scholarly journals CBCT INVESTIGATION OF THE INTRABONY CANAL COMMUNICATIONS BETWEEN THE VESTIBULAR AND LINGUAL PLATES IN THE ANTERIOR MANDIBLE

2020 ◽  
Vol 26 (4) ◽  
pp. 3394-3397
Author(s):  
Dimitar Yovchev ◽  
◽  
Hristina Mihaylova ◽  
Elitsa Deliverska ◽  
Nadezhda Miteva - Yovcheva ◽  
...  
Keyword(s):  
Mandibular Canal ◽  
Incisive Canal ◽  
Implant Placement ◽  
Anterior Loop ◽  
Kappa Value ◽  
The Right ◽  
Type 3 ◽  
Anterior Mandible ◽  
Lingual Canal

Purpose: To assess the presence of the vestibulo - lingual intrabony canal communications (VLC) in the anterior mandible using cone beam computed tomography (CBCT). Materials and methods: Study material included 200 CBCT scans taken for preoperative planning of implant placement. The images were examined carefully by three observers concerning the presence of VLC. Interobserver agreement in identification of the canal communications was excellent (mean kappa value – 0.82). Results: Vestibulo - lingual communications were found in 27 % of cases. The communications appeared as a crossing of the lateral lingual canal with the mandibular incisive canal (type 1), as a connection between midline lingual canal (or canals) and a vestibular nutrient canal (type 2) or as a lateral lingual canal connected with the anterior loop of the mandibular canal (type 3). The main type of VLC is those between a lateral lingual canal and mandibular incisive canal – 85.2% from all of the VLCs. Conclusions: A considerable part (27%) of Bulgarian citizens has vestibulo - lingual communications in the anterior mandible. The type 1 communication prevails, and it is more frequently located on the right side. The knowledge about vestibulo - lingual communications could contribute a better understanding of bone tumor invasion but further studies are necessary.

scholarly journals Assessment of Anterior Loop of Inferior Alveolar Nerve and Its Anatomic Variations with Age, Gender, and Dentition Status in Indian Population: A CBCT Study

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Anjali Gupta ◽  
Sandeep Kumar ◽  
Siddharth Kumar Singh ◽  
Arunoday Kumar ◽  
Abhishek Gupta ◽  
...  
Keyword(s):  
3D Imaging ◽  
Indian Population ◽  
Inferior Alveolar Nerve ◽  
Implant Placement ◽  
Anterior Loop ◽  
The Mean ◽  
The Right ◽  
Measuring Tool ◽  
Type 3

Background. The posterior region of the mandible is more often related to iatrogenic errors, but the interforaminal region is also not spared for neurovascular complications. This study aimed to use CBCT images to evaluate the prevalence of anterior nerve looping and its variations with age, gender, and dentition status. Methods. This retrospective study was carried out by studying 600 CBCT scans retrieved from archival records of a CBCT center in Lucknow. The scans were inspected by two trained investigators. The length of the anterior loop was measured using the measuring tool of Carestream 3D imaging software. Descriptive and analytical tests were performed. Results. The prevalence of the anterior loop of the inferior alveolar nerve was found to be 56%. The prevalence was found to be more on the right side (29.0%) compared to the left side (27.0%). The most common anterior looping of the inferior alveolar nerve was type 3 followed by type 1. Males were found to have significantly higher loops compared to females. The number of loops was found to decrease significantly with age. The mean length of the loop was found to vary from 1.14 to 1.61 mm. Conclusion. The anterior looping of IAN is very much prevalent in the Lucknow population. The use of the CBCT technique and appropriate preplanning prior to surgery or implant placement should be performed to prevent nerve injury.

Cone-Beam Computed Tomography Analysis of the Prevalence, Length, and Passage of the Anterior Loop of the Mandibular Canal

2019 ◽  
Vol 45 (6) ◽  
pp. 463-468 ◽  
Author(s):  
Navin Raju ◽  
Wenjian Zhang ◽  
Aniket Jadhav ◽  
Andreas Ioannou ◽  
Sridhar Eswaran ◽  
...  
Keyword(s):  
Alveolar Bone ◽  
Mandibular Canal ◽  
Mental Foramen ◽  
Cone Beam ◽  
Average Height ◽  
Cross Sectional ◽  
Implant Placement ◽  
Anterior Loop ◽  
Cone Beam Computerized Tomography ◽  
Anterior Mandible

