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Orthognathic

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https://www.readbyqxmd.com/read/29457192/influence-of-orthodontic-appliance-derived-artifacts-on-3-t-mri-movies
#1
Erika Ozawa, Ei-Ichi Honda, Kulthida Nunthayanon Parakonthun, Hiroko Ohmori, Kazuo Shimazaki, Tohru Kurabayashi, Takashi Ono
BACKGROUND: Magnetic resonance imaging (MRI) has been used to study configurations of speech organs in the resting state. However, MRI is sensitive to metals, and numerous types of metallic appliances, most of which have a large magnetic susceptibility, are used in orthodontic treatment and may cause severe artifacts on MRI. We have developed techniques for obtaining MRI movies of the oral region, to evaluate articulatory changes, especially movement of the tongue, palate, and teeth, pre- and post-orthodontic/orthognathic treatment...
February 19, 2018: Progress in Orthodontics
https://www.readbyqxmd.com/read/29456771/pulpal-and-periodontal-tissues-changes-associated-with-le-fort-i-and-sagittal-split-ramus-osteotomies-a-review
#2
REVIEW
Konstantinos Lazaridis, Maria Lazaridou, Athanasios E Athanasiou
Introduction: Le Fort I and sagittal split ramus osteotomies are the most commonly performed orthognathic surgery procedures on the maxilla and mandible, respectively. Techniques: Despite progress in the techniques, these procedures may still be associated with morbidity, expressed as inflammation, inadequate bony union, periodontal damages or in extreme cases even total bone loss. Discussion: Through a comprehensive review of the literature, the influences of maxillary and mandibular surgery on Pulpal Blood Flow (PBF), pulp sensitivity and pulp vitality are examined...
2018: Open Dentistry Journal
https://www.readbyqxmd.com/read/29447829/custom-made-titanium-miniplates-associated-with-ultrahigh-molecular-weight-polyethylene-graft-in-orthognathic-surgery-an-adjunct-to-maxillary-advancement
#3
José Thiers Carneiro Júnior, Paulo Hemerson de Moraes, Douglas Voss de Oliveira, Nayara Cristina Monteiro Carneiro
Patients with considerable maxillomandibular anteroposterior discrepancies and maxillary hypoplasia require corrective treatment through orthognathic surgery. However, in the treatment of severe maxillary retrognathism, it is necessary to reconstruct areas of bone deficiency through grafting techniques in addition to maxillary advancement using only the Le Fort I osteotomy. Treatment in these patients is more challenging and requires high surgical predictability. Alloplastic materials often have been used for the reconstruction of poor bone contours...
January 31, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29444377/a-biomechanical-analysis-of-prognathous-and-orthognathous-insect-head-capsules-evidence-for-a-many-to-one-mapping-of-ridge-strain-to-head-strain
#4
Alexander Blanke, Manuel Pinheiro, Peter J Watson, Michael J Fagan
Insect head shapes are remarkably variable but the influences of these changes on biomechanical performance are unclear. Among "basal" winged insects, such as dragonflies, mayflies, earwigs, and stoneflies, some of the most prominent anatomical changes are the general mouthpart orientation, eye size and the connection of the endoskeleton to the head. Here, we assess these variations as well as differing ridge and sclerite configurations using modern engineering methods including multibody dynamics modelling and finite element analysis in order to quantify and compare the influence of anatomical changes on strain in particular head regions and the whole head...
February 14, 2018: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29442244/postural-assessment-in-class-iii-patients-before-and-after-orthognathic-surgery
#5
Fernando Zugno Kulczynski, Fernando de Oliveira Andriola, Pedro Henrique Deon, Denizar Alberto da Silva Melo, Rogério Miranda Pagnoncelli
PURPOSE: This study aimed to assess body posture before and after bimaxillary orthognathic surgery by photogrammetry in skeletal class III patients. METHODS: Thirty-one patients with skeletal class III dentofacial deformities (14 men, 17 women) who underwent orthodontic preparation for surgery were included in this non-randomized controlled trial. Of these, 15 who did not undergo orthognathic surgery during the period of this study served as controls. Postural assessment was performed by photogrammetry using SAPO® (Postural Assessment Software) based on anterior-, posterior-, and lateral-view images taken 1 month before and 4 months after bimaxillary orthognathic surgery with internal rigid fixation (or 4 months after the initial assessment, for the control group)...
