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Mandibular osteotomy

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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
#1
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/28927955/modified-hybrid-fixation-using-absorbable-plate-and-screw-for-mandibular-advancement-surgery
#2
Koichiro Ueki, Kunio Yoshizawa, Akinori Moroi, Asami Hotta, Takamitsu Tsutsui, Kenichi Fukaya, Ryota Hiraide, Akihiro Takayama, Tatsuya Tsunoda, Yuki Saito, Nana Baba, Momoko Sato
PURPOSE: The purpose of this study was to examine the skeletal stability of mandibular advancement after sagittal split ramus osteotomy (SSRO) with modified hybrid fixation using absorbable plates and screws. MATERIALS AND METHODS: A total of 54 Japanese patients were enrolled in this study. Of them, 23 who were diagnosed with mandibular prognathism underwent setback surgery with bi-cortical plate fixation using absorbable plates and screws (setback group). Another 23 who were diagnosed with mandibular retrognathism underwent advancement surgery with modified hybrid fixation using absorbable plates (advance group), and 8 who were diagnosed with mandibular retrognathism underwent advancement surgery with titanium plates (titanium group)...
August 10, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28927954/systematic-three-dimensional-analysis-of-wafer-based-maxillary-repositioning-procedures-in-orthognathic-surgery
#3
Timo Dreiseidler, Max-Philipp Lentzen, Matthias Zirk, Ali-Farid Safi, Joachim E Zoeller, Matthias Kreppel
PURPOSE: Little is known about the three-dimensional (3D) transfer accuracy in maxillary repositioning procedures based on conventionally manufactured dental-mounted wafers. The purpose of the present study was a systematic 3D analysis for wafer-based maxillary positioning in orthognathic surgery. MATERIALS AND METHODS: A total of 92 patients underwent Le Fort I in addition to mandibular bilateral sagittal split osteotomies (BSSO). Alignment of the pre- and postsurgical CBCT data sets allowed measuring maxillary position changes in axial, sagittal and transversal directions...
August 31, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28927743/does-a-mandibular-access-osteotomy-improve-survival-in-pt2-oral-tongue-cancers-retrospective-study-at-a-single-institution
#4
H S Ong, S Gokavarapu, Z Tian, J Li, W Cao, C P Zhang
The surgical approach to the resection of oral tongue cancers can involve transoral resection (TOR) or a temporary mandibulotomy access (TMA). There are no relevant guidelines, and the oncological safety of TOR needs consideration. The objective of this study was to investigate TMA and TOR in pT2 oral tongue cancer surgery with regard to cancer outcomes. Demographic, surgical, and histology data from primary pT2 tongue cancers were recorded and evaluated through multivariate Cox regression for local recurrence (LR), disease-free survival (DFS), and overall survival (OS)...
September 15, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28922248/maxillary-corticotomies-with-bone-to-bone-retraction-and-mandibular-segmental-osteotomy-for-correcting-an-anterior-double-protrusion
#5
Kyung A Kim, Baek-Soo Lee, Ayse Selenge Akbulut, Seong-Hun Kim, Gerald Nelson
BACKGROUNDS: This article presents maxillary corticotomies with bone-to-bone retraction and anterior segmental osteotomy (ASO) as an alternative to 2-jaw orthognathics in the bimaxilary protrusion patient with partially anchylosed maxillary anterior tooth. METHODS: The 18-year-old male, complaining of anterior protrusion, with a trauma history to the maxillary central incisor, and requesting rapid treatment, was treated with maxillary corticotomies in 2 stages and ASO in the mandible...
September 15, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28913308/new-treatment-in-facial-nerve-palsy-caused-by-sagittal-split-ramus-osteotomy-of-mandible
#6
Jin Hoon Lee, Kyung Ah Lee
A 25-years-old woman with mandibular prognathism underwent a mandibular setback by way of mandibular sagittal split ramus osteotomy (MSSRO). After 2 days of operation, she developed difficulty of closing her right eye. The blink reflex test and motor nerve conduction study of the right orbicularis oris muscle were revealed right facial neuropathy of unknown origin and House-Brackmann facial nerve grading system (HBFNGS) grade V. For treatment, we initially prescribed oral prednisolone and nimodipine including physical therapy...
