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Orthognathic

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https://www.readbyqxmd.com/read/28818322/stability-of-biodegradable-metal-mg-ca-zn-alloy-screws-compared-with-absorbable-polymer-and-titanium-screws-for-sagittal-split-ramus-osteotomy-of-the-mandible-using-the-finite-element-analysis-model
#1
Jee-Ho Lee, Hyung-Seop Han, Yu-Chan Kim, Jin-Yong Lee, Bu-Kyu Lee
Mg-Ca-Zn alloy has been suggested for the application of fixation materials during maxillofacial surgery. We investigated the stability of Mg-Ca-Zn alloy for clinical application during orthognathic surgery. The finite element model for the fixation of sagittal split ramus osteotomy was constructed. In the bicortical screw fixation of the mandible setback condition, the stress distributions of Mg-Ca-Za alloy, polylactic acid polymer, and titanium were evaluated using the virtual model with occlusal loading of 132 N...
July 4, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28806378/gummy-smile-correction-using-lingual-orthodontics-and-augmented-corticotomy-in-extremely-thin-alveolar-housing
#2
Kyung-Yen Nahm, Seung-Yun Shin, Hyo-Won Ahn, Seong-Hun Kim, Gerald Nelson
BACKGROUND: Tooth movement out of anatomic limitations was assisted by augmented corticotomy using deproteinized bovine bone mineral. METHODS: Lip protrusion can be reduced by premolar extraction followed by retraction of the anterior teeth. Surgical intervention is appropriate when the alveolar bone housing of the anterior region is insufficient for the tooth movement. In this patient, corticotomy in upper palatal area and anterior segmented osteotomy in the mandible were performed...
August 10, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28803664/should-patients-take-vitamin-d-before-mandibular-operations
#3
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/28800842/treatment-outcome-in-orthognathic-surgery-a-prospective-randomized-blinded-case-controlled-comparison-of-planning-accuracy-in-computer-assisted-two-and-three-dimensional-planning-techniques-part-ii
#4
Martin Bengtsson, Gert Wall, Lennart Greiff, Lars Rasmusson
PURPOSE: The aim of the present study was to compare the accuracy of two-dimensional (2D) and three-dimensional (3D) prediction methods. The hypothesis was that a 3D technique would give a more accurate outcome of the postoperative result. MATERIAL AND METHODS: Patients with severe class III occlusion were included and planed with both a 2D and 3D prediction technique. They were there after randomly subdivided into a control (2D) and test (3D) group and treated according to the technique randomized for...
July 12, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28793965/clinical-accuracy-of-waferless-maxillary-positioning-using-customized-surgical-guides-and-patient-specific-osteosynthesis-in-bimaxillary-orthognathic-surgery
#5
Marcus Heufelder, Frank Wilde, Sebastian Pietzka, Frank Mascha, Karsten Winter, Alexander Schramm, Majeed Rana
Computer-assisted planning and surgery for the treatment of orthognathic deformities have been extensively documented over the last decade. Computerized and customized wafers have lacked to improve the accuracy of maxillary positioning, resulting in a drawback of computer-assisted orthognathic surgery. The aim of this study was to determine the accuracy of a new technique of waferless maxillary positioning using customized surgical guides and patient specific osteosynthesis implants in bimaxillary orthognathic surgery...
July 8, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28791817/binder-syndrome-clinical-findings-and-surgical-treatment-of-18-patients-at-the-department-of-plastic-surgery-in-polanica-zdr%C3%A3-j
#6
Piotr H Drozdowski, Ireneusz Łątkowski, Mateusz G Zachara, Piotr Wójcicki
BACKGROUND: Binder syndrome (BS) is an uncommon congenital underdevelopment of the maxilla and nasal skeleton. Other clinical features include a hypoplastic or absent anterior nasal spine; a short, flat nose with short columella; an acute nasolabial angle; a convex upper lip and class III malocclusion. OBJECTIVES: The aim of the study was to outline the major characteristics of BS and to present a variety of surgical treatment methods. MATERIAL AND METHODS: The study included 18 patients treated in the authors' department from 1989 to 2013...
May 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28783745/an-integrated-surgical-protocol-for-adult-patients-with-hemifacial-microsomia-methods-and-outcome
#7
Kazuaki Yamaguchi, Daniel Lonic, Ellen Wen-Ching Ko, Lun-Jou Lo
BACKGROUND: Hemifacial microsomia (HFM) features hypoplasia and asymmetry in skeletal as well as soft tissue, and correction of the deformity is difficult in terms of aesthetic outcome. The purpose of this study is to examine the validity of an integrated treatment protocol for correction of this facial deformity. PATIENTS AND METHODS: A retrospective study was performed on adult HFM patients who received two-jaw orthognathic surgery combined with facial contouring procedures in the first stage, and fat injection for the residual facial deficiency in the second stage...
