Histo Anatomy of PDL and Alveolar Bone

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Questions and Answers

What is the primary reason for alveolar bone resorption in patients without dental implants?

Absence of stimulation from natural teeth (correct)

Inadequate denture fit

Poor dietary choices

Lack of oral hygiene

Which of the following describes the relationship between the junctional epithelium (JE) and the gingival connective tissue attachment?

JE is apical to the gingival connective tissue attachment

Gingival connective tissue attachment is apical to the JE (correct)

JE is coronal to the gingival connective tissue attachment

Both have equal attachment widths

What structure provides attachment of the junctional epithelium to the tooth enamel?

External basal lamina

Fibroblast connections

Internal basal lamina and hemidesmosomes (correct)

Connective tissue fibers

During tooth eruption, how is the junctional epithelium formed?

Through fusion of the oral epithelium and the reduced enamel epithelium Signup and view all the answers

What unique feature distinguishes the junctional epithelium’s attachment apparatus?

It possesses a unique internal and external basal lamina Signup and view all the answers

What happens to the alveolar bone in the maxilla and mandible over time after complete tooth loss?

It undergoes gradual resorption Signup and view all the answers

What is the average width of the junctional epithelium attachment?

1mm Signup and view all the answers

Where is the sulcular epithelium located in relation to the junctional epithelium?

Coronal to the junctional epithelium Signup and view all the answers

What occurs in relation to tooth loss and alveolar bone maintenance?

Tooth loss leads to resorption of alveolar bone. Signup and view all the answers

Which histological feature distinguishes dense cortical bone from less dense trabecular bone?

Cortical bone exhibits tightly packed lamellae while trabecular bone shows a spongy structure. Signup and view all the answers

What sequence describes the development of alveolar bone relative to tooth and PDL development?

Alveolar bone develops simultaneously with tooth and PDL formation. Signup and view all the answers

What is a primary function of the collagen fibers present in the PDL?

They provide the PDL with viscoelastic properties. Signup and view all the answers

Which statement best describes the role of Meckel's cartilage in mandible development?

Meckel's cartilage serves as a template for early mandible formation but ossification occurs primarily in mesenchyme. Signup and view all the answers

What is the role of Epithelial Rest Cells of Malassez in the periodontal ligament?

They release EGF to stimulate osteoclasia for periodontal bone maintenance. Signup and view all the answers

Which group of PDL fibers is primarily responsible for absorbing occlusal forces?

Oblique fibers Signup and view all the answers

What is the primary connective tissue from which the periodontal ligament is derived?

Dental follicle fibroblasts Signup and view all the answers

Study Notes

Periodontal Ligament (PDL) and Alveolar Bone Histo Anatomy

PDL Development: Derived from dental follicle fibroblasts
PDL Fiber Groups:
- Oblique Fibers: Primarily absorb occlusal forces
- Other Fiber Groups: Alveolar crest, horizontal, interradicular, apical
Sharpey's Fibers:
- Found in alveolar bone and cementum
- Embedded ends of PDL fibers
- Provide strong attachment
Epithelial Rest Cells of Malassez:
- Found in the PDL near the cementum
- Release epithelial growth factor (EGF)
- Stimulate osteoclasia on the periodontal bone surface, maintaining the periodontal space
PDL Extracellular Matrix: Collagen fibers (Type I and III) contribute to viscoelastic properties
Bundle Bone: A specialized layer of alveolar bone that directly interfaces with the PDL.

Alveolar Bone Development:

Alveolar bone forms concurrently with tooth development
Alveolar bone grows with the root and adapts after tooth eruption

Alveolar Bone Histology:

Cortical Bone: Dense, outer layer
Trabecular Bone: Less dense, inner layer
Inner Periosteum: Lined with osteoblasts
Outer Periosteum: Contains neurovascular tissue and fibroblasts

Alveolar Bone After Tooth Loss:

Alveolar Bone Resorption: Occurs over time in edentulous patients due to lack of occlusal stimulation

Gingival Histoanatomy

Junctional Epithelium (JE) Formation: Fusion of oral epithelium (OE) and reduced enamel epithelium (REE) during tooth eruption
JE Attachment:
- Average width: 1 mm
- Attached to the enamel via internal basal lamina and hemidesmosomes
Gingival Connective Tissue Attachment:
- Average width: 1mm
- Located apical to the JE
Sulcular Epithelium:
- Located coronal to the JE
Gingival Epithelium Attachment: Attached to the underlying connective tissue via the external basal lamina and hemidesmosomes
JE Unique Feature:
- SSNK (stratified squamous non-keratinizing)
- Critical periodontal attachment apparatus
- Distinct internal and external basal lamina

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Description

Explore the intricate histo anatomy of the periodontal ligament (PDL) and alveolar bone. This quiz covers developmental aspects, fiber groups, and cellular components involved in maintaining periodontal health. Test your knowledge on the relationships between PDL and alveolar bone structures.