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Mandibular osteotomy

Risa Usumi-Fujita, Koichi Nakakuki, Koichi Fujita, Machiko Kosugi, Ikuo Yonemitus, Eiji Fukuyama, Takashi Ono
Facial asymmetry can be caused by unilateral condylar hyperplasia. In such cases, it may be difficult to achieve symmetry since there is dentoalveolar compensation on the affected side, and the occlusal cant does not correspond to the frontal mandibular deviation. In the case presented, surgical orthodontic treatment and orthognathic surgery planning was accomplished for a patient with facial asymmetry due to condylar hyperplasia. The surgical plan was devised with particular attention to the severe dentoalveolar compensation...
March 21, 2018: Angle Orthodontist
Ying-Hua Zhao, Shi-Jian Zhang, Zi-Hui Yang, Xiao-Chang Liu, De-Lin Lei, Jing Li, Lei Wang
Distraction osteogenesis is an important technique for the treatment of maxillofacial abnormities and defects. However, distraction osteogenesis may cause the injury of the inferior alveolar nerve. The relationship between distraction rate and nerve degeneration-regeneration shift remains poorly understood. In this study, 24 rabbits were randomly divided into four groups. To establish the rabbit mandibular distraction osteogenesis model, the mandibles of rabbits in distraction osteogenesis groups were subjected to continuous osteogenesis distraction at a rate of 1...
February 2018: Neural Regeneration Research
Artur Fahradyan, Erik M Wolfswinkel, Noreen Clarke, Stephen Park, Michaela Tsuha, Mark M Urata, Jeffrey A Hammoudeh, Dennis-Duke R Yamashita
BACKGROUND: The maxillary horizontal relapse following Le Fort I advancement has been estimated to be 10% to 50%. This retrospective review examines the direct association between the amounts of maxillary advancement and relapse. We hypothesize that the greater the advancement, the greater the relapse amount. METHOD: Patients with class III skeletal malocclusion underwent maxillary advancement with either a Le Fort I or a Le Fort I with simultaneous mandibular setback (bimaxillary surgery) from 2008 to 2015...
April 2018: Cleft Palate-craniofacial Journal
Stanley Yung-Chuan Liu, Douglas Sidell, Leh-Kiong Huon, Carlos Torre
Large, benign intramandibular lesions are frequently removed by resection followed by extensive free tissue transfer or delayed bone grafting. We outline a protocol to remove benign mandibular lesions using sagittal split osteotomy (SSO) with virtual surgical planning (VSP) to mitigate risks involved with this effective, tissue-saving approach. Patients with benign mandibular lesions accessed by SSO with VSP during 2014 were included in this study. Computed tomographic data were imported into VSP software. Using VSP, the exact locations of mandibular lesions and the inferior alveolar nerve canal were delineated...
March 2018: Ear, Nose, & Throat Journal
Akihiro Koba, Ryuichiro Tanoue, Shogo Kikuta, Shingo Hirashima, Yoshihiro Miyazono, Jingo Kusukawa
Mandibular osteotomy carries with it a risk of damaging blood vessels and nerves when using traditional surgical techniques. Piezosurgery® , is a new technique that uses ultrasonic vibration to enable bone-selective sectioning without damage to the surrounding soft tissues. However, paralysis may not be completely eliminated using Piezosurgery® for osteotomy. We investigated how piezoelectric surgery in bilateral sagittal splitting ramus osteotomy (BSSRO) affected the surrounding soft tissue. Forty-four patients with skeletal mandibular prognathism underwent mandibular setback with BSSRO...
March 16, 2018: Kurume Medical Journal
Koichiro Ueki, Akinori Moroi, Takamitsu Tsutsui, Ryota Hiraide, Akihiro Takayama, Yuki Saito, Momoko Sato, Nana Baba, Tatsuya Tsunoda, Asami Hotta, Kunio Yoshizawa
PURPOSE: The purpose of this study was to compare time-course changes in temporomandibular joint (TMJ) space between mandibular advancement surgery and setback surgery after sagittal split ramus osteotomy (SSRO) and Le Fort I osteotomy. SUBJECTS AND METHODS: The subjects were 46 patients (92 joints) who underwent bi-maxillary surgery. The TMJ disc position was assessed by magnetic resonance imaging (MRI) and the anterior, superior, posterior, medial and lateral joint spaces were assessed by computed tomography (CT), preoperatively and at 1 week and 1 year postoperative...
