Dental emergency

Odontogenic pain

Odontogenic pain is pain associated with the teeth, originating in the dental pulp and/or the peri-radicular tissues.^[4] The following table shows the different classifications of pulp status.^[4]

Injuries to the hard dental tissues and the pulp^[2]

Injuries involving periodontal tissues ^[2]

Dental barotrauma and barodontalgia.^[6] A sudden incapacitation of diver or aviator due to barometric-induced tooth fracture or toothache, respectively, may be life-threatening to the individual and the airplane passengers.

Lost or broken filling

A fractured, ditched or dislodged filling that is broken or lost may cause discomfort or sharp pain due to jagged edges. There can be aesthetical concerns if the filling is in a visible area. Patients need to be aware of the sharp edges and ensure their tongue does not constantly apply pressure around that area, as it can cause cuts to the tongue. However, in some cases the result of the loss of a filling can cause irritation to the side of the cheek and potentially lead to an ulcer. Sharp edges can easily be dealt with by levelling the filling or tooth edges from your local dentist during the emergency appointment. Hypersensitivity issues may also arise, short sharp pain caused by exposed underlying dentine, after the deterioration of the filling material.^[2]

Reasons for the deterioration of a restoration vary in different cases, the cause may be underlying caries or it could be occlusal trauma, caused from natural dentition during mastication. The longevity of restorative materials could also be a factor; the survival rates of amalgam are usually 10–15 years, composite 7 years, while gold and ceramic fillings have over a 20-year longevity.^[2]

During the emergency appointment the dentist will need to take a set of radiographs to assess for any underlying caries, bone loss or possible abscess. The clinical examination will detect the reasons behind the failure of the restoration. Upon treatment the dentist will provide options on the tooth’s prognosis, these may include a new restoration, extraction, root canal or placement of a crown. The tooth prognosis includes the tooth’s vitality and restorability.

• Crack, fracture and mobility

A crack, fracture and the mobility of a tooth are all interrelated as the pain and symptoms experienced from a tooth that has been cracked are very similar to that of a tooth that has been fractured.^[2] A tooth crack is defined as an incomplete fracture of enamel or dentine and therefore is not usually associated with noticeable mobility.^[7] The cause of a tooth crack can be by excessive force applied to a healthy tooth or physiologic forces applied to a weakened tooth. The teeth most commonly involved are usually the lower molars, followed by the upper premolars and molars. The condition is extremely common in the age range of 30–60 years.^[2]

A diagnosis of a cracked tooth is extremely difficult. Careful history and assessment of the symptoms presented needs to be taken into account; radiographs and certain tests will be conducted in the dental office. Most common symptoms are cold sensitivity, sharp pain when using force to chew, these pain results from the release of pressure and are very important indicators of a cracked tooth. However, the symptoms may differ from various patients, subject to the depth and orientation of the crack.

Broken crown

Crowns can become broken by a fracture, non-retentive preparation, secondary caries, weak cement, excessive occlusal forces, decementation or loosening of the crown.^[7] The consequences of a crown becoming loose include the risk of ingestion and less likely, inhalation. The management of the loose crown includes immediate recementation or a replacement crown, depending on the assessment conducted by the dentist.

The factors that are taken into consideration in making this decision include the strength of the temporary crown to be placed and occlusal forces. Thus, a thorough occlusal examination is of paramount importance, strength of the cement, a strong alternative of cement should be considered. The occlusion assessment should also include the static and functional occlusion as well as the possible presence of Para functional habits, such as clenching or bruxism.

Management includes cleaning all the cement and residues, to carefully inspect for any underlying caries or fractures. Details that need to be assessed include margins, gingivae and contact points; occlusion needs to be checked in both ICP and in lateral and protrusive excursions, before the crown can be re-cemented. Stronger cement should be used than the original such as resin cements, especially in cases of heavy occlusal forces.

In some cases, immediate reconstruction of the abutment may be deemed inappropriate, if the underlying structure is deemed deficient due to caries or a fracture then this issue needs to be addressed. The treatment plan may vary with the addition of a root canal treatment or a temporary crown for the reconstruction of a new crown.

