[Cervicogenic dysphagia: a case report]. / Tservikogennaya disfagiya: sluchai iz praktiki.

The article presents a case of pharyngeal dysphagia and obstructive sleep apnea syndrome caused by degenerative-dystrophic changes in the cervical spine with the formation of large cervical osteophytes at the C3-C6 level. Osteophytes caused deformation of the posterior wall of the hypopharynx and narrowing of its lumen by 20-25% from the level of the arytenoid cartilages to the upper parts of the epiglottis. CT scan also showed the intervertebral disc heights lost, as well as osteophytes at the posterolateral margins of the vertebral bodies (disc osteophyte complex). Osteosclerosis in combination with facet arthrosis caused spinal and foraminal stenosis.

[Maxillary sinusitis as a complication of dental implants placement: a case report]. / Verkhnechelyustnoi sinusit kak oslozhnenie dental'noi implantatsii: sluchai iz praktiki.

The article presents a case of chronic odontogenic maxillary sinusitis and the results of its surgical treatment. The cause of the sinusitis, confirmed by the results of X-ray and pathohistological studies, was an inflammatory process affecting the bone tissue around the implant, installed in the place of the upper first molar which was accompanied by the development of an oroantral fistula. During the surgical intervention, the communication between the oral cavity and the maxillary sinus was eliminated, and the implant with the abutment, which was entirely in its cavity, was also removed.

[Diagnostic criteria of maxillary sinus hypoplasia using cone-beam computed tomography]. / Diagnosticheskie kriterii gipoplazii verkhnechelyustnoi pazukhi po dannym konusno-luchevoi komp'yuternoi tomografii.

OBJECTIVE: To evaluate the diagnostic significance of X-ray criteria of maxillary sinus hypoplasia. MATERIAL AND METHODS: Cone-beam computed tomography (CBCT) data of 553 patients (1006 maxillary sinuses) with dental and ENT pathology from Minsk outpatient clinics, were studied. The morphometric parameters of 23 maxillary sinuses with radiological signs of hypoplasia, as well as orbits on the affected side, were analyzed. The maximum linear dimensions were measured using the tools of the CBCT viewer. The convolutional neural network technology was applied for maxillary sinus semi-automatic segmentation. RESULTS: The reliable radiological signs of hypoplasia of the maxillary sinus are a two-fold decrease in its height and/or width relative to the corresponding dimensions of the orbit, a high level of location of the inferior wall of the sinus, displacement of its medial wall to the lateral side, anterolateral wall asymmetry in association with unilateral hypoplasia, as well as lateralization of the uncinate process and ethmoid infundibulum with narrowing of ostial passage. CONCLUSION: In unilateral hypoplasia, the volume of the sinus is reduced by 31-58% compared to the contralateral side.

[Relationships between the inferior wall of maxillary sinus and the roots of the maxillary molars]. / Vzaimootnosheniya kornei molyarov s nizhnei stenkoi verkhnechelyustnoi pazukhi.

OBJECTIVE: The aim of the study is to evaluate the position of the roots of the first and second upper molars relative to the bottom of the maxillary sinus (maxillary sinus) according to cone-beam computed tomography (CBCT). MATERIAL AND METODS: The CBCT scans of 150 patients (69 men and 81 women) from the database of the X-ray department of the 11th City Clinical Hospital of Minsk who applied for dental care were studied. There are 4 variants of vertical relationships between the roots of the teeth and the lower wall of the maxillary sinus. At the contact of the molar roots and the bottom of the HPV, 3 variants of the horizontal relationship between the roots of the teeth and the bottom of the maxillary sinus in the frontal plane were identified. RESULTS: The root apices of the maxillary molars can be located below the level of the MSF (type 0; 16.69%), contact with MSF (types 1-2; 72%) or protrude into the sinus cavity (type 3; 11.31%) at a distance of up to 6.49 mm. The roots of the second maxillary molar showed greater proximity to the MSF than the first molar roots and more often protruded into the maxillary sinus. The most common type of horizontal relationship between the molar roots and the MSF, in which the lowest point of the MSF was located centrally between buccal and palatal roots. It was found that the proximity between the roots and the MSF correlates with maxillary sinus vertical dimension. This parameter was significantly greater in type 3 when the roots protruded into the maxillary sinus than in type 0, when there was no contact between the MSF and the root apices of the molar teeth. CONCLUSION: Significant individual variability in the anatomical relationships between the roots of the maxillary molars and the MSF indicates the need for the mandatory appointment of cone-beam computed tomography in preoperative planning for the extraction of these teeth and/or their endodontic treatment.

