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Jawbone Cavitation and Its Implication in Implant Dentistry

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Jawbone Cavitation and Its Implication in Implant Dentistry I industry report Jawbone cavitation and its implication in implant dentistry Author_Prof. Dr Mauro Marincola, Italy _Introduction and other bones. Dr G.V. Black described this cavitation process in 1915 as a progressive process in the jawbone A cavity is a hole in a tooth, whereas a cavitation is a in which bone cells are destroyed, generating large cav- hole in bone. Unlike most tooth cavities, bone cavita- itation areas within the jawbones.1 Black found it strik- tions cannot be detected by simply looking at the bone, ing that this disease produces vast jawbone damage rather they must be determined radiographically and without redness in the gingiva, pain, swelling of the jaw, the interpretation thereof requires an expert eye, con- or a rise in body temperature. In effect, this disease sequently many cavitations are missed. process is produces small blockages or infarctions of the small blood vessels in the jawbones, leading to areas of In the last several years, the term “cavitation” has dead bone or osteonecrosis. These dead areas are today been used to describe various bone lesions that appear called neuralgia-inducing cavitational osteonecrosis both as empty holes in the jawbones and holes filled lesions. with dead bone and fibrous marrow. The term “cavita- tion” was created in 1930 by an orthopaedic researcher The results of recent research by Dr Boyd Haley, for- who described a disease process in which a deficiency in mer Chairman of the Department of Chemistry at the blood flow into the area resulted in a hole in the jawbone University of Kentucky, show that the cavitation tissue Fig. 1_Only a cavitation that has formed with additional calcification around a well-defined border will be visualized on X-ray. Observe the incapsulated extranous body. Fig. 2_An explored channel might be counted as only one cavitation when it actually developed from more than one unhealed extraction site. Larger cavitations can extend below the Fig. 1 Fig. 2 mandibular nerve. Figs. 3a & b_15 mm mesio-distal and 10 mm vertical bone cavitation filled with ␤-TCP graft. The distal hole was a third of dimension and a Short Implant (Bicon) could be placed immediately. Fig. 3a Fig. 3b implants 20 I 1_2014 Fig. 4 Fig. 5 Fig. 6 samples he tested contained toxins that significantly in- deficiencies. Cavitational lesions are prompted by many Fig. 4_A trained eye is needed to hibit one or more of the five basic body enzyme systems factors. Many of them affect the occlusion or blockage recognise the circular bone cavitation necessary for the production of energy.2 These toxins, of small blood vessels of the jawbone. In addition to mi- mesial to the lower right molar. which are most likely metabolic waste products of nor risk factors, the most prominent are alcoholism, Observe the capsulation, the thin anaerobic bacteria, may produce significant systemic heavy smoking, long-term high-dose cortisone use, crestal cortical and the lack of effects, as well as play an important role in localised dis- oestrogen use, pancreatitis or pregnancy. trabecular geometry. ease processes that negatively affect the blood supply Fig. 5_Intra-oral view of the in the jawbone. There are indications that when these Research shows that 45–94 per cent of all cavita- cavitation region. No defect can be toxins combine with certain chemicals or heavy metals tional lesions are found at wisdom teeth extraction observed clinically. (e.g. mercury), much more potent toxins may form. sites.3 These areas contain many small blood vessels, Figs. 6 & 7_Depth gauge making them an ideal developing site for bony lesions, demonstrating the absence of _Factors associated with cavitational bone as these vessels are easily affected by trauma in surgical trabecular bone. The distal extension lesion development procedures. As a result, osteonecrosis can develop. In of the hole is aprox. 10 mm. addition, numerous local anaesthetic solutions contain Cavitational lesions can be caused by many factors, vasoconstrictors (particularly epinephrine). Vasocon- most likely a combination of these will characterise oc- strictors are applied in order to restrict or reduce the currence, type, size, progression and growth patterns. blood supply to bone, teeth or gingival tissue, thus pro- longing the anaesthetic effect and minimizing bleeding. _Initiating factors As many local anaesthetics are injected in the wisdom teeth area, their application increases the occurrence of Probably the major initiating factors are of dental cavitational lesions in this region. origin in terms of physical, bacterial and toxic traumas. Another frequent cause of ischemic osteonecrosis in – Physical trauma: tooth extractions, dental injections, the jawbone is improper endodontic treatment. Few en- periodontal surgery, root canal procedures, grinding dodontic treatments are performed by a specialised and clenching, electrical trauma from dissimilar metal dentist and the result is that the root canals become restorations, incomplete