When placing implants in the anterior mandible, it is important to avoid damaging the mandibular nerve and its terminal extensions. The objective of this study was to determine the prevalence, length, and passage of the anterior loop of the mandibular canal, as well as the quantity of alveolar bone that is coronal to the canal, to help with implant placement in the anterior mandible. Cone-beam computerized tomography (CBCT) scans of 124 patients with 248 hemi-sections were evaluated. Anterior loop prevalence was determined using reconstructed panoramic and cross-sectional views; length was measured as the distance between the most mesial aspect of the mental foramen to the most mesial aspect of the anterior loop on cross-sectional views. The bucco-lingual position of the anterior loop inside the mandible and the apico-coronal dimensions of the alveolar bone above it were measured on cross-sectional views to determine the passage of the anterior loop and the bone available coronally, respectively. The effects of sex, age, side, and dentate status on the prevalence and length of the anterior loop were analyzed statistically. Prevalence of the anterior loop at the patient and hemi-section levels was 25% and 24%, respectively, and its median length was 1.63 mm (range, 0.52–3.92 mm). The anterior loop was apical to the mental foramen and mostly located within the buccal or middle one-third of the alveolar ridge, with an average height of coronal alveolar bone of 17.12 mm. Sex, age, side, and dentate status did not affect anterior loop prevalence and length. In conclusion, because of great variation, a case-by-case CBCT evaluation of the anterior loop is necessary before placing implants in the anterior mandible.

scholarly journals Evaluation of the Mandibular Incisive Canal by Panoramic Radiography and Cone-Beam Computed Tomography

2018 ◽  
pp. 1-13
Author(s):  
Pablo E Tauber ◽  
Virginia Mansilla ◽  
Pedro Brugada ◽  
Sara S Sánchez P ◽  
Stella M Honoré ◽  
...  
Keyword(s):  
Right Ventricular Outflow Tract ◽  
Ventricular Outflow Tract ◽  
Qrs Complex ◽  
Incisive Canal ◽  
St Segment Elevation ◽  
Longitudinal Plane ◽  
St Segment ◽  
Endocardial Mapping ◽  
The Right

Background: Radiofrequency ablation (RFA) in Brugada syndrome (BrS) has been performed both endocardially and epicardially. The substrate in BrS is thus unclear. Objectives: To investigate the functional endocardial substrate and its correlation with clinical, electrophysiological and ECG findings in order to guide an endocardial ablation. Methods: Thirteen patients (38.7±12.3 years old) with spontaneous type 1 ECG BrS pattern, inducible VF with programmed ventricular stimulation (PVS) and syncope without prodromes were enrolled. Before to endocardial mapping the patients underwent flecainide testing with the purpose of measuring the greatest ST-segment elevation for to be correlated with the size and location of substrate in the electro-anatomic map. Patients underwent endocardial bipolar and electro-anatomic mapping with the purpose of identify areas of abnormal electrograms (EGMs) as target for RFA and determine the location and size of the substrate. Results: When the greatest ST-segment elevation was in the 3rd intercostal space (ICS), the substrate was located upper in the longitudinal plane of the right ventricular outflow tract (RVOT) and a greatest ST-segment elevation in 4th ICS correspond with a location of substrate in lower region of longitudinal plane of RVOT. A QRS complex widening on its initial and final part, with prolonged transmural and regional depolarization time of RVOT corresponded to the substrate locateded in the anterior-lateral region of RVOT. A QRS complex widening rightwards and only prolonged transmural depolarization time corresponded with a substrate located in the anterior, anterior-septal or septal region of RVOT. RFA of endocardial substrate suppressed the inducibility and ECG BrS pattern during 34.7±15.5 months. After RFA, flecainide testing confirmed elimination of the ECG BrS pattern. Endocardial biopsy showed a correlation between functional and ultrastructural alterations in two patients.

scholarly journals Association between the Anatomy of the Mandibular Canal and Facial Types: A Cone-Beam Computed Tomography Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Rudyard dos Santos Oliveira ◽  
Arlete Maria Gomes Oliveira ◽  
José Luiz Cintra Junqueira ◽  
Francine Kühl Panzarella
Keyword(s):  
Anatomical Variations ◽  
Mandibular Canal ◽  
Root Tips ◽  
Morphological Variations ◽  
The Face ◽  
Facial Types ◽  
Type 3 ◽  
Facial Type