[Anatomical variations of the ethmomaxillary sinus]. / Variantnaya anatomiya reshetchato-verkhnechelyustnoi pazukhi.

OBJECTIVE: To establish the prevalence and individual variations of the ethmomaxillary sinus (EMS) using cone beam computed tomography (CBCT). MATERIAL AND METHODS: CBCT images from 553 dental and ENT patients (1106 sides), presenting to treatment at Minsk outpatient clinics, Belarus, were used in this study. The maximum vertical diameter of ethmomaxillary sinus in the coronal plane was measured. Anatomical variations of the ostiomeatal complex and mucosal diseases of paranasal sinuses were recorded. RESULTS: Ethmomaxillary sinus - is posterior ethmoidal cell extending to the posterior superior part of the maxillary sinus (MS) while draining into superior meatus. It was present in 13 of 553 patients (2.4%). The age of patients with EMS ranged from 12 to 60 years, including 8 males and 5 females. A total of 5 patients had unilateral EMS and 8 patients - bilateral EMS. Ethmomaxillary sinus was extended to the alveolar bone in five cases. Moreover, in two cases, the roots of the upper third molars protruded into its lumen. CONCLUSION: The enlarged posterior ethmoidal air cell can occupy the posterior superior portion of the maxillary sinus and even reach the alveolar bone. Such a cell is called the ethmomaxillary sinus and, as a rule, its presence is accompanied by excessive pneumatization of other cranial bones. Inflammation of the mucous membrane of the ethmomaxillary sinus is most often not combined with the radiographic signs of maxillary sinusitis, and a direct communication of the EMS and MS was detected in only one patient.

[Topographic assessment of the vascular anastomosis in the maxillary sinus wall using cone-beam computed tomography]. / Topografiya sosudistogo anastomoza v stenke verkhnechelyustnoi pazukhi po dannym konusno-luchevoi komp'yuternoi tomografii.

OBJECTIVE: The aim of the study was to establish the prevalence, diameter and topography of the intraosseous vascular canal of the maxillary sinus lateral wall. MATERIAL AND METHODS: The data of cone-beam computed tomography of 150 dental patients (294 maxillary sinuses) were analyzed. RESULTS: Intraosseus anastomosis of the branches of the posterior superior alveolar artery and infraorbital artery was detected in 87.8% of cases (258 of 294 sinuses). Anastomosis was found inside the wall of the sinus in every tooth location in 9.5% of sinuses; in other cases, the anastomosis was partially or fully embedded in the thickness of the lateral wall of the maxillary sinus in different tooth site. The mean diameter of the vascular anastomosis was 0.95±0.3 mm (range 0.3-2.18 mm). The average distance from the anastomosis to the sinus floor was 8.91±3.39 mm (range 1.68-21.83mm). In most cases, at locations of molars and premolars, the distance from the vascular anastomosis to the alveolar crest was greater than 15 mm (from 75.5% at the location of the first molar to 99.2% at the location of the first premolar). CONCLUSION: Detection of the topography of the vascular anastomosis by using cone-beam computed tomography is essential when planning the position of the antrostomy for the lateral sinus lift procedure in order to minimize iatrogenic complications.

[Automated system of the determination of maxillary sinus morphometric parameters]. / Avtomatizirovannaya sistema opredeleniya morfometricheskikh parametrov verkhnechelyustnoi pazukhi.

