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Dental extraction

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Dental extraction
Surgical extraction of an impacted molar
ICD-9-CM23.0-23.1
MeSHD014081

A dental extraction (also referred to as tooth extraction, exodontia, exodontics, or informally, tooth pulling) is the removal of teeth from the dental alveolus (socket) in the alveolar bone. Extractions are performed for a wide variety of reasons, but most commonly to remove teeth which have become unrestorable through tooth decay, periodontal disease, or dental trauma, especially when they are associated with toothache. Sometimes wisdom teeth are impacted (stuck and unable to grow normally into the mouth) and may cause recurrent infections of the gum (pericoronitis). In orthodontics if the teeth are crowded, sound teeth may be extracted (often bicuspids) to create space so the rest of the teeth can be straightened. The decision to extract teeth for orthodontic reasons should only be made by an orthodontist, so the correct decision is made.

Procedure

Extractions could be categorised into non-surgical (simple) and surgical, depending on the type of tooth to be removed and other factors. For the steps involved in these procedures, please see below.

A dental x-ray image (radiograph) showing the shape and number of roots of the molars which cannot be observed in the mouth directly.

Assessment and special investigations

A comprehensive history taking should be performed to find out the pain history of the tooth, patient’s medical history and history of previous difficult extractions.[1] The tooth should be assessed clinically i.e. checked visually by the dentist.[1] Pre-extraction radiographs are not always necessary but are often taken to confirm the diagnosis and hence appropriate treatment plan. [1] Radiographs also help in visualising the shape and size of roots which are beneficial in planning the extraction.[1] All this information will aid the dentist in foreseeing any difficulties and hence prepare appropriately.[1]

In order to obtain permission from patient for extraction of tooth the dentist should explain; other treatment options available, what is involved in the dental extraction procedure, the potential risks of the procedure and the benefits of the procedure.[1] The process of gaining consent should be documented in clinical notes.[1]

Mark Roback, a Navy dentist from the Military Sealift Command (MSC) hospital ship USNS Mercy (T-AH 19), speaking to his patient through an interpreter, tells her that the injection he is giving.

Giving local anaesthetic

Before extracting a tooth, the dentist would deliver local anaesthetic to ensure the tooth and surrounding tissues are numb before they start the extraction.[1] There are several techniques to achieve numbness of the tooth including

  • infiltration - injection containing local anaesthetic is delivered into the gum near the root tip of the tooth to be extracted. This allows the local anaesthetic to to penetrate through the bone, eventually reaching the nerve bundle of the tooth to be extracted.[1]
  • nerve block - injection containing local anaesthetic is delivered to an earlier branch of a nerve. For example, the inferior alveolar nerve block can be used to anaesthetise all the lower teeth.[1]

The two most commonly used local anaesthetics in the UK are lidocaine and articaine.[2] Prior to injection, topical anaesthetic gel or cream, such as lidocaine or benzocaine, can be applied to the gum to numb the site of the injection up to a few millimetres deep.[1] This should reduce the discomfort felt during the injection and thus help to reduce patient anxiety.[1]

Dental extraction forceps.

Removal of tooth

Extraction forceps are commonly used to remove teeth. Different shaped forceps are available depending  on the type of tooth requiring removal, what side of the mouth (left or right) it is on and if it is an upper or lower tooth. The beaks of the forceps must grip onto the root of the tooth securely before pressure is applied along the long axis of the tooth towards the root.[1]

Different movements of the forceps can be employed to remove teeth. Generally, while keeping downwards pressure attempts to move the tooth towards the cheek side (buccal) and then the opposite direction (palatal or lingual) are made to loosen the tooth from its socket.[1] For single, conical-rooted teeth such as the incisors, rotatory movements are also used.[1] A ‘figure of eight’ movement can be used to extract lower molars.[1]

Dental elevators could be used to aid removal of teeth. Various types are available that have different shapes. Their working ends are designed to engage into the space between the tooth and bone of the socket.[1] Rotatory movements are then made to dislodge the tooth from the socket.[1] Another similar looking but sharper instrument that can be used is a luxator; this instrument can be used gently and with great care to c to cut the ligament between the tooth and its boney socket (periodontal ligament).[1]

