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Mandibular reconstruction

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https://www.readbyqxmd.com/read/28932947/integration-of-digital-dental-casts-in-cone-beam-computed-tomography-scans-a-clinical-validation-study
#1
Frits A Rangel, Thomas J J Maal, Martien J J de Koning, Ewald M Bronkhorst, Stefaan J Bergé, Anne Marie Kuijpers-Jagtman
OBJECTIVES: Images derived from cone beam computed tomography (CBCT) scans lack detailed information on the dentition and interocclusal relationships needed for proper surgical planning and production of surgical splints. To get a proper representation of the dentition, integration of a digital dental model into the CBCT scan is necessary. The aim of this study was to validate a simplified protocol to integrate digital dental models into CBCT scans using only one scan. MATERIALS AND METHODS: Conventional protocol A used one combined upper and lower impression and two CBCT scans...
September 20, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28932703/imaging-in-traumatic-mandibular-fractures
#2
REVIEW
Adil Naeem, Hugo Gemal, Duncan Reed
A fracture of the mandible is a common trauma presentation amongst young males and represents one of the most frequently encountered fractured bones within the viscerocranium. Historically, assault was the dominant contributing factor but now due to the increased number of vehicles used per capita, motor vehicle accidents are the primary cause. Mandibular fractures can be classified anatomically, by dentition, by muscle group and by severity. The fracture may also be closed, open, comminuted, displaced or pathological...
August 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28930778/radioprotection-with-amifostine-enhances-bone-strength-and-regeneration-and-bony-union-in-a-rat-model-of-mandibular-distraction-osteogenesis
#3
Catherine N Tchanque-Fossuo, Alexis Donneys, Sagar S Deshpande, Deniz Sarhaddi, Noah S Nelson, Laura A Monson, Sara E Dahle, Steve A Goldstein, Steven R Buchman
BACKGROUND: Using distraction osteogenesis (DO) to regenerate robust endogenous bone could greatly enhance postoncologic reconstruction of head and neck cancer. However, radiation (XRT) corrosive effects still preclude DO's immense potential. We posit that adjunctive pretreatment with the radioprotectant amifostine (AMF) can optimize wound healing and allow for successful DO with quantifiable enhancements in bony union and strength despite previous surgical bed irradiation. METHODS: Two groups of murine left hemimandibles were exposed to a human equivalent radiation dosage fractionated over 5 daily doses of 7 Gy...
September 19, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28922244/fibular-graft-effective-panorama-for-prosthetic-rehabilitation-of-resected-mandible
#4
Pankaj Kharade, Saidul Islam, Mahesh Verma, Swati Sharma, Ranjeet Bodh
Surgical management of extensive tumors in the mandibular region leads to massive disfigurement of the face. Also the prosthetic outcome of such patients rehabilitated with free soft tissue flaps is very poor. Reconstruction of extensive defects to overcome the disfigurement is a challenging procedure and can be achieved with free fibula flap. Free fibula graft provides sufficient length of bone for the reconstruction of the postsurgical defects. Excellent vascularity of fibula flap allows for easy uptake of the graft and osseointegration of the dental implants...
September 15, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28918340/-cervical-lift-an-update
#5
D Labbé, P Guerreschi
The neck is an aesthetic unit for which a rejuvenation request is sometimes very targeted or ore often encompassed in a global surgical project of face-lift. To obtain a long lasting outcome, the plastic surgeon has to make a full, detailed, and exhaustive analysis of the neck in order to choose the best indication within the multiple surgical tools. A full clinical examination is the key point, every aspects are outlined. The numerous surgical choices are described, illustrated, and sometimes revisited in the light of targeted anatomical studies...
September 13, 2017: Annales de Chirurgie Plastique et Esthétique
https://www.readbyqxmd.com/read/28918299/the-prosthetic-rehabilitation-of-a-patient-with-a-lateral-postsurgical-defect-using-a-2-piece-magnet-retained-facial-prosthesis-a-clinical-report
#6
Kariem M Elhelow, Yasser E Al-Thobaiti, Abdurabu A Gomawi
Nonsurgical prosthetic interventions are often proposed after repeated grafts have failed to restore irradiated facial defects. This report describes a facial prosthetic reconstruction following ablative surgery for a sizable facial tumor by using a novel custom-made magnet-bearing substructure, which connected with an exposed part of the mandibular reconstruction plate. The defect involved the entire left lower part of the face and angle of the mentum. This reconstructive technique, together with an added surface texture with hair-like silicone strands, effectively addressed the cosmetic needs of the patient...
September 14, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28913321/mixed-tumor-in-deep-lobe-and-versatility-of-acellular-dermal-matrix
#7
Jin Hwan Byun, Jung Soo Lim, Hye Kyung Lee
Frey's syndrome and infra-auricular depressed deformities are the ones of the most common complications that can occur after total parotidectomy. We report 1 case of pleomorphic adenoma occurred in the deep lobe that obtained good results from using acellular dermal matrix (ADM) after total parotidectomy. A 24-year-old man visited the hospital with oval shape mass in right mandibular angle which of 4 cm in size was found in the deep lobe of right parotid gland from Magnetic resonance imaging scanning and a pleomorphic adenoma was suspected...
