Tooth cyst: why it does not resolve with antibiotics and how it is treated in Tashkent

Where does a cyst come from and how does it differ from a granuloma?

It all starts with the death of the pulp - the neurovascular bundle inside the tooth. The cause is deep caries that has reached the nerve, trauma with a bruised tooth, overheating during treatment for a crown, or leakage under an old filling. The dead tissue in the canal decomposes, bacteria multiply unhindered in the space where neither immune cells nor drugs from the bloodstream reach, and through a hole at the top of the root, the products of this decay enter the bone. The body responds in the only available way: it builds a barrier around the lesion and at the same time dissolves the bone around it, making way for inflammation.

Then the process goes step by step. First, a granuloma is formed - a small area of ​​​​inflammatory tissue at the apex of the root. Then cavities appear in it, and it turns into cystogranuloma. Finally, the cavities merge into one, are lined with epithelium and form a real cyst with a membrane and liquid contents inside. The key point here is the membrane: it fences off the contents from the bone so reliably that the body’s defense mechanisms cease to reach it, and the cyst itself is able to grow slowly, dissolving the bone around the perimeter.

• Radicular cyst - the most common, grows at the apex of the root of a dead tooth
• Residual cyst - remains in the bone after tooth extraction, if the shell is not removed
• Follicular cyst - forms around the crown of an unerupted tooth, most often a wisdom tooth
• Eruption cyst in children - a soft bluish bulge over an erupting tooth, usually goes away on its own
• Keratocyst and other rare formations grow aggressively and require separate tactics

Why doesn't anything hurt for years?

The bone does not have pain receptors inside itself, and chronic inflammation at the root apex develops slowly and without tissue tension. Therefore, a typical cyst does not manifest itself in any way: the tooth does not react to cold and hot - there is nothing to react to, the nerve in it has long since died - it does not hurt when chewing and looks normal in appearance, especially if it is under a crown. The person is sure that this tooth is “treated and does not bother”, and this condition can last five, ten or more years.

• Discomfort or heaviness when biting on this particular tooth, often barely noticeable
• The tooth has changed color - it has become grayer or darker than its neighbors, this is a sign of dead pulp
• Periodic appearance and disappearance of a small pimple on the gum - fistulous tract
• Unpleasant taste or odor that appears when you press on the gums
• The feeling that the tooth is “higher” than the rest and interferes with closure
• Periodic exacerbations every few months, each of which goes away on its own or after a course of medication

Fistula deserves a separate discussion. When the pressure in the lesion increases, the contents find a way out and create a channel through the bone and mucous membrane to the outside. From this moment on, the pain disappears - the lesion is constantly drained, and the tension is relieved. People perceive this as recovery and live for years with a spot on the gum that appears and then gets delayed. In fact, a fistula is not a healing process, but a chronic drainage: the bone continues to break down, just without pain. It is these teeth that most often end up having to be removed, although ten years earlier they could have been safely preserved.

Survey: what needs to be done

1. Осмотр и опрос: врач выясняет, лечили ли зуб раньше, был ли он под коронкой, была ли травма, и проверяет реакцию на постукивание и надавливание на десну.
2. Проверка жизнеспособности пульпы — холодовая проба или электроодонтодиагностика. Мёртвый зуб не реагирует, и это ключевой довод в пользу того, что очаг связан именно с ним, а не с соседним.
3. Прицельный снимок зуба — базовое исследование, показывает очаг просветления у верхушки корня, качество пломбировки канала и наличие штифта.
4. Ортопантомограмма — обзорный снимок обеих челюстей, нужен чтобы увидеть все очаги сразу и оценить соседние зубы.
5. КЛКТ — трёхмерное исследование, без которого today не планируют сложное лечение. Она показывает истинный объём кисты, сохранность костных стенок, отношение очага к гайморовой пазухе и к нижнечелюстному каналу, а также дополнительные необработанные каналы в корне.
6. Гистологическое исследование оболочки после её удаления — окончательный диагноз и исключение редких агрессивных образований.

CBCT is especially important for the upper lateral teeth and lower chewing teeth. The roots of the upper molars often rest directly on the bottom of the maxillary sinus, and a cyst growing nearby can lift or destroy this thin bone plate - then unilateral odontogenic sinusitis with constant congestion and an unpleasant odor is added to the dental problem, which is unsuccessfully treated with drops and rinses. For the lower teeth, the situation is different: the mandibular canal runs nearby with a nerve that gives sensitivity to the lip and chin, and before surgery you need to know exactly where it is located in relation to the lesion.

