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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 meaning 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.
What is the lamina dura in dentistry?
The lamina dura surrounds the tooth during development with an egg-shell like effect. 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.
What is loss of lamina dura?
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.
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 clinical significance of lamina dura?
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 do you mean lamina?
noun, plural lam·i·nae [lam-uh-nee], lam·i·nas. a thin plate, scale, or layer. a layer or coat lying over another, as the plates of minerals or bones. Botany. the blade or expanded portion of a leaf.
In which condition lamina dura is congenitally absent?
The thickness and density of Lamina Dura is a product of occlusal stress from tooth force dissociation. The absence or diminution of lamina dura is diagnostic of many local & systemic conditions like hyperparathyroidism, renal osteodystrophy, etc.
What causes thickened 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.
Can hyperparathyroidism cause tooth loss?
People with varying types of hyperparathyroidism and hypercalcemia may experience: Soft tissue calcifications. Tooth sensitivity when biting and chewing. Malocclusion.
How does the lamina dura appear radiographically?
Radiographically, this either appears as widening of the apical periodontal ligament space or as no change at all (Figure 6-4, A). Bone and root resorption occur at this stage but the changes may be too small to appear radiographically; lack of a radiographic lesion does not rule out early endodontic disease.
What is bud stage?
Definition. (dentistry) The first stage in a developing tooth where a tooth bud forms from the dental lamina. Supplement. The stage is also referred to as the initiation as the epithelial cells start to proliferate into the ectomesenchyme of the jaw.
What is an ideal radiograph?
DEFINITION • An Ideal Radiograph is one that provides a great deal of information, the image exhibits proper density and contrast, have sharp outlines and are of the same shape and size as the object being radiographed.
What is the dental lamina?
: a linear zone of epithelial cells of the covering of each embryonic jaw that grows down into the developing gums and gives rise to the enamel organs of the teeth. — called also dental ridge.
What is slob technique?
An intraoral technique for object localization is the tube-shift method. It goes by different terms, including Clark’s rule, the buccal object rule and the same-lingual, opposite-buccal (SLOB) rule. The principle of this method requires exposing two different angulated intraoral x-ray images of one area.
What is a radicular cyst?
Introduction. A radicular cyst is generally defined as a cyst arising from epithelial residues (cell rests of Malassez) in the periodontal ligament as a consequence of inflammation, usually following the death of the dental pulp.
What happens if hyperparathyroidism goes untreated?
The effects of hyperparathyroidism can result in other health concerns, if left untreated. In addition to kidney stones and osteoporosis, older patients may physical symptoms including depression, mood changes, fatigue, muscle, and bone aches and pains, or even cardiac dysrhythmias.
Does hyperparathyroidism cause belly fat?
Parathyroid disease and hyperparathyroidism are associated with weight gain. The worries about gaining weight after parathyroid surgery are understandable but unfounded. It is a myth that parathyroid surgery and removing a parathyroid tumor causes you to gain weight.
Is itching a symptom of hyperparathyroidism?
Hyperparathyroidism can cause a range of problems, such as kidney stones, pancreatitis, bone mineral loss, decreased kidney function, duodenal ulcer, itching, and muscle weakness.
What is the fate of dental lamina?
On completion of the dentition, the dental lamina is usually destroyed and reabsorbed, but when remnants fail to resorb, it can continue to proliferate abnormally. This abnormal proliferation can form the extra tooth bud leading to supernumerary teeth.
What happens in the apposition stage?
The next stage of odontogenesis is the apposition stage, where due to induction between the ectodermal tissue of the enamel organ and mesenchymal tissue of the dental papilla and dental sac will produce of enamel, dentin, and cementum by cellular by-products [1].
What are the stages of tooth eruption?
Stage 2: (6 months) The first teeth to erupt are the upper and lower front teeth, the incisors. Stage 3: (10-14 months) Primary Molars erupt. Stage 4: (16-22 months) Canine teeth (between incisors and molars on top and bottom) will erupt. Stage 5: (25-33 months) Large molars erupt.
What is the role of successional lamina?
The successional dental lamina (SDL) plays an essential role in the development of replacement teeth in diphyodont and polyphyodont animals.
What is the function of vestibular lamina?
The vestibular lamina is responsible for the formation of the vestibule (the space bordered by the junction of the gingiva and the tissue of the inner cheek) and arises from a group of cells called the primary epithelial band.
What are Bohn’s nodules?
Bohn’s nodules are also keratin-filled cysts, found at the junction of hard and soft palate and along buccal and lingual parts of the alveolar ridges away from the midline, and are remnants of salivary glands.
