Secondary Repair of the Zygoma

2017 ◽  
Vol 33 (06) ◽  
pp. 571-580
Author(s):  
Susan Yanik ◽  
Sherard Tatum ◽  
Susannah Orzell
Keyword(s):  
Internal Fixation ◽  
Open Reduction ◽  
Computer Assisted ◽  
Rare Entity ◽  
Functional Deficits ◽  
Computer Assisted Design ◽  
Cad Cam ◽  
Fixation Techniques ◽  
Virtual Mapping ◽  
Crucial Part

AbstractSecondary deformities of the zygoma are a rare entity, thanks to the adoption and refinement of open reduction and internal fixation techniques. These injuries are often difficult to treat due to the unique structural, functional, and aesthetic properties of the zygoma. Purely cosmetic defects can often be managed with implants; however, functional deficits generally require mobilization, correction, and subsequent fixation of the defect(s). Performing the necessary osteotomies to mobilize the zygoma is the most crucial part of the procedure, and had traditionally been executed without the use of computer aids. Planning for and performing this step was very difficult and frequently resulted in unsatisfactory outcomes. Recent advancements in virtual mapping and planning have obviated the need for guesswork and have resulted in improved functional and aesthetic outcomes following repositioning. This article will discuss the use of implants, osteotomies, and computer-assisted design/modeling (CAD/CAM) in addressing secondary deformities of the zygoma.

Connector Architecture for Computer-Assisted Design and Manufacturing Systems

2004 ◽  
Vol 20 (04) ◽  
pp. 262-268
Author(s):  
Reinhard M. Staebler ◽  
Bryan J. Miller ◽  
Paul J. Rakow ◽  
Thomas Koch
Keyword(s):  
Data Exchange ◽  
Manufacturing Systems ◽  
Reference Model ◽  
Computer Assisted ◽  
Computer Assisted Design ◽  
Cad Cam ◽  
Flexible Integration ◽  
Business Objects ◽  
Negative Impacts ◽  
Cam Systems

Flexible integration concepts for computer-assisted design (CAD) and manufacturing (CAM) systems have been identified as a key to let shipyards select and implement best-in-class software components for their CAD and CAM operations. Current implementations are dominated by bilateral links based on proprietary data exchange formats and are too complex to upgrade parts of a CAD/CAM infrastructure without negative impacts on the other parts. This paper describes the ongoing development of a connector architecture for CAD and CAM systems in shipbuilding. The architecture decouples CAD and CAM systems on the basis of a flexible integration technology, utilizing XML data exchange, lightweight directory access protocol (LDAP), and message-based communication. An enterprise reference model describing all relevant shipbuilding business objects forms the basis for the integration. So-called adapters connect the various CAD and CAM systems to the architecture. An automatic nesting solution is presented as a sample business solution in the connector architecture environment.

Accuracy Assessment of Immediate and Delayed Implant Placements Using CAD/CAM Surgical Guides

2016 ◽  
Vol 42 (5) ◽  
pp. 391-398 ◽  
Author(s):  
Fawaz Alzoubi ◽  
Nima Massoomi ◽  
Anders Nattestad
Keyword(s):  
Accuracy Assessment ◽  
Computer Assisted ◽  
Apical Position ◽  
Surgical Guides ◽  
Computer Assisted Design ◽  
Significant Difference ◽  
Cad Cam ◽  
Delayed Group ◽  
Immediate Implant ◽  
Delayed Implant Placement

The aim of this study is to assess the accuracy of immediately placed implants using Anatomage Invivo5 computer-assisted design/computer-assisted manufacturing (CAD/CAM) surgical guides and compare the accuracy to delayed implant placement protocol. Patients who had implants placed using Anatomage Invivo5 CAD/CAM surgical guides during the period of 2012–2015 were evaluated retrospectively. Patients who received immediate implant placements and/or delayed implant placements replacing 1–2 teeth were included in this study. Pre- and postsurgical images were superimposed to evaluate deviations at the crest, apex, and angle. A total of 40 implants placed in 29 patients were included in this study. The overall mean deviations measured at the crest, apex, and angle were 0.86 mm, 1.25 mm, and 3.79°, respectively. The means for the immediate group deviations were: crest = 0.85 mm, apex = 1.10, and angle = 3.49°. The means for the delayed group deviations were: crest = 0.88 mm, apex = 1.59, and angle = 4.29°. No statistically significant difference was found at the crest and angle; however, there was a statistically significant difference between the immediate and delayed group at the apex, with the immediate group presenting more accurate placements at the apical point than the delayed group. CAD/CAM surgical guides can be reliable tools to accurately place implants immediately and/or in a delayed fashion. No statistically significant differences were found between the delayed and the immediate group at the crest and angle, however apical position was more accurate in the immediate group.