Achieving haemostasis

Biting down on a piece of sterile gauze over the socket will provide firm pressure to the wound. Normally this is sufficient to stop any bleeding and will promote blood clot formation at the base of the socket.[3]

The source of any bleeding can either be from soft tissues (gingiva and mucosa) or hard tissue (the bony socket).[3] Bleeding of soft tissues can be controlled by several means including suturing the wound (stitches) and/ or using chemical agents such as tranexamic acid, ferric sulphate and silver nitrate.[3] Bony bleeding can be arrested by using haemostatic gauze and bone wax.[3] Other means of achieving haemostasis include electrocautery.[3]

Providing post-operative instructions

Post-operative instructions should be given to a patient after an extraction to prevent further bleeding of socket and infection.[1] The advice listed below is usually given verbally and in written form;

  • avoid rinsing mouth for 24 hours to prevent dislodging the blood clot
  • avoid smoking for 24 hours to reduce risk of infection or development of a dry socket
  • avoid carrying out strenuous exercises
  • after 24 hours has passed use warm salty mouthwashes especially after meals to keep the wound clean
  • if the socket starts to bleed bite down on gauze or clean handkerchief for about 20 minutes, if the bleeding continues seek professional help

It is good practice to provide contact details for further help and out-of-hours care especially if bleeding cannot be controlled within patient’s ability.[1]   

Reasons

Extracted wisdom tooth that was horizontally impacted
Extracted tooth

The most common reason for extraction is tooth damage, due to breakage or decay. There are additional reasons for tooth extraction:

  • Severe tooth decay or infection (acute or chronic alveolar abscess, such as periapical abscess – collection of infected material [pus] forming at the tip of the root of a tooth).[4] Despite the reduction in worldwide prevalence of dental caries, it is still the most common reason for extraction of (non-third molar) teeth, accounting for up to two thirds of extractions.[5]
  • Severe gum disease, which may affect the supporting tissues and bone structures of teeth.
  • Treatment of symptomatic impacted wisdom teeth, who have or cause certain diseases such as nonrestorable caries or cysts.[6]
  • Preventive/prophylactic removal of asymptomatic impacted wisdom teeth. Although many dentists remove asymptomatic impacted third molars,[7][8] both American and British Health Authorities recommend against this routine procedure, unless there is evidence for disease in the impacted tooth or the near environment.[9] The American Public Health Association, for example, adopted a policy, Opposition to Prophylactic Removal of Third Molars (Wisdom Teeth), because of the large number of injuries resulting from unnecessary extractions.[10]
  • Supernumerary teeth which are blocking other teeth from coming in.
  • Supplementary or malformed teeth.
  • Fractured teeth.
  • Cosmetic: to remove teeth of poor appearance, unsuitable for restoration.
  • Teeth in the fracture line.
  • In preparation for orthodontic treatment (braces). In this instance, what is customarily extracted, in patients diagnosed with "crowded teeth", are the upper two and lower two adult premolar teeth. Note that in the orthodontic literature (see the American Journal of Orthodontics) this standard practice of extraction of healthy adult teeth has been a subject of heated controversy since its invention in 1940 by American orthodontist Charles Tweed. According to doctors who oppose the procedure, premolar extraction stunts the growth of the jaws and can lead, either immediately or later in life, to severe health consequences. Extraction patients have reported symptoms such as sleep apnea, TMJ, TMD, dysfunctional swallowing and speech difficulty, all due to the resultant narrowed palate and inadequate space for the tongue. In 1986, Susan Brimm sued her orthodontist for the severe jaw dysfunction caused by teeth extraction and won a settlement of 1.3 million dollars: the highest sum ever awarded for dental malpractice. The American Board of Orthodontics responded by paying for and commissioning a series of research articles to deny all consequences. The procedure continues in the 2lst century, although since the law suit, the percentage in the United States has substantially lowered to 25% of all cases. In Asia, the extraction rate in orthodontics is rising, and is now estimated to be used in up to 80 percent of all extraction cases.[11]
  • Teeth which cannot be restored endodontically.
  • Prosthetics; teeth detrimental to the fit or appearance of dentures.[12]
  • Head and neck radiation therapy, to treat and/or manage tumors, may require extraction of teeth, either before or after radiation treatments.
  • Lower cost, compared to other treatments.[13]: 98 
  • Medically unnecessary extraction as a form of physical torture.[14]
  • It was once a common practice to remove the front teeth of institutionalized psychiatric patients who had a history of biting.[15]

