Research objective - an assessment of morphological and element composition various as surfaces of implants, with the diagnosis periimplantitis, subjected to processing by the Er laser; Cr; YSGG wave of 2780 nanometers long in comparison with not subjected. Used implants of three producers: (1 - Nobel Biocare (Sweden), TiUnite surface; 2 - XIVE Dentsplay (Germany), SLA surface; 3 - BioHorizons (USA), RBM surface). Electronic and microscopic methods investigated surfaces of the control (new) implants removed with the diagnosis periimplantit, with the diagnosis periimplantit and processed by the laser. It is revealed that the surface of new sterile implants isn't ideal, on it there are traces of impregnation by inorganic connections, a large amount of foreign chemical elements, especially on a surface of SLA of an implant of XIVE Dentsplay is revealed. The surface of skilled implants with the diagnosis periimplantit is very strongly polluted by carbon (C), phosphorus (P), sulfur (S), silicon (Si), etc., being formed on a surface during an inflammation. After processing of the same surface by the Er laser; Cr; YSGG wave of 2780 nanometers long occurs surface clarification, and the element structure almost completely corresponds to the control.

Dental implant therapy is a well-accepted treatment modality. Despite good predictability and success in the early stages, the risk of postplacement inflammation in the long-term periods remains an urgent problem. Surgical access and decontamination with chemical and mechanical methods are more effective than antibiotic therapy. The search for the optimal and predictable way for peri-implantitis treatment remains relevant. Here, we evaluated four cleaning methods for their ability to preserve the implant’s surface for adequate mesenchymal stem cell adhesion and differentiation. Implants isolated after peri-implantitis were subjected to cleaning with diamond bur; Ti-Ni alloy brush, air-flow, or Er,Cr:YSGG laser and cocultured with mice MSC for five weeks. Dental bur and titanium brushes destroyed the implants’ surfaces and prevented MSC attachment. Air-flow and laser minimally affected the dental implant surface microroughness, which was initially designed for good cell adhesion and bone remodeling and to provide full microbial decontamination. Anodized with titanium dioxide and sandblasted with aluminum oxide, acid-etched implants appeared to be better for laser treatment. In implants sandblasted with aluminum oxide, an acid-etched surface better preserves its topology when treated with the air-flow. These cleaning methods minimally affect the implant’s surface, so it maintains the capability to absorb osteogenic cells for further division and differentiation.

BACKGROUND: In modern conditions, in the widespread clinical practice in the prosthetics of patients with complete edentulism, the anatomical and physiological method and its modifications have become popular. However, for all its reliability and ease of use, this method is not without drawbacks. AIM: Improving the effectiveness of complete removable dentures. By developing a new method for determining the central ratio of the jaws. MATERIAL AND METHODS: An innovative method for determining the central ratio of the jaws was created by improving the functional-physiological method for determining the central ratio of the jaws, using a gnatometer and teleradiographic examination. RESULTS: 100 prostheses were made by this method for 74 patients. A comparative correlation analysis of teleradiographic images with old prostheses before treatment, with a gnatometer in the oral cavity during treatment, and with new prostheses 2 months after treatment was carried out. CONCLUSION: The proposed method for determining the CSF allows highly accurate, in accordance with individual anatomical parameters and features, to determine the bite height and central occlusion of the patient as a model for the reconstruction of the future dentition, taking into account and in accordance with Angles skeletal class.

Лабораторное исследование качества обтурации корневых каналов зубов при применении различных методик медикаментозной обработки корневых каналов