2017: PloS One
https://www.readbyqxmd.com/read/28760287/surgery-first-orthognathic-approach-vs-traditional-orthognathic-approach-oral-health-related-quality-of-life-assessed-with-2-questionnaires
#8
Sandro Pelo, Giulio Gasparini, Umberto Garagiola, Massimo Cordaro, Francesco Di Nardo, Edoardo Staderini, Romeo Patini, Paolo de Angelis, Giuseppe D'Amato, Gianmarco Saponaro, Alessandro Moro
INTRODUCTION: The purposes of the study were to investigate and evaluate the differences detected by the patients between the traditional orthognathic approach and the surgery-first one in terms of level of satisfaction and quality of life. METHODS: A total of 30 patients who underwent orthognathic surgery for correction of malocclusions were selected and included in this study. Fifteen patients were treated with the conventional orthognathic surgery approach, and 15 patients with the surgery-first approach...
August 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28754365/change-in-lip-closing-force-in-classes-ii-and-iii-malocclusion-before-and-after-sagittal-split-ramus-osteotomy-with-le-fort-i-osteotomy
#9
Takamitsu Tsutsui, Kunio Yoshizawa, Akinori Moroi, Asami Hotta, Kenichi Fukaya, Ryota Hiraide, Akihiro Takayama, Tatsuya Tsunoda, Yuki Saito, Ran Iguchi, Akihiko Kosaka, Hiroumi Ikawa, Koichiro Ueki
PURPOSE: The purpose of this study was to examine lip closing force in Class II and III patients before and after orthognathic surgery. SUBJECT AND METHODS: The subjects were 45 patients (15 Class II women, 15 Class III men and 15 Class III women) diagnosed with jaw deformity who underwent sagittal split ramus osteotomy with Le Fort I osteotomy and 30 controls with normal skeleton and occlusion (15 men, 15 women). Maximum and minimum lip closing forces were measured using Lip De Cum(®) before and after surgery, and compared statistically...
July 8, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28751183/three-dimensional-aesthetic-assessment-of-class-ii-patients-before-and-after-orthognathic-surgery-and-its-association-with-quantitative-surgical-changes
#10
A S Storms, L Vansant, E Shaheen, W Coucke, Cadenas de Llano-Pérula, R Jacobs, C Politis, G Willems
The aim of this study was to compare evaluations of the aesthetic outcome of class II orthognathic patients, as performed by observers with varying expertise using three-dimensional (3D) facial images, and to examine the relationship of aesthetic ratings in relation to quantitative surgical changes. Pre- and postoperative 3D facial images of 20 surgically treated class II patients (13 female, 7 male) were assessed for aesthetics by orthodontists, maxillofacial surgeons, and laypeople. Attractiveness ratings for the lips, chin, and overall facial aesthetics were evaluated on a 5-point Likert scale...
July 24, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28751182/unilateral-blindness-after-orthognathic-surgery-hypotensive-anaesthesia-is-not-the-primary-cause
#11
Á Rodríguez-Navarro, F M Gonzalez-Valverde
Perioperative vision loss in non-ocular surgery represents a rare but devastating complication and multiple causes have been proposed. Any portion of the visual system may be involved and several authors have tried to relate that complication with deliberate hypotension anaesthetic technique, used to control intraoperative bleeding. We report a patient operated for orthognathism who suffered unilateral blindness. After review of similar cases, we can state that the transmission of forces generated during Le fort I osteotomy is related to the complication...
July 24, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28749703/a-new-simple-three-dimensional-method-to-characterize-upper-airway-in-orthognathic-surgery-patient
#12
Gabriele Di Carlo, Sirwan Gurani Fernandez, Else Marie Pinholt, Paolo Cattaneo
OBJECTIVES: To develop and validate a new reproducible 3D upper airway analysis based on skeletal structures not involved in the modification, which occur during orthognathic surgery. METHODS: From retrospective cohort of orthognathic surgically treated patients, pre- and postsurgical CBCTscans of 10 post-pubertal patients were randomly selected. Two operators identified the landmarks, calculated the airway volumes, cross sections and linear measurements on the ten scans twice at two different time intervals...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28743605/three-dimensional-analysis-of-the-pharyngeal-airway-space-and-hyoid-bone-position-after-orthognathic-surgery
#13
Amanda Lury Yamashita, Liogi Iwaki Filho, Pablo Cornélius Comelli Leite, Ricardo de Lima Navarro, Adilson Luiz Ramos, Isolde Terezinha Santos Previdelli, Matheus Henrique Dal Molin Ribeiro, Lilian Cristina Vessoni Iwaki
PURPOSE: The aim of this study was to evaluate changes in the pharyngeal airway space (PAS) and hyoid bone position after orthognathic surgery with cone-beam computed tomography (CBCT). MATERIAL AND METHODS: This study was conducted with the tomographic records of 30 patients with skeletal class II or III deformities submitted to two different types of orthognathic surgery: Group 1 (n = 15), maxillary advancement, and mandibular setback; and Group 2 (n = 15), maxillomandibular advancement...
