The Reliability of Facial Soft Tissue Landmarks with Photogrammetry PDF Download
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Author: Michael G. Payne
Publisher:
ISBN:
Category : Dental photography
Languages : en
Pages :
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Book Description
Introduction:With attention being given to the deleterious effects of radiation exposure from dental radiographs and inaccuracies in cephalometric soft tissue measurements, an alternative method of facial analysis with sufficiently reliable soft tissue landmarks should be developed. The goals of this study were threefold: (1) to define a new, low-cost method for capturing standardized frontal and sagittal facial images, (2) to determine on which photographic view that landmarks can be more reliably located, and (3) to determine which landmarks are appropriate for quantitative facial analysis. Materials and Methods:Simultaneous frontal and right sagittal facial images of 10 male and 10 female dental student subjects were captured using high-definition webcams as part of a low-cost set-up. Seventeen identical predefined facial soft tissue landmarks were located by 5 examiners on both types of images and were recorded as coordinate values. These coordinate values were used to calculate the best estimate of the true value for each landmark, mean deviation from this best estimate, and reliability in the X- and Y-axes using the Shrout-Fleiss intraclass correlation coefficient with corresponding 95% confidence intervals. Two examiners repeated the landmark location to evaluate intra-examiner reliability. Results:With a 95% confidence interval range of>0.950, nose and mouth landmarks were among the most reliable landmarks on frontal and sagittal facial images. Converselyright soft tissue gonionwas one of the least reliable landmarks located in this study. In general, landmarks located by a single examiner showed greater reliability than when there were multiple examiners. Conclusions:This low-cost method yielded frontal and sagittal images sufficient for landmark identification. The magnitude of error varies between landmarks, is largest for poorly demarcated landmarks, and most had a non-circular envelope of error. Certain landmarks were more reliable on sagittal images and others were more reliable on frontal images. All landmarks had greater reliability and less mean deviation when located by a single examiner.
Author: Michael G. Payne
Publisher:
ISBN:
Category : Dental photography
Languages : en
Pages :
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Book Description
Introduction:With attention being given to the deleterious effects of radiation exposure from dental radiographs and inaccuracies in cephalometric soft tissue measurements, an alternative method of facial analysis with sufficiently reliable soft tissue landmarks should be developed. The goals of this study were threefold: (1) to define a new, low-cost method for capturing standardized frontal and sagittal facial images, (2) to determine on which photographic view that landmarks can be more reliably located, and (3) to determine which landmarks are appropriate for quantitative facial analysis. Materials and Methods:Simultaneous frontal and right sagittal facial images of 10 male and 10 female dental student subjects were captured using high-definition webcams as part of a low-cost set-up. Seventeen identical predefined facial soft tissue landmarks were located by 5 examiners on both types of images and were recorded as coordinate values. These coordinate values were used to calculate the best estimate of the true value for each landmark, mean deviation from this best estimate, and reliability in the X- and Y-axes using the Shrout-Fleiss intraclass correlation coefficient with corresponding 95% confidence intervals. Two examiners repeated the landmark location to evaluate intra-examiner reliability. Results:With a 95% confidence interval range of>0.950, nose and mouth landmarks were among the most reliable landmarks on frontal and sagittal facial images. Converselyright soft tissue gonionwas one of the least reliable landmarks located in this study. In general, landmarks located by a single examiner showed greater reliability than when there were multiple examiners. Conclusions:This low-cost method yielded frontal and sagittal images sufficient for landmark identification. The magnitude of error varies between landmarks, is largest for poorly demarcated landmarks, and most had a non-circular envelope of error. Certain landmarks were more reliable on sagittal images and others were more reliable on frontal images. All landmarks had greater reliability and less mean deviation when located by a single examiner.