June 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28906331/mandibular-surgical-navigation-an-innovative-guiding-method
#8
Vincenzo Abbate, Giovanni Dell' Aversana Orabona, Domenico Solari, Paola Bonavolontà, Giorgio Iaconetta, Luigi Califano
Mandibular osteotomies are usually required to treat craniomaxillofacial disorders. Losses of mandibular continuity result in esthetic and functional deficiency. During the past 30 years, the spread of the computer-assisted surgery techniques, rapid prototyping, and surgical navigation technique has improved the reliability and the outcomes of mandibular resections and reconstructions, by providing realtime feedback to surgeon. Recent studies reported the feasibility and the precision of surgical navigation applied to mandibular surgical resection and reconstruction with fibula flap but none of them describes a method to navigate the jaw allowing its full motility during the operation...
September 12, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28905342/quality-of-life-after-free-fibula-flap-reconstruction-of-segmental-mandibular-defects
#9
Jonas Löfstrand, Marcus Nyberg, Therese Karlsson, Andri Thórarinsson, Göran Kjeller, Mattias Lidén, Victoria Fröjd
No abstract text is available yet for this article.
September 13, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28894668/mucosal-perfusion-preservation-by-a-novel-shapeable-tissue-expander-for-oral-reconstruction
#10
Daria Barwinska, John Garner, Darrell D Davidson, Todd G Cook, George J Eckert, Sunil S Tholpady, Keith L March, Kinam Park, Clark T Barco
BACKGROUND: There are few methods for expanding oral mucosa, and these often cause complications such as tissue necrosis and expander eruption. This study examines mucosal blood perfusion following insertion of a novel shapeable hydrogel tissue expander (HTE). The canine model used subgingival insertion of HTE following tooth extraction and alveolar bone reduction. The primary goal of this study was to gain understanding of epithelial perfusion and reparative responses of gingival mucosa during HTE expansion...
August 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28894659/prevention-of-mandible-reconstruction-plate-exposure-by-costal-cartilage-wrapping
#11
Motonao Iwasawa, Yoshito Mishima, Miho Ohtsubo
After mandibulectomy in cancer surgery, reconstruction is often performed with a reconstruction plate covered with a soft-tissue free flap in patients in poor condition. However, the rate of complications for mandibular reconstruction is higher with a reconstruction plate than with vascularized bone grafts. We have developed a costal cartilage wrapping method to prevent exposure of the mandible reconstruction plate. The eighth costal cartilage was removed and split into 2 pieces to wrap around the reconstruction plate...
August 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28888409/maxillofacial-prosthetic-treatment-factors-affecting-oral-health-related-quality-of-life-after-surgery-for-patients-with%C3%A2-oral-cancer
#12
Miki Hagio, Ken Ishizaki, Masahiro Ryu, Takeshi Nomura, Nobuo Takano, Kaoru Sakurai
STATEMENT OF PROBLEM: After oral cancer surgery, tissue defects can cause deformity and limited mobility, complicating many essential functions. For patients with mandibular, tongue, and oral floor defects, evidence regarding the effects of maxillofacial prosthetics on their oral health-related quality of life (OHRQoL) is lacking. Therefore, maxillofacial prosthetic reconstruction has been implemented with no clear treatment goals. PURPOSE: The purpose of this study was to identify factors affecting the improvement of OHRQoL by using maxillofacial prosthetic treatment after surgery to repair maxillary, mandibular, tongue, and oral floor defects...
September 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28882499/secondary-surgical-management-of-osteoradionecrosis-using-three-dimensional-isodose-curve-visualization-a-report-of-three-cases
#13
J Kraeima, R J H M Steenbakkers, F K L Spijkervet, J L N Roodenburg, M J H Witjes
Osteoradionecrosis is defined as bone death secondary to radiotherapy. There is a relationship between the radiation dose received and the occurrence of osteoradionecrosis of the jaws, with the risk increasing above a dose of 60Gy. In cases of class III mandibular osteoradionecrosis, a segmental resection can be indicated. Current practice is to completely remove the affected bone up to the point where the bone looks healthy and is bleeding. Exact resection planning and the use of guided surgery based on imaging of the bone changes have not been reported so far...
September 4, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28868631/finite-element-analysis-of-customized-implant-in-mandibular-reconstruction-after-tumor-resection-with-and-without-using-customized-surgical-osteotomy-guide
#14
Sandeep Dahake, Abhaykumar Kuthe, Sanket Kulkarni, Mahesh Mawale
OBJECTIVES: The aim of this work was to compare different 12 cases (3 patients * 4 cases = 12 cases) with varying gaps between implant and bone by analyzing the effect of these gaps on implant and screws using FEM. METHODS: In each patient's case 1 using CSOG and in case 2, 3, and 4 without using CSOG tumor cutting was done. Hence in each patient zero gaps at case 1 and overcutting at case 2, 3, and 4 have obtained at different locations. RESULTS: FEM results reveal that in each patient's case 4 (maximum gap) was more susceptible to loosening of the screws due to higher strains (37%) and implant failure due to higher stress (28%) concentration under the same loading conditions when compared with case 1 (zero gap)...
