Please enable JavaScript.
Coggle requires JavaScript to display documents.
Ch. 21 Radiographic Analysis of the Periodontium (radiographic signs…
Ch. 21 Radiographic Analysis of the Periodontium
radiographic features
radiopaque: structures absorb or resist penetration by xrays
radiolucent: structures are easily penetrated by xrays
cortical bone: outer surface of bone composed of layers of bone closely packed together
alveolar crest: normal level is approximately 2mm apical to the CEJ
lamina dura: alveolar bone proper is the thin layer of dense bone that lines a normal tooth socket. Referred to as lamina dura in radiographic images
periodontal ligament space: space between the root and the lamina dura of the socket filled with periodontal ligament tissue
Use of Radiographic Images during periodontal evaluation
long-cone paralleling technique for PA's provide radiographs that are more anatomically accurate
long-cone paralleling technique for bitewings: used to evaluate crestal bone height
horizontal bone loss: loss of bone that is parallel to an imaginary line drawn between the CEJs of adjacent teeth
vertical bone loss: occurs when there is greater bone destruction on the interproximal aspect of one tooth than on the adjacent tooth so that the bone meets the tooth at an acute angle
Limitations of dental radiographs
radiographs are two-dimensional images of three-dimensional structures
information obtained from a dental radiograph is primarily limited to information about calcified structures
provide only limited information about certain critical aspects such as pockets
radiographic signs associated with periodontal disease
bone defects: radiolucent due to bone loss and therefore visible on radiographic images, although three-dimensional structure may be hard to determine
furcation alveolar bone loss: loss of bone in furcation area detectable by triangular radiolucency especially on molars
vertical bone loss: seen as more bone loss on the interproximal aspect of one tooth than on the adjacent tooth; bone level is at an angle to a line joining the CEJs
unfavorable crown to root ratio: seen as greater portion of tooth coronal to alveolar crest compared to portion of tooth structure apical to alveolar crest
horizontal bone loss: can be measured from a plane that is parallel to a tooth to tooth line drawn from the CEJs of adjacent teeth
peri-implant bone loss: bone loss around a dental implant
early bone changes: break or fuzziness at the crest of the interdental alvolar bone; widening of the periodontal ligament space at crestal margin