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Cephalometry

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https://www.readbyqxmd.com/read/28686091/correlation-between-the-position-of-hyoid-bone-and-subregions-of-the-pharyngeal-airway-space-in-lateral-cephalometry-and-cone-beam-computed-tomography
#1
Eliana Dantas da Costa, Gina Delia Roque-Torres, Danieli Moura Brasil, Frab Noberto Bóscolo, Solange Maria de Almeida, Glaucia Maria Bovi Ambrosano
OBJECTIVE: To correlate the pharyngeal airway subregions with the positioning of the hyoid bone. MATERIAL AND METHODS: The study examined 107 lateral cephalometric (LC) and cone beam computed tomography (CBCT) images. Linear and volumetric measurements of the pharyngeal subregions were made and correlated to linear measurements using hyoid triangle analysis on images of LC and multiplanar (MPR) and three-dimensional (3D) reconstructions of CBCT. RESULTS: There was significant correlation between linear measurements of the pharyngeal subregions and hyoid bone position in LC images and in MPR and 3D reconstructions of the CBCT...
July 7, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28648911/influence-of-bimaxillary-surgery-on-pharyngeal-airway-in-class-iii-deformities-and-effect-on-sleep-apnea-a-stop-bang-questionnaire-and-cone-beam-computed-tomography-study
#2
Narayan H Gandedkar, Chai Kiat Chng, Yong Chen Por, Vincent Kok Leng Yeow, Andrew Tjin Chiew Ow, Tian Ee Seah
PURPOSE: To evaluate pharyngeal airway space (PAS; nasopharyngeal, oropharyngeal, and total airway) volume and the correlation of an obstructive sleep apnea (OSA) and hypopnea syndrome screening questionnaire (STOP-BANG) with various mandibular setbacks during bimaxillary surgery and compare these findings with an age- and gender-matched skeletal Class I control group. PATIENTS AND METHODS: This retrospective cohort study was composed of patients with skeletal Class III discrepancy who underwent bimaxillary jaw surgery and were assessed with STOP-BANG score, cephalometry, and cone-beam computed tomography (of the PAS)...
June 1, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28617407/-efficiency-of-cephalometry-in-orthodontic-treatment-planning-cephalometric-parameters-and-their-age-related-changes
#3
O I Arsenina, K M Shishkin, M K Shishkin, N V Popova
The aim of the study was to evaluate the efficiency of cephalometry in orthodontic treatment planning in patients with teeth crowding and Angle Class I molars relation. Cephalometric parameters were analyzed in 70 patients that completed orthodontic treatment in 'Orthodont' dental clinic (Samara). Cephalometric X-rays were taken at baseline examination and after treatment. In patients with crowding and Class I molars relationship treated with extraction of all four first premolars correlation between N-Se and mandibular and maxillary length was disturbed...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28607957/analysis-of-patient-outcomes-following-proton-radiation-therapy-for-retinoblastoma
#4
Kent W Mouw, Beow Y Yeap, Paul Caruso, Aaron Fay, Madhusmita Misra, Roshan V Sethi, Shannon M MacDonald, Yen-Lin Chen, Nancy J Tarbell, Torunn I Yock, Suzanne K Freitag, John E Munzenrider, Eric Grabowski, Michelle Katz, Karen Kuhlthau, Dawn DeCastro, Gena Heidary, Jessica Ciralsky, Shizuo Mukai, Helen A Shih
PURPOSE: Proton radiotherapy (PRT) is used in the treatment of retinoblastoma (RB) and has the potential to minimize exposure of normal tissue to radiation and thus decrease risk of toxicity and second malignancies. However, comprehensive analyses of long-term patient outcomes are not available. METHODS: RB patients treated with PRT at our institution between 1986 and 2012 were invited to return for participation in a study designed to assess long-term outcomes...
