Radiology. & supporting structures. Lec. 14 Common diseases of teeth Dr. Areej
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1 Radiology Lec. 14 Common diseases of teeth Dr. Areej & supporting structures A radiograph is only one part of the diagnostic process. Usually one does NOT make a diagnosis solely from a radiograph. A diagnosis is made by the clinician once all the diagnostic information has been collected and analyzed collectively. An interpretation or a differential diagnosis is made from the radiograph. One examines a radiograph and NOT an X-ray. Bear in mind that an X-ray cannot be seen. X-ray is a photon / beam of energy. Dental caries Occlusal, buccal, and lingual carious lesions are reasonably easy to detect clinically. Interproximal caries and caries associated with existing restorations are much more difficult to detect with only a clinical examination. it is necessary to expose patients periodically through radiography to monitor dental caries. The carious process causes tooth demineralization, the demineralized area allows greater infiltration of x-ray and appear darker than the unaffected portion and can be detected on radiographs. An early carious lesion may not have yet caused sufficient demineralization to be detected radiographically. Moderately advanced caries on any tooth surface can be demonstrated on a properly angulated, exposed & processed intra-oral film. Factors affecting the interpretation of dental caries: 1. Cervical burnout: Radiolucent band around the neck of the teeth ( area not cover by enamel or alveolar bone). happened due to less x- ray absorption than areas below and above. It can be reduced by reducing kvp 2. Peripheral burnout: It could be reduced by decreasing exposure time or kvp. 3. Ratio of enamel to caries which X-ray photon must penetrate. 4. Errors in vertical angulations: Increased & decreased. 5. Errors in horizontal angulations: which cause interproximal overlapping. 6. Lesions simulate dental caries: example developmental defects.
2 Interproximal caries The intra oral radiographic film, notably the bitewing or periapical film made with the paralleling technique is extremely useful in detecting interproximal carious lesions. The shape of the early carious lesion in enamel is classically a triangle with its broad base at tooth surface, spreading along enamel rods toward the dentine. Sometimes the carious lesion appear as notch, dot, band or thin radiolucent line. After reaching DEJ, the carious lesion spread along the dentino-enamel junction forming the base of the second triangle with the apex directed toward the pulp and spread along the dentinal tubules forming more irregular shape. An incipient interproximal lesion extends less than halfway through the thickness of enamel. The term incipient means beginning to exist or appear. An incipient lesion is seen in enamel only. A moderate interproximal lesion extends greater than halfway through the thickness of enamel, but does not involve the DEJ. A moderate lesion is seen in enamel only An advanced interproximal lesion extends to the DEJ or through the DEJ and into the dentin, but does not extend through the dentin greater than half the distance toward the pulp. An advanced lesion affects both enamel and dentin. A severe interproximal lesion extends through enamel, dentin and greater than half the distance towards the pulp. A severe lesion involves both the enamel and dentin and may clinically appear as a cavitation (or hole) in the tooth. Occlusal caries: The first radiographic sign is a thin radiolucent line between enamel and dentin. occasionally occlusal caries is confused with buccal or lingual caries and differentiated clinically. Occlusal caries originates in pits and fissures,follows the enamel rods as in interproximal caries, the shape is triangular with the base is toward the DEJ and the apex is toward the occlusal surface of the tooth.
3 Incipient occlusal caries cannot be seen on a dental radiograph and must be detected clinically. Moderate occlusal caries extends into dentin and is seen as a very thin radiolucent line. The radiolucency is located under the enamel of the occlusal surface of the tooth. Little if any radiographic change is noted in the enamel. Severe occlusal caries extends into dentin and is seen as a large radiolucency. Severe occlusal caries is apparent radiographically and clinically,appears as a cavitation (or hole) in a tooth. Buccal and lingual caries: It occur in the enamel pits and fissures tends to follow the lines of the enamel rods. small lesion appear round; as they enlarge, they become elliptical or semi lunar with sharp well defined borders. It is difficult to differential between buccal and lingual caries, also it may be confused with pulp exposure even the lesion may be relatively superficial. Cemental caries: Root caries or cemental caries involves both cementum and dentin associated with gingival recession. usually described as ill-defined, saucer-like radiolucent area. Secondary or recurrent caries : Recurrent caries occurring immediately next to a restoration. It may result from poor adaptation of a restoration, which allows for marginal leakage, or from inadequate extension of a restoration. In addition, caries may remain if the original lesion is not completely evacuated, which later may appear as residual or recurrent caries. The radiographic appearance of recurrent caries depends on the amount of decalcification present and whether a restoration is obscuring the lesion or not. Developmental pits Developmental pits particularly isolated hypoplastic areas, can simulate caries radiographically. In the case of a hypoplastic pit the enamel surface tends to curve inward into the defect giving false interpretation of carious lesion.