Types

Dental extraction forceps commonly used on teeth in the maxillary arch

Extractions are often categorized as "simple" or "surgical".

Simple extractions are performed on teeth that are visible in the mouth, usually with the patient under local anaesthetic, and require only the use of instruments to elevate and/or grasp the visible portion of the tooth. Typically the tooth is lifted using an elevator, and using dental forceps, rocked back and forth until the periodontal ligament has been sufficiently broken and the supporting alveolar bone has been adequately widened to make the tooth loose enough to remove. Typically, when teeth are removed with forceps, slow, steady pressure is applied with controlled force.

Molar cut up during surgical extraction - the curvature of the three roots (top right) prevented simple extraction

Surgical extractions involve the removal of teeth that cannot be easily accessed, for example because they have broken under the gum line or because they have not erupted fully. Surgical extractions almost always require an incision. In a surgical extraction the doctor may elevate the soft tissues covering the tooth and bone, and may also remove some of the overlying and/or surrounding jawbone tissue with a drill or osteotome. Frequently, the tooth may be split into multiple pieces to facilitate its removal.

Anticoagulant use

Studies have shown that there is a correlation between consumption of anticoagulant drugs after dental extractions and the amount of bleeding. In one such review, oral anticoagulants were prescribed to multiple subjects, all of whom were undergoing dental surgery. 89 out of 990 subjects (9%) had delayed postoperative bleeding, and 3.5% of these cases were not controlled by local measures (‘serious cases’).[16] Other studies have reported greater numbers of patients with minor post-operative bleeding.[17] However, it is difficult to standardise bleeding, as the definitions used to categorise the extent of the bleed differ from study to study. However, the majority of studies concur that there is little risk of a major bleed if a patient is regularly consuming oral anticoagulants at the time of a simple dental extraction.[citation needed]

For simple extractions, therapeutic anticoagulation can be continued, as the bleeding risk is not high[18][19][20] and the risk of a thromboembolism caused by a temporary withdrawal from the anticoagulant is much higher than that of a serious bleed following the extraction[21] However, for complex extractions (three or more teeth, or multiple adjacent teeth), the risk of bleeding is higher,[22] and the dentist should consult the patient’s doctor. Patients undergoing a course of treatment using anticoagulants should notify their dentist when organising the procedure. An individual treatment plan should be drawn up for the patient, and the patient’s doctor should be contacted to confirm the anticoagulant being used, and the dose type.[22] The patient’s INR should also be taken into account. When the patient has an INR of 4.0 or over, the patient should be referred to a specialist.[21] The risk of haemorrhage is increased in the elderly (especially after post-surgical dental extractions), as they are more susceptible to dental caries and periodontal diseases.[23] This should also be taken into account by the dentist. Studies found that rivaroxaban impose a high risk of bleeding when compared to the other oral anticoagulants, in contrast to Dabigatran, which was found to have fewer postoperative bleeding incidents.[24]

To increase the effectiveness of oral anticoagulant drugs, bleeding risks can be further minimized by the usage of collagen sponges and sutures and rinsing 5% tranexamic acid mouthwash four times a day.[23]

Overall, patients utilizing long-term anticoagulant therapies such as warfarin or salicylic acid do not need to discontinue its use prior to having a tooth extracted. But your warfarin levels, your INR must be checked on the day of or the day before your extraction. The extraction should be performed utilizing the least traumatic extraction procedures,[25] and patients should make certain to tell their dentist or oral surgeon about any medications they take before the procedure.

