Periodontal Anatomy - part 2 Flashcards
What two areas does the attached gingiva attach?
- periosteum
2. tooth - cementum and enamel via JE
During tooth eruption, all cells of the ___ ___ epithelium are replaced by junctional epithelium.
reduced enamel epithelium
T/F. After tooth eruption, the cells of the oral epithelium possess the ability to differentiate into cells of junctional epithelium.
True. If the free gingiva is excised after tooth eruptions, a new JE will develop from the oral epithelium.
Where is the JE widest? thinnest?
widest in its coronal portion (15-20 cells)
thinnest towards CEJ (3-4 cells)
The size of the JE cells is ___ (smaller/larger) than OE. The intracellular space of JE is ___ (thinner/wider) than OE.
larger; wider
Who has more desmosomes, JE or OE?
OE
Does the JE have the potential to keratinize?
yes, this is a protective mechanism
T/F. JE is in contact with the tooth. It does not physically attach to it.
False, JE IS physically attacted to the tooth
In a child, the JE sit ___ (low/high) on the tooth and there is a ___ (smaller/larger) sulci. The probe depths are generally ___ (consistent/inconsistent).
high; smaller; inconsistent
In an adult, where does the JE sit?
coronal (1mm) to CEJ or at the CEJ
In a diseased patient, the JE is not loss, but migrates downward. This is known as ___ ___.
attachment loss.
When does periodontitis occur?
when the JE migrates apically down the root surface. A viable JE is necessary for pocket formation.
A HIV postitive patient presents with loss of JE and exposed bone. Because the JE cells have died, no pocketing can be performed. This patient is at risk for developing osteomyelitis of the bone. What condition does he have?
Necrotizing ulcerative periodontitis (NUP)
Your probe contacts the bone at 3mm below the CEJ, but there is no recession of the gingiva, which is located 3mm above the CEJ. How would you describe the attachment loss, recession and probe depth?
attachment loss - 3mm
recession - negative because gingiva coronal to CEJ
probe depth - 6mm
The margin of the gingiva is at the CEJ and you measure a probe depth of 6mm. What does this tell you about attachment loss?
it is also 6mm. It is recorded from the CEJ to the level of bone loss.
Your probe measures bone loss at 9mm below the CEJ. You notice the gingiva is apical to the CEJ at 3mm. Describe the attachment loss, recession and probe depth?
attachment loss - 9mm
recession - true because gingiva is apical to the CEJ
probe depth - 6mm
What is another name for the connective tissue of the gingiva?
lamina propria
Of the 6 cells found in the lamina propria, which cell synthesizes CT matrix and fibers?
fibroblast
Which lamina propria cell produces vasoactive substances which can affect the function of the microvascular system and control the flow of blood through the tissue?
mast cells
In addition to fibroblast and mast cells, what other cells are found in the lamina propria?
macrophages, neutrophillic granulocytes, lymphocytes, plasma cells
Which cells produce CT collagen fibers?
fibroblast, cementoblasts, osteoblasts
What predominates in the gingival tissue?
collagen fibers
Which type of fiber is numerous in the tissue adjacent to the basement membrane and blood vessels?
reticulin fibers
___ fibers are scarce in the gingiva but numerous in the ___ ___. They run ___ (parallel/perpendicular) to the long axis of the tooth.
oxytalan; periodontal ligament; parallel
