scholarly journals Rapid prototyping: applications in oral and maxillofacial surgery

2020 ◽  
Vol 27 (1) ◽  
pp. 11
Author(s):  
Francesco Giovacchini ◽  
Massimiliano Gilli ◽  
Valeria Mitro ◽  
Gabriele Monarchi ◽  
Caterina Bensi ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
Maxillofacial Surgery ◽  
Cancer Recurrence ◽  
Oral And Maxillofacial Surgery ◽  
Aesthetic Outcome ◽  
Virtual Planning ◽  
Free Fibula ◽  
Cutting Guides ◽  
Stereolithographic Models

This article documents four mandibular reconstructions performed using free fibula flaps. CT scan DICOM (Digital Imaging and COmmunication in Medicine) files were obtained in order to print stereolithographic models of the mandible, and in one case cutting guides for fibular osteotomies. One case study details the treatment a cancer recurrence on a right emimandibulectomy. Because of a lack of access to previous CT scans, the left part of the mandible was mirrored to obtain an accurate 3D model. In one case, due to the young age of the woman, a double barrel fibula flap was used. All cases resulted in satisfactory chewing function and aesthetic outcome, with no flap failures. The report concludes that Virtual Planning and Rapid Prototyping are helpful as they reduce costs and intraoperative times while simultaneously improving surgical precision.

scholarly journals A segmental osteotomy with 3D virtual planning to move a malpositioned dental implant

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Dario Andrés Bastidas ◽  
Lina Roldan ◽  
Pamela Ramirez ◽  
Andrés Munera
Keyword(s):  
Dental Implant ◽  
Human Error ◽  
Maxillofacial Surgery ◽  
Oral And Maxillofacial Surgery ◽  
Class Iii ◽  
Virtual Planning ◽  
Case Presentation ◽  
Reverse Torque ◽  
The Aesthetic ◽  
Surgery Department

Abstract Background Correct positioning and alignment of dental implants are crucial to successfully meet the aesthetic and functional criteria in implant-prosthetic rehabilitation. When an implant is in the wrong position, especially in the esthetical zone, there are limited options to solve it. Some techniques have been described to reposition implants, such as reverse torque, trephine drills, and segmental osteotomies; current approaches aim to reduce the damage of the periimplant tissues. Case presentation A 20-year-old man with good general health was referred to the oral and maxillofacial surgery department of the CES University, Medellin Colombia in 2017, He had undergone a previous camouflage orthodontic therapy for a dental Class III, which finished in 2014, posteriorly a dental implant was placed in 2015 to replace upper right lateral incisor (1.2) before vertical growth of maxilla was complete; therefore, the implant was retained in a coronal position. A segmental osteotomy was suggested to reposition the implant in a more caudal position, a 3D surgical cut guide obtained by virtual planning was used to increase osteotomy accuracy and lower human error, to avoid the risk of damaging the adjacent tissues and to achieve a predictable result. Conclusions The segmental alveolar osteotomy is an effective alternative to reposition an implant; however, it must be carefully planned because human error remains a possibility that may affect the final result. Therefore, 3D planning is a better way to minimize these mistakes during the surgical procedure and the final position of the implant.

Three-Dimensional Custom-Made Surgical Guides in Facial Feminization Surgery: Prospective Study on Safety and Accuracy

2021 ◽  
Author(s):  
Pierre Tawa ◽  
Nicolas Brault ◽  
Vlad Luca-Pozner ◽  
Laurent Ganry ◽  
Ghassen Chebbi ◽  
...  
Keyword(s):  
Maxillofacial Surgery ◽  
Three Dimensional ◽  
Cerebrospinal Fluid Leak ◽  
Mandibular Angle ◽  
Virtual Planning ◽  
Surgical Guides ◽  
Sinus Wall ◽  
Custom Made ◽  
Cutting Guides ◽  
Fluid Leak