January 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28565862/preliminary-evaluation-of-cone-beam-computed-tomography-in-three-dimensional-cephalometry-for-clinical-application
#5
Na Li, Bo Hu, Fanglin Mi, Jinlin Song
The present study was conducted to evaluate the three-dimensional (3D) cephalometry accuracy of cone-beam computed tomography (CBCT). A total of 40 newly diagnosed orthodontic patients (including 18 males and 22 females; age range, 12-18 years) were subjected to CBCT scanning and X-ray imaging in order to obtain lateral cephalograms. The 3D CBCT cephalograms were reconstructed and measured with in vivo 5.1 software, and compared with the results from the conventional 2D lateral cephalograms. Measurements in the two images were performed twice using the Steiner and Tweed standards and a single analyzer paired t-test was used to analyze the differences between the two cephalometric methods...
May 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28562535/the-structural-changes-of-upper-airway-and-newly-developed-sleep-breathing-disorders-after-surgical-treatment-in-class-iii-malocclusion-subjects
#6
Ui Lyong Lee, Hoon Oh, Sang Ki Min, Ji Ho Shin, Yong Seok Kang, Won Wook Lee, Young Eun Han, Young Jun Choi, Hyun Jik Kim
Bimaxillary surgery is the traditional treatment of choice for correcting class III malocclusion which is reported to cause an alteration of oropharyngeal structures and upper airway narrowing that might be a predisposing factor for obstructive sleep apnea (OSA). This study aimed to analyze sleep parameters in class III malocclusion subjects and ascertain the prevalence of snoring or OSA following bimaxillary surgery.A total of 22 patients with Le Fort I osteotomy and mandibular setback for class III malocclusion were prospectively enrolled...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28526831/selection-of-a-horizontal-reference-plane-in-3d-evaluation-identifying-facial-asymmetry-and-occlusal-cant-in-orthognathic-surgery-planning
#7
Daniel Lonic, Ali Sundoro, Hsiu-Hsia Lin, Pei-Ju Lin, Lun-Jou Lo
Facial asymmetry and dental occlusal cant have been detected in two-dimensional cephalometry using different horizontal reference lines, but equivalent 3-dimensional (3D) reference planes have not been thoroughly investigated. In this study, 3D cone-beam computed tomography scans of 83 consecutive patients were evaluated using a standardized 3D frame and three horizontal reference planes, Supraorbitale (Sor), Frontozygomatic (Z), and Frankfurt horizontal (FH) for cant detection. Canting was defined as a vertical difference between left and right sides of 2 mm or more, and in at least two investigated planes...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28468143/cephalometric-analysis-of-modifications-of-the-mandible-due-to-reduction-mandibuloplasty-in-patients-with-prominent-mandibular-angle
#8
Guoping Wu, Minkai Xie, Chunbing Hu, Bin Zhou, Hao Dai, Wenwen Zhang
Cephalometry has been used to measure hard and soft facial tissues as well as to conduct the ostectomy to determine the characteristics of the prominent mandibular angles (PMA). The changes produced on the mandibles by reduction mandibuloplasty are not known. The objective of the present study was to identify by cephalometric analysis the anatomical changes of the mandibles that occur in patients with PMA after reduction mandibuloplasty. Forty-two patients with PMA were submitted to cephalometric analysis before, 1 week and 6 months after surgery to evaluate the changes of the mandibles produced by reduction mandibuloplasty...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28365079/a-lateral-cephalometry-study-of-patients-with-neurofibromatosis-type-1
#9
Reinhard E Friedrich, Jan-Marten Lehmann, Jonathan Rother, Georg Christ, Christine Zu Eulenburg, Hannah T Scheuer, Hanna A Scheuer
PURPOSE: Neurofibromatosis type 1 (NF1) is an autosomal dominant transmitted tumour suppressor syndrome and also a bone disease. Osseous dysplasia affecting the craniofacial region is characteristic of NF1. The aim of this study was to analyse the lateral cephalograms of NF1 patients in comparison to individuals who were not affected by this condition in order to describe the skeletal phenotype of NF1 in more detail. MATERIALS AND METHODS: The study comprises the lateral cephalograms of 172 patients with established NF1 diagnoses (female = 85, male = 87)...