We evaluated the anatomical variations of the mandibular canal associated with various facial types, age, sex, and side of the face studied. We analyzed 348 hemimandibles in subjects without a history of trauma, lesions in the lower arch, or orthognathic or repair surgery in the posterior mandible. Facial type was determined using the VERT index. The canal path was classified as Type 1 (a large, single structure passing very close to the root tips); Type 2 (a canal passing closest to the mandibular base); and Type 3 (a canal present in the posterior mandibular region, with a lower canal running through the mandibular branch, reaching the anterior region). Bifid canals (type 3) were classified into four categories according to the course and number of mandibular canals. The brachyfacial and mesofacial types presented a Type 1 canal in 95.5% (n=166) of subjects, in dolichofacial types, 68.2% (n=45) presented a Type 2 canal, while in the mesofacial type, a lower prevalence of the bifid mandibular canal was observed (13.0%, n=23) than in the other facial types. The bifid canal showed significant association with facial type only (p<0.05), but no significant association was observed with the anterior loop type (p>0.05). Facial type is significantly associated with the path and morphological variations of the mandibular canal, independently of the side of the face studied, age, and sex.

scholarly journals Novel CineECG Derived From Standard 12-Lead ECG Enables Right Ventricle Outflow Tract Localization of Electrical Substrate in Patients With Brugada Syndrome

2020 ◽  
Vol 13 (9) ◽  
Author(s):  
Peter M. van Dam ◽  
Emanuela T. Locati ◽  
Giuseppe Ciconte ◽  
Valeria Borrelli ◽  
Francesca Heilbron ◽  
...  
Keyword(s):  
Right Ventricle ◽  
Brugada Syndrome ◽  
Predictive Value ◽  
Normal Subjects ◽  
Outflow Tract ◽  
Arrhythmogenic Substrate ◽  
The Right ◽  
Type 3 ◽  
Electrocardiogram Ecg

Background: In Brugada syndrome (BrS), diagnosed in presence of a spontaneous or ajmaline-induced type-1 pattern, ventricular arrhythmias originate from the right ventricle outflow tract (RVOT). We developed a novel CineECG method, obtained by inverse electrocardiogram (ECG) from standard 12-lead ECG, to localize the electrical activity pathway in patients with BrS. Methods: The CineECG enabled the temporospatial localization of the ECG waveforms, deriving the mean temporospatial isochrone from standard 12-lead ECG. The study sample included (1) 15 patients with spontaneous type-1 Brugada pattern, and (2) 18 patients with ajmaline-induced BrS (at baseline and after ajmaline), in whom epicardial potential duration maps were available; (3) 17 type-3 BrS pattern patients not showing type-1 BrS pattern after ajmaline (ajmaline-negative); (4) 47 normal subjects; (5) 18 patients with right bundle branch block (RBBB). According to CineECG algorithm, each ECG was classified as Normal, Brugada, RBBB, or Undetermined. Results: In patients with spontaneous or ajmaline-induced BrS, CineECG localized the terminal mean temporospatial isochrone forces in the RVOT, congruent with the arrhythmogenic substrate location detected by epicardial potential duration maps. The RVOT location was never observed in normal, RBBB, or ajmaline-negative patients. In most patients with ajmaline-induced BrS (78%), the RVOT location was already evident at baseline. The CineECG classified all normal subjects and ajmaline-negative patients at baseline as Normal or Undetermined, all patients with RBBB as RBBB, whereas all patients with spontaneous and ajmaline-induced BrS as Brugada. Compared with standard 12-lead ECG, CineECG at baseline had a 100% positive predictive value and 81% negative predictive value in predicting ajmaline test results. Conclusions: In patients with spontaneous and ajmaline-induced BrS, the CineECG localized the late QRS activity in the RVOT, a phenomenon never observed in normal, RBBB, or ajmaline-negative patients. The possibility to identify the RVOT as the location of the arrhythmogenic substrate by the noninvasive CineECG, based on the standard 12-lead ECG, opens new prospective for diagnosing patients with BrS.

scholarly journals OPTIMALISASI LETAK NOZZLE VENTURI MIXER PADA GENSET BERBAHAN BAKAR BIOGAS