Abstract Background Facial feminization surgery (FFS) includes several osseous modifications of the forehead, mandible and chin, procedures which require precision in order to provide the patient with a satisfactory result. Mispositioned osteotomies can lead to serious complications and bad aesthetic outcomes. Surgical cutting guides are commonly used in plastic and maxillofacial surgery to improve safety and accuracy. Yet, there is no report in the literature on the clinical application of cutting guides in FFS. Objectives The aim of this paper is to assess the safety and accuracy of custom surgical cutting guides in FFS procedures. Methods A prospective follow-up of forty-five patients regarding FFS with preoperative virtual planning and 3D custom-made surgical guides for anterior frontal sinus wall setback, mandibular angle reduction and/or osseous genioplasty was conducted. Accuracy (superimposing preoperative data on postoperative data by global registration with a 1 mm margin of error), safety (intradural intrusion for the forehead procedures and injury of the infra alveolar nerve for chin and mandibular angles) and patient satisfaction were assessed. Results A total of 133 procedures were documented. There was no cerebrospinal fluid leak on the forehead procedures nor any infra alveolar nerve or tooth root injury on both chin and mandibular angle operations (safety, 100%). Accuracy was 90.80 % on the forehead (n=25), 85.72% on the mandibular angles (n=44) and 96.20% on the chin (n=26). An overall satisfaction of 94.40% was recorded. Conclusions Custom-made surgical cutting guides could be a safe and accurate tool for forehead, mandibular angles and chin procedures for FFS.

Study on Application of Rapid Prototyping in Precise Oral and Maxillofacial Surgery

2010 ◽  
Vol 102-104 ◽  
pp. 64-68 ◽  
Author(s):  
Yun Feng Liu ◽  
Xing Tao Dong ◽  
Hui Yong Zhu ◽  
Wei Peng
Keyword(s):  
Rapid Prototyping ◽  
Physical Model ◽  
Maxillofacial Surgery ◽  
Oral And Maxillofacial Surgery ◽  
Advanced Manufacturing ◽  
Operation Planning ◽  
Model Design ◽  
Model Reconstruction ◽  
Key Techniques

Conventional methods for diagnosis and operation planning based on 2D image are still widely used in oral and maxillofacial prostheses surgery, and the accuracy and efficiency are needed to improve eagerly. Aiming at this problem, rapid prototyping (RP), a technique of advanced manufacturing, is applied to fabricate the physical model of bone, and which is used to simulate the operation further. The procedure of RP based precise surgery is presented, and some key techniques including CT image processing, 3D bone model reconstruction, repairing model design, physical model fabrication, pre-operation simulation are discussed in detail. Total 25 successful clinical applications illustrate that, with RP based precise surgery methodology, the efficiency and quality of oral and maxillofacial prostheses can be improved effectively.

scholarly journals Knowledge Acquisition and Construction of a RDF-Ontology for Computer-Assisted Surgery

2021 ◽  
Author(s):  
Niclas Hagen ◽  
Reinald Kühle ◽  
Frederic Weichel ◽  
Urs Eisenmann ◽  
Petra Knaup-Gregori ◽  
...  
Keyword(s):  
Knowledge Acquisition ◽  
Maxillofacial Surgery ◽  
Computer Assisted Surgery ◽  
Mandibular Reconstruction ◽  
University Hospital ◽  
Planning System ◽  
Oral And Maxillofacial Surgery ◽  
Computer Assisted ◽  
Planning Systems ◽  
Virtual Planning

The integration of surgical knowledge into virtual planning systems plays a key role in computer-assisted surgery. The knowledge is often implicitly contained in the implemented algorithms. However, a strict separation would be desirable for reasons of maintainability, reusability and readability. Along with the Department of Oral and Maxillofacial Surgery at Heidelberg University Hospital, we are working on the development of a virtual planning system for mandibular reconstruction. In this work we describe a process for the structured acquisition and representation of surgical knowledge for mandibular reconstruction. Based on the acquired knowledge, an RDF(S) ontology was created. The ontology is connected to the virtual planning system via a SPARQL interface. The described process of knowledge acquisition can be transferred to other surgical use cases. Furthermore, the developed ontology is characterised by a reusable and easily expandable data model.

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