Antibiotic use

Antibiotics can be prescribed by dental professionals to reduce risks of certain post-extraction complications. There is evidence that use of antibiotics before and/or after impacted wisdom tooth extraction reduces the risk of infections by 70%, and lowers incidence of dry socket by one third. For every 12 people who are treated with an antibiotic following impacted wisdom tooth removal, one infection is prevented. Use of antibiotics does not seem to have a direct effect on manifestation of fever, swelling, or trismus seven days post-extraction. In the 2013 Cochrane review, 18 randomized control double-blinded experiments were reviewed and, after considering the biased risk associated with these studies, it was concluded that there is moderate overall evidence supporting the routine use of antibiotics in practice in order to reduce risk of infection following a third molar extraction. There are still reasonable concerns remaining regarding the possible adverse effects of indiscriminate antibiotic use in patients. There are also concerns about development of antibiotic resistance which advises against the use of prophylactic antibiotics in practice.[26]

Post-extraction healing

Exodontia of first molar, one hour later.

Immediately following the removal of a tooth, bleeding or oozing very commonly occurs. Pressure is applied by the patient biting on a gauze swab, and a thrombus (blood clot) forms in the socket (hemostatic response). Common hemostatic measures include local pressure application with gauze, and the use of oxidized cellulose (gelfoam) and fibrin sealant. Dental practitioners usually have absorbent gauze, hemostatic packing material (oxidized cellulose, collagen sponge), and suture kit available.[27] Sometimes 30 minutes of continuous pressure is required to fully arrest bleeding. Talking, which moves the mandible and hence removes the pressure applied on the socket, instead of keeping constant pressure, is a very common reason that bleeding might not stop. This is likened to someone with a bleeding wound on their arm, when being instructed to apply pressure, instead holds the wound intermittently every few moments. Coagulopathies (clotting disorders, e.g. hemophilia) are sometimes discovered for the first time if a person has had no other surgical procedure in their life, but this is rare. Sometimes the blood clot can be dislodged, triggering more bleeding and formation of a new blood clot, or leading to a dry socket (see complications). Some oral surgeons routinely scrape the walls of a socket to encourage bleeding in the belief that this will reduce the chance of dry socket, but there is no evidence that this practice works.[citation needed]

The most serious post extraction healing complication is that slow or halted healing caused by the use of Bisphosphonates which can cause OsteoChemoNecrosis of the bone.

The chance of further bleeding reduces as healing progresses, and is unlikely after 24 hours. If bleeding occurs beyond 8 –12 hours, it is referred as post-extraction bleeding. The blood clot is covered by epithelial cells which proliferate from the gingival mucosa of socket margins, taking about 10 days to fully cover the defect.[28] In the clot, neutrophils and macrophages are involved as an inflammatory response takes place. The proliferative and synthesizing phase next occurs, characterized by proliferation of osteogenic cells from the adjacent bone marrow in the alveolar bone. Bone formation starts after about 10 days from when the tooth was extracted. After 10–12 weeks, the outline of the socket is no longer apparent on an X-ray image. Bone remodeling as the alveolus adapts to the edentulous state occurs in the longer term as the alveolar process slowly resorbs. In maxillary posterior teeth, the degree of pneumatization of the maxillary sinus may also increase as the antral floor remodels.[citation needed]

Post-extraction bleeding

Post-extraction bleeding is bleeding that occurs 8–12 hours after tooth extraction.[29] Various factors contribute to post-extraction bleeding.[30][31][32]

Local factors

  • Laceration of blood vessels
  • Osseous bleeding from nutrients canal/ central vessels
  • Inflammation
  • Infection
  • Traumatic extraction
  • Failure of patient to follow post-extraction instructions

Systemic factors

Type of bleeding

1. Primary prolonged bleeding

This type of bleeding occurs during/immediately after extraction, because true haemostasis has not been achieved. It is usually controlled by conventional techniques, such as applying pressure packs or haemostatic agents onto the wound.