Three-Dimensional Digital Design for Osteotomy in the Treatment of Congenital Hemivertebra

2013 ◽  
Vol 804 ◽  
pp. 167-173
Author(s):  
Huan Wen Ding ◽  
Guang Wen Yu ◽  
Qiang Tu ◽  
Jian Jian Shen ◽  
Ying Jun Wang
Keyword(s):  
Computer Simulation ◽  
Internal Fixation ◽  
Pedicle Screw ◽  
Operative Time ◽  
Design Method ◽  
Three Dimensional ◽  
Digital Design ◽  
Computer Assisted ◽  
Computer Assisted Design ◽  
Computer Aided

To establish a new three-dimensional (3D) digital design method for osteotomy and assess its application value in the surgical treatment of hemivertebrae. Preoperative 3D digital designs for osteotomy of the hemivertebrae were performed, which included computer simulation of the osteotomy and the internal fixation process, and computer-assisted design (CAD) of the templates for osteotomy of the hemivertebrae, pedicle screw positioning, and internal fixation rods. Template-guided osteotomy of the hemivertebrae plus pedicle screw and rod internal fixation were accurately implemented. The preoperative use of this new computer-aided 3D digitized and paperless surgical design can improve the safety, accuracy, and operative time for osteotomy in the treatment of hemivertebrae.

scholarly journals Combining Intraoral and Face Scans for the Design and Fabrication of Computer-Assisted Design/Computer-Assisted Manufacturing (CAD/CAM) Polyether-Ether-Ketone (PEEK) Implant-Supported Bars for Maxillary Overdentures

Scanning ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Francesco Mangano ◽  
Carlo Mangano ◽  
Bidzina Margiani ◽  
Oleg Admakin
Keyword(s):  
Soft Tissues ◽  
Previous Treatment ◽  
Digital Impression ◽  
Computer Assisted ◽  
Success Rates ◽  
Computer Assisted Design ◽  
Polyether Ether Ketone ◽  
Cad Cam ◽  
Passive Fit ◽  
Ether Ketone

Purpose. To present a digital method that combines intraoral and face scanning for the computer-assisted design/computer-assisted manufacturing (CAD/CAM) fabrication of implant-supported bars for maxillary overdentures. Methods. Over a 2-year period, all patients presenting to a private dental clinic with a removable complete denture in the maxilla, seeking rehabilitation with implants, were considered for inclusion in this study. Inclusion criteria were fully edentulous maxilla, functional problems with the preexisting denture, opposing dentition, and sufficient bone volume to insert four implants. Exclusion criteria were age<55 years, need for bone augmentation, uncompensated diabetes mellitus, immunocompromised status, radio- and/or chemotherapy, and previous treatment with oral and/or intravenous aminobisphosphonates. All patients were rehabilitated with a maxillary overdenture supported by a CAD/CAM polyether-ether-ketone (PEEK) implant-supported bar. The outcomes of the study were the passive fit/adaptation of the bar, the 1-year implant survival, and the success rates of the implant-supported overdentures. Results. 15 patients (6 males, 9 females; mean age 68.8±4.7 years) received 60 implants and were rehabilitated with a maxillary overdenture supported by a PEEK bar, designed and milled from an intraoral digital impression. The intraoral scans were integrated with face scans, in order to design each bar with all available patient data (soft tissues, prosthesis, implants, and face) in the correct spatial position. When testing the 3D-printed resin bar, 12 bars out of 15 (80%) had a perfect passive adaptation and fit; in contrast, 3 out of 15 (20%) did not have a sufficient passive fit or adaptation. No implants were lost, for a 1-year survival of 100% (60/60 surviving implants). However, some complications (two fixtures with peri-implantitis in the same patient and two repaired overdentures in two different patients) occurred. This determined a 1-year success rate of 80% for the implant-supported overdenture. Conclusions. In this study, the combination of intraoral and face scans allowed to successfully restore fully edentulous patients with maxillary overdentures supported by 4 implants and a CAD/CAM PEEK bar. Further studies are needed to confirm these outcomes.

scholarly journals Digital Dentistry: The future is now

2018 ◽  
Vol 25 (2) ◽  
pp. 8
Author(s):  
Edison Andrés Cruz
Keyword(s):  
Computer Assisted ◽  
Digital Dentistry ◽  
Computer Assisted Design ◽  
Design And Manufacturing ◽  
The Future ◽  
Cad Cam