2013 ◽  
Vol 1 ◽  
pp. 45
Author(s):  
Muhrom Khudhori
Keyword(s):  
Cross Section ◽  
Performance Test ◽  
The Other ◽  
Airflow Velocity ◽  
Machine Type ◽  
The Right ◽  
Type 3 ◽  
Venturi Nozzle ◽  
Optimal Type

Carburetor modification to the venturi mixer to put a hole in the center of the venturi (end of hole venturi type nozzle on the outlet end venturi section) can turn the engine generator using biogas fuel. Airflow velocity carburetor venturi section will begin upon entering the venturi section and will be maximal at the time in the middle of the venturi section. So of course the location of the placement of venturi carburetor venturi mixer on the right cross section will be obtained velocity airflow + optimum biogas. It is necessary for optimizing the placement location of the modification of the carburetor venturi mixer, air flow + in order to obtain optimum biogas which will have implications for the performance of the generator engine. In this research, manufacture three prototypes nozzle venturi mixer that will be placed at different places in the venturi duct, then the performance test was done to determine the type and location of the venturi nozzle prototype mixer is optimal. From the results of this study that : 1) Prototype nozzle venturi mixer with the tip of the nozzle in the middle (shape elbow) has the most complicated construction than the second type (type 1 and 2) the other. Manufacturing and assembly to form the elbow (type 3) is also more complicated and more difficult , this is because the space available / remaining biogas is limited to hole channel, and 2) Using a prototype generator machine type 3 is more stable when compared with other types, despite the decline, but not very significant in comparison with the other 2 types, so the prototype mixer venturi nozzle is the most optimal type 3 (square shape).

Analisis Kapasitas Galangan Kapal Ikan Untuk Memenuhi Rencana Pengadaan Kapal Ikan Hibah

2019 ◽  
Vol 13 (1) ◽  
pp. 25-36
Author(s):  
Agus Lubis Fitriansyah ◽  
Heri Supomo
Keyword(s):  
Fishing Vessel ◽  
Fishing Vessels ◽  
Score Method ◽  
The Government ◽  
The Right ◽  
Type 3 ◽  
Selection Of

The government through the Ministry of Marine and Fisheries offers assistance of fishing vessel to achieve fisheries production targets. This procurement plan must be supported by the ability and selection of the right shipyard. Beacuse the information of the capability and capacity of fiber shipyards in Indonesia is unclear, so the realization of the procurement of fishing vessel in previous years did not met the planned targets. The purpose of this study was to analyze shipyard capacity to meet the planned procurement of KKP fishing vessels grant in 2019. First classification of fishing vessels is based on the size of each GT, which is 5 GT (type 1), 5-10 GT (type 2), and 20-30 GT (type 3). The second is the minimum shipyard criteria for building fishing boats. Third, an assessment of the shipyard is based on the criteria that have been made. Fourth, shipyard selection was carried out on each WPPN-RI using the load score method. The fifth calculates the number of ships that can be built by the shipyard. The results of the shipyard assessment found that 43% of shipyards have the ability to build type 1 vessels, around 38% of shipyards have the ability to build type 2 vessels, and around 19% of shipyards have the ability to build type 3 vessels. is 1625 units / period. Referring to shipyard capacity, it can be said that the entire shipyard is able to fulfill the plan to procure assistance for KKP fishing vessels in the 2019 budget year.

STUDY OF MORPHOLOGY OF THE ETHMOIDAL ROOF ON CT SCAN IN PATIENT WITH NASOSINUSAL SYNDROMES

2018 ◽  
Vol 8 (6) ◽  
pp. 123-129
Author(s):  
Dieu Tran Thi ◽  
Thanh Dang
Keyword(s):  
Ct Scan ◽  
Skull Base ◽  
Contralateral Side ◽  
Sinus Surgery ◽  
Adjacent Structures ◽  
Base Study ◽  
The Difference ◽  
The Right ◽  
Type 3