Author: Dana R. Mohammed
Publisher: Anchor Academic Publishing
ISBN: 3960677022
Category : Medical
Languages : en
Pages : 141
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Book Description
The first sign of facial beauty was displayed in Egyptian civilization art works as they started to understand the divine or golden proportion that was known as a golden ratio which could be defined as the ratio that considered to be the most aesthetically pleasing to the human’s eye and the base of countless mysteries over centuries. In the past, the cephalometic analysis represented an important tool in planning an orthodontic treatment, but today, the focus is mainly on the facial soft tissue and the dental assessment by using photographs. Despite most of the orthodontists are focused primarily on the occlusal discrepancies and mal-relations when discussing the needs of orthodontic treatment with the patients, and the patients and parents are focused mainly on the appearance, the orthodontic diagnosis and treatment planning should have a broader extent, include the occlusion, tooth shape and appearance of the face to have both excellent occlusion and excellent aesthetics, although this is quite difficult, but it is the goal that all orthodontists should pursue. This book represents a master thesis in orthodontics from the College of Dentistry-University of Baghdad/Iraq. The uniqueness of this work comes from that it is the first one that analyses the micro-aesthetic appearance to establish normative values for the Iraqi population and find out whether there is a correlation between apparent mesiodistal measurements of maxillary anterior teeth and facial measurements by an indirect method of measurement, using photographs in a sample of Iraqi population.
Author: Yasir M. Kachroo
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
Objective: Three-dimensional (3D) soft tissue (ST) changes from orthodontic treatment can now be evaluated with the development of 3D photography. However, the accuracy and reliability of this method is still in question. This study aims to 1) evaluate the accuracy of 3dMD imaging using caliper, surface, and 3D morphometrics and 2) find standard facial expressions that can be best reproduced by 3dMD imaging for soft tissue analysis. Methods: Three-dimensional (3D) ST facial landmarks were obtained from 40 adults not undergoing orthodontic treatment through the use of 3dMD facial photographic software. A total of 16 landmarks were used and 21 parameters were measured for surface distances (6 in vertical, 10 in anterior posterior, and 5 in transverse). 3dMD images of four different facial expressions (repose (R), maximum intercuspation (MIP), posed smile (S), and smile with lips closed (SLC)) were taken at 0hr, 1hr, 24hr, 1wk, 2wk, 3wk, and 4wk time intervals. As a feasibility test, these measurements were taken on a mannequin at the above time intervals. Superimposition of seven 3dMD images for each facial posture per subject was performed for analysis. Error magnitude statistics: mean absolute difference (MAD), standard deviation of the error (SD), Root MeanSquare Error (RMSE), relative error magnitude (REM), technical error magnitude (TEM), and intraclass correlation coefficient (ICC) were used.3D morphometrics, seven images were taken of mannequin and subjects posing in MIP and posed smile. These images were loaded into an initial software pipeline to generate a closed mesh. Closed mesh were traced for surface curves and finally loaded into a dual pipeline to average those seven images. Color-coded displacement maps were generated from the dual pipeline images to evaluate changes across the seven time points. T-stats was performed to quantify these changes. Results: Measurements on a mannequin confirmed the reliability of all the landmarks and parameters used in this study. For 40 subjects, 3dMD measurements between ST landmarks were reproducible with a random error lower than 1mm except for the distance from cheilion to cheilion (2.79mm). Comparing across the four facial postures, MIP showed the smallest variation with mean absolute difference (MAD) (2.03mm) and SD (0.81mm). S posture had the largest variation with MAD (2.79mm) and SD (1.28mm). For 3D morphometrics, mannequin showed that the t-stats are at near zero on the face. When applying 3D morphometrics for MIP and posed smile, areas around exocanthion, cheilion, and pronasale showed slight variation. Conclusion: 3dMD can perform ST analysis with both accuracy and reproducibility and can be utilized for evaluating ST changes with dental treatment when using advanced technology like 3D morphometrics. Cheilion, alar base, and exocanthion might not be an appropriate landmark to use for ST analysis. R and MIP facial postures are recommended over smile (S or SLC) for more consistent parameter measurements.
Author: Victor R. Preedy
Publisher: Springer Science & Business Media
ISBN: 1441917888
Category : Medical
Languages : en
Pages : 3042
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Book Description
Although its underlying concept is a relatively simple one—the measurement of the human body and its parts—anthropometry employs a myriad of methods and instruments, and is useful for a variety of purposes, from understanding the impact of disease on individuals to tracking changes in populations over time. The first interdisciplinary reference on the subject, the Handbook of Anthropometry brings this wide-ranging field together: basic theory and highly specialized topics in normal and abnormal anthropometry in terms of health, disease prevention, and intervention. Over 140 self-contained chapters cover up-to-date indices, the latest studies on computerized methods, shape-capturing systems, and bioelectrical impedance, data concerning single tissues and whole-body variables, and reports from different areas of the world. Chapters feature helpful charts and illustrations, cross-references to related chapters are included, and key points are presented in bullet form for ease of comprehension. Together, the Handbook’s thirteen sections entail all major aspects of anthropometrical practice and research, including: Tools and techniques. Developmental stages, from fetus to elder. Genetic diseases, metabolic diseases, and cancer. Exercise and nutrition. Ethnic, cultural, and geographic populations. Special conditions and circumstances. The Handbook of Anthropometry is an invaluable addition to the reference libraries of a broad spectrum of health professionals, among them health scientists, physicians, physiologists, nutritionists, dieticians, nurses, public health researchers, epidemiologists, exercise physiologists, and physical therapists. It is also useful to college-level students and faculty in the health disciplines, as well as to policymakers and ergonomists.