removal of periodontal liga- loaded with anaerobic bacteria or chemically toxic ma- ment after tooth extraction, overheat from high- terial used for the canal filling. The pathogenetic sub- speed drilling. stance reaches the bone, eventually causing loss of bone – Bacterial trauma: periodontal disease, cysts, ab- density and holes inside the cancellous bone (Fig. 1). scesses, root canal bacteria from non-vital teeth, in- Since there is no longer a sufficient blood supply, the fected wisdom teeth. body cannot fight the toxins and the bony structure de- – Toxic trauma: dental materials, root canal toxins, generates into necrotic bone and fibrous marrow. anaesthetics with vasoconstrictors, chemical toxins. As a reminder, neuralgia-inducing cavitational os- _Risk factors teonecrosis is not so much an infection in the bone as necrosis or gangrene (dead tissue) of the bone marrow Predisposing factors encompass antiphospholipid as a result of impaired blood flow (ischemia). A cavita- antibody syndrome; blood clotting disorders (throm- tion often develops because of incomplete healing after bophilia and hypofibrinolysis); age; changes in atmos- routine extraction. pheric pressure owing to occupation; Gaucher’s dis- ease; gout; haemodialysis; homocystinaemia; hyperlip- When the periodontal ligament is not entirely re- idaemia; lymphoma or bone dysplasia; osteoporosis; moved from the socket after extraction, the surround- physical inactivity; radiation or chemotherapy; ing bone receives no notification that the tooth is gone. rheumatoid arthritis; sickle-cell anaemia; systemic lu- The continued presence of any portion of the ligament pus erythematosus; and thyroid or growth hormone gives the biological message to the surrounding jaw- implants 1_2014 I21 I industry report Fig. 8_Solid, healthy bone must be reached to allow the normal regeneration of bone. When infection or necrosis remain throughout the socket and adjacent bone, with or without condensing osteitis, healing will rarely ever be completed. Figs. 9 & 10_The hole is filled with a synthetic graft material (Synthograft) after elimination of fibrous marrow and disinfection of the cavity. Fig. 7 Fig. 8 Fig. 9 Fig. 10 bone that all is well, and no new bone growth is needed. take place and new bone cells will fill in the cavitations. Bone cells thus do not start new growth and then mi- Neither antibiotic injections into the bone nor laser grate through a barrier naturally designed to limit such treatments will stop the progressive necrosis if not all growth. The jawbone determines that if the ligament is debris has been thoroughly curetted out of the cavita- still there, the tooth must be there as well. tion. Since the periodontal ligament does not extend to The next treatment step is a bone grafting procedure the upper edge of the extraction site, new bone growth to fill the cleaned and disinfected cavity. If the cavitation activity will not be inhibited at the top of the socket, and is limited to 5–6 mm in diameter, a plateau press fitted a characteristic thin cap of bone will eventually extend root form implant can be placed into the grafting mate- over the extraction hole. Larger cavitations often have rial immediately. Otherwise, the implant will be placed only a cap of gingival tissue over them. Even the thin in a larger grafted area after three months of healing overlying cap of bone does not form in these cases. In (Figs. 3a & b). routine dental extraction, portions of the periodontal ligament will sometimes be more strongly attached to _Clinical implications the tooth than the bone and be removed along with the tooth. When partially removed in this fashion, the hap- The following case is representative of many other hazard absence of the ligament will permit equally hap- cases I have encountered during 25 years of clinical ex- hazard growth of bone, resulting in the wide variety of perience in numerous clinics in various countries. A 52- cavitation shapes and sizes (Fig. 2). year-old female patient came to the practice with 19 missing teeth in both the maxillae and the mandible. The _Treatment second premolars and first molars had been extracted between five and 12 years ago, after incorrect en- Surgery is often necessary to clean out a cavitational dodontic treatment. She noted that the molars had had site properly and thoroughly, for there is no other way abscesses and the premolars had fractured a few years to remove dead bone. The key to bone healing and re- after the poor endodontic treatment. generation is the removal of the necrotic tissue. If the necrotic tissue is not thoroughly removed, the necrosis The treatment plan was to insert four short implants will spread and cause further destruction to the bone, to replace the second premolars and first molars of the nerves and blood vessels. This kills teeth in the process, mandible. The dental panoramic tomogram showed a for they are cut off from their blood supply. Once the circular formation of 5–6 mm in diameter mesial to the necrotic tissue has been cleaned out, healing can then second molar root on the right side of the mandible implants 22 I 1_2014 industry report I Figs.
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