What does loss of lamina dura indicate?
It is usually considered that the loss of the lamina dura is pathognomonic of hyperparathyroidism although some degree of loss may be apparent in osteomalacia and in Paget’s disease.
What is the clinical significance of lamina dura?
An intact lamina dura is seen as a sign of healthy periodontium. Lamina dura, along with the periodontal ligament, plays an important role in bone remodeling and thus in orthodontic tooth movement. Under the lamina dura is the less bright cancellous bone.
What causes thickening of lamina dura?
Bone changes may take the appearance of thickening of the lamina dura, widening of the periodontal ligament, focal sclerosis, cortical erosion and radiolucent areas (Table. 1), but these are nonspecific and can occur because of ‘everyday’ dental disease and even normal anatomical variation in bone pattern.
What is the lamina dura of a tooth?
The lamina dura is the hard bony lining of the alveolus (Fig. 1), or socket, of a tooth, and to- gether with the periodontal ligament and the cementum which coats the tooth root it forms the attachment apparatus of the tooth.
Which term is also used to refer to the lamina dura?
: the thin hard layer of bone that lines the socket of a tooth and that appears as a dense white line in radiography. — called also cribriform plate.
What bone forms most of the lamina dura?
Alveolar bone proper
Alveolar bone proper appears on a radiograph as a thick radiopaque line adjacent to the alveolar socket, termed the lamina dura. The alveolar bone proper provides the attachment site for Sharpey fibers from the PDL.
Why is alveolar bone called lamina dura?
The alveolar process includes a region of compact bone that is adjacent to the periodontal ligament (PDL). This is called the lamina dura when it is viewed on radiographs. The alveolar bone proper is also called the bundle bone because of the Sharpey fibers. A portion of the fibers of the PDL are inserted here.
What is the lamina dura made up of?
After eruption, the lamina dura is observed as a thin radiopaque layer of dense bone around sound teeth in a normal dental arch, and is continuous with the shadow of the cortical bone at the alveolar crest.
How does alveolar bone develop?
The alveolar bone develops during tooth eruption and undergoes atrophy with tooth loss. In addition to the three layers found in all bones, namely periosteum, dense compact bone and cancellous bone, there is a fourth layer called the cribriform plate, which lines the alveolar sockets.
Where is attached gingiva?
The gingival sulcus, or crevice, is therefore created between tooth and mucosa; its depth varies from 0.1 to 0.3 cm. The attached gingiva extends from the free gingival groove to the beginning of the alveolar crest and is continuous with the alveolar mucosa.
What causes discontinuity in the lamina dura?
Discontinuity in lamina dura is indicative of abnormality, usually suggestive of disease. Most common causes for the absence of lamina dura are periapical inflammatory lesions and periodontal disease.
Which is better CBCT or Iopa for lamina dura?
Lamina dura is demarcated around the alveolar socket. CBCT is considered better than IOPA/ Periapical radiographs and Panoramic radiographs for detection of lamina dura and PDL space. (1) CBCT can detect bone defects of the cancellous bone and cortical bone separately.
How is lamina dura demarcated in CBCT image?
The lamina dura can be demarcated around a recent extraction socket. Coronal image showing socket with 12 and sagittal image showing socket with 38. Lamina dura is demarcated around the alveolar socket. CBCT is considered better than IOPA/ Periapical radiographs and Panoramic radiographs for detection of lamina dura and PDL space.
Where does the name lamina dura come from?
The name lamina dura is applied to the thin layer of dense, cortical bone which lines the root socket of the alveolar process. It is visualized as a thin opacity since it results due to a layer of dense bone.