Why does the PDL space widen?
PDL widening occurs in trauma from occlusion, but in association with angular bone defects and mobility of teeth. However, in scleroderma, involved teeth are often not mobile and their gingival attachments are usually intact.
What is periodontal ligament space?
Periodontal ligaments are structures holding teeth in their sockets. They are seen as a thin radiolucent space between the surface of the tooth root and the lamina dura, the lining of the tooth socket. The lamina dura serves as a periodontal ligament attachment site.
What is the normal mobility of teeth?
Normal, physiologic tooth mobility of about 0.25 mm is present in health. This is because the tooth is not fused to the bones of the jaws, but is connected to the sockets by the periodontal ligament. This slight mobility is to accommodate forces on the teeth during chewing without damaging them.
Where is the narrowest width of the periodontal ligament space?
The width of PDL space is about 0.25mm in normal functions. It is widest at the cervical and apical portions of the root and narrowest at the middle.
When is lamina dura lost?
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.
How is PDL formed?
PDL cells are one of the many cells derived from the dental follicle and this occurs after crown formation is completed and when the roots start developing. These cells will remodel the dental follicle to form the PDL. Formation of PDL will start at the cementoenamel junction and proceeds in an apical direction.
What is grade 2 mobility tooth?
Grade 2 is tooth mobility greater than 2 mm, without vertical movement of tooth. This grade requires a more extensive procedure, other than the one mentioned for Grade 1. Splinting of teeth to adjacent healthy and normal teeth may be effective in this case.
What are PDL fibers?
The periodontal ligament, which is often abbreviated as the PDL, is a group of specialized connective tissue fibers that attach the tooth to the alveolar bone. The PDL inserts into root cementum on one side and onto alveolar bone on the other.
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.
