What is the socalled intermediate plexus of the periodontal ligament?
Intermediate between the bone and the cementum in actively erupting teeth (or orthodontic movements) the fibers of the periodontal ligament form a plexus of intermingling fibers (C). This plexus is called the intermediate plexus.
What are the Fibres of periodontal ligament?
The PDL consists of principal fibers, loose connective tissue, blast and clast cells, oxytalan fibers and Cell Rest of Malassez. The primary principal fiber group is the alveolodental ligament, which consists of five different fiber subgroups.
What is Sharpey’s fibers?
Sharpey’s fibres (bone fibres, or perforating fibres) are a matrix of connective tissue consisting of bundles of strong predominantly type I collagen fibres connecting periosteum to bone. Each fibre is accompanied by an arteriole and one or more nerve fibres. Scottish anatomist William Sharpey described them in 1846.
What is the periodontal ligament composed of?
collagen types
The periodontal ligament is made of various collagen types and has a neurovascular component that is extremely narrow yet very complex. Although called a ligament, your PDL is not like the ligaments that surround an articulating joint. However, this special ligament plays a crucial function in your overall oral health.
What is modified Endosteum?
7. These cells covering the the periodontal surface of the alveolar bone constitute a modified endosteum and not a periosteum . A cellular layer but not an fibrous layer is present on the periodontal surface of the alveolar bone .
What is periodontal ligament in dentistry?
The periodontal ligament, commonly known as the PDL, is a soft connective tissue between the inner wall of the alveolar socket and the roots of the teeth. It consists of collagen bands (mostly type I collagen) connecting the cementum of teeth to the gingivae and alveolar bone.
What is the name for the periodontal ligament fibers that are embedded in cementum and bone?
The periodontal ligament, which is often referred to as the PDL, is a group of specialized connective tissue fibers which attach the tooth to the alveolar bone. On one side, it inserts into the root cementum and it inserts into the alveolar bone on the other.
What is dehiscence in perio?
18-8) A dehiscence is loss of alveolar bone on the facial (rarely lingual) aspect of a tooth that leaves a characteristic oval, root-exposed defect from the cementoenamel junction apically. The defect may be one or two millimeters long or extend the full length of the root.
What is the periodontal ligament?
DEFINITION • According to Carranza & Bernard “The periodontal ligament is the connective tissue that surrounds the root & connects it to the bone. It is continous with the connective tissue of the gingiva & communicates with the marrow spaces through vascular channels in the bone.”
What are principal PDL fibers 36/71?
PRINCIPAL PDL FIBERS 36/71 • The principle fibres of Periodontal ligament (Holmstrup 1996). • These are collagenous and follow a wavy pattern when viewed in longitudinal section . • They are thought to contribute to the regulation of mineralization and to tissue cohesion at sites of increased biomechanical strain.
What is the meaning of periodontium?
INTRODUCTION • The term periodontium arises from greek words “peri” meaning around and “odont” meaning tooth. Tissues that invest and support the teeth are collectively termed PERIODONTIUM. 3/71 Periodontium Gingiva Periodontal Ligament Alveolar Bone Cementum 4.
How to maintain unmineralized PDL region in bone?
Balance b/w activities of bone sialoproteins and osteopontin – maintains unmineralized PDL region.