Actual problems in dentistry Actual problems in dentistry Проблемы стоматологии 2077-7566 2412-9461 48809 10.18481/2077-7566-21-17-4-125-130 ОРТОПЕДИЧЕСКАЯ СТОМАТОЛОГИЯ ORTHOPEDIC DENTISTRY ОРТОПЕДИЧЕСКАЯ СТОМАТОЛОГИЯ THE LABORATORY STUDY OF RESIN-BONDED FIXED PARTIAL DENTURES IN THE POSTERIOR REGION (IN PREMOLAR-SIZED SPANS). PART 2. MECHANICAL TESTING ЛАБОРАТОРНОЕ ИЗУЧЕНИЕ АДГЕЗИВНЫХ МОСТОВИДНЫХ ПРОТЕЗОВ В БОКОВЫХ ОТДЕЛАХ ЗУБНЫХ РЯДОВ. ЧАСТЬ 2. МЕХАНИЧЕСКИЙ ЭКСПЕРИМЕНТ Петрикас Олег Арнольдович Petrikas Oleg Arnoldovich opetrikas@mail.ru Цыганков Константин Викторович Tsigankov Kobstantin Viktorovich konstantin.tsigankov@yandex.ru Петрикас Инга Владимировна Petrikas Inga Vladimirovna petrikas@inbox.ru

кандидат медицинских наук;

candidate of medical sciences;

 Тверской государственный медицинский университет, г. Тверь Тверь Россия Tver State Medical University Tver Russian Federation Тверской государственный медицинский университет, г. Тверь Тверь Россия Tver State Medical University Tver Russian Federation Тверской государственный медицинский университет Тверь Россия Тверской государственный медицинский университет Тверь Russian Federation Тверской государственный медицинский университет Тверь Россия Tver State Medical University Tver Russian Federation 28 12 2021 28 12 2021 17 4 125 130 03 12 2021 10 12 2021 https://dental-press.ru/en/nauka/article/48809/view

Предмет. К настоящему времени многочисленные ретроспективные исследования по использованию адгезивных мостовидных протезов (АМП) доказали их надежность. Тем не менее, до сих пор остаются вопросы о конструкции боковых АМП при замещении одного и двух зубов. Целью настоящего исследования явилось изучение in vitro разрушающих усилий литых АМП с жестко-подвижным соединением (fixed/movable) на малом ретейнере из прессованной керамики при замещении одного или двух отсутствующих премоляров. Методология. В лаборатории исследовали усилия по разрушению литых жестко-подвижных АМП на акриловых фантомных моделях, имитирующих включенные де-фекты в один и два премоляра. Оценивали характер разрушения АМП и разрушающие нагрузки в ньютонах путем сравнения средних значений по критерию t (Стьюдента). Изучалось 4 группы АМП в зависимости от вида опорных элементов и величины включенного дефекта. Результаты. Наименьшая разрушающая нагрузка (1017,0 ± 49,0 Н) наблюдалась в группе с двумя отсутствующими зубами. В группах с окклюзионой накладкой толщи-ной 1 мм наблюдалась ее деформация. В группах с окклюзионой накладкой толщиной 2 мм наблюдался частичный откол керамического малого фиксатора. Нарушений фиксации адгезивных накладок либо литой коронки в качестве больших фиксаторов не наблюдалось. Выводы. Для разрушения жестко-подвижного АМП, замещающего два отсутствующих зуба, требуется существенно меньше нагрузки, чем для АМП, замещающего один отсутствующий зуб. Нарушений фиксации больших фиксаторов не наблюдалось. Адгезивные накладки оказались так же эффективны, как и литые коронки в качестве большого ретейнера.

Background. To date, numerous retrospective studies on the use of resin-bonded fixed partial dentures (RBFPD) have proven their reliability. Nevertheless, there are still questions about the design of posterior resin-bonded fixed partial dentures for replacing 1 and 2 missing teeth. Objectives. The present research was an in vitro study of the fracture strength of resin-bonded fixed partial dentures (RBFPD) with movable connector on the heat-pressed ceramic minor retainer when replacing 1 or 2 missing premolars. Methods. The laboratory research was carried out to study the fracture strength of fixed/movable RBFPD on acrylic moulds with a space equivalent to one or two premolars. The nature of RBFPD destruction and breaking loads in newtons were assessed by comparing the mean values according to the t-test. We studied 4 groups of RBFPD, depending on the type of retainer and the number of lost teeth. Results. The smallest fracture strength (1017.0 ± 49.0 N) was observed in the group with two missing teeth. In groups with 1mm thick occlusal rest, its deformation was observed. In the groups with 2 mm thick occlusal rest, partial fracture of the ceramic minor retainer was observed. Fixation loss of the adhesive wings or cast crowns as a large retainer was not observed. Conclusions. Fixed/movable RBFPD replacing two missing premolars are less fracture resisted then when replacing one missing premolar. Fixation loss of the large retainers was not observed. Adhesive wings were as effective as cast crowns as a large retainer.

 адгезивные мостовидные протезы с жестко-подвижным соединением гибридные адгезивные мостовидные протезы большой ретейнер малый ретейнер окклюзионная накладка fixed/movable resin-bonded fixed partial dentures hybrid bridges large retainer small retainer occlusal rest

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