2. Reactionary bleeding

This type of bleeding starts 2 to 3 hours after tooth extraction, as a result of cessation of vasoconstriction. Systemic intervention might be required.

3. Secondary bleeding

This type of bleeding usually begins 7 to 10 days post extraction, and is most likely due to infection destroying the blood clot or ulcerating local vessels.

Interventions

There is no clear evidence from clinical trials comparing the effects of different interventions for the treatment of post-extraction bleeding.[33] In view of the lack of reliable evidence, clinicians must use their clinical experience to determine the most appropriate means of treating this condition, depending on patient-related factors.[33] When a dental practitioner is deciding how to control post-extraction bleeding, many other factors have to be taken into account:

  • Surgical area
  • Location of bleeding
  • Size of wound
  • Extent of bleeding
  • Accessibility of bleeding site
  • Time of bleeding

If on examining the patient, the blood pressure is below 100/60 and the heart rate is over 100bpm, a hypovolaemic shock should be suspected and the patient should be sent to hospital for IV blood transfusion.[citation needed]

Post-extraction bleeding interventions can be categorized into two main groups:

Local interventions

(i) Surgical interventions

  • Involve suturing the bleeding site. Sutures aid socket closure and help bring the gingival tissues together. Interrupted or horizontal mattress are both recommended.
  • If bleeding is secondary to trauma to a blood vessel, the patient may need to be sent to hospital as large vessel may require ligation and smaller vessels cauterized

(ii) Non-surgical haemostatic measures

  • Involve the use of drugs, sealants, adhesives, absorbable agents, biologics, and combination of products

(iii) Combination of both

  • A resorbable haemostatic pack, such as oxidised cellulose or collagen sponge, in addition to suturing are recommended if the source of bleeding is from the bone within the socket.

2. Systemic interventions

This is important for patients who have systemic cause for bleeding. Usually, local haemostatics do not work well on limiting their bleeding because they only result in temporary cessation of bleeding.[citation needed] Antibiotics can be prescribed to manage any bleeding associated with a spreading infection.

