Part Of Arch Research Articles

Endoscopic Retrieval of a Transpalatal Arch as an Orthodontic Emergency: A Case Report

Ingestion of a foreign object forms a potential complication, be it any branch of dentistry. The present article describes an incident of accidental foreign body ingestion by an orthodontic patient while trying to consume a firm Indian delicacy leading to fracture, and eventual swallowing of a Transpalatal arch. The case was immediately referred to Department of Gastroenterology, wherein the major part of fractured arch was retrieved endoscopically from stomach while the minor part’s trajectory was followed on subsequent radiographs until it was eliminated. This report concludes in the management and further discussion of possible clinical complications, causes, and practices for prevention.

The first specimen of a Blind snake from the Middle Miocene of Western Serbia

This article describes the first find of blind snake remains from the Middle Miocene sediments in the Vracevic locality (Western Serbia). The numerous snake remains were isolated from the fossil material of the Vracevic site. Among the many fragmented vertebrae, only one has been identified as belonging to a ?scolecophidian?. This vertebra is characterized by the neural arches depressed dorsoventrally; the vestigial neural spine limited to the most posterior part of a neural arch; posterodorsal lamina of neural arch slightly concave; paradiapophyses developed above the ventral margin of cotylar rim; indistinct haemal keel visible only on the anterior part of vertebra centrum.

Surgical and Orthodontic Management of Multiple Supernumerary Teeth Associated with Impacted Permanent Teeth: A Case Report

Background: Clinical problems are frequently detected when there are various irregularities in the number, structure, quantity, size, and eruption of the teeth. Supernumerary teeth can be found in almost any part of the dental arch, and because they are typically asymptomatic, they are frequently found by radiographic screening. Case report: The existence of the supernumerary teeth is the most frequent reason for impacted permanent teeth. This article describes the surgical and orthodontic treatment of a 20-year-old female with many supernumerary teeth and an impacted permanent tooth. All supernumerary teeth in the maxillary arch were extracted as part of the patient's treatment, and then the maxillary teeth were aligned using fixed appliances. The mandibular arch is left untreated, as the surgical removal of mandibular supernumerary teeth could damage the inferior alveolar nerve and result in numbness in the lower lip. Conclusion: In this case, we removed the extra teeth and used orthodontic traction to bring the remaining teeth into the proper position. After the procedure, the cosmetic outcome was greatly improved, and the patient's confidence increased.

КЛИНИЧЕСКИЙ СЛУЧАЙ КОАРКТАЦИИ АОРТЫ У РЕБЕНКА, ОСЛОЖНИВШЕЙСЯ ИШЕМИЧЕСКИМ ИНСУЛЬТОМ

Introduction. Aortic coarctation is a congenital defect of the cardiovascular system characterized by narrowing in the isthmus of the aorta, in which blood flow through the narrowed area is obstructed, blood pressure in the aorta increases significantly above the narrowing site, arterial hypertension syndrome develops, which can lead to a stroke. Aim. To analyze a clinical case of aortic coarctation, first detected in a 4.5-year-old child, and late- diagnosed arterial hypertension led to an ischemic stroke. Material and methods. The boy D., at the age of 4.5 years, was admitted to the hospital at the place of residence with symptoms of a stroke on the background of complete well-being. Echocardiography, electrocardiography, magnetic resonance and computed tomography of the brain, computed tomography of the chest organs with contrast, aortography, and manometry were performed. Results and discussion. The crisis course of arterial hypertension resistant to therapy was objectively noted. Echocardiography revealed coarctation of the aorta in a typical place, the defect was confirmed on computed tomography of the chest organs with contrast, on magnetic resonance imaging of the brain – extensive ischemic stroke of the right hemisphere. The early post-stroke period, post-ischemic changes in the brain made it difficult to choose cardiac surgery tactics, but given the lack of response to hypotensive therapy, it was decided to operate, resection of the narrowed aortic area with the formation of an end-to-end anastomosis was performed. Observation in the postoperative period (after 2 years) revealed hypoplasia of the distal part of the aortic arch, repeated surgery was not performed, since angiography with manometry showed a sufficient pressure gradient between the ascending and descending aorta. Currently, the child is on constant hypotensive therapy, is disabled due to neurological pathology. Conclusion. The lack of alertness of doctors regarding aortic coarctation and blood pressure monitoring did not allow early suspicion of this pathology and led to the appearance of ischemic stroke in the child, irreversible changes in the nervous system, made it difficult to choose cardiac surgery tactics.