July 4, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28740973/prosthodontic-treatment-of-an-angle-iii-class-malocclusion-a-case-report
#14
Andreja Kuliš, Igor Kopač
Patients with an Angle Class III malocclusion are generally treated by orthodontics with or without orthognathic surgery. A literature search revealed very few articles describing solely the prosthodontic treatment of a Class III malocclusion, as it is rarely used as a treatment modality in these cases. The purpose of this article is to show the effects and benefits of an increase in the vertical dimension of the occlusion (VDO) in patients with a Class III malocclusion. An increase in the VDO causes a clockwise rotation of the mandible, thereby increasing the reverse overjet...
July 20, 2017: Quintessence International
https://www.readbyqxmd.com/read/28739094/automatic-repositioning-of-jaw-segments-for-three-dimensional-virtual-treatment-planning-of-orthognathic-surgery
#15
Rodrigo Mologni Gonçalves Dos Santos, José Mario De Martino, Luis Augusto Passeri, Romis Ribeiro de Faissol Attux, Francisco Haiter Neto
PURPOSE: To develop a computer-based method for automating the repositioning of jaw segments in the skull during three-dimensional virtual treatment planning of orthognathic surgery. The method speeds up the planning phase of the orthognathic procedure, releasing surgeons from laborious and time-consuming tasks. MATERIALS AND METHODS: The method finds the optimal positions for the maxilla, mandibular body, and bony chin in the skull. Minimization of cephalometric differences between measured and standard values is considered...
July 4, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28737562/dynamic-cleft-maxillary-orthopedics-and-periosteoplasty-25-patients-25-years
#16
Frederick N Lukash, Lauren B Shikowitz-Behr, Michael Schwartz, Frank Tuminelli
In 1985 this cleft team, dissatisfied with the treatment and results from cleft lip and palate repair, began a longitudinal long-term study using dynamic maxillary orthopedics and periosteoplasty as was originally described by Drs Millard and Latham. All cases were carefully documented through adolescence, including clinical assessments, orthodontic, radiographic, and cephalometric analyses. In 1998, in this journal, we published our data on 35 complete unilateral and 10 complete bilateral cleft patients. At that time facial growth was following normal cephalometric patterns...
July 22, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28735860/are-oral-and-maxillofacial-surgery-residents-being-adequately-trained-to-care-for-pediatric-patients
#17
Shelly Abramowicz, Leonard B Kaban, Andrew S Wurtzel, Steven M Roser
OBJECTIVE: To evaluate whether current oral and maxillofacial surgery (OMS) residents are receiving adequate training and experience to perform specific surgical procedures and anesthesia for pediatric patients. STUDY DESIGN: A 17-question survey was sent electronically to fellows of the American Academy of Craniomaxillofacial Surgeons. Descriptive data for individual surgeons, their associated residency programs, and the quantity of specific pediatric procedures they performed were collected...
May 4, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28732224/three-dimensional-changes-in-the-upper-airway-of-skeletal-class-iii-patients-after-different-orthognathic-surgical-procedures
#18
Yuxue Yang, Kai Yang, Ying Zhao
PURPOSE: We hypothesized that 3-dimensional changes in the upper airway of patients with skeletal Class III malocclusion are different after mandibular setback and maxillary advancement (MSMA) compared with mandibular setback (MS) and that upper airway changes and the amount of jaw movement are correlated. PATIENTS AND METHODS: Skeletal Class III patients who underwent MS surgery or MSMA surgery were included in this retrospective cohort study. Cone beam computed tomography scans were acquired before and 3 months after surgery...
June 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28732219/perioperative-systemic-corticosteroids-in-orthognathic-surgery-a-systematic-review-and-meta-analysis
#19
REVIEW
Simon Jean, Pierre-Luc Dionne, Carl Bouchard, Luc Giasson, Alexis F Turgeon
PURPOSE: Perioperative systemic corticosteroids are broadly used in orthognathic surgery to prevent postoperative complications, but it is unclear whether this practice is beneficial and concerns about potential side effects have been raised. The purpose of this systematic review and meta-analysis was to assess the effects of perioperative systemic corticosteroids on clinically important outcomes in patients undergoing orthognathic surgery. MATERIALS AND METHODS: The authors conducted a systematic review of randomized controlled trials evaluating the effect of systemic corticosteroids in orthognathic surgery compared with placebo or any other intervention...
June 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28721996/open-reduction-and-internal-fixation-screw-injury-retrospective-study
#20
Preetha Balaji, S M Balaji
BACKGROUND/AIMS: Open reduction and internal fixation (ORIF) is a standard surgical procedure in jaw trauma and in orthognathic surgery. Insertion of screws is a significant risk for accidental tooth root injury with varying outcomes. Contrary evidences are found in literature due to a variety of study designs. This study was undertaken to address the lacunae and possibly estimate the difference in occurrence of tooth damage during or after ORIF between trauma and planned osteotomies...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
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