THE AIM OF THE STUDY: Was to compare manual, semi-automatic and automatic methods for determining the maxillary sinus volume using cone beam computed tomography (CBCT). MATERIAL AND METHODS: CBCT images from 48 patients (96 maxillary sinuses) with no history of sinus and alveolar bone surgery, who were presented to Minsk medical centers, were used in this study. Neural network training was performed on CBCT scans of 42 patients (84 maxillary sinuses).The height, depth and width of the sinus were measured manually on CBCT scans of 6 patients (12 maxillary sinuses). Maxillary sinus volume (V) was calculated by the formula: V=height´depth´1/3 width. Semi-automatic segmentation was carried out by an expert radiologist. The convolutional neural network technology was applied for maxillary sinus automatic segmentation. RESULTS: The largest values were revealed by using the automatic method for sinus volume measurement. These values were within the 95% confidence interval (±4.29 cm3) of the average sinus volume obtained from semi-automatic method. CONCLUSION: The data obtained using the convolutional neural network technique (artificial intelligence) has a high correlation with the results of sinus morphometric analysis acquired through manual and semi-automatic methods. Automatic maxillary sinus segmentation technique does not require special user knowledge. This method is reproducible and it is implemented in a short time interval.

[Topography of maxillary sinus septa according to cone beam computed tomography data]. / Topografiya sept verkhnechelyustnoi pazukhi po dannym konusno-luchevoi komp'yuternoi tomografii.

The aim of the study was to establish the location, orientation and height of the maxillary sinus primary septa. The data of 100 cone-beam computed tomography scans of patients with a mean age of 37.6±15.4 years from dental outpatient hospitals of Minsk, Belarus taken from 2012 to 2019 were analyzed. The prevalence of sinus septa was 45.6% for sinuses and 37.2% for patients. As a rule, septa were symmetric bilaterally. The heights of septa varied from 2-3 mm to 8-14 mm in the majority of cases. Orientation of septa was coronal in 94.7%, sagittal in 3.9%, and horizontal in 1.4% of cases. The location of the septa must be considered when planning for dental implants. In addition, septa in the upper and posterior regions of the maxillary sinus may interfere with mucociliary clearance.

[Bifid mandibular canal]. / Razdvoennyi kanal nizhnei cheliusti.

The article describes three types of bifurcations of the mandibular canal that were identified as accidental findings in cone-beam computed tomograms of the maxillofacial area of patients subjected to dental treatment. Bifid mandibular canal types are illustraded with clinical cases.

[Histomorphology of chronic apical periodontitis].

Histologic mounts of 20 decalcified teeth were studied, the roots of the teeth after extraction preserved the connection with the periapical formation. Analysis of the received morphological data let make more exact the mechanism of forming and persisting the inflammation focus round dental root apex and give practical recommendations how to treat chronic apical periodontitis.

Light microscopic study of periapical lesions associated with asymptomatic apical periodontitis.

The purpose of the study has been to evaluate the degree of chronic inflammation in tissues surrounding the apex of the tooth root in patients with apical periodontitis in the remission phase. The material included 37 apical granulomas and radicular cysts obtained as a result of apiectomy, and 20 teeth which were removed together with the focus of the periapical inflammation. Routine histological techniques, as well as the immunofluorescent and immuno-chemical methods were used to examine the material. Despite the absence of clinical symptoms in 23 of 57 cases, the morphological signs of chronic inflammation were observed in the apical area of the tooth root. Morphological signs of viral invasion of epithelial and stromal cells in the radicular cyst wall were revealed in six cases. The presence of the virus of Herpes simplex I in epithelial cells (five cases) and adenoviral invasion (one case) was confirmed by immuno-fluorescent and immuno-chemical methods. Histological examination often reveals morphological signs of an active inflammatory process in the periapical tissues of patients treated during clinical remission. In our opinion, the presence of viruses in the epithelial cells of the radicular cyst may contribute to the persistence of the active stage of the inflammatory process.

[Qualitative and quantitative parameters of the growth of the skeleton of the extremities of embryos and early fetuses in man]. / Kachestvennye i kolichestvennye pokazateli rosta skeleta konechnostei émbrionov i rannikh plodov cheloveka.

One hundred and ten human embryos 6-9 weeks of the intrauterine development have been investigated. Sequence of anatomical differentiation of the skeleton in the composition of the upper and lower extremities has been stated. Quantitative changes of the parameters of each anlage at successive stages of the development are analyzed. Equations of regression are obtained, owing to them it is possible to determine age of human embryos and early fetuses in dependence on size of separate fragments of the extremities.

