Alloplastic Facial Implants

2021 ◽  
Author(s):  
Tsung-yen Hsieh ◽  
Karan Dhir ◽  
William J. Binder ◽  
Peter Andrew Hilger
Keyword(s):  
Computer Aided Design ◽  
Aging Process ◽  
Soft Tissues ◽  
Patient Specific ◽  
Advantages And Disadvantages ◽  
Alloplastic Implants ◽  
Wide Range ◽  
Facial Plastic ◽  
The Face ◽  
Facial Augmentation

AbstractAs the face ages, there is thinning of the epidermis, volume loss and rearrangement of the soft tissues, and malabsorption of the skeletal framework. It is essential to have a thorough understanding of the aging process for successful facial augmentation and rejuvenation. Alloplastic implants can be used to provide a long-lasting solution for augmentation of skeletal deficiencies, restoration of facial irregularities, and rejuvenation of the face. In this study, we describe the ideal implant characteristics along with the advantages and disadvantages of various implant materials. We also present techniques in nasal and premaxillary augmentation, midface augmentation, mandibular augmentation, and lip augmentation. Additionally, computer-aided design and manufacturing as well as bioprinting are emerging technologies with growing applications in facial plastic and reconstructive surgery. We discuss their role in the creation of patient-specific custom implants. The overall goal of facial rejuvenation is to address multiple aspects of the facial aging process including deficiencies in the skin, soft tissues, and skeletal framework. The use of alloplastic implants alone or synergistically with additional surgical procedures can restore a wide range of anatomical deficits that occur with age.

3D Printing & Pharmaceutical Manufacturing: Opportunities and Challenges

2016 ◽  
Vol 5 (01) ◽  
pp. 4723 ◽  
Author(s):  
Bhusnure O. G.* ◽  
Gholve V. S. ◽  
Sugave B. K. ◽  
Dongre R. C. ◽  
Gore S. A. ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Tissue Engineering ◽  
3D Printing ◽  
Computer Aided Design ◽  
Patient Specific ◽  
Computer Design ◽  
3D Scaffolds ◽  
Engineering Research ◽  
Advantages And Disadvantages ◽  
Computer Aided

Many researchers have attempted to use computer-aided design (C.A.D) and computer-aided manufacturing (CAM) to realize a scaffold that provides a three-dimensional (3D) environment for regeneration of tissues and organs. As a result, several 3D printing technologies, including stereolithography, deposition modeling, inkjet-based printing and selective laser sintering have been developed. Because these 3D printing technologies use computers for design and fabrication, and they can fabricate 3D scaffolds as designed; as a consequence, they can be standardized. Growth of target tissues and organs requires the presence of appropriate growth factors, so fabrication of 3Dscaffold systems that release these biomolecules has been explored. A drug delivery system (D.D.S) that administrates a pharmaceutical compound to achieve a therapeutic effect in cells, animals and humans is a key technology that delivers biomolecules without side effects caused by excessive doses. 3D printing technologies and D. D. Ss have been assembled successfully, so new possibilities for improved tissue regeneration have been suggested. If the interaction between cells and scaffold system with biomolecules can be understood and controlled, and if an optimal 3D tissue regenerating environment is realized, 3D printing technologies will become an important aspect of tissue engineering research in the near future. 3D Printing promises to produce complex biomedical devices according to computer design using patient-specific anatomical data. Since its initial use as pre-surgical visualization models and tooling molds, 3D Printing has slowly evolved to create one-of-a-kind devices, implants, scaffolds for tissue engineering, diagnostic platforms, and drug delivery systems. Fuelled by the recent explosion in public interest and access to affordable printers, there is renewed interest to combine stem cells with custom 3D scaffolds for personalized regenerative medicine. Before 3D Printing can be used routinely for the regeneration of complex tissues (e.g. bone, cartilage, muscles, vessels, nerves in the craniomaxillofacial complex), and complex organs with intricate 3D microarchitecture (e.g. liver, lymphoid organs), several technological limitations must be addressed. Until recently, tablet designs had been restricted to the relatively small number of shapes that are easily achievable using traditional manufacturing methods. As 3D printing capabilities develop further, safety and regulatory concerns are addressed and the cost of the technology falls, contract manufacturers and pharmaceutical companies that experiment with these 3D printing innovations are likely to gain a competitive edge. This review compose the basics, types & techniques used, advantages and disadvantages of 3D printing

scholarly journals A comparative analysis of the application of piezoelectric surgery and mechanical osteoperforation techniques in modeling an orbital decompression