Arteria Lusoria as a Cause of Dysphagia in an Infant

The aberrant right subclavian artery (i.e., arteria lusoria) arising from the left part of the aortic arch is a rare congenital anomaly. In some patients, esophageal compression may cause symptoms of dysphagia, also called dysphagia lusoria. It can cause serious feeding disorders and poor weight gain in young children. We present the case of an early onset of dysphagia lusoria in a 1-month-old girl whose clinical diagnosis was confirmed by esophagography and magnetic resonance imaging. This kind of vascular anomaly can present a diagnostic challenge and should be considered in diagnosing dysphagia in childhood.

CURRENT STATUS AND WAYS TO IMPROVE THE EFFICIENCY OF THE DEVELOPMENT OF "KALMAZ" UNDERGROUND GAS STORAGE FACILITIES (UGSF)

Geological structure of the "Kalmaz" oil and gas field, that is being studied since 1930, is located 100 km south-west of Baku, in the north-eastern part of the lower Kura depression. Information on geological structure, stratigraphy, tectonics, oil and gas content of the field etc. has been collected as a result of the search and exploration works carried out and structural and research wells drilled. The "Kalmaz" field was formed from the brachianticlinal fold with south-east direction from north-west. The structure is divided into separate blocks by tectonic faults, and the blocks are not interconnected. Data on stratigraphic affiliation, lithology and thickness of stratigraphic units of sediments participating in the geological section of the site were obtained on the basis of deep wells drilled here. Upper Miocene-Pont, Pliocene and Quaternary sediments are involved in the geological section of the site. Tectonically, Kalmaz brachianticlinal is located in the north-eastern part of the lower Kura depression, over the Kalameddin-Bandovan anticline zone, between Mishovdag in the West and Khidirli folding in the East. The Kalmaz structure is mainly stretched in the north-west – south-east direction, however in the western part the axis of elongation of the structure takes a close direction to the latitude circle. The structure is asymmetrical. North-east wing is upright (lying angle is 35-400) and short, the south-west wing is relatively low-leaved (22-300) and being extensive passes to the south-east Shirvan syncline. The geological aspects of the structure was complicated by a fault that cuts its elongation at a certain angle. In the western part, tectonic fault passes through the north-east wing of the structure and through the south-west wing in the eastern part. As a result of the change in the direction of the axis of the fault structure, which is being talked about, cuts off the north-eastern wing in the western part, almost perpendicular to its lengthway and passes to the neighboring Navahi syncline. As a result of the fracture, the north-eastern wing of the Kalmaz structure and the south-western pericline were broken and dropped due to other parts of the fold. It's worth to note, that the Kalmaz structure has a very complex structure. This is also denoted by the Kalmaz mud volcano located in the central part of the fold. Despite the study of the geological aspects of the site by various methods and the numerous wells drilled here, its deep tectonics and connection with neighboring Mishovdagh and Khidirli structures have not been sufficiently studied. Numerous natural oil and gas manifestations are found in the site due to mud volcano springs. The mud volcano, located in the arch part of the fold, is related to a disruption that cuts its north-east wing. There is an active oil and gas flow from the mud springs arranged on a line in the direction of this disruption. Gas discharge related to Absheron sediments was detected in the structural mapping wells No. 39, 40, 41, 42, 44, 46 drilled on this strip. In most of these wells, the gas discharge passed into the gas fountain and lasted for a long time. 40000 m3/day gas and oil was obtained from the bottom Absheron sediments in the search well No. 87/2 located in the research site. In the well No. 15, drilled in a tectonic block in the south-eastern part of the fold, oil with a daily output of 38-39 t was obtained from the IV horizon of the productive layer (PL). Gas with daily production of 22 200 thousand m3 was obtained from the upper horizon of the PL in the search and operation well No. 22, and of 180 thousand m3 was obtained from the IV horizon of the PL in the well No. 40. As a result of research and exploration drilling, the I, II, III, IV, V, VI horizons of Kalmaz site have been proven to contain oil and gas. These facts show that the Kalmaz site has great oil and gas prospects. It should be noted that the presence of rich oil and gas underground gas storage facilitiess in the not yet opened and insufficiently studied lower horizons of the productive layer is beyond doubt. For this reason, information on geological study, stratigraphy, oil and gas characteristics, development, well fund of Kalmaz field, the first underground gas storage facilities in Azerbaijan, was analyzed in the article and due to the fact that a number of problems arose during the joint exploitation of wells, it was proposed to develop the well by dividing it into horizons. Keywords: gas, underground gas storage facilities, horizon, well, gas injection.