February 9, 2018: Journal of Cranio-maxillo-facial Surgery
Valthierre Nunes de Lima, Leonardo Perez Faverani, Joel Ferreira Santiago, Celso Palmieri, Osvaldo Magro Filho, Eduardo Piza Pellizzer
The purpose of this study was to perform a systematic review of morphological alterations in the condyles after orthographic surgery involving a sagittal split ramus osteotomy (SSRO), with or without surgery on the maxilla. Searches were performed on three databases and registered in the PROSPERO. The selected studies fulfilled the criteria established by the following PICO model: (1) population: individuals with skeletal dentofacial deformities (class II or III facial patterns), without asymmetry; (2) intervention: orthognathic surgery for mandibular setback using an SSRO, with or without a Le Fort I osteotomy, and fixed with bicortical screws or plates and screws; (3) comparison: orthognathic surgery for mandibular advancement using an SSRO, with or without a Le Fort I osteotomy, and fixed with plates and screws or bicortical screws; and (4) outcome: condylar resorption rate and relapse...
February 21, 2018: Journal of Cranio-maxillo-facial Surgery
Thomas Hanser, Romain Doliveux
PURPOSE: The aim of this randomized prospective split-mouth clinical trial was to evaluate the outcome of bone block harvesting from the retromolar region using the MicroSaw and Piezosurgery. MATERIALS AND METHODS: Fifty-three patients for extensive bilateral bone grafting procedures with or without concomitant implant placement in the maxilla and/or mandible were scheduled. In each patient, bone blocks were harvested in the retromolar area within the external oblique ridge of the mandible...
March 2018: International Journal of Oral & Maxillofacial Implants
Keisuke Sugahara, Yoshiharu Katsumi, Masahide Koyachi, Yu Koyama, Satoru Matsunaga, Kento Odaka, Shinichi Abe, Masayuki Takano, Akira Katakura
Background: Along with the advances in technology of three-dimensional (3D) printer, it became a possible to make more precise patient-specific 3D model in the various fields including oral and maxillofacial surgery. When creating 3D models of the mandible and maxilla, it is easier to make a single unit with a fused temporomandibular joint, though this results in poor operability of the model. However, while models created with a separate mandible and maxilla have operability, it can be difficult to fully restore the position of the condylar after simulation...
December 2018: Maxillofacial Plastic and Reconstructive Surgery
Abdullah Tahir Şensoy, Irfan Kaymaz, Ümit Ertaş, Ali Kiki
PURPOSE: The purpose of this study is to suggest a patient-specific osteotomy line to optimize the distractor position and thus to minimize the disadvantages of conventional mandibular distraction osteogenesis (MDO) protocols. In addition, this study also aims to compare the conventional MDO protocols with the new MDO protocol proposed in this study in terms of both orthodontic outcomes and mechanical effects of osteotomy level on callus stabilization by means of the finite element method...
March 8, 2018: Journal of Craniofacial Surgery
Hina Rashid, Azmina Hussain, Abdul Hafeez Sheikh, Kehkishan Azam, Sofia Malik, Muhammad Amin
BACKGROUND: Dento-alveolar surgical procedures involving third molar teeth are the most common surgical procedure in the field of surgery. The objective of this research was to analyse the impact of surgery on the incidence of alveolar osteitis after surgical removal of mandibular third molar and to compare two different bone cutting methods following impacted mandibular third molar surgery.. METHODS: This double blinded randomized clinical trial was executed at the OPD of Department of Oral and Maxillofacial Surgery, Dow University of Health Sciences, Karachi...
January 2018: Journal of Ayub Medical College, Abbottabad: JAMC
Kaori Takahashi, Daisuke Nishizawa, Shinya Kasai, Yoshihiko Koukita, Ken-Ichi Fukuda, Tatsuya Ichinohe, Kazutaka Ikeda
Opioid analgesics are widely used for the treatment of moderate to severe pain. The analgesic effects of opioids are well known to vary among individuals. The present study focused on the genetic factors that are associated with interindividual differences in pain and opioid sensitivity. We conducted a multistage genome-wide association study in subjects who were scheduled to undergo mandibular sagittal split ramus osteotomy and were not medicated until they received fentanyl for the induction of anesthesia...