The main misconception: antibiotic and cyst

The confidence that a course of antibiotics can remove a cyst rests on real observation: after such a course it really does become easier. The swelling subsides, the pain goes away, the temperature returns to normal. This is a logical, but incorrect conclusion - since it feels good, it means the problem is solved. In reality, something else happened: the medicine suppressed the bacteria in the tissues around the lesion, that is, it extinguished the exacerbation. The source of infection itself—necrotic tissue inside the canal—remained untouched, because it is in principle impossible to reach it through the blood.

• There is no blood supply in a dead tooth, so medicine does not flow from the blood into the canal
• The cyst shell isolates the contents from surrounding tissues and from immune defenses
• Bacteria in the canal live in the form of a dense film that is resistant to concentrations that are safe for the body
• Repeated courses “just in case” do not reduce the outbreak, but increase the stability of the microflora
• Each exacerbation suffered leaves behind less bone than before

There is a correct place for an antibiotic in this story, and it is quite specific: the doctor prescribes it when inflammation spreads beyond the bone - with severe swelling, fever, deterioration of the general condition, and also in some situations before and after surgery. This is an auxiliary measure that buys time and reduces the risk of complications. But in no case is it a treatment for a cyst, and taking such a drug on your own without examination only blurs the picture, delaying real treatment for months.

How is it really treated?

The key to treatment is not the cyst, but the canal. The doctor’s task is to remove the source: mechanically treat the entire canal system, rinse it with antiseptics, remove the bacterial film and hermetically seal the space so that bacteria have nowhere to live and nothing to feed on. If this can be done efficiently, the lesion in the bone in many cases decreases and is replaced by normal bone on its own, without any surgery. That is why modern dentistry in most cases begins not with an incision, but with work inside the tooth.

1. Эндодонтическое лечение или перелечивание: снятие коронки и старой пломбы, извлечение прежнего пломбировочного материала и штифта, поиск всех каналов, в том числе пропущенных ранее.
2. Обработка и обильное промывание каналов, при необходимости — временное заполнение препаратом на основе гидроксида кальция на несколько недель.
3. Постоянная герметичная пломбировка каналов и качественное восстановление коронковой части, чтобы бактерии не попали внутрь заново через негерметичную пломбу.
4. Контрольные снимки через 6, 12 и при необходимости 24 месяца: заживление кости идёт медленно, и судить о результате раньше полугода бессмысленно.
5. Резекция верхушки корня с ретроградной пломбировкой — когда очаг не уменьшается, канал невозможно пройти из-за штифта или вкладки, либо киста слишком велика. Через небольшой доступ убирают верхушку корня вместе с оболочкой и закрывают срез корня со стороны кости.
6. Цистэктомия — полное удаление оболочки кисты, при больших полостях иногда с заполнением дефекта костнозамещающим материалом.
7. Удаление зуба — когда корень треснул, разрушение зашло слишком далеко или зуб не подлежит восстановлению. Оболочку при этом обязательно убирают of лунки, иначе она останется в кости и продолжит расти.

Why an untreated cyst is dangerous and how to prevent it

As long as the cyst is small, the situation is completely reversible. The problems begin when it grows over the years. The cavity increases due to the dissolution of the surrounding bone, and at some point the bone support ceases to be sufficient not only for the diseased tooth, but also for its neighbors. The roots of adjacent teeth can begin to dissolve, the bone becomes thinner, and all this happens without a single pain signal.

• Periodic exacerbations with flux, facial swelling and fever
• Diffuse purulent inflammation of the soft tissues of the face and neck - a life-threatening condition
• Cyst growth into the maxillary sinus with chronic unilateral sinusitis
• Resorption of the roots of adjacent teeth and their mobility
• Significant bone loss that would require implantation to subsequently require bone grafting
• Pathological fracture of the lower jaw with very large cysts is a rare but real complication

Prevention here is surprisingly simple and consists of three points. The first is not to delay treatment of deep caries and pulpitis: a cyst does not appear on a healthy tooth, it always has a background. The second is not to consider a tooth with canal treatment a closed topic: the quality of that work can only be assessed by an image, and old canals, filled decades ago, often turn out to be not completely treated. The third is a survey photo once every one and a half to two years, and more often if there are crowns and pins. This is the only way to see a lesion several millimeters in size, when it can still be removed by canal treatment rather than surgery.