• Fracture of a porcelain veneer or a porcelain-fused-to-metal crown

Immediate management includes a chair side repair of the fractured veneer with composite material. Bonding composite to the exposed metal will involve achieving macro mechanical retention by making grooves and notches or abrading the surface. Bonding material back onto exposed porcelain involves abrading, hydrofluoric acid etching and silanating then followed by a conventional bonding procedure. Composite patch will remain a temporary solution as the longevity of composite restorations is not predictable as well as the colour of composite is not as stable as porcelain for aesthetical reasons.^[2]

Broken denture

A fracture can involve any damage to the denture. Any type of repair to the denture is much less ideal then making a new one. The ratio of fracture to a denture is a 1:3 ratio of the upper to lower.^[7]

The most common reason for fracture in a denture; is accidental dropping of the denture in the case of the lower denture, and improper fitting and stability of the denture in the upper denture.

• Techniques to prevent denture from being broken:

1. Use a basin of water in the sink, to help prevent the denture from breaking if happens to fall on a hard surface.
2. Hold the denture in non-dominant hand with a firm, but gentle grasp.
3. Do not use any powdered or abrasive cleaners, including most regular toothpastes, they are too abrasive and produce scratches on the denture surface.
4. Avoid excessive scrubbing as this can damage the denture.
5. Dry denture and place in a plastic container stored some where safe over night.

Individuals should not continue to wear a broken denture and seek the help of their dentist as soon as possible.

Broken or loose implants

Implant success is relatively high, the rate of implant survival is between 85-95%,^[8] although it is not uncommon for emergency management of a failing implant or one of its components. The failure is most likely due to infection of the implant. It is highly recommended to visit or refer patient to the specialist who provided the implant.

Late failures that occur with implants are usually due to moderate to severe bone loss, mostly located in the posterior areas of teeth and involve a multi-unit prosthesis. A fracture or decementation of a post or loosening of the abutment screw of an implant could be the result of dissolved cement, secondary caries, use of a weak post, or excessive occlusal forces.^[7] Oral home care needs to remain at a high standard, brushing twice a day for the duration of two minutes with the use of fluoridated tooth paste. Interdental cleaning once a day using either floss, interdental brushes, wood sticks. Regular dental appointments every 6 months to maintain gingival health, professional cleans, radiographs to examine the bone loss and the implant status. All the following is needed to prolong the longevity of the implant and reduce the risk of peri-implantitis.

Orofacial swelling

A swelling is a transient abnormal enlargement of a body part or area not caused by proliferation of cells but by accumulation of fluid in tissues. It can occur throughout the body (generalized), or a specific part or organ can be affected (localized). A swelling may arise intra-orally or externally around the face, jaws and neck and can be caused by trauma (hematoma, swelling due to fracture, TMJ dislocation), infection or inflammation. Swelling can occur in the gums, palate, lips, buccal space, etc. It can happen due to periodontal problems, infection, abscess, cysts, allergic reaction (anaphylactic shock), salivary gland tumour, inflammation or obstruction of salivary gland.

Cellulitis

Bacterial infection in the oro-facial region can lead to abscess and swelling. The rapid spread of this infection through connective tissue spaces, is often referred to as cellulitis. The clinical features of cellulitis are a painful, diffuse, brawny swelling. The overlying skin is red, tense and shiny. There is usually an associated trismus, cervical lymphadenopathy, malaise and pyrexia. Cellulitis usually develops quickly, over the course of hours, and may follow an inadequately managed or ignored local dental infection. If the infection spreads to involve the floor of mouth and pharyngeal spaces, then the airway can be compromised. Initially, the floor of the mouth will be raised and the patient will have difficulty in swallowing saliva; this pools and may be observed running from the patient’s mouth. This sign indicates the need for urgent management. Cellulitis involving the tissue spaces on both sides of the floor of mouth is described as Ludwig's angina ^[9] Such presentations require immediate attention.