2018 ◽  
Vol 11 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Konstantin A Konovalov ◽  
Dmitriy V Davydov ◽  
Vitaliy Yu Roshchin
Keyword(s):  
Comparative Analysis ◽  
Diode Laser ◽  
Soft Tissues ◽  
Orbital Decompression ◽  
Surgical Equipment ◽  
Ultrasonic Scalpel ◽  
Advantages And Disadvantages ◽  
Bone Window ◽  
Piezoelectric Surgery ◽  
Wide Range

Currently a wide range of instruments for surgical procedures on the bony structures of the orbits is offered. Each of them has its advantages and disadvantages. Cutter causes less injury, in comparison with a chisel or an ultrasonic saw [15]. In using a drill during surgery there was an increase in temperature of bone edge of the opening above acceptable values [17]. The use of low frequency ultrasonic tools allows you to create holes in the bones of any desired size and shape with smooth edges [5, 11, 16, 20]. The disadvantages of this method include the heating of tool’s tip up to 140° during prolonged continuous action [6]. Thus, techniques using tools for formation of the bone window require further study and improvement. Aim: to compare surgical equipment for bone window formation in modeling an orbital decompression. Materials and methods. In an experimental study in vivo, 12 surgical interventions on the scapula on both sides were performed in 6 Chinchilla breed rabbits. On the right side, the formation of a bone window was carried out by the ultrasonic bone scalpel MISONIX, on the left side - by a drill. Results. It was found that during first 7-21 days there was more pronounced inflammation of soft tissues on the left side. At the same time, delayed proliferation and maturation of fibrous connective tissue was observed in comparison to the opposite side. Bone tissue inflammation and subsequent regeneration took place without significant differences on both sides. The experiment showed that the use of ultrasonic scalpel in flat bones creates less inflammation of surrounding tissues and the bone itself as compared to a diode laser. A.V. Kravchenko (2006) reports that, after exposure to a diode laser in an acute experiment there was a scalloped edge with an area of photocarbonization (charring) on the 7th and the 21st day; while the use of an ultrasonic scalpel did not create any signs of infiltrative inflammation, later on a nonspecific inflammation developed. Conclusion. Ultrasonic scalpel has a number of advantages when performing osteoperforation, such as time-saving during surgical procedure, control of the osteotomy process, less trauma to surrounding tissues during action and less pronounced inflammatory response of the wound during early postoperative period. (For citation: Konovalov KA, Davydov DV, Roshchin VY. A comparative analysis of the application of piezoelectric surgery and mechanical osteoperforation techniques in modeling an orbital decompression. Ophthalmology Journal. 2018;11(1):10-18. doi: 10.17816/OV11110-18).

CAD and Optimization of Spur and Helical Gear Sets

1996 ◽  
Author(s):  
Sayed M. Metwalli ◽  
Ehab A. El Danaf
Keyword(s):  
Computer Aided Design ◽  
Full Range ◽  
Optimization Techniques ◽  
Design Stage ◽  
Helical Gears ◽  
Face Width ◽  
Optimum Parameters ◽  
Number Of Teeth ◽  
Wide Range ◽  
The Face

Abstract The present work is an application of Computer Aided Design and optimization techniques to solve the problem of designing a pair of gears. The CAD programs have the initial freedom to change the design variables: the module, the number of teeth, the face width, and the material through a data base display, and a full detailed design stage that applies the AGMA bending and contact number checking criteria, and the bending fatigue strength and the surface endurance strength criteria. Other programs are also linked to optimize spur gears under the objective of minimizing the volume. The design vector is taken to be the module, the number of teeth, and the face width, with the interaction between bending and contact stress constraints. These programs were utilized to study the behavior of the optimum parameters for a full range of cases. Charts of the optimum results are plotted. For optimizing helical gears, the design vector is taken as the module, the number of teeth, the face width, and the helix angle. A comparison is made between values of the objective function and optimum parameters for spur and helical gears for a wide range of cases. A comparison is also made of the results with other previous works of optimization and proved that the approach presented here gives better optimum results for the same loading case.