La práctica clínica de la odontología avanzó desde los últimos 20 años, con la inmersión del CAD/CAM (Computer-assisted Design and Manufacturing), reduciendo tanto los pasos para la realización de una corona o prótesis, como mejorando la eficiencia, calidad del tratamiento y por consiguiente, la experiencia percibida por los pacientes. En Estados Unidos se estima que, el 15% de los consultorios practican Odontología Digital, es decir, hacen uso de tecnología CAD/CAM e impresión digital 3D. Además, para el año 2017, se estimó el uso de 19,000 unidades de CAD/CAM en las oficinas dentales de odontólogos americanos, mostrando que, los avances de la tecnología que veíamos muy lejanos, son una realidad, hoy (1,2). A pesar de estas cifras, las universidades han adoptado el entrenamiento en tecnología digital odontológica tímidamente, tal como lo han manifestado, según el entusiasmo por parte de docentes y estudiantes. Esto se ve reflejado en la  incipiente publicación de artículos científicos en ésta área. La odontología digital se ha desarrollado en varios campos dentro de la odontología. De hecho, se ha utilizado desde el diagnóstico, planificación del tratamiento, hasta el diseño y elaboración de prótesis y restauraciones. Dentro de las herramientas de la  odontología digital, se encuentra el escáner intraoral. Los escáneres han permitido capturar información detallada de las estructuras anatómicas dentales, óseas y tejidos blandos del paciente.

Study of Machinable Dental Glass Ceramics

2009 ◽  
Vol 620-622 ◽  
pp. 575-578 ◽  
Author(s):  
Xin Pei Ma ◽  
Guang Xin Li ◽  
Zhi Hao Jin ◽  
Ji Hua Chen ◽  
Mao Ju Yang ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Orthogonal Experimental Design ◽  
Computer Assisted ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dental Restorations ◽  
Computer Assisted Design ◽  
All Ceramic ◽  
Cad Cam ◽  
Good Biocompatibility

Glass-ceramics are especially useful for the dental restorations because of their good biocompatibility, chemical stability, aesthetic, mechanical strength and wear resistance. The aim of this work was to obtain one mica glass-ceramic, which can be easily used for rapid machining into all-ceramic tooth with computer assisted design/computer assisted manufacture (CAD/CAM) devices. In the study, on the base of low melting machinable fluorosilicic mica glass ceramics, the effects of CeO2 and Fe2O3 in SiO2-B2O3-K2O-Na2O-Li2O-Al2O3-MgO-F system on color were studied. By orthogonal experimental design, the effects of crystallized parameters on the color, three point flexural strength and machinability of the glass ceramics were obtained, and the samples were analyzed by differential thermal analysis(DTA), X-ray diffraction (XRD) and scanning electron microscopy(SEM), respectively. Experimental results showed that the glass-ceramics with color close to the tooth can be obtained by adjusting the percentage of CeO2 and Fe2O3, and the glass-ceramics crystallized at 680°C for 2h have excellent mechanical properties and machinability.

scholarly journals Clinical Accuracy of 3D-Planned Maxillary Positioning Using CAD/CAM-Generated Splints in Combination With Temporary Mandibular Fixation in Bimaxillary Orthognathic Surgery

2020 ◽  
Vol 13 (4) ◽  
pp. 290-299
Author(s):  
S. Pietzka ◽  
F. Mascha ◽  
K. Winter ◽  
P. W. Kämmerer ◽  
A. Sakkas ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Sagittal Plane ◽  
Vertical Plane ◽  
Computer Assisted ◽  
3 Dimensional ◽  
Computer Assisted Design ◽  
Bimaxillary Orthognathic Surgery ◽  
Cad Cam ◽  
Clinical Accuracy ◽  
Bimaxillary Surgery

Study Design: The aim of this study was to evaluate the accuracy of 3-dimensional (3D)-planned maxillary positioning by using computer-assisted design (CAD)/computer-assisted manufacturing (CAM) splints combined with temporary mandibular fixation in bimaxillary orthognathic surgery. In orthognathic surgery, customized splints work sufficiently well to transfer preoperative planning into the operation site for transverse und sagittal positioning of the maxilla. The vertical positioning is more difficult due to the non-fixed mandibular reference. Therefore, the combined use of CAD/CAM splints and temporary mandibular fixation to the zygomatic region was applied for transferring the 3D-planned maxillary position into the operation site from 2012 until 2015 in our hospital. Objective: In addition to the general accuracy, the precision should therefore be checked especially in the vertical plane compared to axial and sagittal plane. Methods: In this retrospective study, we calculated the deviation of 5 occlusal landmarks of the maxilla in 35 consecutive patients by fusing preoperative 3D planning images and postoperative computed tomography scans after bimaxillary surgery. Results: The overall median deviation of maxillary positioning between plan and surgical result was 0.99 mm. The accuracy of left–right positioning was median 0.96 mm. Anterior–posterior positioning of the maxilla showed a median accuracy of 0.94 mm. Just slightly higher values were determined for the upward–downward positioning (median 1.06 mm). Conclusions: This demonstrates the predictability of maxillary positioning by using CAD/CAM splints in combination with temporary mandibular fixation in all 3 axes.

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