Anatomy

Question 1

Label the oral epithelium

Answer 1

Oral sulcular epithelium makes up the pocket.

Junctional epithelium attaches to the tooth surface.

Question 2

Describe epithelial changes of an erupting tooth.

Answer 2

A. Tooth has reduced dental epithelium (RE) on the outside surface of the enamel. Inside this is the epithelial attachment lamina (EAL).

B. As the tooth erupts, it comes in contact with the oral epithelium (OE) and you get formation of the JE.

C. JE replaces the reduced dental epithelium (RE)

4. JE lines side of tooth upon eruption.

Question 3

Label the supracrestal gingival fibers

Answer 3

CF: circumferential fibers
TF: transcrestal fibers
DGF: dental gingival

Question 4

Label the dentoalveolar fibers

Answer 4

ACF: alveolar crest fibers
HF: horizontal fibers
OF: oblique fiber
AF: apical fibers
RC: root cementum
ABF: alveolar bone proper

Question 5

Explain the development of the periodontal ligament fibers?

Answer 5

A) the first collagen fibers attach from the collagen fiber bundles of the periodontium.

B) first true fibers of the PDL develop in conjunction with the eruption of the tooth.

C) alternating fibers in orientation.

D) HF – horizontal fibres, OF – oblique fibres, DPF – denoperiosteal fibres, DGF – dentogingival fibres, APF – apical fibre group.

Question 6

What are Sharpey’s fibers?

Answer 6

Principal collagen fibers of the PDL which are embedded in cementum or alveolar bone.

Question 7

What are the 2 types of cementum and where are they found?

Answer 7

Acellular Cementum: coronal and middle portions of the tooth and contains mainly bundles of sharpey’s fibers.

Cellular Cementum: apical third of teeth and furcations.

Question 8

Blood supply lower dentition?

Answer 8

Inferior Alveolar Artery > Dental Artery > Interceptal artery > Rami Perforantes (terminal)

Question 9

Gingival blood supply?

Answer 9

Main blood supply: supraperiosteal blood vessels which anastamose with blood vessels from the alveolar bone and PDL.

Question 10

What are the nerve supplies to the gingival tissue and teeth?

Answer 10

• Maxillary anterior: Infraorbital nerve
• Maxillary posterior: alveolar superior posterior nerve
• Mandibular anterior: mental nerve
• Mandibular buccal gingival tissue: buccal nerve
• Palatal tissue upper posterior: major palatine nerve
• Palatal tissue lower posterior: sublingual nerve.