Complications

  • Infection: The dentist may opt to prescribe antibiotics pre- and/or post-operatively if he or she determines the patient to be at risk of infection.
  • Prolonged bleeding: The dentist has a variety of means at his disposal to address bleeding; however, small amounts of blood mixed in the saliva after extraction are normal, even up to 72 hours after extraction. Usually, however, bleeding will almost completely stop within eight hours of the surgery, with only minuscule amounts of blood mixed with saliva coming from the wound. A gauze compress will significantly reduce bleeding over a period of a few hours.
File:Fat-man.jpg
Example of post-operative swelling following third molar (wisdom teeth) extractions.
  • Swelling: Often dictated by the amount of surgery performed, to extract a tooth (e.g., surgical insult to the tissues, both hard and soft, surrounding a tooth). Generally, when a surgical flap must be elevated (i.e., the periosteum covering the bone is thus injured), minor to moderate swelling will occur. A poorly cut soft tissue flap, for instance, where the periosteum is torn off rather than cleanly elevated off the underlying bone, will often increase such swelling. Similarly, when bone must be removed using a drill, more swelling is likely to occur.
  • Bruising: Bruising may occur as a complication after tooth extraction. Bruising is more common in older people or people on aspirin or steroid therapy. It may take weeks for bruising to disappear completely.
  • Sinus exposure and oral-antral communication: This can occur when extracting upper molars (and in some patients, upper pre-molars). The maxillary sinus sits directly above the roots of maxillary molars and pre-molars. There is a bony floor of the sinus, dividing the tooth socket from the sinus itself. This bone can range from thick to thin, from tooth to tooth, from patient to patient. In some cases it is absent and the root is, in fact, in the sinus. At other times, this bone may be removed with the tooth, or may be perforated during surgical extraction. The doctor typically mentions this risk to patients, based on evaluation of radiographs showing the relationship of the tooth to the sinus. The sinus cavity is lined with a membrane called the Sniderian membrane, which may or may not be perforated. If this membrane is exposed after an extraction, but remains intact, a "sinus exposed" has occurred. If the membrane is perforated, however, it is a "sinus communication". These two conditions are treated differently. In the event of a sinus communication, the dentist may decide to let it heal on its own, or, may need to surgically obtain primary closure—depending on the size of the exposure and the likelihood of the patient to heal. In both cases, a resorbable material called "gelfoam" is typically placed in the extraction site to promote clotting and serve as a framework for granulation tissue to accumulate. Patients are typically provided with prescriptions for antibiotics that cover sinus bacterial flora, decongestants, and careful instructions to follow during the healing period.
  • Nerve injury: This is primarily an issue with extraction of third molars, but can occur with the extraction of any tooth should the nerve be close to the surgical site. Two nerves are typically of concern, and are found in duplicate (one left and one right): 1. the inferior alveolar nerve, which enters the mandible at the mandibular foramen and exits the mandible at the sides of the chin from the mental foramen. This nerve supplies sensation to the lower teeth on the right or left half of the dental arch, as well as sense of touch to the right or left half of the chin and lower lip. 2. The lingual nerve (one right and one left), which branches off the mandibular branches of the trigeminal nerve and courses just inside the jaw bone, entering the tongue and supplying sense of touch and taste to the right and left half of the anterior 2/3 of the tongue as well as the lingual gingiva (i.e., the gums on the inside surface of the dental arch). Such injuries can occur while lifting teeth (typically the inferior alveolar), but are most commonly caused by inadvertent damage with a surgical drill. Such injuries are rare and are usually temporary, but depending on the type of injury (i.e., Seddon classification: neuropraxia, axonotmesis, & neurotmesis), can be prolonged or even permanent.
  • Displacement of tooth or part of the tooth into the maxillary sinus (upper teeth only). In such cases, the tooth or tooth fragment must almost always be retrieved. In some cases, the sinus cavity can be irrigated with saline (antral lavage) and the tooth fragment may be brought back to the site of the opening through which it entered the sinus, and may be retrievable. At other times, a window must be made into the sinus in the Canine fossa—a procedure referred to as a "Caldwell-Luc".
Alveolar osteitis of a socket after tooth extraction. Note lack of blood clot in socket and exposed alveolar bone.