March 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28906331/mandibular-surgical-navigation-an-innovative-guiding-method
#7
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/28875138/new-method-for-an-evaluation-of-the-esthetical-improvements-resulting-from-a-mandibular-angle-reduction
#8
Joo-Hwan Kim, Se-Jin Han, Moon-Young Kim
OBJECTIVES: This paper proposes Han's ratio as an objective and quantitative comparative result obtained from pre and postoperative data in patients with a mandibular angle reduction. MATERIALS AND METHODS: Thirty patients, 12 men and 18 women, who visited the Department of Oral and Maxillofacial Surgery with the chief complaints of skeletal mandibular prognathism and prominent mandibular angle were selected. The subjects were classified into 3 groups according to the types of surgical procedures involved...
August 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28872502/lingual-short-split-a-bilateral-sagittal-split-osteotomy-technique-modification
#9
Eduardo Sant'Ana, Denis Pimenta E Souza, Astrid Buysse Temprano, Elio H Shinohara, Paulo Esteves Pinto Faria
The technique of sagittal split osteotomy of the mandibular ramus is an established technique that has been evolving over the years, with significant improvements regarding stability, better bone contact between the segments, and possibilities of osteosynthesis. However, paresthesia is common in the postoperatory, sometimes permanent, and undesirable fractures in the subcondylar region can occur leading to longer operative time and extraoral scars. The short lingual split technique is an easy technique that simplifies the horizontal osteotomy of the ramus and decreases the risk of undesirable fractures with a neurosensitive recovery of patients in a much shorter time because of minor trauma and nerve manipulation during the execution...
September 1, 2017: Journal of Craniofacial 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
#10
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/28839184/achievability-of-3d-planned-bimaxillary-osteotomies-maxilla-first-versus-mandible-first-surgery
#11
Jeroen Liebregts, Frank Baan, Martien de Koning, Edwin Ongkosuwito, Stefaan Bergé, Thomas Maal, Tong Xi
The present study was aimed to investigate the effects of sequencing a two-component surgical procedure for correcting malpositioned jaws (bimaxillary osteotomies); specifically, surgical repositioning of the upper jaw-maxilla, and the lower jaw-mandible. Within a population of 116 patients requiring bimaxillary osteotomies, the investigators analyzed whether there were statistically significant differences in postoperative outcome as measured by concordance with a preoperative digital 3D virtual treatment plan...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28838820/safe-zone-in-anterior-mandible-related-to-the-genial-tubercle-for-implant-osteotomy-in-a-chinese-malaysian-population-a-cbct-study
#12
Yik Sze Voon, Pravinkumar G Patil
STATEMENT OF PROBLEM: The genial tubercle is a clinically palpable landmark in the mandible and can be identified in cone beam computed tomography (CBCT). Its location can be used to measure the safe zone in the interforaminal region of the mandible. These measurements may be helpful for implant treatment planning in patients with complete edentulism. PURPOSE: The purpose of this clinical study was to evaluate the safe distance in the interforaminal region of the mandible measured from the genial tubercle level for implant osteotomy in a Chinese-Malaysian population...
August 22, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28834834/three-dimensional-analysis-of-midfacial-soft-tissue-changes-after-maxillary-posterior-impaction-and-intraoral-vertical-ramus-osteotomy-for-mandibular-setback-in-class-iii-patients
#13
Seung-Won Seo, Young-Soo Jung, Hyoung-Seon Baik
This study investigated the correlation between the 3-dimensional changes in midfacial soft tissues, including the parasagittal area and maxilla-mandible complex, after Le Fort I maxillary posterior impaction and bilateral intraoral vertical ramus osteotomy (B-IVRO), using cone-beam computed tomography (CBCT). This retrospective study included 22 skeletal Class III patients (6 men and 16 women; mean age 21.6 years) who underwent orthognathic surgery. Three-dimensional CBCT images taken before and 1 year after surgery were superimposed based on the cranial base...
August 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28828951/clinical-outcomes-of-patient-specific-porous-titanium-endoprostheses-in-dogs-with-tumors-of-the-mandible-radius-or-tibia-12-cases-2013-2016
#14
Jonathan P Bray, Andrew Kersley, Warwick Downing, Katherine R Crosse, Andrew J Worth, Arthur K House, Guy Yates, Alastair R Coomer, Ian W M Brown
OBJECTIVE To characterize the processes involved in and outcomes achieved with custom-designed patient-specific implants to provide functional replacement of skeletal structures in dogs with tumors of the mandible, radius, or tibia. DESIGN Prospective case series. ANIMALS 6 dogs with mandibular tumors, 5 with tumors of the distal aspect of the radius, and 1 with a tumor in the distal aspect of the tibia treated from June 2013 to September 2016 at 3 referral centers. PROCEDURES After tumor staging, implants were designed from patients' CT scans by means of various computer-aided design applications and printed by means of selective laser melting in titanium-6 aluminum-4 vanadium alloy...