PROSTHODONTIC MANAGEMENT OF RARE ODONTOGENIC TUMOR (PINDBORG TUMOR) WITH IMPLANT RETAINED MANDIBULAR OVERDENTURE

Pindborg tumour or calcifying epithelial odontogenic tumour (CEOT) is a rare, slow-growing benign tumour occurring most frequently in the posterior part of the mandibular arch. Management ranges from simple enucleation to a segmental resection of the mandible. The latter compromises the jaw foundation for any future prosthetic rehabilitation and warrants jaw reconstruction procedures to improve the retention and stability of the prosthesis. Using mini-implants in such compromised situations is a minimally invasive and cost-effective aid compared to conventional implants. The present case report documents the prosthetic rehabilitation of a patient who underwent mandibular resection for a Pindborg tumour using mini-implants.

Infraocclusion – an anomaly in primary dentition

Infraocclusion is a developmental abnormality that affects a tooth lying below the plane of occlusion. It is most common in children with mixed dentition, past the age of six. It is usually noticeable in the posterior part of the dental arch, involving one of the deciduous molars. The presence of infraocclusion can be identified by clinical examination or on radiographs. The aim of the study was to present a literature review on the incidence of infraocclusion in primary molars in children in various populations and on further clinical management. The review covered publications from the last 20 years. The following online databases were searched: PubMed, Google Scholar, and Scopus. Eight scientific papers were eligible for the review. The inclusion criteria were as follows: children, without systemic diseases or syndromes, with infraocclusion. The analysed studies show that the process usually affects a small number of teeth – most children present two infraoccluded molars. The condition shows no predilection for any sex. Across different populations, the percentage of children affected by infraocclusion ranges from 2.8% to 21.8%. With age, there is a decrease in the incidence of mild infraocclusion, and an increase in the incidence of the moderate (ages 8–10) and severe (ages 11–13) forms of the condition. Our review reveals that infraocclusion most often affects the teeth in the mandible, mainly the first primary molars and, in older children, the second molars. The treatment of patients should be planned individually, considering the age of the subjects and their clinical status. Tooth extraction is performed in extremely severe cases, which are uncommon.

Biometric parameters of the upper dental arch in patients with a stable result of orthodontic treatment of abnormal position of the crowns of the maxillary canines

Aim to evaluate the metric parameters of the upper dentition in patients with a stable result of orthodontic treatment of anomalies in the position of the crowns of the upper canines in the long-term follow-up period.
 Material and methods. We conducted an open study on a sample of patients after orthodontic treatment using clinical and instrumental methods. We analyzed 126 clinical cases of patients aged from 18 to 44 years with completed orthodontic treatment of abnormal position of the crowns of the maxillary canines with satisfactory aesthetic and functional results. The duration of the retention period ranged from 5 to 10 years. 75 patients met the inclusion criteria for the study.
 Results. The study showed that the biometric parameters of the dental arches after the end of orthodontic treatment did not always correspond to the individual norm of a patient. An increase in the transversal size of the upper dentition in the region of the premolars was determined in 44 patients (58.6%), a slight narrowing in the region of the first molars in 34 patients (45.4%), lengthening or shortening of the anterior part of the dental arch in 32 (42.7%) and 23 (30.6%) patients, respectively. With the proportionality of the mesio-distal dimensions of the incisors of the upper and lower jaws (Tonn's Index 1.340.03) and the relative macrodontia of the canines of the lower jaw (anterior Bolton's ratio 81.03.2%), the symmetrical position of the crowns of canines of the upper jaw and the value of the rotational angle of 28.02.1corresponded to the functionally optimal results of orthodontic treatment.
 Conclusion. Aesthetically satisfactory and functionally stable results of orthodontic treatment of patients with anomalies in the position of the crowns of the maxillary canines during the retention period correspond to the following biometric parameters of the upper dental arch and / or their combination: lengthening of the anterior region, an increase in the transversal size in the region of the first premolars and a decrease in the region of the first molars in maintaining the individual norm of intercanine width. The stability of the results of orthodontic treatment in patients with anomalies in the position of the canines and the shape and / or size of the dental arches is ensured by the maximum possible leveling of violations of the anatomical and topographic norms of the teeth position.

