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Inflammation of the Bone Inflammation of the Bone Periapical Inflammatory Lesions

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Inflammation of the Bone Inflammation of the Bone Periapical Inflammatory Lesions Inflammatory Lesions Most common pathologic conditions of the jaws Teeth create a direct pathway for inflammatory agents and pathogens to invade the bone when Inflammatory Lesions of the Jaws caries and periodontal Steven R. Singer, DDS disease are present Inflammatory Lesions Bone Metabolism Inflammation is the Balance of bone resorption by body’s response to chemical, physical, or osteoclasts and bone deposition by microbial injury osteoblasts First, the inflammatory Osteoblasts mediate the resorptive response destroys the causative agent and activity of the osteoclasts walls off the injured Inflammatory conditions of bone exist area along a continuum, with varying clinical Second, it sets up an environment for repair features of the injured tissue Inflammation of the Bone Inflammation of the Bone Periapical Inflammatory Lesions Periodontal Osteomyelitis Lesions Pericoronitis 1 The Cardinal Signs of Inflammation Acute v. Chronic Lesions Acute Lesions Chronic Lesions Recent onset Long, insidious onset Rapid Prolonged course Pronounced pain Intermittent, low- Often with fever and grade fever Heat swelling Gradual swelling Redness Swelling Pain Loss of Function Acute v. Chronic Lesions Without a second radiograph, exposed at a different time, it is often impossible to determine if a lesion is chronic or acute. Therefore, temporal descriptors are usually omitted from radiographic descriptions Radiographic Features Location Periapical Inflammatory Lesions Epicenter of the lesion is usually at the apex May also be along the lateral root surface due to accessory canals, root fractures, or iatrogenic perforations Courtesy of USC School of Dentistry 2 Apical Rarefying Osteitis Location Periodontal Lesions Epicenter of the lesion is located at the alveolar crest Inflammatory changes in bone may extend to the apex and into the furcation of posterior teeth Periodontal Disease and Apical Rarefying Osteitis Location Osteomyelitis Usually found in the posterior mandible Involvement of the maxilla is rare, due to greater vascularity Borders Apical Rarefying Osteitis Generally poorly demarcated Blending into normal trabeculation 3 Internal Architecture Effects on Adjacent Structures Resorption will give a radiolucent Stimulation of surrounding bone, appearance to the lesion producing a sclerotic border Bone formation (osteosclerosis) will give Bone resorption, resulting in radiolucent trabeculation a denser and more areas numerous appearance Widening of the periodontal ligament Usually, lesion will present as a combination of altered density space. The greatest widening will be at the epicenter of the lesion Osteomyelitis will often yield sequestra of bone Condensing Osteitis Osteomyelitis Apical Rarefying Osteitis 4 Periapical Inflammatory Periapical Inflammatory Lesions Lesions Unacceptable Terminology Synonyms Acute apical Radicular cyst PAP or periapical periodontitis Apical periodontitis* pathology Chronic apical Apical rarefying Area periodontitis osteitis * Endo tooth Periapical abscess Sclerosing osteitis * Perio-endo lesion Periapical granuloma Condensing osteitis* Endo-perio lesion Radiology *Preferred radiographic terminology! StationTM Interrelationship of possible Apical Rarefying Osteitis and results of periapical inflammation Sclerosing Osteitis Caries Periapical abscess Osteomyelitis Acute Necrotic pulp Apical periodontitis Chronic Trauma Periapical granuloma Periapical cyst From White and Pharoah, 5th edition p.367 Apical Rarefying Osteitis and Periapical Inflammatory Sclerosing Osteitis Lesions Local response of bone secondary to pulpal necrosis or severe periodontal disease At least 60% demineralization must occur before the lesion can be seen on a radiograph. Therefore, it is inappropriate to use a radiograph as a vitality test 5 Periapical Inflammatory Periapical Inflammatory Lesions Lesions Histologically, the lesion is apical periodontitis, which is defined as a periapical abscess or periapical granuloma The reaction is initiated by toxic metabolites from the necrotic pulp Clinically, the symptoms may include pain, swelling, fever, lymphadenopathy, or may be asymptomatic Periapical Inflammatory Periapical Inflammatory Lesions Lesions Acute lesions may evolve into chronic Location ones At the apex of a tooth Therefore, it is important to note that May be along the root surface if the clinical presentation may not associated with a lateral canal or correspond with the histopathological or perforation from root canal treatment radiographic findings Periapical Inflammatory Apical Rarefying Osteitis Lesions Borders Ill-defined, gradually blending