February 13, 2018: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29437505/cleft-skeletal-asymmetry-asymmetry-index-classification-and-application
#6
Delnaz S Patel, Rachel Jacobson, Yao Duan, Linping Zhao, David Morris, Mimis N Cohen
OBJECTIVE: To quantitatively measure the extent of 3D asymmetry of the facial skeleton in patients with unilateral cleft lip and palate (UCLP) using an asymmetry index (AI) approach, and to illustrate the applicability of the index in guiding and measuring treatment outcome. METHOD: Two groups of subjects between the ages of 15 and 20 who had archived CBCT scan were included in this study. Twenty-five patients with complete UCLP were compared with 50 age-matched noncleft subjects...
March 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29429068/stability-of-maxillary-protraction-therapy-in-children-with-class-iii-malocclusion-a-systematic-review-and-meta-analysis
#7
Yifan Lin, Runzhi Guo, Liyu Hou, Zhen Fu, Weiran Li
OBJECTIVE: The objective of this study was to evaluate the stability of treatment effects of maxillary protraction therapy in Class III children. MATERIALS AND METHODS: Multiple electronic databases were searched from 01/1996 to 10/2016. Randomized clinical trials, controlled clinical trials, and cohort studies with untreated Class III controls and a follow-up over 2 years were considered for inclusion. The methodological quality of the studies and publication bias were evaluated...
February 10, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29425750/the-influential-bony-factors-and-vectors-for-predicting-soft-tissue-responses-after-orthognathic-surgery-in-mandibular-prognathism
#8
Yoon-Sic Han, Ho Lee
PURPOSE: We sought to identify the hard tissue points and vectors that have the greatest effect on soft tissue movement after orthognathic surgery in patients with mandibular prognathism. PATIENT AND METHODS: The present retrospective study involved patients who had undergone mandibular setback surgery with or without maxillary advancement. Multiple linear regression models were adapted to evaluate the association between the 8 hard tissue landmark (predictor variables) changes and 11 soft tissue responses (outcome variables) using the x and y coordinates assessed from superimposed pre- and postoperative 3-dimensional computed tomography images...
January 31, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29420385/orthognathic-surgery-and-implant-supported-bridge-in-a-class-iii-patient-injured-in-a-motor-vehicle-accident
#9
Koji Honda, Makoto Hirota, Toshinori Iwai, Koichi Fujita, Susumu Omura, Takashi Ono, Iwai Tohnai
Occlusal and esthetic rehabilitation of jaw deformities in patients with partially edentulous maxilla are challenging procedures. This article describes a patient involving a skeletal Class III, 36-year-old male patient with a single bilateral anterior partially edentulous maxilla resulting from injuries sustained in a motor vehicle accident; his anterior teeth had been lost for more than 10 years. His lip protruded from the lateral view due to the proclined upper incisors and mandibular protrusion.Because of the facial deformity and inadequate prosthesis of the maxilla, the prosthesis had dropped out repeatedly...
February 7, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29412368/effects-of-orofacial-myofunctional-therapy-on-masticatory-function-in-individuals-submitted-to-orthognathic-surgery-a-randomized-trial
#10
Daniela Galvão de Almeida Prado, Giédre Berretin-Felix, Renata Resina Migliorucci, Mariana da Rocha Salles Bueno, Raquel Rodrigues Rosa, Marcela Polizel, Isadora Ferraz Teixeira, Maria Beatriz Duarte Gavião
OBJECTIVES: The esthetic and functional results of orthognathic surgery of severe dentofacial deformities are predictable, however there are differences regarding the effects on stomatognathic system. The aim was to investigate the effects of orofacial myofunctional therapy (OMT) on the masticatory function in individuals with dentofacial deformity submitted to orthognathic surgery (OGS). MATERIAL AND METHODS: Forty-eight individuals (18-40 years) were evaluated, 14 undergoing OMT (treated group-TG), 10 without this treatment (untreated group-UTG) and 24 in a control group with normal occlusion; for clinical aspects the data of an individual was missed (n=46)...