February 20, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28337564/lower-face-cephalometry-based-on-quadrilateral-analysis-with-cone-beam-computed-tomography-a-clinical-pilot-study
#10
Adrienn Dobai, Tamás Vizkelety, Zsolt Markella, Adrienne Rosta, Ágnes Kucsera, József Barabás
OBJECTIVE: As most orthognathic surgeries focus on the lower face, the aim of this study was to transfer previously developed two-dimensional cephalometry-which is useful for surgeons in the orthognathic surgery of the lower face-to three-dimensional (3D) cephalometry by using cone-beam computed tomography (CBCT). We selected the quadrilateral lower face analysis developed by the surgeon Di Paolo, who focused only for the lower face and mentioned that data in millimeters are more easy to use than angles for surgeons...
June 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28321987/cephalometric-findings-among-children-with-velopharyngeal-dysfunction-following-adenoidectomy-a-retrospective-study
#11
F Kassem, Y Ebner, B Nageris, N Watted, A DeRowe, A Nachmani
OBJECTIVES: To characterise the craniofacial structure by cephalometry, especially the skull base and nasopharyngeal space, in children who underwent adenoidectomy and developed persistent velopharyngeal dysfunction (VPD). DESIGN: Retrospective study. SETTING: Speech and swallowing clinic of a single academic hospital. PARTICIPANTS: Thirty-nine children with persistent VPD following adenoidectomy (mean age 8.0±3.6 years) and a control group of 80 healthy children...
March 21, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28271360/evaluation-of-the-influence-of-patient-positioning-on-the-reliability-of-lateral-cephalometry
#12
Ovidiu-Tiberiu David, Robert-Angelo Tuce, Oana Munteanu, Adrian Neagu, Irinel Panainte
Two-dimensional cephalometry is widely used for monitoring orthodontic treatments and for quantifying the outcome of maxillofacial surgery. Despite careful use of a cephalostat, successive radiographs might differ due to slight differences in patient posture. This study evaluates the reliability of lateral cephalometric measurements and estimates the impact of patient positioning on this reliability. We studied cephalograms of 104 patients; 31 of them had two radiographs because the first was deemed unsuitable for cephalometric analysis...
July 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28235540/determination-of-the-diagnostic-value-of-the-modified-mallampati-score-upper-lip-bite-test-and-facial-angle-in-predicting-difficult-intubation-a-prospective-descriptive-study
#13
Ata Mahmoodpoor, Hassan Soleimanpour, Samad Ej Golzari, Arezoo Nejabatian, Tannaz Pourlak, Masoumeh Amani, Saeed Hajmohammadi, Hamzeh Hosseinzadeh, Robab Mehdizadeh Esfanjani
BACKGROUND: Difficult intubation is a significant cause of mortality and morbidity related to anesthesia. We decided to evaluate the value of Modified Mallampati Score, Upper Lip Bite Test and Facial Angle in the prediction of difficult intubation. METHODS: In a prospective descriptive study, data from 132 patients who were candidates for elective maxillofacial surgeries under general anesthesia were gathered. Facial Angles were measured by a maxillofacial surgeon according to cephalometry...
February 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28224280/predictors-of-success-in-combination-of-tongue-base-resection-and-lateral-pharyngoplasty-for-obstructive-sleep-apnea
#14
Chi Sang Hwang, Jin Won Kim, Sang Chul Park, Hyo Jin Chung, Chang-Hoon Kim, Joo-Heon Yoon, Hyung-Ju Cho
The base of the tongue has been recognized as a significant site of obstruction in patients with obstructive sleep apnea (OSA). Our aim was to determine the independent predictors of surgical success in tongue base resection combined with lateral pharyngoplasty for OSA. Thirty-one OSA patients who underwent endoscopie-guided coblator or transoral robotic tongue base resection in combination with lateral pharyngoplasty for the treatment of retroglossal obstruction between March 2012 and December 2015 were enrolled in this study...
May 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28129408/contribution-of-fgfr1-variants-to-craniofacial-variations-in-east-asians
#15
Mohamed Adel, Tetsutaro Yamaguchi, Daisuke Tomita, Takatoshi Nakawaki, Yong-Il Kim, Yu Hikita, Shugo Haga, Masahiro Takahashi, Mohamed A Nadim, Akira Kawaguchi, Mutsumi Isa, Walid H El-Kenany, Abbadi A El-Kadi, Soo-Byung Park, Hajime Ishida, Koutaro Maki, Ryosuke Kimura
FGFR1 plays an important role in the development of the nervous system as well as the regulation of the skeletal development and bone homeostasis. Mutations in FGFR1 genes affect skull development, specifically suture and synchondrosis, resulting in craniosynostosis and facial abnormalities. We examined subjects with normal skull morphology for genetic polymorphisms that might be associated with normal craniofacial variations. Genomic DNA was obtained from 216 Japanese and 227 Korean subjects. Four FGFR1 SNPs, namely, rs881301, rs6996321, rs4647905, and rs13317, were genotyped...