February 16, 2018: Journal of Pharmacological Sciences
Walid El Kininy, Shane Davy, Leo Stassen, Denis Stephen Barry
Variations in the relationship of the retromandibular vein to the facial nerve have been widely reported due to their relevance for surgical approaches in parotid, osteotomy and mandibular condyle surgery. In the context of the retromandibular retroparotid approach, remaining deep to the retromandibular vein is advised to decrease the likelihood of encountering the facial nerve during mandibular condyle surgery. In the present report, an unusual variant of the superficial temporal vein lying superficial to the facial nerve is described...
March 3, 2018: Folia Morphologica (Warsz)
Yoko Kawase-Koga, Kaoru Shibata, Akira Kimoto, Masato Watanabe, Daichi Chikazu
Sagittal split ramus osteotomy and intraoral vertical ramus osteotomy are commonly performed for the correction of jaw deformities. However, during mandibular orthognathic surgeries such as sagittal split ramus osteotomy and intraoral vertical ramus osteotomy , the authors sometimes encounter exposure of the buccal fat pad (BFP), which decreases the surgical field. The exposed BFP makes it difficult to perform these operations, may result in unexpected complications, and may increase the operation time. Therefore, the authors herein describe a simple, safe, and convenient technique for reducing the volume of the exposed BFP during mandibular orthognathic surgery using an electric knife in the coagulation mode...
February 27, 2018: Journal of Craniofacial Surgery
Miki Watanabe, Akira Watanabe, Nobuo Takano, Chikara Saito, Takahiko Shibahara
OBJECTIVE: The present study aimed to determine the structure and morphology of the maxilla in patients with cleft lip and palate to ensure safe Le Fort I osteotomy. PATIENTS: A total of 34 sides of 17 patients with unilateral cleft lip and palate (nonsyndromic cases) were included in this study. The control group included 10 sides of 5 patients who exhibited skeletal mandibular protrusion without malformation. METHODS: Finite element analysis was performed to examine the distribution of occlusal force over the maxilla, and continuous 3-dimensional measurement was performed at the sites of stress concentration...
January 1, 2018: Cleft Palate-craniofacial Journal
Hongbo Chen, Jiaming Sun, Jiecong Wang
BACKGROUND: Several methods are available for mandibular reduction, and each method is characterized by unique limitations and complications. However, only a few studies have systematically analyzed these complications. This study aimed to investigate the effects of the outcome of performing curved mandibular angle ostectomy and outer cortex grinding in 1-stage operation and to examine the causes of different types and characteristics of complications. METHODS: The subjects consisted of 528 patients who were subjected to curved mandibular angle ostectomy and outer cortex grinding in 1-stage operation through an intraoral approach...
February 23, 2018: Annals of Plastic Surgery
Hamid Neshandar Asli, Zahra Dalili Kajan, Fatemeh Gholizade
STATEMENT OF PROBLEM: Cement-retained implant-supported restorations have advantages over screw-retained restorations but are difficult to retrieve. Identifying the approximate location of the screw access hole (SAH) may reduce damage to the prosthesis. PURPOSE: The purpose of this in vitro study was to evaluate the ability of cone beam computed tomography (CBCT) imaging to determine the location and direction of SAHs in cement-retained implant prostheses. MATERIAL AND METHODS: Five clear acrylic resin casts were made based on a mandibular model...
February 21, 2018: Journal of Prosthetic Dentistry
Max J H Witjes, Rutger H Schepers, Joep Kraeima
PURPOSE OF REVIEW: This review describes the advances in 3D virtual planning for mandibular and maxillary reconstruction surgical defects with full prosthetic rehabilitation. The primary purpose is to provide an overview of various techniques that apply 3D technology safely in primary and secondary reconstructive cases of patients suffering from head and neck cancer. RECENT FINDINGS: Methods have been developed to overcome the problem of control over the margin during surgery while the crucial decision with regard to resection margin and planning of osteotomies were predetermined by virtual planning...
April 2018: Current Opinion in Otolaryngology & Head and Neck Surgery
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
Johannes T M van Gemert, Jan H Abbink, Robert J J van Es, Antoine J W P Rosenberg, Ron Koole, Ellen M Van Cann
BACKGROUND AND OBJECTIVES: Evaluation of mandibular reconstructions with free fibula flaps. Identification of factors associated with major recipient site complications, that is, necessitating surgical intervention under general anaesthesia. METHODS: Seventy-nine reconstructions were included. The following factors were analyzed: fixation type, number of osteotomies, site of defect (bilateral/unilateral), surgeon, sex, ASA classification, continuous smoking, pathological N-stage, age, defect size, flap ischemic time, and postoperative radiotherapy...
February 15, 2018: Journal of Surgical Oncology
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