September 4, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28861389/cone-beam-computed-tomographic-evaluation-of-the-temporomandibular-joint-and-dental-characteristics-of-patients-with-class-ii-subdivision-malocclusion-and-asymmetry
#15
Mingna Huang, Yun Hu, Jinfeng Yu, Jicheng Sun, Ye Ming, Leilei Zheng
OBJECTIVE: Treating Class II subdivision malocclusion with asymmetry has been a challenge for orthodontists because of the complicated characteristics of asymmetry. This study aimed to explore the characteristics of dental and skeletal asymmetry in Class II subdivision malocclusion, and to assess the relationship between the condyle-glenoid fossa and first molar. METHODS: Cone-beam computed tomographic images of 32 patients with Class II subdivision malocclusion were three-dimensionally reconstructed using the Mimics software...
September 2017: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/28855872/a-novel-method-to-detect-3d-mandibular-changes-related-to-soft-diet-feeding
#16
Kana Kono, Chihiro Tanikawa, Takeshi Yanagita, Hiroshi Kamioka, Takashi Yamashiro
Craniofacial morphology varies among individuals, which is regulated by the interaction between genes and the environment. Soft-diet feeding is a widely-used experimental model for studying the association between the skeletal morphology and muscle-related loading on the bone. Traditionally, these studies have been based on linear and angular measurements provided on two-dimensional (2D) radiographs in the lateral view. However, 2D observation is based on simplification of the anatomical structures and cannot detect three-dimensional (3D) changes in detail...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28844337/temporomandibular-joint-reconstruction-after-condylar-fracture-complication-related-to-osteosynthesis-material
#17
J F C Dantas, J N Nogueira Neto, V A Sarmento, P S F Campos
Total condylar resorption and the failure of bone synthesis material as postoperative complications of condyle fracture are seldom reported in the literature. When these occur, they may severely limit temporomandibular joint (TMJ) function. In such cases, a reconstruction of the joint is indicated, which can be achieved by means of an alloplastic prosthesis. This article reports a rare case of impaction of osteosynthesis material in the region of the base of the skull associated with a mandibular condyle fracture treated with rigid internal fixation, which resulted in complications...
August 22, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28839482/comparison-of-mesiodistal-root-angulation-measured-from-conventional-and-cbct-derived-panoramic-radiographs-in-orthodontic-patients
#18
Ibrahim Nasseh, Douglas Jensen, Marcel Noujeim
INTRODUCTION: Use of cone beam computed tomography (CBCT) in orthodontics is increasing; however, some patients started treatment with conventional images. The objective of this study is to manipulate CBCT panoramic reconstruction to make it comparable to conventional panoramic image and to compare mesiodistal root angulations on both images. MATERIALS AND METHODS: Concurrent conventional panoramics and CBCT volumes were obtained from 40 subjects. CBCT volumes were manipulated to generate pan-like images that mimic the occlusal plane angle of the corresponding panoramic, allowing comparison of mesiodistal root angulations and determination of the head-tilt required to produce the reconstruction...
2017: Open Dentistry Journal
https://www.readbyqxmd.com/read/28838837/osteomyocutaneous-fibular-flap-harvesting-computer-assisted-planning-of-perforator-vessels-using-computed-tomographic-angiography-scan-and-cutting-guide
#19
Salvatore Battaglia, Vincenzo Maiolo, Gabriella Savastio, Maurizio Zompatori, Federico Contedini, Elisa Antoniazzi, Riccardo Cipriani, Claudio Marchetti, Achille Tarsitano
INTRODUCTION: Mandibular reconstruction performed after virtual planning has become more common during recent years. The gold standard for extensive mandibular reconstruction is of course a fibular free flap. In designing an osteomyocutaneous fibula flap, poor planning, aberrant anatomy and/or inadequate perforator vessels are the most frequent causes of complications and may force the surgeon to modify the flap design, explore the contralateral leg or harvest an additional microvascular flap...
July 29, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28838835/biomechanical-evaluation-of-a-novel-hybrid-reconstruction-plate-for-mandible-segmental-defects-a-finite-element-analysis-and-fatigue-testing
#20
Cheng-Hsien Wu, Yang-Sung Lin, Yu-Shen Liu, Chun-Li Lin
PURPOSE: This study develops a novel hybrid (NH) reconstruction plate that can provide load-bearing strength, secure the bone transplant at the prosthesis favored position, and also maintain the facial contour in a mandibular segmental defect. A new patient-match bending technique which uses a three-dimensional printing (3DP) stamping process is developed to increase the interfacial fit between the reconstruction plate and mandibular bone. MATERIALS AND METHODS: The NH reconstruction plate was designed to produce a continuous profile with non-uniform thickness and triangular cross-screw patterns with a locking-screw feature at the plate base...
July 27, 2017: Journal of Cranio-maxillo-facial Surgery
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