February 1, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29409690/prevalence-of-nasolacrimal-canal-obstruction-and-epiphora-following-maxillary-orthognathic-surgery
#11
E M Ozcan, G Dergin, S Basa
Acquired injuries of the nasolacrimal apparatus may be the result of craniomaxillofacial surgical procedures, facial trauma, or inflammation. Injury to the nasolacrimal duct system following maxillary orthognathic surgery is rarely reported. This study evaluated the importance of early diagnosis and treatment of epiphora developing after Le Fort I surgery. The records of 83 patients who underwent maxillary orthognathic surgery over a 2-year period were reviewed. The prevalence of postoperative epiphora was 3...
February 3, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29408322/minimally-invasive-versus-standard-approach-in-lefort-1-osteotomy-in-patients-with-history-of-cleft-lip-and-palate
#12
D Séblain, J Bourlet, R H Khonsari, P Roy, A Gleizal, J Chauvel Picard
OBJECTIVE: Compare literature-reported efficiency and complications of the standard maxillary advancement surgery with those of a minimally invasive mucosal approach in patients with CL/P requiring Le Fort 1 osteotomy. DESIGN: Meta-analysis vs. retrospective analysis of 18 consecutive cases. SETTING: Department of maxillofacial surgery at a tertiary-level public general hospital. PARTICIPANTS: The meta-analysis encompassed Medline, Embase, and Cochrane, years 1990 to 2014, inclusive...
February 2, 2018: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29407503/relationship-between-matrilin-1-gene-polymorphisms-and-mandibular-retrognathism
#13
Pranita B Balkhande, Bhaskar V K S Lakkakula, Arun B Chitharanjan
INTRODUCTION: Mandibular retrognathism is a type of malocclusion that refers to an abnormal posterior position of the mandible as a result of a developmental abnormality. From the literature, it is evident that the mandibular growth pattern is determined by the intramembranous ossification of the mandibular body and endochondral ossification of the condyle. Matrilin-1 is a cartilage extracellular matrix protein, and matrilin-1 gene (MATN1) polymorphisms have been found to be involved in dental malocclusions of humans...
February 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29407499/long-term-changes-in-oral-health-related-quality-of-life-of-standard-cleft-and-surgery-patients-after-orthodontic-treatment-a-longitudinal-study
#14
Grace A L Nichols, Joseph S Antoun, Peter V Fowler, Azza H Al-Ani, Mauro Farella
INTRODUCTION: The aim of this study was to assess long-term changes and describe the trajectories of oral health-related quality of life (OHRQoL) in a cohort of cleft, surgery, and standard patients who received orthodontic treatment. METHODS: Standard (n = 16), cleft (n = 19), and orthognathic surgery (n = 22) patients completed the short-form of the Oral Health Impact Profile (OHIP-14) before treatment, immediately posttreatment, and approximately 5 years posttreatment...
February 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29406262/accuracy-of-orthognathic-surgical-outcomes-using-2-and-3-dimensional-landmarks-the-case-for-apples-and-oranges
#15
Alexandre Meireles Borba, Everton José da Silva, André Luis Fernandes da Silva, Michael D Han, Maria da Graça Naclério-Homem, Michael Miloro
PURPOSE: To verify predicted versus obtained surgical movements in 2-dimensional (2D) and 3-dimensional (3D) measurements and compare the equivalence between these methods. MATERIALS AND METHODS: A retrospective observational study of bimaxillary orthognathic surgeries was performed. Postoperative cone-beam computed tomographic (CBCT) scans were superimposed on preoperative scans and a lateral cephalometric radiograph was generated from each CBCT scan. After identification of the sella, nasion, and upper central incisor tip landmarks on 2D and 3D images, actual and planned movements were compared by cephalometric measurements...