4 Pulp exposure Radiographic evidence suggesting pulp exposure should not be used as the only definitive criteria for either tooth removal or endodontic therapy. It is possible through angulations changes to create on appearance radiographically that simulate pulpal exposure. Periapical inflammatory lesions Periapical inflammatory lesions have been called periapical cyst, periapical abscess, and periapical granuloma. Radiolucent presentations have been called rarefying osteitis, whereas radiopaque presentations have been called sclerosing osteitis, condensing osteitis, and focal sclerosing osteitis. 1. Common pathologic conditions: granuloma, cyst, abscess, l sl stage of cementoblastoma. 2. Less common pathologic conditions: fibro-osseous lesions, neoplastic changes, and various infections. Radiographic signs: the apical lesion will show an interrupted lamina dura. The periphery blend into surrounding bone; definite demarcation may exist between the lesion and bone or the lesion may exhibit a distinct bone lamina encircling the radiolucency, the shape is basically spherical with irregular or smooth outline periphery. * keep in mind that you must think firstly about normal anatomical landmarks superimposed above the periapical area like mental foramen, incisive foramen & maxillary sinus. Interpretation of periapical radiolucency: 1. Superimposition of radiolucent normal anatomical structure like mental foramen & maxillary sinus, & inferior dental canal. 2. Incomplete root formation (with children) 3. Periapical cyst, granuloma, or abscess. 4. First stage of cementoblastoma Periodontal disease Periodontal diseases including gingival recession and alveolar bone loss, are more common in older adults and it's responsible for a substantial portion of all teeth lost. radiographic examinations play an important role in the evaluation of patients with periodontal disease.
5 Radiographs are especially helpful in the evaluation of the following points: Amount of bone present Condition of the alveolar crests Bone loss in the furcation areas Width of the periodontal ligament space Local initiating factors that cause or intensify periodontal disease a) Calculus b) Poorly contoured or overextended restorations c) Root length and morphology and the crown-to-root ratio Alveolar bone loss Periodontal bone loss may be localized (restricted to one or a few areas) or Generalized periodontitis (when periodontal bone loss is evenly distributed throughout the mouth). Under normal circumstances the alveolar bone level is located 1 to 1.5mm from CEJ so a measurement made from the crest of remaining bone to the CEJ minus approximately 1mm gives an indication of bone loss. Direction of bone loss Intercerstal bone should be parallel with a line drawn from the CEJ of one tooth to that of the contacting tooth. 1.Horizontal bone loss: when loss occur on a plane that is parallel with a line drown. 2.Vertical bone loss: when there is greater bone loss in one tooth side than on the adjacent tooth, so the bone level is not parallel with a line joining the cementoenamel junctions. Horizontal bone loss vertical (angular) bone loss
6 Bone changes associated with apical alteration 1. Condensing osteitis: bone sclerosis as a result of stress, trauma or infection. It characterized by reduction of trabecular spaces size. 2. Ankylosis: bone and tooth roots occasionally become fused. Periodontal space thickening Widening of PD space is either: 1. Pathologic: as in tooth extrusion, root resorption, resorption of lamina dura, initial symptoms of osteomylitis or with trauma. 2. Non pathologic: as in terminal stage of root formation. Detection of local irritating factors These include calculus deposits, over hanging restorations, faulty restorative margins and carious lesions which represent a causative factors for periodontal disease. Types of Periodontal disease 1. Incipient periodontal disease a. Triangulation: widening of periodontal space at the crest of interproximal bone. b. Crestal irregularities: slightly more opaque alveolar crest with itched appearance (irregular) c. Alveolar bone changes: bone sclerosis between the lamina dura of two adjacent teeth. 2. Advanced periodontal disease It includes all stages that follow incipient periodontal changes in addition to periodontal pocket exists between soft tissue and tooth structure. Root end changes A. Hypercementosis: clubbing of root (radiopacity related to the root surface ) B. Root resorption: have different classifications Can be classified according to etiology into: 1. Physiologic root resorption: resorption of the deciduous teeth normally precedes their exfoliation. 2. Idiopathic root resorption: resorption of root surfaces occur from unknown cause 3. Pathologic root resorption: it's usually caused by pressure, infection neoplasm or trauma.
7 According to site of resorption, classified into: 1. Internal 2. External According to root periphery, classified into: 1. Smooth root resorption (smooth root periphery) 2. Rough root resorption (roughened root periphery). Pulp calcifications It include pulp stones, secondary dentin, dentinal bridges and pulpal obliteration 1. Pulp stone:round or oval opacities within the pulp. 2. Secondary dentin: reduces the size of the chamber. It appears to be a normal aging phenomenon as well as a defense mechanism. 3. Dentinal bridges: develop between Normal pulp tissue and large carious lesion 4. Pulpal obliteration: associated with aging and degenerative pulp changes. Tooth fractures Fracture-line appear as discontinuity in the outline of the tooth (radiolucent line). It must be remembered that the radiograph can have an appearance that simulates a fracture, or fractured segments can be superimposed in a manner that hides the fracture, so multiple views of the questionable area ordinarily resolve such difficulties. Occult Disease refers to disease presenting no clinical signs or symptoms and can be detected by x-ray. Occult diseases include a combination of dental and intraosseous findings. Dental findings may include incipient carious lesions, resorbed or dilacerated roots, and hypercementosis. Intraosseous findings include osteosclerosis, unerupted teeth, periradicular disease, and a wide variety of cysts, benign and malignant tumors. Small carious lesions, resorption of root structure, cysts, and tumors may go unnoticed until signs and symptoms develop.
8 Principles of Radiographical interpretation Analysis of abnormal findings is a step by step process to reach the diagnosis. It consist of the following steps: 1. Localized the abnormality: Localized (unilateral lesion) or Generalized (affecting all the maxillofacial region) 2. Assess the shape and periphery: Shape (may be circular - fluid filled similar to inflated balloon as in cyst lesion, or scalloped shape, or irregular). while Periphery or borders ( may be well defined border as punched out, sclerotic and corticated borders, or ill-defined border) 3. Analyze internal structure: radiolucent, radiopaque or mixed lesion. 4. Analyze the effect of lesion on the surrounding structures: tooth displacement or floating, root resorption, widening of PD space, osteoblastic reaction, bone expansion, or displacement of inferior dental canal. 5. Formulate radiograpical interpretation.
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