Aberrant Right Subclavian Artery: Cadaver Case Report

While examining the anatomy of a cadaver in a medical school gross anatomy course, an aortic arch anomaly was discovered. This variant is consistent with an aberrant right subclavian artery (ARSA). In this variant the right subclavian artery branches from the most distal part of the aortic arch and runs both retrotracheal and retroesophageal as it courses to the right shoulder. This variant is a result of aberrant development of the aortic arch and may include presenting symptoms such as dysphagia and shortness of breath, if any at all. Additional to the ARSA exists a common bicarotid trunk and a direct branching of the left vertebral artery from the aortic arch, both of which are rare anomalies. The cadaver’s medical history includes dysphagia and stretched esophagus, although the severity is unknown. This case report draws attention to these rare anatomical anomalies and includes a discussion of the most common clinical presentation, and surgical implications of an aberrant right subclavian artery anomaly.

High-carbon carbonate-siliceous domanik-type deposits: object of hydrocarbon resource base development in central part of South Tatarsky Arch

High-carbon carbonate-siliceous domanik-type deposits: object of hydrocarbon resource base development in central part of South Tatarsky Arch

Definition of the geological structure of deposits of Tyumen suite based on the results of tectonic-sedimentary analysis of the eastern part of the Krasnoleninsky arch of Western Siberia

We present in this article results of an analysis of materials of a complex of geological and geophysical studies, including a description of the core data, facies' characteristics, tectonic features of the evolution of the territory, field development geophysical data. The initial materials for the research were the drilling data and the results of seismic surveys, as well as publications of geologists and geophysicists dealing with the problem of finding ways to increase the efficiency of the development of hard-to-recover reserves of Tyumen suite. The research area is confined to the eastern slope of the Krasnoleninsky arch of Western Siberia, within which several oil fields of various sizes have been identified that are now being actively development.Based on the work carried out on the group of layers of Tyumen suite, areas of distribution of lithofacies of fine-medium-grained and multi-grained sandstones within the forecast area of development of channels and cones of deltas and facies of channel valleys were identified, taking into account the structural factor and isopach maps. The transverse dimensions of the boundaries of the development of riverbed valleys with a very complex configuration range from 0.5 to 2.5 km. The predicted effective sandstone thicknesses of individual strata in areas with improved filtration and capacitive properties reach 12-14 m.The analysis of the geological structure of the deposits of Tyumen suite will serve as an information basis for creating the molds of reliable geological model, based on which, with the help of digital modeling, an assessment of the prospects for further work on the object under study and the search for the necessary methods for its development will be

Analysis of the degree of influence of geological and technological factors on the initial flow rates of wells commissioned after their downtime

The results of statistical processing of data from 97 wells put into re-operation, after their long downtime due to flooding, are presented. In which, depending on the geological and physical conditions and the state of development of oil deposits, different results are obtained. With an average initial oil flow rate of 1.12 tons/day in reservoir-vaulted deposits with low-viscosity oil in the Fergana oil and gas region - 0.5 tons/day, in reservoir-arch deposits with high-viscosity oil in the Surkhandarya oil and gas region - 0.97 tons/day, in sub-gas deposits of the Bukhara-Khiva region - 2.5 tons/day. By assessing the informativeness of geological, physical and technological factors using the Kulbak method, the degree of their influence on the initial oil flow rate of wells after their re-commissioning was established. Taking into account the degree of influence of the factors considered, it is recommended to put into re-operation wells located in the arched part of the reservoir, having the highest effective oil-saturated thicknesses, in areas with a low oil recovery factor and a lower degree of reduction in initial reservoir pressure, as well as watered in a short period of operation.

