Oral Surgery Indication & Contra-indication Of Extraction PDF

Oral Surgery Indication & contra-indication of extraction Lec. 2 EXTRACTION OF TEETH (EXODONTIA):- Extraction of teeth is the most important part of minor oral surgery and the most common procedures to general dental practitioner (dentist). Definition: -...

Oral Surgery Indication & contra-indication of extraction Lec. 2 EXTRACTION OF TEETH (EXODONTIA):- Extraction of teeth is the most important part of minor oral surgery and the most common procedures to general dental practitioner (dentist). Definition: - Exodontia is a painless removal of teeth from their bony alveolar socket with relatively minimal amount of trauma to the investing or surrounding tissues, so that the wound may heal without postoperative problems. Basically, we have two methods of extraction:- 1- Intra-alveolar extraction (forceps extraction). 2- Trans-alveolar extraction (surgical extraction). In forceps extraction which is enough for extraction in most of cases consist of removing the tooth or root by the use of forceps or elevators or both. While in trans-alveolar extraction we dissect the tooth or root form its bony attachment by rising a flap and removal of some of the bone surrounding the roots, which are then removed by the use of elevators and/or forceps. INDICATIONS OF Extraction: - There are many indications for tooth extraction, if conservative treatment has either failed or is not indicated, a tooth may have to be extracted. The reasons for extraction of teeth are based on the presence of local pathology, the feasibility of restorative procedure (function of the dentition as a whole and the patient's attitude and education). Although the modern dentistry tries and takes all measures to preserve and maintain teeth in the oral cavity, there are still a variety of general indications for removing teeth. 1 Indications of teeth extraction. 1- Severe caries: - This is the most common reason to remove a tooth. Badly carious teeth that are beyond restoration should be removed. Badly carious teeth result in deterioration of the oral hygiene resulted in bad oral hygiene and bad smell in addition to that sharp edges of the carious teeth leads to repeated trauma and ulceration to the mucosa and the tongue, in addition to pain during eating and drinking. Untreated teeth with caries may end with pulpitis, periapical pathology etc... 2- Severe periodontal disease: - Severe and extensive periodontal disease is a common reason for tooth removal, in chronic periodontitis there is excessive bone loss and mobility in the tooth. As a rough guide, loss of about half of the normal alveolar bone or extension of pockets to the bifurcation of the roots of posterior teeth and hypermobility of the teeth means that extraction of the involved tooth is necessary. Patient with advanced periodontitis may complain of mild to severe throbbing pain in case of development of Paradental abscess. 3- pulp pathology: - For example acute pulpitis or chronic pulpitis, non-treatable pulpal lesion. if endodontic therapy wasn't possible or if the tooth isn’t amenable for endodontic treatment, extraction is indicated. 4- Apical pathology:- Periapical lesions like periapical abscess, periapical granuloma, cyst. If the teeth fail to respond to all conservative treatment to resolve apical pathology due to technical reasons or other causes such teeth are indicated for extraction. 5- Orthodontic reasons:- During the course of orthodontic treatment, tooth or teeth maybe extracted for:- a) Therapeutic extraction e.g. extraction of upper first premolar for treatment of malposed upper canine and extraction of teeth to provide space for teeth alignment. b) Malposed teeth: teeth which erupted out of the line of arch are difficult to clean and not amenable for orthodontic treatment are indicated for extraction. 2  c) Preventive extraction, means that during mixed dentition period (permanent and deciduous teeth), dental surgeon may extract few deciduous teeth to prevent malocclusion and all these extractions should be done after proper evaluation by specialist orthodontic. 6-Prosthetic considerations:- Extraction of teeth is indicated for:- 1) Providing efficient dental prosthesis. 2) To provide better design for success of partial denture, few teeth maybe extracted. 3) Solitary tooth or non-strategic tooth to enable the patient to have complete denture e.g. full mouth clearance. 7- Impacted teeth.- Retention of un erupted teeth beyond the normal time of eruption may sometimes be responsible for: - a) Vague facial pain. b) Periodontal problems of the adjoining teeth. c) Tempromandibular joint problems. d) Bony pathology e.g. cyst (dentisgerous cyst), tumor, pathological fracture. e) May predispose to anterior teeth crowding f) Significant infection (pericornoitis) e.g., partially erupted third molar. 