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Автор: Administrator   

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14.02.2014 13:45

Этиология пульпита

Пульпит (pulpitis) — воспалительный процесс в пульпе зуба в результате воздействия на нее различных раздражителей.

Наиболее частая причина пульпита - микроорганизмы и продукты их жизнедеятельности, попадающие в пульповую камеру из кариозной полости через дентинные канальцы. Основными возбудителями воспаления пульпы являются кокковые формы бактерий, в частности гемолитические и негемолитические стрептококки, диплококки, стафилококки, грамположительные палочки, стрептобациллы, лактобациллы и дрожжевые грибы.

Инфицирование пульпы возможно при осложненном течении кариеса через отверстия отростков одонтобластов, а также ретроградным путем из глубокого пародонтального кармана, гайморовой пазухи при ее воспалении, остеомиелите, либо периодонтите в рядом стоящем зубе. Возможно проникновение инфекции в пульпу по кровеносным и лимфатическим путям при острых инфекционных заболеваниях.

Вторым по частоте этиологическим фактором развития пульпита может явиться острая или хроническая травма: механическая, физическая и химическая.

Острая механическая травма возникает при отломе части коронки зуба с обнажением рога пульпы, при переломе корня, при травмировании сосудисто-нервного пучка в области верхушки корня (например, при ударе), вскрытии рога пульпы при лечении кариеса или препарировании зуба под коронку.

К механической хронической травме пульпы относятся патологическая стираемость зубов, которая может привести к обнажению рога пульпы, завышение пломбы при лечении глубокого кариеса, давление дентикля.

Физическая травма может привести к перегреву пульпы во время препарирования кариозной полости или зуба под коронку. Это может произойти при использовании тупых боров или при работе на турбинной машине в течение длительного времени без водяного охлаждения. Наложение амальгамовой пломбы без надежной изолирующей прокладки также приводит к хроническому физическому раздражению пульпы, так как металл является хорошим проводником термических раздражителей.

Химическая травма пульпы может произойти в результате действия следующих факторов:

• использование сильнодействующих антисептиков в высокой концентрации при обработке глубокой кариозной полости (3%-го раствора хлорамина, 96%-го раствора спирта, 3%-го раствора перекиси водорода, эфира);

• постановка постоянной пломбы без лечебной прокладки при лечении глубокого кариеса, применение пломбировочных материалов, обладающих токсичным действием, без изолирующих прокладок (акрилоксид, карбодент, эвикрол и др.);

• применение лечебных прокладок с выраженной щелочной средой pH-12—14 (кальмецин, кальцин-паста), которые могут привести к некрозу пульпы;

• добавление кристаллов тимола, йодоформа, нитрата калия в прокладку;

• применение аллергенных пломбировочных материалов и лекарственных препаратов без учета неблагоприятного аллергологического статуса пациента (пластмасса, цинк-эвгеноловая паста, сульфаниламиды. антибиотики и др.), лечение глубокого кариеса у людей немолодого возраста с низкой реактивностью организма с декомпенсированной формой кариеса.

К причинам пульпита можно отнести дентикли и петрификаты в полости зуба. Петрификаты пульпы зуба могут быть единичными или множественными, то есть наблюдается очаговое или диффузное отложение минеральных солей, которые могут раздражать нервные окончания пульпы и сдавливать сосудистые образования, нарушая микроциркуляцию. Отложение солей кальция прослеживается главным образом вдоль крупных сосудов и нервов, что, несомненно, может привести к возникновению самопроизвольных болей в зубе, особенно при смене положения головы. Дентикли — это дентиноподобные образования различной величины и формы, которые образуются как в коронковой, так и в корневой пульпе в результате хронической механической травмы зуба либо при общесоматических хронических заболеваниях. Различают свободнолежащие, пристеночные и интерстициальные ("замурованные") дентикли.


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Обновлено 14.02.2014 15:18
 
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