Localised dental abscesses may be appropriately treated by intra-oral drainage via tooth extraction, opening of root canals and/or intra-oral incision and drainage. Wherever there are signs of spreading cervico-facial infection or significant systemic disturbance, however, patients should be referred urgently further management.

Pericoronitis

Pericoronitis is defined as inflammation in the soft tissues surrounding the crown of a partially erupted tooth. The acute form is characterised by severe pain, often referred to adjacent areas, causing loss of sleep, swelling of the pericoronal tissues, discharge of pus, trismus, regional lymphadenopathy, pain on swallowing, pyrexia, and in some cases spread of the infection to adjacent tissue spaces.^[10]

• Blistering disorders of oral mucosa (see vesiculobullous disease)
• oral ulceration
• Disturbed orofacial sensory or motor function

Trismus

Trismus may be defined as inability to open the mouth due to muscle spasm, but the term is frequently used for limited movement of the jaw from any cause and usually refers to temporary limitation of movement.^[7] Trismus can occur as a result of temporomandibular joint disorder, infection, cancer therapy, complicated extraction, arthritis, complication from a mandibular block and fractures.^[11]

Hemorrhage

Whilst haemorrhage from the oro-facial region may present spontaneously, particularly from gingival tissue as a result of a bleeding diathesis or a haematological abnormality such as leukaemia, the most common cause is in response to trauma or a post-operative haemorrhage following dental extraction.^[2]

Bony pathology, e.g. Infection of an odontogenic cyst

Cysts can be common lesions found in the jaw. They are defined as cavities filled with fluid or semi-fluid content, created from the resorption of bone. They can wholly or partly be lined by epithelium and connective tissue.^[12] They are not to be confused with abscesses, which are cavities filled with pus. Cysts can cause root resorption of adjacent teeth, tooth mobility and can be associated with mandibular fracture.^[13][14][15] Cyst would usually require surgical management if indicated.^[16]

Post-extraction pain and infection, or dry socket

Following a tooth extraction, if a blood clot forms inadequately in the socket or it is broken down, a painful infection may develop which is often referred to as a ‘dry socket’. It is clinically characterized by a putrid odor and intense pain that radiates to the ear and neck. Pain is considered the most important symptom of dry socket. It can vary in frequency and intensity, and other symptoms, such as headache, insomnia, and dizziness, can be present.^[17] Pre-disposing factors to dry socket include smoking, traumatic extraction, history of radiotherapy and bisphosphonate medication. A dry socket can be managed by irrigating the socket with chlorhexidine or warmed saline to remove debris followed by dressing of the socket with bismuth iodoform paraffin paste and lidocaine gel on ribbon gauze to protect the socket from painful stimuli.^[2] If pus is seen in the socket and there is localised swelling and possibly lymphadenopathy, it has become infected and can often be managed as in dry socket, but usually antibiotics should be prescribed. A radiograph is useful to see if there is a retained root or bony sequestrum, which could be the cause of the infection. Clearly, if one or both is present, further treatment is indicated.^[2]

Postoperative swelling

Mild inflammatory swelling may follow dental extractions but is unusual unless the procedure was difficult and significant surgical trauma occurred. More significant swelling usually indicates postoperative infection or presence of a haematoma. Management of infection may require systemic antibiotics or drainage. A large haematoma may need to be drained.

Loose removable appliance

Removable active appliance are used by dentist to tip teeth using screws, springs and bows of various types to correct malocclusion. The appliance can be taken out for cleaning and for adjustments made by orthodontists.^[19] If the appliance is loose in an emergency situation, the dentist can adjust the retentive component of the appliance to increase the retention of the appliance by using Adams pliers.

Fractured removable appliance

Suppose the appliance breaks, the orthodontist should be alerted as soon as possible. The wearer should not use the appliance as it could cause trauma and could pose a significant risk of airway obstruction if the wearer accidentally inhales.^[20]

Loose or fractured fixed appliance (wire or band)

There are many components to the fixed appliance which have a potential to break off if the patient chews on hard or crunchy food. Wearers should wear a mouth guard over the appliance if when playing contact sports. If one of the components is loose or comes off, the user must call the orthodontist right away.^[20] If the component is loose the dentist as an emergency treatment can cover the component with orthodontic relief wax. If the component breaks off, then the dentist can use a pair of tweezers to remove it making sure to protect the airway at all times.