8-Supernumerary teeth The teeth maybe impacted or malposed and such teeth may predispose to malocclusion, periodontal disturbances, facial pain, bony pathology (cyst), aesthetic problems and preventing the eruption of adjacent teeth. 9- Tooth in the line of fracture of the jaws:- This tooth maybe extracted if:- a) It is a source of infection at the site of the fracture. b) The tooth itself is fractured. c) Interfere with fracture reduction. d) Interfere with healing of fracture. 3 10- Teeth in relation with pathological conditions:- They are indicated for extraction if they are involved in:- a) Cyst formation. b) Neoplasm (tumour). c) Osteomyelitis (Infection of bone). d) Pyogenic granuloma And the tooth interfere with complete surgical removal of the lesion the tooth should be extracted. 11-Retained roots Retained roots may remain embedded in the bone without problems for a long period, but sometimes removal of such roots maybe necessary, for example, root maybe at the sub mucosal level producing recurrent ulceration under the denture, sometimes root fragments may be involved in initiation of bony lesions like osteomyelitis, cystic lesion or neoplasm, if such fragments are in close relation to the neurovascular bundle (e.g. inferior dental nerve of the mandible) the patient may complain of facial pain or numbness in the area supplied by that nerve. As a general rule, very small fragments maybe left alone and that patient should be kept under periodic observation, and all other root fragments are indicated for removal. 12- prior to irradiation :-( before radiotherapy) Irradiation is one of the methods of treating oral carcinomas and teeth which cannot be kept in a sound condition should be removed before irradiation, trauma (extraction) with superadded infection will lead to development of osteoradionecrosis of the jaw bone which is unpleasant complication and difficult to be treated. 13-Focal sepsis:- Sometimes teeth or a tooth may appear sound clinically, but on radiographic examination the tooth may appear to be considered as a foci of infection (teeth associated with periapical pathology or periodontal problems), these teeth or tooth should be extracted in certain conditions e.g. heart surgery; heart valve replacement, kidney transplant, eye Surgery 4 14- Aesthetic:- Poor aesthetic, severely stained (tetracycline, fluorosis) attrition or hypoplastic (hypoplasia) of enamel or dentine and they cannot be restored may be indicated for extraction. Contra-indications of teeth extraction. In general, the contra-indications are subdivided into; 1- Local contra-indications. 2- Systemic contra-indications. Local contra-indications: - (L.C s) There are several L.C s to extractions of indicated teeth:- 1- Acute and uncontrolled infection:- Extraction in the presence of acute and uncontrolled infection may lead to spread of infection locally or systemically leading to many complications some of them are dangerous and life threatening (e.g. cavernous sinus thrombosis, mediastinitis, Ludwig's angina) and acute periapical abscess and facial abscess especially in medically compromised patient. In addition to that, limitation of mouth opening especially in lower wisdom tooth infection. 2- Previous radiotherapy:- Previous therapeutic radiation in oral and maxillofacial region for treatment of cancer lead to fibrosis and decreased vascularity of the tissue or area of extraction and end with a condition in the bone called osteoradionecrosis 3- Teeth located within area of tumour: - Especially in vascular lesion or malignant tumor should not be extracted because extraction may lead to dissemination of the tumor, unhealed socket and postoperative complications, for example, bleeding postoperatively and intraoperative. 5 Systemic contra-indications:- Systemic contra-indications preclude extraction because the patient's systemic health is such that the ability to withstand the surgical work may be compromised. So extraction should be postponed until the severity of the problem has been resolved and maybe arranged after consultation with the physician to perform extraction safely without complications so caution is advised in the following conditions:- 1- Severe uncontrolled metabolic disease, e.g. uncontrolled diabetes, end-stage renal disease. 2- Uncontrolled leukaemia and lymphomas. 3- Severe uncontrolled cardiac disease, e.g. myocardial infarction, unstable angina pectoris, dysrhythmias. 4- Severe uncontrolled hypertension. 5- Pregnancy. 6- Bleeding disorder e.g. haemophilia, platelet disorder, patient on anticoagulants. 7- Patients who take a variety of medications e.g. patient on steroid and immunosuppressive drugs, cancer and chemotherapy. 