January 12, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29402731/electromagnetic-navigated-condylar-positioning-after-high-oblique-sagittal-split-osteotomy-of-the-mandible-a-guided-method-to-attain-pristine-temporomandibular-joint-conditions
#16
Moritz Berger, Igor Nova, Sebastian Kallus, Oliver Ristow, Urs Eisenmann, Hartmut Dickhaus, Michael Engel, Christian Freudlsperger, Jürgen Hoffmann, Robin Seeberger
OBJECTIVES: Reproduction of the exact preoperative proximal-mandible position after osteotomy in orthognathic surgery is difficult to achieve. This clinical pilot study evaluated an electromagnetic (EM) navigation system for condylar positioning after high-oblique sagittal split osteotomy (HSSO). STUDY DESIGN: After HSSO as part of 2-jaw surgery, the position of 10 condyles was intraoperatively guided by an EM navigation system. As controls, 10 proximal segments were positioned by standard manual replacement...
December 29, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/29398864/laser-assisted-lip-repositioning-surgery-novel-approach-to-treat-gummy-smile
#17
Sana Farista, Ramreddy Yeltiwar, Butchibabu Kalakonda, Kaustubh Suresh Thakare
Excessive gingival display (EGD) resulting in a "gummy smile" is a major esthetic concern with ramifications in an individual's personal and social life. Numerous treatment modalities have been used for the correction of EGD. The present case report describes the successful treatment of a young woman with an excess gingival display caused by a hyperactive upper lip and a mild vertical maxillary excess that was treated with a laser-assisted lip repositioning surgical technique accompanied by gingival recontouring...
March 2017: Journal of Indian Society of Periodontology
https://www.readbyqxmd.com/read/29398172/an-innovative-virtual-reality-training-tool-for-orthognathic-surgery
#18
Y Pulijala, M Ma, M Pears, D Peebles, A Ayoub
Virtual reality (VR) surgery using Oculus Rift and Leap Motion devices is a multi-sensory, holistic surgical training experience. A multimedia combination including 360° videos, three-dimensional interaction, and stereoscopic videos in VR has been developed to enable trainees to experience a realistic surgery environment. The innovation allows trainees to interact with the individual components of the maxillofacial anatomy and apply surgical instruments while watching close-up stereoscopic three-dimensional videos of the surgery...
February 1, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29398097/3d-printing-in-orthognathic-surgery-a-literature-review
#19
REVIEW
Hsiu-Hsia Lin, Daniel Lonic, Lun-Jou Lo
With the recent advances in three-dimensional (3D) imaging, computer-assisted surgical planning and simulation are now regularly used for analysis of craniofacial structures and improved prediction of surgical outcomes in orthognathic surgery. A variety of patient-specific surgical guides and devices have been designed and manufactured using 3D printing technology, which rapidly gained widespread popularity to improve the outcomes. The article presents an overview of 3D printing technology for state-of-the-art application in orthognathic surgery and discusses the impacts on treatment feasibility and patient outcome...
February 2, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/29390018/facial-esthetics-and-the-assignment-of-personality-traits-before-and-after-orthognathic-surgery-rated-on-video-clips
#20
Klaus Sinko, Reinhold Jagsch, Claudio Drog, Wilhelm Mosgoeller, Arno Wutzl, Gabriele Millesi, Clemens Klug
Typically, before and after surgical correction faces are assessed on still images by surgeons, orthodontists, the patients, and family members. We hypothesized that judgment of faces in motion and by naïve raters may closer reflect the impact on patients' real life, and the treatment impact on e.g. career chances. Therefore we assessed faces from dysgnathic patients (Class II, III and Laterognathia) on video clips. Class I faces served as anchor and controls. Each patient's face was assessed twice before and after treatment in changing sequence, by 155 naïve raters with similar age to the patients...
2018: PloS One
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