  • Dry-socket (Alveolar osteitis) is a painful phenomenon that most commonly occurs a few days after the removal of mandibular (lower) wisdom teeth. It typically occurs when the blood clot within the healing tooth extraction site is disrupted. More likely,[34] alveolar osteitis is a phenomenon of painful inflammation within the empty tooth socket because of the relatively poor blood supply to this area of the mandible (which explains why dry-socket is usually not experienced in other parts of the jaw). Inflamed alveolar bone, unprotected and exposed to the oral environment after tooth extraction, can become packed with food and debris. Dry-socket typically causes a sharp and sudden increase in pain commencing 2–5 days following the extraction of a mandibular molar, most commonly the third molar.[35] This is often extremely unpleasant for the patient; the only symptom of dry-socket is pain, which often radiates up and down the head and neck. A dry-socket is not an infection, and is not directly associated with swelling because it occurs entirely within bone – it is a phenomenon of inflammation, within the bony lining, of an empty tooth socket. Because dry-socket is not an infection, the use of antibiotics has no effect on its rate of occurrence. There is some evidence that rinsing with chlorhexidine before or after extraction or placing chlorhexidine gel in the sockets of extracted teeth provides a benefit in preventing dry-socket, but potential adverse effects of chlorhexidine have to be considered.[36] The risk factor for alveolar osteitis can dramatically increase with smoking after an extraction.
  • Bone fragments: Particularly when extraction of molars is involved, it is not uncommon for the bones which formerly supported the tooth to shift and in some cases to erupt through the gums, presenting protruding sharp edges which can irritate the tongue and cause discomfort. This is distinguished from a similar phenomenon, where, broken fragments of bone or tooth left over from the extraction can also protrude through the gums. In the latter case, the fragments will usually work their way out on their own. In the former case, the protrusions can either be snipped off by the dentist, or eventually the exposed bone will erode away on its own.
  • Trismus: Trismus, also known as lockjaw, affects functions of the oral cavity by restricting opening of the mouth. A double blind, clinical study was done to test the effect of two different medications on post-extraction trismus. The patients who received a corticosteroid by IV had a statistically significant lower level of trismus when compared to patients receiving an NSAID by IV or no medication.[37]
  • Loss of a tooth: If an extracted tooth slips out of the forceps, it may be swallowed or inhaled. The patient may be aware of swallowing it, or, they may cough, which suggests inhalation of the tooth. The patient must be referred for a chest X-ray in hospital if a tooth cannot be found. If it has been swallowed, no action is necessary as it usually passes through the alimentary canal without doing any harm. But if it has been inhaled, an urgent operation is necessary to recover it from the airway or lung before it causes serious complications such as pneumonia or a lung abscess.[12]
  • Luxation of the adjacent tooth: The application of force during the extraction procedure must strictly be limited to the tooth that requires the extraction. Most cases of surgical extraction procedures require that the forces are diverted from the tooth itself to areas such as bone surrounding the tooth to ensure adequate bone removal before proceeding any further in the extraction procedure. Either way, the forces applied by various instruments during both simple and complicated surgical procedure may loosen the teeth present both in front of or behind the tooth depending upon the impact direction and location of the force being applied and that happening only if the forces divert from the actual tooth that needs extraction. Such deleterious forces may weaken the anchorage of adjacent teeth from within their bony socket, and hence result in weakening of the adjacent teeth.
  • Extraction of the wrong tooth: Misdiagnosis, altered tooth morphology, faulty clinical examination, poor patient history, undetected/unmentioned previous extractions that may predispose the operator to consider another tooth to be a replicate of the one previously extracted are a few causes of extraction of a wrong tooth.
  • Osteonecrosis: Osteonecrosis of the jaw is the slow destruction of bone in an extraction site. A case control study of 191 cases and 573 controls were used to understand the relationship between osteonecrosis of the jaw and prior usage of bisphosphonate drugs, which are commonly prescribed to treat osteoporosis. All of the participants were over 40 years of age, mostly female, and had been taking bisphosphonates for six months or longer. The presence of osteonecrosis of the jaw was reported by dentists' previous diagnosis of the participating case and control patient's medical records. Reports showed that women using bisphosphonates for more than two years are ten times more likely to experience osteonecrosis of the jaw, while women who have taken bisphosphonates for less than two years are four times more likely to suffer from osteonecrosis of the jaw when compared to women who were not taking bisphosphonates. Therefore, it is extremely important to report all medications used to the dentist before an extraction, so that osteonecrosis can be avoided.[38]

