Is lamina dura cortical bone?
Lamina dura (LD) is a radiographic landmark viewed largely on periapical radiographs (PR). The terminology LD (or alveolus) is applied to the thin layer of dense cortical bone, which lines the roots of sound teeth.
What is the lamina dura in bone?
Lamina dura is compact bone that lies adjacent to the periodontal ligament, in the tooth socket. The lamina dura surrounds the tooth socket and provides the attachment surface with which the Sharpey’s fibers of the periodontal ligament perforate.
What is cortical plate of bone?
The cortical bone, also known as cortical plates, consist of plates of compact bone found on the facial and lingual surfaces of the alveolar bone. These cortical plates are typically about 1.5-3 mm thick compared to the posterior teeth. However, the thickness varies drastically around the anterior teeth.
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.
Is lamina dura cribriform plate?
The lamina dura is produced by the periodontal ligament; it forms the hard lining of the tooth socket, and is a cribriform plate of bundle bone in which fibers of the periodontal ligament are em- bedded.
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.
Should the periodontal ligament be removed?
Periodontal Ligament When you bite down and chew, the PDL protects the tooth from shattering by compressing a fraction of a millimeter like a spring. It is standard of care for a traditional oral surgeon to assume that the periodontal ligament adheres to the tooth and is therefore always removed during an extraction.
What does lamina dura mean?
Medical Definition of 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.
Why is alveolar bone called cribriform plate?
Although the alveolar process is composed of compact bone, it may be called the cribriform plate because it contains numerous holes where Volkmann’s canals pass from the alveolar bone into the PDL. The alveolar bone proper is also called bundle bone because Sharpey’s fibres, part of the PDL, are inserted there.
What do you need to know about lamina dura?
Introduction Lamina dura (LD) is a radiographic landmark viewed largely on periapical radiographs (PR). The terminology LD (or alveolus) is applied to the thin layer of dense cortical bone, which lines the roots of sound teeth. Presence of LD is an indication of the health of the teeth.
What is the hypodensity on the lamina dura?
The thin hypodensity/ radiolucency present along the tooth side denotes the periodontal ligament space and cancellous bone lies on the opposite side of the lamina dura. The lamina dura can be demarcated around a recent extraction socket. Coronal image showing socket with 12 and sagittal image showing socket with 38.
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.
Can a lamina dura be a radiographic artifact?
The radiographic lamina dura does not appear to be an artifact, and could not be readily created in specimens. Lamina dura measurements did not significantly correlate ( P <0.05) with corresponding alveolar bone pr oper. There was a weak correlation (P<0.05) for radiographic and hist ological PDL images.