Changing Mandible Contour Using Computer Designed/Computer Manufactured (CAD/CAM) Alloplastic Implants

2021 ◽  
Author(s):  
David M Straughan ◽  
Michael J Yaremchuk
Keyword(s):  
Sexual Dimorphism ◽  
Computer Aided Design ◽  
Senior Author ◽  
Implant Removal ◽  
Patient Dissatisfaction ◽  
Alloplastic Implants ◽  
Computer Aided ◽  
The Face ◽  
Cad Cam ◽  
Aided Design

Abstract Background The shape of the mandible is the fundamental determinant of the appearance and sexual dimorphism of the lower third of the face. The use of computer-aided design/computer-aided manufactured (CAD/CAM) alloplastic implants provide unparalleled planning and sophistication in the correction of skeletal deficiencies, irregularities and asymmetry. Objectives This study presents the rationale, indications, techniques, and results of the senior author’s (MJY) 15-year experience using CAD/CAM alloplastic implants to correct deficiencies and asymmetries of the mandible. Methods A retrospective review of a prospectively maintained database was reviewed of all patients who underwent aesthetic augmentation of the mandible using CAD/CAM alloplastic implants by the senior author. Results Over a 15-year period, 123 patients underwent mandibular augmentation using CAD/CAM alloplastic implants. The majority of patients were men (76.4%) with an average age of 31 years (24-63 years). All implants were bilateral. Complications included infection requiring implant removal (2.4%) and patient dissatisfaction resulting in either implant revision (4.1%) or implant removal (2.4%). Conclusions As described here, CAD/CAM alloplastic implants are an effective modality to augment aesthetic mandible contour deficiencies.

The Superficial Musculoaponeurotic System Facelift: A Prudent Balance of Risks and Benefits

2017 ◽  
Vol 33 (03) ◽  
pp. 260-265 ◽  
Author(s):  
E. McCollough
Keyword(s):  
Common Sense ◽  
Aging Process ◽  
Facial Plastic Surgery ◽  
Risks And Benefits ◽  
Superficial Musculoaponeurotic System ◽  
Facial Plastic ◽  
The Face ◽  
History Of ◽  
Invasive Techniques ◽  
Excessive Skin

AbstractOver the decades, facelifting has not escaped the natural history of trends and fads. And, as a profession, facial plastic surgery has not avoided falling into the trap of following corporate initiated technology, rather than leading common-sense methodologies to rejuvenating the aging face. The author is often reminded of a truism to which he was introduced in the 1980s. “When there are many ways of doing things, all of them work; or none of them work.” Undeniably, any procedure that lifts and removes excessive skin of the face and neck “works.” However, the questions that must be answered by leading teachers of facelifting surgery are: How well does a given technique work? How long-lasting are the results? Where does the risk–benefit curve cross over from optimal benefits to unacceptable risks? At what stage in a given patient's aging process are more aggressive techniques called for? At what stage in a surgeon's career should more invasive techniques be attempted, if ever? This article addresses the preceding questions as they relate to the contribution made by the superficial musculoaponeurotic fascia in repositioning sagging tissues of the face and neck.

scholarly journals Reshaping the Lower Face Using Injectable Fillers

2020 ◽  
Vol 53 (02) ◽  
pp. 207-218
Author(s):  
André Braz ◽  
Camila Cazerta de Paula Eduardo
Keyword(s):  
Aging Process ◽  
Soft Tissues ◽  
Treatment Plan ◽  
Young Patients ◽  
Facial Shape ◽  
The Face ◽  
Facial Proportions ◽  
Facial Anatomy ◽  
The Aesthetic ◽  
Injectable Fillers

AbstractThe lower third is very important for the pleasant appearance of the face. A well-contoured jawline is desirable in men and women, giving a perception of beauty and youth. It is also key to sexual dimorphism, defining masculine and feminine characteristics. The nonsurgical rejuvenation and beautification of the lower third of the face is becoming more frequent. Injectable fillers can reshape the jawline, lift soft tissues, and improve facial proportions, effectively improving the appearance of the area.It is paramount to understand the facial anatomy and perform a good facial assessment in order to propose a proper aesthetic treatment plan. The aesthetic goal of the rejuvenation approach is to redefine the mandibular angle and line. In young patients, beautification can be achieved through correction of constitutional deficit or enhancement of the contour of the face, improving the facial shape. It is very important to possess knowledge of facial anatomy and of the aging process in order to deliver effective and safe results.In this article, we discuss the anatomy of the lower third of the face, facial assessment, aging process, and treatments of the chin, prejowls and mandibular line and angle with injectable fillers. The authors’ experience in the approach of this area is discussed.