[Ossification of the cartilage skeleton of the extremities of human embryos]. / Okostenenie khrashchevogo skeleta konechnostei zarodyshei cheloveka.

Certain sequence in appearance of ossification points has been stated in the cartilage models of the superior and inferior extremities of the human embryos at the end of the embryonal and the beginning of the fetal periods of development. The change in the size (length) of the ossification points in anlages of the long tubular bones during the successive stages of embryogenesis is of linear character and can be described by means of the equation y = ax + b, where y--age of the embryo (days), x--length of the osseous points. Coefficients a and b are calculated for estimation the age of the embryos according to the length of the osseous points in the anlages of the brachial, femoral and radial bones.

[Skeletal anomalies in the VATER syndrome in human embryos]. / Anomalii skeleta pri sindrome VATER u zarodyshei cheloveka.

Anomalies of the skeleton and internal organs have been described in 9- and 12-week-old human fetuses with the VATER syndrome. Together with the known anomalies occurring at the syndrome, certain anomalies in development of the skin, tarsus and wrist bones are revealed.

[Pathogenesis of radiation-induced abnormalities of the bones and joints of white rat embryos]. / Patogenez luchevykh anomalii skeleta i sustavov zarodyshei beloi krysy.

After X-radiation of pregnant rats on the 10th day of pregnancy, in 50% of the fetuses studied subtotal aplasia of the tibial bone anlage and decreasing number of the metatarsus and finger phalanges anlages are observed. Radiation on the 11th day of embryogenesis does not result in anomaly formation of the thoracic and pelvic extremities. After radiation on the 12th day of embryogenesis, the most specific anomaly of the pelvic extremity is phocomelia. The thoracic extremity skeleton lesions are revealed as an ulnar type of distal ectromelia, or axial ectromelia. After radiation on the 13th--14th day, hypoplasia of the bone anlages, that make zeugopodium, autopodium, is observed. After radiation on the 13th day, a partial or total aplasia of the fibular bone anlage can take place. In all the fetuses a sharp decrease in number of the hand and foot bone anlages is observed; it is connected with a total aplasia of some of them and with fusion of the others. A specific feature for radiation lesions of the extremity skeleton is that the oppositely situated anlages of the bones do not separate from each other. This results from certain disturbances in the joint interzone formation at early stages of embryogenesis and from underdevelopment of the joint cleft. Qualitatively different radiation anomalies of the extremity skeleton development are formed as consequence of disturbances in morphogenetic processes of determination: migration, proliferation, morphogenetic cell death and differentiation.

[Case of bilateral preaxial polydactyly in a 7-week-old human embryo]. / Sluchai dvustoronnei preaksial'noi polidaktili u 7-nedel'nogo zarodysha cheloveka.

In the translucent preparation, totally stained with alcian blue and alizarin red, bilateral preaxial polydactyly (an additional finger makes a joint with the I metacarpal bone anlage) and the epicondyle process on the brachial bone anlage have been revealed.

[Rare case of manifestation of a proatlas]. / Redkii sluchai manifestatsii proatlanta.

A two-sided lateral manifestation of the proatlas is described on the human macerated skull with formation of the atlas-proatlas articulations.

[Pathogenesis of skeletal radiation injuries to the proximal portion of the pelvic extremity in white rat embryos]. / Patogenez luchevykh povrezhdenii skeleta proksimal'nogo otdela tazovoi konechnosti u émbrionov beloi krysy.

The mechanisms forming certain anomalies in the pelvic proximal part in the offspring of white rats subjected to x-ray radiation on the 12th and 13th days of gestation have been analysed. Serial sections of the embryos performed at various time after radiation and electron microscopic investigations have demonstrated that radiation lesions in the locomotor apparatus are of different pathogenesis. Defects in the femoral and pelvic bones, their fusion in the coxofemoral joint are anomalies resulted from destruction of some mesenchymal cells in the proximal part of the pelvic bud. Femoral dislocation, formed during gestation, is a result of disorders in coordinative muscle development, surrounding the joint and that of hypoplasia in the bursae-ligamentous apparatus (lack of head ligament, hypoplasia of the acetabular lip). Power disbalance in the muscles surrounding the joint is the main course resulting in dislocation of the femoral head.