8- Uncontrolled epilepsy. Pre-extraction evaluation:- P.E.E is very valuable and necessary for successful extraction practice. Hurry and inadequate P.E.E of the case may lead to many embarrassing intra-operative problem for the operator, in addition to the postoperative problems to the patient, 6 P.E.E include:- 1- Clinical preoperative evaluation. 2- Radiological evaluation 1-Clinical P.E.E also includes:- a) General evaluation. b) Local evaluation. A -General evaluation includes:- General impression of the patient. History of general diseases, Nervousness and orientation General oral hygiene. Gingival inflammation, calculus, neglected mouth. b- Local factors evaluation Includes:- Clinical examination of the accused tooth. Adjoining structures. Access to the tooth. This includes the mouth opening, location of the tooth (e.g. buccally malposed, in standing) may present difficulty in positioning the dental forceps for extraction, so you may remove such a tooth surgically. Tooth mobility: The mobility of the tooth to be extracted should be assessed preoperatively, greater than normal mobility is frequently seen with severe periodontal disease, but sometimes it maybe because of the underlying pathology like neoplasm Condition of the tooth: - e.g. a) Carious destruction. b) The presence of large restoration. c) Presence or absence of the adjoining teeth. d) Non-vital tooth. e) State of the supporting tissue. f) Shape, position, long axis and size of the crown. 7  g) Attrition. Good P.E.E resulted from correction of data collected from history, clinical examination, radiographs and laboratory aids in addition to that P.E.E need good knowledge and experience in the basic sciences e.g. anatomy, physiology, pathology. In general, P.E.E may help you in: - a) Determine the method of extraction and type of anaesthesia. b) Reduce the time spend for extraction. c) Reduce the intra and post-operative crisis and complications. 2- Radiological evaluation: - Preoperative clinical assessment maybe supplemented some times by preoperative radiographs, and the positive indications for preoperative radiograph are:- 1) History of difficult or unsuccessful extraction. 2) Crown with extensive caries, large restorations, non-vital tooth when diagnosis is not certain and tooth is malposed. 3) A tooth which is abnormally resistant to forceps extraction. 4) If after clinical examination you decide to remove the tooth surgically. 5) Any tooth which is in close relation to important or vital structures like neurovascular canal, maxillary sinus, mental nerve, nasal cavity. 6) Attrition teeth in elderly patient (maybe associated with hypercementosis). 7) If a tooth is partially erupted or completely unerupted or retained root. 8) Any tooth which has been subjected to trauma, fracture of the root and/or alveolar bone maybe present. 9) An isolated maxillary molar especially if it is unopposed and over erupted. The bony support of such a tooth is often weakened by the presence of maxillary sinus and this may predispose to certain of oro-anrtal communication or fracture of the maxillary tuberosity. 10) Whenever, underlying bony pathology is suspected e.g. cystic lesion, tumor. 8 11)Any systemic condition which may predispose to dental or alveolar abnormality like: - a) Osteitis deformans (Paget's disease), in which the roots are hypercementosed and ankylosed leading to difficult extraction, infection of the socket. b) Cleido-cranial dysostosis, for pseudo-anodontia (multiple impactions, hooked roots occur, supernumerary teeth). c) Patient who have received therapeutic irradiation to the jaw which may have to predispose to osteoradionecrosis. d) Osteopetrosis (marble bone disease), which cause extraction very difficult and predispose to chronic osteomyelitis. A good radiograph and careful interpretation may give or aid the operator to many factors that may cause difficult extraction, e.g.:- 1- Abnormal number and shape of roots. 2- An unfavourable root pattern. 3- Caries extending to the root mass. 4- Fracture or resorption of the root. 5- Hypercementosis of roots. 6- Ankylosis (there is no space in periodontal ligament), and sclerosis of the bone. 7- Gemination (the development of two teeth from one bud). 8- Impaction. 9- Bony sclerosis and pathological lesions. Also careful interpretation of the radiograph may also reveal or show the possibility of the following complications:- 1) Involvement of, and damage to inferior dental nerve and mental nerve e.g. on extraction of impacted lower third molar 2) The creation of oro-anrtal fistula or or-nasal communication. 3) The retention of intra-bony pathology e.g. cyst. 4) The displacement of root or tooth into maxillary sinus. 5) Fracture of maxillary tuberosity. 9