QUESTION 1

1. 2 weeks
2. 3 weeks
3. 4 weeks
4. 5 weeks
5. 6 weeks

QUESTION 2

1. are of mesodermal origin
2. are located in the periodontal ligament
3. are formed from cells of the dental papilla
4. can form into cysts
5. b and d are correct

QUESTION 3

1. mesial shift occurs during the third phase of eruption
2. the epithelial root sheath of hertwig occurs during phase I of eruption
3. Phase 2 begins with the start of root formation
4. a permanent tooth moves toward the oral cavity along the gubernacular canal
5. all are incorrect

QUESTION 4

1. resorb bone
2. are of ectomesodermal origin
3. have an eosinophilic cytoplasm
4. are multinucleated cells
5. originate from spermatogonia

QUESTION 5

1. deafness, keratitis, mulberry molars
2. deafness, arrythmia, incontinence
3. deafness, mental retardation, sweating
4. deafness, keratitis, hair loss
5. keratitis, impotence, deafness

QUESTION 6

1. Enamel lamellae extend from the enamel to the pulp
2. Enamel lamellae are areas of hypomineralized tissue
3. Enamel tufts are hypomineralized rods running in the same direction
4. Enamel spindles are extensions of fibroblasts
5. Enamel lamellae have a club shaped appearance

QUESTION 7

1. mantle dentine
2. interglobular dentine
3. peritubular dentine
4. intertubular dentine

QUESTION 8

1. nerves lose their myelin sheath past the plexus of Raschkow
2. false pulp stones do not contain dentinal tubules
3. the cell rich layer contains fibroblasts
4. reserve cells can become odontoblasts
5. fibroblasts secrete type IV collagen