Loose or Lost Ligature

Ligatures are small elastics or wires which aim to secure the archwire firmly within the brackets on the teeth. If a ligature becomes loose or lost, this can render the appliance less effective as the forces on that particular tooth are reduced. In this case, a loose elastic can be re-positioned with tweezers, ideally by an orthodontist however general dental practitioners are also able to do so. If a wire ligature becomes loose, it should be secured or replaced only by a trained orthodontist and in the meantime, if causing irritation, orthodontic relief wax should be used over any sharp ends. The patient should avoid replacing the wire ligature themselves if it is lost and should seek an appointment with their orthodontist.^[21]

Lost separator/spacer

Separator found between posterior teeth

Separators, also known as orthodontic spacers, are usually placed between posterior teeth to open up contact point prior to placing metal orthodontic bands. The separators should ideally be kept in place until the patient's next appointment in order for the orthodontic band to fit. If the separator is lost, the orthodontist should be informed and he/she can advise for a next appointment for the patient.

Protruding archwires

The archwire in fixed orthodontic appliances should be flat against the tooth, however if the wire is protruding it can cause irritation to the surrounding soft tissues. Wire benders or a dental flat plastic can be used to bend the wire into place, or if this is not possible, the protruding wire can be covered with wax.^[22] If there are significant problems, the wire can be clipped using distal end cutters, being careful to avoid inhaling or ingesting wire fragments. As a last resort measure, the whole wire and ligatures can be removed.^[23]

De-bonded bracket

De-bonded brackets, if left untreated, can result in irritation of lip and cheek in short term. If a bracket de-bonds from the tooth, the de-bonded bracket can be removed from the archwire by initially removing the ligature holding it in place. Alternatively, orthodontic wax relief can be used to secure the de-bonded bracket to the adjacent bracket as a temporary measure to prevent irritation of lip and cheek. However, it is essential to inform the orthodontist as soon as possible so that appropriate actions are taken to address the de-bonded brackets immediately.

Allergic/hypersensitivity reactions

The most common allergy in orthodontics is to nickel. Nickel is found in multiple orthodontic components, such as nickel-titanium (NiTi) archwires and stainless steel brackets. If patients are previously exposed to nickel, for example with nickel-containing jewellery, the re-exposure with orthodontic components are more likely to lead to a Type IV delayed hypersensitivity immune response.^[24] This response is usually delayed for a few days or weeks. In this case, the orthodontist must be informed immediately to make arrangements for patient to receive nickel-free components.^[25] However, such immune response to nickel is rare, as it is believed that the oral mucosa requires a much higher concentration to illicit a response compared to the skin.

Airway obstruction

When a small removable appliance or a loose component obstructs a patients airway a true medical emergency arises. If the object is visible, recline the patient and attempt to remove it while otherwise encouraging the patient to cough the object out. If this is not immediately successful call for help and an ambulance.^[21] Follow the guidelines for 'choking/aspiration' in the 'Medical Emergencies and Resuscitation' document provided by the Resuscitation Council UK.

Ingested or aspirated component

It is not unheard of to ingest an orthodontic component or appliance, usually being asymptomatic causing no harm to the patient. No treatment is required except for monitoring stools to ensure the component has passed safely. If however the patient is having symptoms of pain or vomiting, the component may be lodged in the oesophagus or oropharynx. In such situations the patient must be sent to hospital.

If the component is more than 5 cm long the patient should always be sent to A&E as there is a higher risk of obstruction or perforation of the gastrointestinal tract so removal may be advised instead of allowing the component to pass naturally.^[21] When sending a patient to hospital the referral letter must contain details regarding the components size, shape, flexibility, radio-opacity as well as information about the incident for example when it was swallowed.^[21]

Aspiration of an orthodontic component which was unable to be removed must be referred to A&E for chest radiographs and subsequent removal of the component. The referral letter again must include details as described above.^[21]