Author: Noyan Aynechi
Publisher:
ISBN:
Category : Face
Languages : en
Pages : 142
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Book Description
Author: Michael Brenner
Publisher: BoD – Books on Demand
ISBN: 9533078499
Category : Medical
Languages : en
Pages : 162
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Book Description
Rhinoplasty is one of the defining procedures of plastic and reconstructive surgery. Its roots stem from early efforts in nasal reconstruction to the emergence of modern rhinoplasty. This book describes the latest clinical and research perspectives in rhinoplasty and balances structural correction with aesthetic refinement. With treatises on rhinoplasty from a diverse set of thought leaders from around the world, the collective experience of this books' authors cover cosmetic and reconstructive approaches with a wealth of proven and innovative approaches ranging from minor refinement to major reconstruction. This diversity reflects the inherent complexity of the art and science of rhinoplasty. Discussion of structural approaches is balanced by consideration of judicious resection and refinement. The overarching goal is to instill an understanding of the subtleties of nasal structure and how the natural complexities of nasal anatomy can be adapted to maximize both function and natural appearance.
Author: Nadim Z. Baba
Publisher: John Wiley & Sons
ISBN: 1119274575
Category : Medical
Languages : en
Pages : 292
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Book Description
Journal of Prosthodontics on Complex Restorations compiles 34 of the journal’s best articles discussing complex restorative dental challenges, collecting notable works on the subject. Presents a curated list of the best peer-reviewed articles on complex restorations from the pages of Journal of Prosthodontics Covers management of maxillofacial defects using CAD/CAM technology, tooth wear, congenital disorders, orthodontic/prosthodontic patients, patients with surgical and maxillofacial challenges, and completely edentulous patients using new ceramic material Offers a mix of clinical reports, research articles, and reviews
Author: John Pallanch
Publisher: Elsevier Health Sciences
ISBN: 1455712574
Category : Medical
Languages : en
Pages : 239
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Book Description
A global pool of surgeons and researchers using 3-dimensional imaging for facial plastic surgery present topics on: Image fusion in pre-operative planning; The use of 3D imaging tools including stereolithographic modeling and intraoperative navigation for maxillo-mandibular and complex orbital reconstruction; Custom-made, three-dimensional, intraoperative surgical guides for nasal reconstruction; The benefits and limits of using an integrated 3D virtual approach for maxillofacial surgery; 3D volume assessment techniques and computer-aided design and manufacturing for pre-operative fabrication of implants in head and neck reconstruction; A comparison of different new 3D imaging technologies in facial plastic surgery; 3-D photography in the objective analysis of volume augmentation including fat augmentation and dermal fillers; Assessment of different rhinoplasty techniques by overlay of before and after 3D images; 3D volumetric analysis of combined facial lifting and volumizing (volume enhancement); 3-D facial measurements and perceptions of attractiveness; Teaching 3-D sculpting to Facial Plastic Surgeons, 3-D insights on aesthetics; Creation of the virtual patient for the study of facial morphology; 3-dimensional video analysis of facial movement; 3D modeling of the behavior of facial soft tissues for understanding facial plastic surgery interventions.
Author: J. N. Reddy
Publisher: CRC Press
ISBN: 0203859472
Category : Technology & Engineering
Languages : en
Pages : 748
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Book Description
Essential reading on the latest advances in virtual prototyping and rapid manufacturing. Includes 110 peer reviewed papers covering: 1. Biomanufacturing, 2. CAD and 3D data acquisition technologies, 3. Materials, 4. Rapid tooling and manufacturing, 5. Advanced rapid prototyping technologies and nanofabrication, 6. Virtual environments and
Author: Mona Duggal
Publisher: Frontiers Media SA
ISBN: 2832514936
Category : Medical
Languages : en
Pages : 119
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