format and overlaid. Registrations were made using the tissues on the normal areas of the face. Difference images were created, enabling surface areas and volumes to be calculated. To assess repeatability of measurement, 2 readings were recorded on each of 2 separate registrations. Data analysis between the sets of readings used correlation coefficients and paired t‐tests. Coefficients of repeatability were also calculated. Results A comparison of readings for the surface areas showed the method of measurement was repeatable with no significant differences between the 2 repeated readings for registration 1 (p = 0.977, coefficient of repeatability = 101 mm2), registration 2 (p = 0.085, coefficient of repeatability = 106 mm2), and the mean of the two readings for registration 1 compared with registration 2 (p = 0.355, coefficient of repeatability = 103 mm2). Similar results were found for the volume measurements with no significant differences between the repeated readings for registration 1 (p = 0.862, coefficient of repeatability = 229 mm3), registration 2 (p = 0.200, coefficient of repeatability = 209 mm3), and the mean of the 2 readings for registration 1 compared with those for registration 2 (p = 0.131, coefficient of repeatability 339 mm3). There was a statistically significant range of volumes that appeared to have been restored by the obturators (p < 0.0005). Conclusions Stereophotogrammetry is reliable in assessing the effects of obturators on facial form. In the sample of subjects, obturators generally appeared to be effective in supporting facial tissues following surgical resections of the maxilla and therefore contribute in some degree to the restoration of facial appearance.

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Section: Discussionsupporting

confidence: 50%

Volume Assessment of the Effect of Obturators on Facial Form Following Surgery for Head and Neck Cancer Using Stereophotogrammetry

Coward

Richards²,

Fenlon

et al. 2019

Journal of Prosthodontics

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“…This system has previously demonstrated high accuracy, reliability and reproducibility 23 . Soft‐tissue landmarks used in three‐dimensional stereophotogrammetry and laser scanning are shown to have high reliability and moderate but clinically acceptable reproducibility, and the difference between the landmarks is less than 1 mm between repeated markings 24,25 …”

Section: Methodsmentioning

confidence: 99%

3D soft‐tissue evaluation of a Class III treatment with rapid maxillary expander and face mask in pre‐pubertal phase—A retrospective cohort study

Đokić

Zhurov²,

Richmond³

et al. 2020

Orthod Craniofacial Res

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Objectives: The aim of this prospective controlled study was to evaluate the effectiveness of the rapid maxillary expander (RME) and face mask treatment using threedimensional soft-tissue facial characteristics of pre-pubertal Class III children. Setting and Sample Population: CLIII and non-CLIII groups, both of 32 white children aged 6-8 years participated. Material and Methods: Facial surface images were obtained using stereophotogrammetry at T0 and T1 and were superimposed. Landmark-based and surface-based facial parameters were measured, and group differences were quantified (ANOVA; P ≥ .05). Results: CLIII children had less mid-face prominence, shorter lower facial height and protruded mandible when compared to non-CLIII children at T0. At T1, the differences between the groups were not statistically significant, indicating successful correction. After the RME/face mask treatment, the n-sn and sn-pg distances increased by 1.5 mm and 2.2 mm, respectively. The distance from sn to the n-pg line increased by 1 mm, the n-sn-pg angle decreased by almost 2°. Pogonion moved downward by 2.5 mm and posteriorly by 3 mm. The surface-based measurements between the groups after treatment showed anterior movement in the mid-face region and the upper lip region. The lower lip and chin region moved posteriorly in the CLIII group and anteriorly in the non-CLIII group. Conclusions: After RME/face mask treatment, the lower facial height increased, the maxilla moved anteriorly, and the mandible moved posteriorly. Consequently, CLIII children reached the respective values of the non-CLIII children, indicating a harmonious facial appearance of CLIII children. The results have been obtained using non-invasive technique.

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“…Many studies in the literature have shown that the 3dMD face system is the right tool for linear and surface measurements with potentially wide applications in orthodontics, surgical treatment planning, and treatment evaluation. In many studies, it has been reported that this system gives more accurate results in terms of reliability and reproducibility compared to direct anthropometric measurements and 2D facial photographs [19][20][21] .…”

mentioning

confidence: 99%

Comparison of three-dimensional soft-tissue evaluations between skeletal and pseudo-class III malocclusions

Kale

Büyükçavuş

2020

Sci Rep

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The aim of our study was to compare soft tissue measurements with 3D imaging methods in individuals with untreated skeletal and pseudo-Class III malocclusions. The study sample consisted of 75 patients (38 males, 37 females, mean age 12.41 ± 2.35 years) with pseudo- and true skeletal Class III malocclusions and skeletal Class I malocclusions. Soft tissue evaluations of all patients were performed using 3D stereophotogrammetric facial images. In our study, 26 landmarks, 17 linear measurements, 13 angular measurements, and 5 volume measurements were made using the 3dMD Vultus software. The significance was determined to be p < 0.05 in ANOVA, Tukey tests. No significant differences were found among the groups in terms of demographic data (p > 0.05). The skeletal Class I control group had a significantly more extended upper lip and vermillion length as compared to the Class III groups. The soft tissue convexity angle and upper nasal angle were found to be wider in the Class III malocclusion group compared to those in the Class I control group. While the pseudo-Class III group had a significantly lower midface volume, chin volume was significantly higher in the skeletal class group. Upper lip volume was significantly higher in the Class I group. Using 3dMD for guiding clinicians in the differential soft and hard tissue diagnosis of pseudo-Class III malocclusions, differences were revealed in Class I patients in the middle part of the face. In the differential diagnosis of true Class III malocclusions, chin volume was found to be different from that of Class I patients.

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Reproducibility and reliability of three-dimensional soft tissue landmark identification using three-dimensional stereophotogrammetry

Cited by 36 publications

References 12 publications

Volume Assessment of the Effect of Obturators on Facial Form Following Surgery for Head and Neck Cancer Using Stereophotogrammetry

Volume Assessment of the Effect of Obturators on Facial Form Following Surgery for Head and Neck Cancer Using Stereophotogrammetry

3D soft‐tissue evaluation of a Class III treatment with rapid maxillary expander and face mask in pre‐pubertal phase—A retrospective cohort study

Comparison of three-dimensional soft-tissue evaluations between skeletal and pseudo-class III malocclusions

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