38 Questions
What is the function of the marginal gingiva?
To form the soft tissue wall of the gingival sulcus
What is the gingival sulcus?
A shallow crevice or space around the tooth neck
What is the width of the marginal gingiva?
About 1 mm
What is the attached gingiva?
A firm, resilient part of the gingiva
What determines the shape of the interdental gingiva?
Both of the above
What is the histological composition of the gingiva?
Stratified Squamous Epithelium (SSE) and connective tissue
What is the normal depth of the gingival sulcus?
2-3 mm
What happens to the width of the attached gingiva with age?
It increases
What is the structureless layer between the epithelium and lamina propria?
Basement membrane
What is the function of the basal lamina?
To act as a barrier to particulate matter
What type of collagen is found in the lamina densa?
Type IV collagen
What is the thickness of the oral epithelium?
0.2-0.3 mm
What is characteristic of the sulcular epithelium?
It is non-keratinized and lacks rete pegs
What is the thickness of the junctional epithelium?
3-4 layers
What is expressed in the junctional epithelium?
K 19
What is the result of the irregularity of the basement membrane?
All of the above
What is the normal color of the gingiva in adults?
Coral pink
What is the shape of the gingival margin in adults?
Knife edge
What is the consistency of the gingiva in adults?
Firm and resilient
What is the surface texture of the gingiva in adults?
Stippled
What is the normal depth of the gingival sulcus in newly erupted teeth?
2-3 mm
At what age is stippling typically present in the gingiva?
By age 6
What percentage of connective tissue is formed by collagen fibers?
60%
What is the main function of gingival fibers?
To brace the marginal gingiva firmly against the tooth
What is the main component of the ground substance in connective tissue?
Proteoglycans
What type of fibers provide tensile strength to the lamina propria?
Collagen fibers
What is the origin of the dentogingival group of gingival fibers?
Cementum
What is the main source of blood supply to the gingiva?
All of the above
What is the main cell type responsible for forming collagen and elastic fibers in connective tissue?
Fibroblast
What is the main function of the reticular layer of connective tissue?
To provide a framework for tissue growth
What is the main cell type in the oral epithelium?
Keratinocyte
Where does the proliferation of keratinocytes most frequently occur?
Basal layer
Which type of cell found in the basal layer functions as tactile receptors?
Merkel cells
Which process involves the progressive flattening of the cell and the disappearance of the nucleus?
Keratinization
Which layers are Langerhans cells located in?
Suprabasal layers
What is the turnover time for the gingiva in experimental animals?
10 to 12 days
What is the primary function of gingival epithelium?
Provide a physical barrier to infection
Which cells synthesize melanin?
Melanocytes
Learn about the normal periodontium, gingiva, and its anatomical divisions, including marginal, attached, and interdental areas. Understand the gingival sulcus and its dimensions.
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