2017: PloS One
https://www.readbyqxmd.com/read/28118195/cephalometric-analysis-of-modifications-of-the-mandible-due-to-reduction-mandibuloplasty-in-patients-with-prominent-mandibular-angle
#16
Guoping Wu, Minkai Xie, Chunbing Hu, Bin Zhou, Hao Dai, Wenwen Zhang
Cephalometry has been used to measure hard and soft facial tissues as well as to conduct the ostectomy to determine the characteristics of the prominent mandibular angles (PMA). The changes produced on the mandibles by reduction mandibuloplasty are not known. The objective of the present study was to identify by cephalometric analysis the anatomical changes of the mandibles that occur in patients with PMA after reduction mandibuloplasty. Forty-two patients with PMA were submitted to cephalometric analysis before, 1 week and 6 months after surgery to evaluate the changes of the mandibles produced by reduction mandibuloplasty...
January 23, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28097213/fully-automated-quantitative-cephalometry-using-convolutional-neural-networks
#17
Sercan Ö Arık, Bulat Ibragimov, Lei Xing
Quantitative cephalometry plays an essential role in clinical diagnosis, treatment, and surgery. Development of fully automated techniques for these procedures is important to enable consistently accurate computerized analyses. We study the application of deep convolutional neural networks (CNNs) for fully automated quantitative cephalometry for the first time. The proposed framework utilizes CNNs for detection of landmarks that describe the anatomy of the depicted patient and yield quantitative estimation of pathologies in the jaws and skull base regions...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28062177/maxillomandibular-advancement-for-obstructive-sleep-apnea-syndrome-treatment-long-term-results
#18
Aurélie Vigneron, Renaud Tamisier, Emmanuelle Orset, Jean-Louis Pepin, Georges Bettega
PURPOSE: We evaluated the long term effectiveness of maxillomandibular advancement (MMA) for OSAS treatment patients. This retrospective study reviewed the patients treated by MMA for OSAS between 1995 and 2009. They were evaluated by complete polysomnography, cephalometry and quality of life questionnaire. The minimum follow up was 3 years. Success rate was defined by an IAH <10 with at least a 50% reduction. MATERIAL AND METHODS: 88 patients had MMA during this period...
December 7, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28004246/reproducibility-of-three-dimensional-posterior-cranial-base-angles-using-low-dose-computed-tomography
#19
R Olszewski, L Frison, N Schoenarts, R H Khonsari, G A Odri, F Zech, H Reychler
OBJECTIVES: One of the key aspects of three-dimensional (3D) craniofacial cephalometry is the measurement of posterior cranial base angle as this area is deeply involved in craniofacial development. The purpose of our retrospective study was to define the best reproducible 3D posterior cranial base angles among five 3D angles transposed from 2D cephalometry (Cousin, BL1 of Ross and Ravosa, Bjork, Delaire, CBA4 of Liberman) and seven 3D angles based on physical anthropology studies and on new concepts (R1 to R7)...
December 21, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27858070/-evaluation-of-the-maxillary-basal-bone-and-molar-change-of-skeletal-class-ii-malocclusion-treated-by-sagittal-guidance-twin-block
#20
Ying-Yu Yi, Ning Zhao, Gang Shen
PURPOSE: To investigate the effects of sagittal-guidance Twin-block appliance on maxillary basal bone and buccal segment distalization in developing Angle Class II division 1 malocclusion. METHODS: The measurement data of anterior-posterior direction and vertical dimension between pretherapy and post-treatment, including 34 developing Angle Class II division 1 patients with sagittal-guidance Twin-block and non-extraction treatment, were quantitatively analyzed by X-ray cephalometry and Pancherz...
August 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
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