Assessing nerve injury risk

There are specific factors that need to be accounted for when considering nerve injury after removal of mandibular third molars (bottom wisdom teeth). Position of the molar is an important risk factor with regards to inferior alveolar nerve injuries. Horizontally-impacted molars pose a higher risk of nerve injury, as the depth of the impacted molar is increased. Furthermore, the most important factor for inferior alveolar nerve-injury prediction is the proximity of the root tips to the mandibular canal.[39]

Pain management

Many drug therapies are available for pain management after third molar extractions including NSAIDS (non-steroidal anti-inflammatory), APAP (acetaminophen), and opioid formulations. Although each has its own pain-relieving efficacy, they also pose adverse effects. According to two doctors, Ibuprofen-APAP combinations have the greatest efficacy in pain relief and reducing inflammation along with the fewest adverse effects. Taking either of these agents alone or in combination may be contraindicated in those who have certain medical conditions. For example, taking ibuprofen or any NSAID in conjunction with warfarin (a blood thinner) may not be appropriate. Also, prolonged use of ibuprofen or APAP has gastrointestinal and cardiovascular risks.[40] There is high quality evidence that ibuprofen is superior to paracetamol in managing postoperative pain.[41]

Socket preservation

Socket preservation or alveolar ridge preservation (ARP)[42] is a procedure to reduce bone loss after tooth extraction to preserve the dental alveolus (tooth socket) in the alveolar bone. At the time of extraction a platelet rich fibrin (PRF)[43] membrane containing bone growth enhancing elements is placed in the wound or a graft material or scaffold is placed in the socket of the extracted tooth.[44][45] The socket is then directly closed with stitches or covered with a non-resorbable or resorbable membrane and sutured.[46]

Atraumatic extraction

Atraumatic extraction is a novel technique for extracting teeth with minimal trauma to the bone and surrounding tissues. It is especially useful in patients who are highly susceptible to complications such as bleeding, necrosis, or jaw fracture. It can also preserve bone for subsequent implant placement.[47] Techniques involve minimal use of forceps, which damage socket walls, relying instead on luxators, elevators and syndesmotomy.[citation needed]

Replacement options for missing teeth

Following dental extraction, a gap is left. The options to fill this gap are commonly recorded as Bind, and the choice is made by dentist and patient based on several factors.

Treatment option Advantages Disadvantages
Bridge Fixed to adjacent teeth Drilling usually required on one or both sides of the gap if conventional bridge (average lifespan about 10 years). Conservative bridge (average lifespan about 5 years) preparation may cause minimal damage to adjacent teeth. Expensive and complex treatment, not suited to all situations, e.g., large gaps in the back of the mouth Alveolar bone will still resorb, and eventually a gap may show under bridge.
Implant Fixed to jawbone. Maintains alveolar bone, which would otherwise undergo resorption. Usually a long-term lifespan. Expensive and complex, requiring specialist. May involve other procedures such as bone grafting. Relatively contra-indicated in tobacco smokers.
Denture Often a simple, quick, and relatively cheap treatment compared to bridge and implant. Not usually any drilling of other teeth required. It is far easier to replace several teeth with a denture than place multiple bridges or implants. Denture is not fixed in mouth. Over time worsens periodontal disease unless there is good level of oral hygiene, and may damage soft tissues. Potential for slightly accelerated resorption of alveolar bone compared to no denture. Potential for poor tolerance in persons with over-sensitive gag reflex, xerostomia, etc.
Nothing (i.e., not replacing the missing tooth) Often the choice due to cost of other treatment or lack of motivation for other treatments. Part of a shortened dental arch plan, which revolves around the fact that not all teeth are required to eat comfortably, and only the incisors and premolars need be preserved for normal function. This is usually the choice taken if the reason of dental extraction is due to impacted wisdom teeth or orthodontics because of limited space. The alveolar bone will slowly resorb over time once the tooth is lost. Potential esthetic concern. Potential for drifting and rotation of adjacent teeth into the gap over time.

History

illustration demonstrating the use of the dental key for extracting teeth.

Historically, dental extractions have been used to treat a variety of illnesses. Before the discovery of antibiotics, chronic tooth infections were often linked to a variety of health problems, and therefore removal of a diseased tooth was a common treatment for various medical conditions. Instruments used for dental extractions date back several centuries. In the 14th century, Guy de Chauliac invented the dental pelican,[48] which was used through the late 18th century. The pelican was replaced by the dental key[49] which, in turn, was replaced by modern forceps in the 19th century.[50] As dental extractions can vary tremendously in difficulty, depending on the patient and the tooth, a wide variety of instruments exist to address specific situations. Rarely, tooth extraction was used as a method of torture, e.g., to obtain forced confessions.[51]

Until the early 20th century in Europe, dental extractions were often made by traveling dentists in town fairs. They sometimes had musicians with them playing loud enough to cover the cries of pain of the people having their teeth extracted. In 1880 in Pyrénées-Orientales (France), one of these traveling dentists claimed to have extracted 475 teeth in one hour.[citation needed]

See also

References

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Further reading

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