September 1, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/28822675/precise-osteotomies-for-mandibular-distraction-in-infants-with-robin-sequence-using-virtual-surgical-planning
#15
C M Resnick
Mandibular distraction osteogenesis (MDO) has become the first-line operation in many centers for the management of obstructive sleep apnea (OSA) in infants with (Pierre) Robin sequence (RS) not relieved by non-surgical approaches. Preoperative virtual surgical planning (VSP) may improve precision and decrease complications for this operation. This article reports a retrospective study of RS infants who underwent MDO for OSA using preoperative VSP and three-dimensionally printed cutting guides performed by one surgeon...
August 16, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28818502/trapezoidal-mandibular-osteotomy-for-augmentation-of-the-airway-in-sleep-apnoea
#16
J T Carneiro, E L de Souza Cruz, A K da Silva Tabosa, P H de Moraes
No abstract text is available yet for this article.
August 14, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28803664/should-patients-take-vitamin-d-before-mandibular-operations
#17
N Syed, G A Chiu, P Korczak
Vitamin D deficiency is endemic in the United Kingdom (UK), particularly in high-risk groups. We report the outcomes of patients with low concentrations of the vitamin who had complications after reduction of mandibular fractures or osteotomy, and those who were screened preoperatively. A deficiency can be diagnosed with a simple and inexpensive blood test, and in the UK the cost of a vitamin D tablet is about £0.04/tablet/day. Patients at risk of a deficiency should be screened before mandibular operations, and those listed for orthognathic surgery or replacement of the temporomandibular joint should be asked to take a supplement before operation...
August 10, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28773126/biomechanical-loading-evaluation-of-unsintered-hydroxyapatite-poly-l-lactide-plate-system-in-bilateral-sagittal-split-ramus-osteotomy
#18
Shintaro Sukegawa, Takahiro Kanno, Yoshiki Manabe, Kenichi Matsumoto, Yuka Sukegawa-Takahashi, Masanori Masui, Yoshihiko Furuki
OSTEOTRANS MX(®) (Takiron Co., Ltd., Osaka, Japan) is a bioactive resorbable maxillofacial osteosynthetic material composed of an unsintered hydroxyapatite/poly-l-lactide composite, and its effective osteoconductive capacity has been previously documented. However, the mechanical strength of this plate system is unclear. Thus, the aim of this in vitro study was to assess its tensile and shear strength and evaluate the biomechanical intensity of different osteosynthesis plate designs after sagittal split ramus osteotomy by simulating masticatory forces in a clinical setting...
July 7, 2017: Materials
https://www.readbyqxmd.com/read/28770155/skeletal-stability-following-mandibular-advancement-is-it-influenced-by-the-magnitude-of-advancement-or-changes-of-the-mandibular-plane-angle
#19
Reza Tabrizi, Mahsa Nili, Ehsan Aliabadi, Fereydoun Pourdanesh
OBJECTIVES: The aim of this study was to investigate the effects of advancement magnitude and changes in mandibular plane angle on the stability of mandibular advancement. MATERIALS AND METHODS: This retrospective cohort study evaluated the postoperative stability of mandibular advancement in class II skeletal subjects who underwent bilateral sagittal split osteotomy. Radiographs taken preoperatively, immediately postoperatively and 1 year postoperatively were traced and analyzed using linear and angular measurements...
June 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28767568/three-dimensional-virtual-planning-in-precise-chimeric-fibula-free-flap-for-metacarpal-defects-a-case-report
#20
Hui Shen, Xiang-Qian Shen, Ying Lv, Hui Lu, Jing-Hong Xu, Shou-Cheng Wu
RATIONALE: Metacarpal and phalanx defects with soft tissue loss were suggested to be reconstructed by vascularized bone flap. The fibular osteocutaneous flap is a preferred method. Three-dimensional virtual planning has successfully applied in mandibular reconstruction with fibular free flap. We applied three-dimensional virtual planning in precise fibula flap harvest to maintain the continuity of the fibula and to achieve accurate metacarpal and phalanx reconstruction. PATIENT CONCERNS: A 35-year-old male presented with extensive soft tissue defects and first metacarpal defect involving the first metacarpophalangeal joint...
August 2017: Medicine (Baltimore)
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