En bloc resection of huge primary tumors with epidural involvement in the mobile spine using the "rotation-reversion" technique: Feasibility, safety, and clinical outcome of 11 cases.

En bloc resection of spinal tumors provides better local control and survival outcomes than intralesional resection. Safe margins during en bloc resection of primary spinal tumors with epidural involvement are required for improved outcomes. The present study describes a "rotation-reversion" technique that has been used for en bloc resection of huge primary tumors in the mobile spine with epidural involvement and reported the clinical outcomes in these patients. All patients with primary spinal tumors who were treated with the rotation-reversion technique at our institution between 2015 and 2021 were evaluated retrospectively. Of the patients identified, those with both huge extraosseous soft-tissue masses and epidural involvement were selected for a case review. Clinical and radiological characteristics, pathologic findings, operative procedures, complications, and oncological and functional outcomes of these patients were reviewed. Of the 86 patients identified with primary spinal tumors who underwent en bloc resection using the rotation-reversion technique between 2015 and 2021, 11 had huge extraosseous soft-tissue masses with epidural involvement in the mobile spine. The average maximum size of these 11 tumors was 8.1 × 7.5 × 9.7 cm. Median follow-up time was 28.1 months, mean operation time was 849.1 min (range 465-1,340 min), and mean blood loss was 6,972.7 ml (range 2,500-17,700 ml), with 10 (91%) of the 11 patients experiencing perioperative complications. The negative margin rate was 91%, with only one patient (9%) experiencing local recurrence. Ten patients were able to walk normally or with a crutch at the last follow-up, whereas one was completely paralyzed preoperatively. The rotation-reversion technique is an effective procedure for the en bloc resection of huge primary spinal tumors, with the extension of invasion in selected patients including not only the vertebral body but also the pedicle and part of the posterior arch.

Evaluations and Measurements of the Occurrence of Maxilla and Palatine Bone Asymmetry Based on 3D Printed Stereolithographic Models in Elderly Edentulous People

This study aimed to evaluate and measure the occurrence of jaw and palate asymmetry based on 3D-printed stereolithographic models of edentulous elderly people. The analyses were performed on 3D models of the jaws, which were printed using the data (CT) obtained from the CBCT center. The control group consisted of 10 modern adult skulls (7 male and 3 female skulls) owned by the Department of Anthropology of the Wrocław University of Environmental and Life Sciences. The small size of the studied groups did not allow for the performance of the analysis indicating the form of the observed morphological asymmetry—it was impossible to differentiate to indicate whether the examined features showed directional or fluctuating asymmetry. However, it was possible to determine the direction of the morphological asymmetry of the analyzed features. Both in the test group and the control group, it was a right-sided asymmetry. The analysis of the significance of differences in mean values of the asymmetry index showed that the intensity of asymmetry of the anterior part of the superior alveolar arch was significantly greater in the test group. The severity of the asymmetry of the lateral part of the alveolar arch in the tested groups did not differ significantly. The authors concluded that adequate maxillary height does not only influence proper dental prosthesis adhesion but also corresponds with a potential source for correct dental implant placement. We also concluded that the vertical height of the edentulous alveolar process of the mandible is important for adequate prosthesis fixing. In some cases, the bone atrophy and the bone itself are asymmetrical, so planning a prosthesis might be challenging. The adequate placement of implants should include the symmetry of jaw bones because of future masticatory force impact on the bone and the entire masticatory system, including the temporomandibular joint.

Evaluation of Dural Parameters at C1 Level in Patients with Chiari 1 Malformation Following Foramen Magnum and C1 Posterior Arch Removal: Introduction of a Novel Concept to Decompress without Affecting Stability.