Background: The ethmoidal roof is the thinnest bone of the skull base. Study of morphology of the ethmoidal roof on sinus CT Scan to avoid damaging the ethmoidal roof during sinus surgery. Objective: Describe the shape of the ethmoidal roof and some adjacent structures on computed tomography. Survey the relation between the shape of the ethmoidal roof and some adjacent structures. Patients and methods: Including 177 patients with nasosinusal syndromes who examined and underwent sinus CT scan at Hue University of Medicine and Pharmacy. Result: The mean hight of the lateral lamella of the cribrifom plate is 4.27 ± 1.96 mm on the right and 4.64 ± 1.92mm on the left. Keros type 1 accounted for 41.5%, type 2 accounted for 47.2% and type 3 accounted for 11.3%. Keros classification on the left was significantly higher than that on the right side. The hight of the nasal cavity was lowest in the Keros type 1 group and highest in type 3 (p=0.001). For more than 2 mm asymmetry of the hight of the lateral lamella of the cribrifom plate, the Keros 3 group showed a statistical more common when compared to the other groups (X2=15.62, p=0.004). The hight of the lateral lamella of the cribrifom plate at the ipsilateral side (deviated side) was higher than that of the contralateral side, but the difference is not statistically significant. Conclusion: Understanding potential asymmetries and variations of the skull base contour may assist the surgeons in avoiding complications in sinus surgery. Key words: The ethmoid roof, sinus surgery

scholarly journals Evaluation of the Lingual Canals of Mandible in Cone Beam Computed Tomography

2019 ◽  
Vol 70 (11) ◽  
pp. 4105-4111
Keyword(s):  
Computed Tomography ◽  
Inferior Alveolar Nerve ◽  
Mandibular Canal ◽  
Sensory Innervation ◽  
Cone Beam ◽  
Cortical Plate ◽  
Incisive Canal ◽  
Mandibular Body ◽  
Mylohyoid Nerve ◽  
Lingual Canal

This study aims to assess the frequency of the lingual foramina and canals relative to their location on the mandibular cortical plate and also to closely inspect the course of the lingual canals inside the mandibular body using 3D reconstruction of the evaluated area. A retrospective study was conducted with 55 cone bean computed tomography (CBCT) scans in order to analyze the location, number, course and anastomosing pattern of the lingual canals. A total number of 165 lingual canals (LCs) were recorded from 55 patients, as follows: 94 median (MLC), 16 paramedian (PLC) and 55 lateral lingual canals (LLC). MLCs were a constant finding in all 55 patients (100% of the cases), PLCs were present in 15 patients (27.3% of the cases), and LLCs were identified in 35 patients (63.3% of the cases). The anastomosing pattern of the MLC, in which a supraspinous canal anastomosed with an infraspinous canal, was found in 10.9% of the cases (6 of 55 patients),. The LLCs were anastomosed with the mandibular incisive canal (MIC) in 56.3% of the cases (31 of 55 LLCs) and with the mandibular canal (MC) in 3.6% of the cases (2 of 55 LLCs). CBCT revealed itself to be a reliable tool for evaluating the intramandibular topography of the LCs. The anastomosing pattern of the lingual canals might raise the question whether the LCs could be responsible for incomplete anesthesia after conventional mandibular block by carrying sensory innervation from the mylohyoid nerve to the inferior alveolar nerve. Keywords: mandible, lingual canal, intramandibular anastomosis, CBCT

Curvature Biases in Stereoscopic Vision

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 287-287
Author(s):  
J Ninio
Keyword(s):  
Stereoscopic Vision ◽  
The Other ◽  
Vertical Segment ◽  
Directional Bias ◽  
Nasal Side ◽  
Linear Elements ◽  
The Right ◽  
Type 3

The reliability of in-depth curvature judgements for linear elements was studied with stereograms that contained two linear targets and a background representing a hemisphere. The targets were arcs facing to the left or to the right, like parentheses. Some formed binocular pairs with (type 1) or without (type 2) in-depth curvature. The others were monocular (type 3). The hemisphere in the background was generated by a random curve (Ninio, 1981 Perception10 403 – 410); it was either concave (hollow) or convex. The arcs had their binocular centre in the plane of the centre of the hemisphere. Each stereogram contained a type 1, and either a type 2 or a type 3 target. Subjects had to judge the hemisphere curvature, then the in-depth curvature of the targets in 32 different stereograms covering all curvature combinations. There were about 15% errors on type 1 targets, and 80% of these occurred when both the hemisphere and the target were convex, the target being perceived as concave, by transparency through the hemisphere. There were also about 15% errors on type 2 targets, but spread among all situations, the trend being to perceive them as slightly concave. The monocular stimuli (type 3) were judged to be frontoparallel in 70% of the cases. Otherwise, there was no directional bias except for monocular arcs on the nasal side, in conjunction with a concave background. Then, the perceived in-depth curvature was in the ‘generic’ direction predicted by associating the monocular arc in one image with a straight vertical segment in the other image.

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