with normal trabeculation Can occasionally have a well- demarcated border 6 Periapical Inflammatory Periapical Inflammatory Lesions Lesions Internal Architecture Internal Architecture Earliest change is loss of bone density The region of the lesion closest to the resulting in widening of periodontal apex is generally lucent, while the ligament space periphery tends to be exhibit sclerotic As the lesion progresses, loss of density changes involves a larger area When the lesion is mostly lucent, the As the lesion progresses, a mixed term Apical Rarefying Osteitis is used rarefying and sclerotic appearance may When the lesion is mostly sclerotic, the be seen. term Apical Condensing Osteitis is used Periapical Inflammatory Periapical Inflammatory Lesions Lesions Internal Architecture Effects on adjacent structures When closely examined, the sclerotic Lesions may stimulate resorption or areas exhibit both increased number deposition of surrounding bone. and thickness of trabeculae The sclerotic lesion may be localized or may extend over a wider area The lesion may destroy cortical borders, such as the floor of the maxillary sinus or cause displacement or remodeling. This remodeling is called halo effect Periapical Inflammatory Halo Effect Lesions Effects on adjacent structures Chronic lesions may result in root resorption If the cortical border of the maxillary sinus is perforated, there may be a localized thickening of the schneiderian membrane. This is called mucositis 7 Root Resorption Halo Effect and Mucositis Mucositis Mucositis Periapical Inflammatory Lesions Internal Resorption Effects on adjacent structures Internal or external resorption of the root, calcification of the pulp chamber, and wide appearance of the pulp chamber may be evident 8 Internal Resorption Internal Resorption Periapical Inflammatory Periapical Inflammatory Lesions Lesions Differential Diagnosis Early lesions of Periapical Cemental Dysplasia (PCD) often have an appearance similar to that of a periapical inflammatory lesion. Pulp vitality testing must be performed to differentiate the two lesions. Idiopathic osteosclerosis 8/06 3/07 Differential Diagnosis Periapical Cemental Dysplasia 9 Periapical Cemental Dysplasia Periapical Cemental Dysplasia Idiopathic Osteosclerosis Idiopathic Osteosclerosis Case courtesy of Ohio State Case courtesy of Ohio State University College of Dentistry University College of Dentistry Idiopathic Osteosclerosis Bone Marrow Defect 10 Pericoronitis Inflammation of the tissues surrounding a partially erupted tooth. rd Usually occurs around 3 molars Starts in soft tissue surrounding erupting tooth May extend into the bone surrounding the tooth Often associated with trismus Radiographic Features of Pericoronitis Pericoronitis Location Early lesions may show no radiographic features Follicular space may be expanded around the crown. >3mm should be monitored Radiographic Features of Radiographic Features of Pericoronitis Pericoronitis Borders Internal Architecture May be ill defined Radiolucent, with thin, sparse A sclerotic border is not unusual trabeculae Increased trabeculation toward periphery 11 Radiographic Features of Radiographic Features of Pericoronitis Pericoronitis Effects on adjacent structures Differential diagnoses Sclerotic border Enostoses and osteosclerosis In larger lesions, periosteal new bone Fibrous dysplasia formation may be evident Malignancies such as osteosarcoma and squamous cell carcinoma Pericoronitis Osteomyelitis Osteomyelitis Inflammation of the bone Bacteria and by-products stimulate an May spread to involve: inflammatory reaction in bone Marrow In young patients, the periosteum is Cortex Periosteum lifted by inflammatory exudates. New Cancellous portion bone is laid down. This is called Garre’s Osteomyelitis Caused by pyogenic organisms from abscessed teeth, trauma, or surgery Presence of sequestra is a hallmark of osteomyelitis. These can be seen in Source of infection can not always be identified both plain films and CT 12 Radiographic features of Osteomyelitis Osteomyelitis Acute and chronic forms exist Location Acute form demonstrates purulent The most common location of drainage osteomyelitis of the jaws is the Paresthesia of the lip may be present, posterior body of the mandible suggesting a malignancy Involvement of the maxilla is rare, perhaps due to its excellent vascularity Radiographic features of Radiographic features of Osteomyelitis Osteomyelitis Borders Internal architecture The borders of these lesions are ill- Initially, there is a slight decrease in the defined, gradually blending into the radiodensity of the bone, with the normal trabecular pattern trabeculae becoming less well defined There may be scattered areas of lucency in the area Later, areas of sclerotic bone are seen Sequestra are most apparent in the chronic
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