Важная клиническая роль в убыли костной ткани отводится микрозазору между установленным имплантатом и абатментом. В зависимости от размера микрозазора, его локализации и стабильности при жевательной нагрузке можно судить о прогнозе выживаемости имплантата в условиях постоянной микробной контаминации. Однако на сегодняшний день, помимо оригинальной, на стоматологическом рынке представлена и неоригинальная супраструктура с соответствующими сертификатами качества. Перспектива ее использования требует углубленного изучения. Цель — сравнить величины микрозазора в коническом соединении имплантатов различных систем с оригинальным и неоригинальным абатментом под действием жевательной нагрузки. Для исследования были выбраны имплантаты и стандартные абатменты трех имплантационных систем: Straumann BL (Швейцария), BioHorizons Tapered Internal (США), Nobel Biocare CC (Швейцария), а также неоригинальные абатменты системы ADM Dental (Россия). В ходе эксперимента с помощью метода конечных элементов моделировалась жевательная нагрузка силой 150, 300 и 450 Н, измерялась величина микрозазора и горизонтального отклонения абатмента от исходной оси. Для анализа степени различий показателей оригинальных и неоригинальных абатментов использовался пакет DTW (Dynamic Time Warping) языка программирования Python. Наибольшие значения горизонтального отклонения абатмента наблюдаются у образцов системы Nobel; абатменты BioHorizons имеют наименьшее среднее отклонение при нагрузке в 150 Н; супраструктура Straumann показала наименьшее отклонение при нагрузках в 300 и 450 Н. Наибольшие значения остаточного отклонения абатмента наблюдаются у образцов системы Nobel, наименьшие — у BioHorizons. Наибольшие значения микрозазора при латеральной нагрузке выявлены в системе BioHorizons, наименьшие — в Straumann. Максимальный остаточный микрозазор после разгрузки наблюдается в системе Nobel, нулевые значения остаточных микрозазоров показала система Straumann. Только у Straumann в 100% случаев соединение имплантата с оригинальным абатментом демонстрирует меньшие значения микрозазора и горизонтального отклонения по сравнению с неоригинальным абатментом. В остальных случаях наблюдается тенденция меньших значений при использовании неоригинальной супраструктуры. Применение оригинальной или неоригинальной супраструктуры коррелирует с величиной микрозазора в коническом соединении, а полученные данные говорят о возможности применения неоригинальных абатментов в клинической практике. При этом большее влияние на полученные величины оказывает не выбор в пользу оригинального или неоригинального абатмента, а особенности самой нагружаемой имплантационной системы. Micro-gap between the placed implant and the abutment plays an important clinical part in the bone loss. Depending on the micro-gap width, its localization and stability under oblique load, we can predict the prognosis of the implant survival under conditions of constant microbial contamination. However, a non-original abutment with relevant quality certificates is also presented at the dental market in addition to the original one. The prospect of its using requires in-depth study. The aim of this study is to compare the micro-gap values at the conical connection of implants from different systems with the original and non-original abutment under oblique load. . Implants and standard abutments of three implant systems were selected for the study: Straumann BL (Switzerland), BioHorizons Tapered Internal (USA), Nobel Biocare CC (Switzerland), as well as non-original abutments of the ADM Dental system (Russia). During the experiment, an oblique loading of 150, 300 and 450 N was applied by the finite element method, and the micro-gap width and the horizontal abutment deflection from the initial axis were measured. The DTW (Dynamic Time Warping) package of the Python programming language was used to analyze the...

BACKGROUND: Periimplantitis causes implant loss, which reduces the quality of dental treatment. The effect of periimplantitis treatment on the immune response, particularly the chemiluminescent activity of neutrophilic granulocytes, is unclear. The paper addresses this issue, as well as improvements in periimplantitis treatment approaches. AIM: To assess the biocompatibility of implants removed from the inflammation site and treated with Air Flow and laser. MATERIALS AND METHODS: Three types of implant surface were assessed: anodized titanium dioxide (TiO2); sand-blasted, large grit, acid-etched (SLA); and resorbable blast media (RBM). Implants were removed in patients with confirmed periimplantitis, followed by an air-powder abrasive surface treatment with Air Flow and chlorhexidine, using a YSGG laser with a wave length of 2,780 nm. New (out of the box) implants were used as a control. Biocompatibility was assessed by the synthesis of primary and secondary reactive oxygen species (ROS) by neutrophils; the intensity and kinetics of synthesis were examined using chemiluminescence analysis. RESULTS: Lucigenin- and luminol-dependent chemiluminescence of neutrophils was assessed following in vitro incubation with SLA, RMB, and TiO2 implants removed in patients with confirmed periimplantitis and treated with Air Flow and chlorhexidine. The study found a decrease in the time to maximum and an increase in the maximum intensity and area under the curve of spontaneous and zymosan-induced chemiluminescence of neutrophils, regardless of the studied implant type. Changes in the zymosan-induced chemiluminescence of neutrophils following incubation with implants were greater than changes in spontaneous chemiluminescence, resulting in a higher activation index. No significant changes in neutrophil chemiluminescence were observed after in vitro incubation with laser-treated SLA, RMB, and TiO2 implants. CONCLUSION: SLA, RMB, and TiO2 implants removed in periimplantitis patients and treated with Air Flow and chlorhexidine have low biocompatibility. However, Air Flow-treated RBM implants show relatively superior biocompatibility than SLA and TiO2 implants, which is attributed to the decreased synthesis of primary and secondary ROS by neutrophils during in vitro incubation. The degree of ROS synthesis by neutrophils during incubation with laser-treated implants corresponds to that of the control, indicating increased biocompatibility of laser-treated implants. Laser-treated TiO2 implants had the lowest neutrophil activation during incubation, determining their maximum biocompatibility among the studied implants.