The cell from which of the following tissues should reach the healing area first for the new attachment to occur

The cell from which of the following tissues should reach the healing area first for the new attachment to occur:
a- Gingival epithelium.
b- Gingival C.T.
c- Periodontal ligament (PL) ***
d- Alveolar bone.
Guided tissue regeneration "GTR":
is based on the assumption that only the periodontal ligament cells have the potential for regeneration of the attachment apparatus (new attachment).

The dental alveolar ligament is a fibrous connective tissue between the somatic bone in particular and the slurry covering the root surface. This tissue surrounds the root of the tooth and connects it to the skeletal tissue of the jaws and gum tissue, covered by an epithelial skin and acts as a permanent protective device for the teeth during its work.
The dental alveolar system is composed of four parts of the connective tissue:
Two Divisions.
Two parts are mixed with mineral salts.
The mineralized sections are:
- Mortar.
- Alveolar protrusions.
- Fiber sections are:
Sunni alveolar ligament and gum fibers.

Periodontal ligament:
It is a fibrous connective tissue that contains large amounts of cells in addition to the blood vessels and nerves that are located between the alveolar bone proper and the slurry of the tooth, that is, the supporting ligament is located in the periodontal around the teeth and is composed of cells and material between Cellular. The latter is composed of collagen fibers and ground substitutes, which in turn are made up of proteins and sugars.
Age ligaments develop from the tissue of the dental follicle surrounding the tooth bud. The fibers of the ligament, the alveolar bone and the slurry are due to advanced cells of the dental follicle.
The thickness of the supporting ligament ranges between 0.15 mm - 0.38 mm. This thickness decreases slightly with age but is as low as possible in the middle area of ​​the root.
The ligament consists of bundles of collagen fibers that attach the alveolar bone proper to the alveolar bone proper.
Interstitial space also contains blood vessels and nerve trunks, which connect with the nerves and blood vessels at the top of the tooth root and alveolar bone.
This tissue is characterized by a high cellular density composed of fibroblast fibroblasts, vascular cells, nerve cells, bone cells and malatine cells.
The primary function of the supporting ligament is to support the teeth within the alveolar cavity. In addition, the ligature transfers the neural input into the masticatory apparatus and has a primary feeding function to maintain ligament health, which has clinical considerations such as maintaining the teeth.
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