Laser milling

2002 ◽  
Vol 216 (5) ◽  
pp. 657-667 ◽  
Author(s):  
D T Pham ◽  
S S Dimov ◽  
P V Petkov ◽  
S P Petkov
Keyword(s):  
Computer Aided Design ◽  
Nickel Alloys ◽  
Three Dimensional ◽  
Hardened Steel ◽  
Advantages And Disadvantages ◽  
Laser Milling ◽  
Wide Range ◽  
Aided Design ◽  
Physical Phenomena ◽  
Complex Parts

Laser milling is a new manufacturing process that has attracted much attention from engineers and researchers for the last decade. The process allows complex parts and tooling inserts to be fabricated directly from three-dimensional computer aided design (CAD) data in a wide range of advanced engineering materials such as ceramics, hardened steel, titanium and nickel alloys. The paper starts with a description of the physical phenomena underlying the process and the factors influencing its performance. It then outlines the machining techniques that can be utilized in laser milling. The paper concludes with a discussion of the advantages and disadvantages of the process and a summary of its application areas.

scholarly journals Treatment Modalities for Multiple Gingival Recession– A New Prospects

2021 ◽  
pp. 65-83
Author(s):  
Ena Sharma ◽  
Amit Lakhani ◽  
Rasveen Kaur ◽  
Ravneet Kaur
Keyword(s):  
Soft Tissues ◽  
Surgical Techniques ◽  
Case Series ◽  
Multiple Root ◽  
Gingival Recession ◽  
Long Term Results ◽  
Treatment Modalities ◽  
Platelet Rich Fibrin ◽  
Advantages And Disadvantages ◽  
Wide Range

This case series reports the various treatment modalities to treat the multiple recessions. Gingival recession is a widespread clinical manifestation affecting single or multiple root surfaces at all teeth types. Periodontal reconstructive surgery consists of various mucogingival procedures. The primary goal of these procedures is to benefit periodontal health through the reconstruction of lost hard and soft tissues, or by preventing its additional loss, and also enhancing the esthetic appearance. Platelet-rich fibrin is a second generation platelet concentrate and is defined as an autologous leukocyte and platelet-rich fibrin biomaterial. Care was taken not to extend the incisions till the tip of the interdental papilla. A full thickness mucoperiosteal flap was reflected, extending beyond the mucogingival junction. A wide range of surgical techniques has been proposed for the treatment of the gingival recessions, each with its advantages and disadvantages. To provide predictable and long-term results, it is of paramount importance that the surgical technique is individually selected, taking into account several crucial factors such as the size of the defect, the width of the keratinised gingiva apical to the defect and the thickness of the flap.

scholarly journals Ideal Facial Relationships and Goals

2018 ◽  
Vol 34 (05) ◽  
pp. 458-465 ◽  
Author(s):  
Hope Bueller
Keyword(s):  
Roman Art ◽  
Facial Plastic Surgery ◽  
Cultural Considerations ◽  
Wide Range ◽  
Facial Plastic ◽  
The Face ◽  
Classical Models ◽  
Facial Proportions ◽  
The Individual ◽  
Art And Architecture

AbstractAnalysis of the face is an essential component of facial plastic surgery. In training, we are taught standards and ideals based on neoclassical models of beauty from Greek and Roman art and architecture. In practice, we encounter a wide range of variation in patient desires and perceptions of beauty. Our goals seem to be ever shifting, yet our education has provided us with a foundation from which to draw ideals of beauty. Plastic surgeons must synthesize classical ideas of beauty with patient desires, cultural nuances, and ethnic considerations all the while maintaining a natural appearance and result. This article gives an overview of classical models of facial proportions and relationships, while also discussing unique ethnic and cultural considerations which may influence the goal for the individual patient.

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