Chiari 1 malformation has crowding at craniovertebral junction (CVJ), treated by Foramen magnum decompression (FMD) but is associated with high failure rates, which is explained by recently introduced concept of central instability. So, we propose a new concept of relieving this crowding without affecting stability. To derive a threshold for coring out of internal surface of C1 posterior arch instead of complete laminectomy accompanying FMD. We prospectively included nine patients with a mean age of 25.33 ± 7.97 years, diagnosed with ACM-1 without AAD, who were operated with FMD and lax duraplasty and C1 laminectomy. The preoperative dural diameter and area covered under the dura at the level of C1 were measured and compared with the postoperative state. Results were analyzed to derive a cut-off threshold which could be drilled from the inner aspect of C1 arch. The postoperative AP diameter of the dura increased statistically significantly from pre-op; however, the AP extension was less than the preoperative diameter with posterior arch included. Likewise, the area spanned by the dura increased statistically significantly from pre-op but was less than the cumulative area of dura with C1 arch included in pre-op. Analyzing all, a mean cut-off of 50.58% was achieved. The authors suggest FMD with partial coring (~50%) of the inner part of arch of C1, instead of full-thickness laminectomy with a wider length of coring as the target, and this will serve the purpose intended, without increasing mobility.

To Be a Holy People: Jewish Tradition and Ethical Values

To Be a Holy People: Jewish Tradition and Ethical Values

Design and Use of a Pair of Computer-Designed Surgical Templates in Reduction of a Comminuted Zygomatic Arch Fracture.

Isolated depressed zygomatic arch fractures are often treated with closed reduction. Reduction is usually performed through the Gillies approach or Keen approach. comminuted zygomatic arch fractures generally require open reduction and fixation to achieve good results. This article describes how to use a pair of surgical templates to assist in the fixation of comminuted zygomatic arch fractures with absorbable plates. A pair of computer-designed surgical templates were applied to restore the main part of zygomatic arch. Placing a surgical template on the medial side of the zygomatic arch can provide a supporting force and improves the stability of the reduced bone fragments. The lateral template of zygomatic arch limits the excessive uplift of bone fragments. The operation was performed according to the predetermined procedure. Postoperative computed tomography showed satisfactory reduction effect. In conclusion, with the aid of surgical templates, the reduction and fixation of comminuted zygomatic arch fractures can be more easily performed using absorbable plates.

Prediction of oil occurrence using structural parameters of ЮС1 reservoir in the northern part of Surgut Arch: development of probabilistic-statistical models

Prediction of oil occurrence using structural parameters of ЮС1 reservoir in the northern part of Surgut Arch: development of probabilistic-statistical models

Practical aspects of induced structurization of rock mass

Ground control is connected with monitoring of deformations of enclosing rock mass in the course of mining for ensuring stability of underground openings. One of the negative consequences of redistribution of rock pressure in an extraction panel during mining operations is swelling of floor rocks. The present article considers mining conditions of coal seams using the features of formation and development of nonlinear structurization of rock mass during longwall advance, earlier revealed at the Institute of Coal. The calculation basis is the developed parametrical model of geomechanical processes in rock mass during mining using the longwall top coal caving method. The rock mass is considered at the first approximation as a uniform isotropic medium without regard to mechanical properties of rocks. The model rock mass is presented as a set of manmade geomechanical layers. Their formation begins from a coal seam being mined and develops with the longwall advance with regard to elastic energy of rock mass. In the manmade change of external conditions, the rock mass rebates its energy potential via arching and movement. The bodies of “arches of movement” tend to paraboloids in shape. Formation of such shapes corresponds to the concept of minimum energy spend for the creation of a new surface under uniaxial unloading. The height of the arches-paraboloids is equal to the thickness of geomechanical layers at different scales of the structural hierarchy of rock mass. The horizontal dimension of the archesparaboloids is divisible by a longwall length. It is possible to detect sites of increased rock pressure applied to the boundaries and roof support of underground openings by means of geometrical overlapping of circles having diameters equal to the basal parts of displacement arches with load-bearing edges. Integration of the displacement arches of the adjacent extraction panels leads to connection of their mined-out areas and to gas cross-flow between them. The cardinally new approach to understanding geomechanical processes in rock mass can allow predicting adverse phenomena of rock pressure and the increased methane emission during high-rate longwalling.