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Dental avulsion

life science Maturity 11-13 Next article →

Dental avulsion is a serious medical emergency involving the complete displacement of a tooth from its socket in the alveolar bone. This injury usually results from physical trauma, such as falls, road traffic accidents, or sports-related injuries. When a tooth is knocked out, the periodontal ligament (PDL)—the connective tissue that anchors the tooth to the jaw—becomes torn. The management of an avulsed tooth is critical because the speed and method of treatment directly affect the long-term prognosis. For permanent teeth, the primary goal is successful replantation, which is the process of returning the tooth to its original socket.

The biological success of replantation depends entirely on the survival of the PDL cells remaining on the root surface. These cells require a very specific environment to stay alive. They need a stable internal cell pressure (osmolality) of 280–300 mOs and a pH of 7.2. When the tooth is in the mouth, the blood supply provides necessary nutrients like glucose, calcium, phosphate, and potassium. Once the tooth is avulsed, this supply is severed. Within 15 minutes, most stored metabolites are depleted. If the tooth remains outside the body for more than 60 minutes, the prognosis becomes poor because the cells begin to die.

To prevent cell death, two main threats must be managed: cell crushing and the loss of normal cell metabolism. Cell crushing occurs if the delicate root surface is touched by fingers or scrubbed with a brush. It can also happen if the tooth hits a hard surface like glass or cardboard during transport. To avoid this, the tooth must always be grasped by the enamel on the crown. One should never touch the root. If the tooth is dirty, it should be rinsed gently with a physiological saline solution. Agitating the tooth in the storage medium is a safer way to remove debris than scrubbing.

If immediate replantation is not possible, the tooth must be stored in an environment that mimics the tooth socket. Proper storage media include cold milk or the patient's own saliva. These substances help maintain the necessary pH and nutrient levels. If the tooth is not replanted within 40 minutes, the chances of a favorable outcome decrease. If the root cells die, the body may undergo a process called replacement root resorption. During this process, the body's immune system treats the dead root as foreign material and literally eats it away. This can lead to ankylosis, where the tooth fuses to the jawbone.

There is a vital distinction between treating permanent teeth and deciduous, or baby, teeth. Avulsed deciduous teeth should never be replanted. Replanting a baby tooth carries a high risk of damaging the developing permanent tooth germ located underneath. This damage can result in tooth dilaceration, impaction, or a deviation from the proper eruption path for the adult tooth. Consequences of replanting primary teeth also include pulp necrosis, crown discoloration, and external root resorption. Because of these risks, the management of primary teeth focuses on protecting the permanent dental crypt rather than returning the tooth to the socket.

When a patient reaches a dentist, the clinician must perform a thorough examination of both the mouth and the outside of the face. The dentist will administer a local anesthetic to minimize discomfort and irrigate the socket with saline to remove any blood clots. Once the tooth is replanted, it is usually stabilized using a splint. A splint is a device made of flexible wire, nylon fishing line, or composite material that holds the tooth against unaffected teeth. For most cases, this stabilization lasts for two weeks. However, if there is an associated alveolar fracture, a more rigid splint might be required for up to four weeks.

Prevention is an important part of managing dental trauma risks. Contact sports pose a significant danger, and wearing a mouthguard can reduce the risk of injury. However, mouthguards are less effective if they are not fitted properly to the wearer's teeth. Certain dental alignments, such as class II malocclusions with an increased overjet of more than 4 mm, also increase the risk of trauma. An orthodontist can correct these issues to help protect the teeth. Additionally, factors like a short upper lip, incompetent lips, or mouth breathing can be risk factors for injury. Maintaining good oral hygiene with a 0.12% chlorhexidine gluconate mouthwash is also recommended during recovery.

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