CHAPTER 5 - DEVELOPMENT OF TEETH
Enamel forms from which type of cells? a. Ectoderm b. Mesoderm c. Endoderm d. Dental papilla
A
The periodontal ligament attaches which two surfaces? a. Alveolar bone and cementum b. Alveolar bone and enamel c. Cementum and attached gingiva d. Cementum and free gingiva
A
The stages of tooth development occur in which order? a. Bud, cap, bell b. Bell, bud, cap c. Cap, bell, bud d. Bud, bell, cap
A
Tomes processes develop in which stage of ameloblast differentiation? a. Secretion b. Protection c. Maturation d. Organization
A
Which permanent tooth forms from the general lamina? a. Molar b. Incisor c. Canine d. Premolar
A
Which tissue does not support the dentition? a. Enamel b. Cementum c. Alveolar bone d. Periodontal ligament
A
Accessory root canals connect the __________. a. cementum with the enamel b. pulp with the periodontal ligament c. dentin with the alveolar bone proper d. enamel with the junctional epithelium
B
During root development, the epithelial diaphragm __________. a. fuses to the stratum intermedium b. surrounds the apical opening of the dental pulp c. forms the cortical plate, which covers the mandible d. deposits an enamel matrix along the dentoenamel junction
B
Odontoblasts are derived from which type of cell? a. Follicular b. Neural crest c. Ectodermal d. Oral epithelial
B
Predentin calcifies to form dentin within ____ hours. a. 12 b. 24 c. 48 d. 72
B
Which cells of the enamel organ assist ameloblasts in forming enamel? a. Stellate reticulum b. Stratum intermedium c. Inner enamel epithelial d. Outer enamel epithelial
B
Which is a genetic disorder that makes teeth susceptible to excessive wear? a. Cleft lip b. Cleft palate c. Dentinogenesis imperfecta d. Thyroglossal duct cyst
C
Which is the first functional stage of change that each ameloblast undergoes? a. Secretion b. Maturation c. Morphogenesis d. Organization and differentiation
C
Which of the following best defines the primary cuticle? a. Mineralized, mature enamel. b. A cell junction complex, which attaches one ameloblast to another. c. An organic substance secreted on the surface of enamel by ameloblasts. d. An unmineralized protein secreted by ameloblasts in a young enamel matrix.
C
Which of the following best defines the term reduced enamel epithelium? a. Noncalcified cementum b. Material deposited by odontoblasts in response to trauma c. Fused layer of ameloblasts, enamel epithelium, and stratum intermedium d. Layer of outer root sheath cells that disperse into small clusters around the root
C
Which sequence reflects the correct order of appearance? a. Predentin, ameloblasts, enamel, odontoblasts b. Ameloblasts, enamel, odontoblasts, predentin c. Ameloblasts, odontoblasts, predentin, enamel d. Odontoblasts, enamel, ameloblasts, predentin
C
Which two cellular layers fuse to form the root sheath? a. Ameloblast and odontoblast cells b. Cementoid and epithelial rest cells c. Inner and outer enamel epithelial cells d. Stratum intermedium and stellate reticulum cells
C
After the enamel organ differentiates, the dental lamina begins to __________. a. divide b. reform c. expand d. degenerate
D
Which layer of the enamel organ is most closely associated with blood vessels? a. Stellate reticulum b. Stratum intermedium c. Inner enamel epithelium d. Outer enamel epithelium
D
Which type of bone forms between the roots of multirooted teeth? a. Alveolar bone proper b. Lamina dura c. Haverisan bone d. Interradicular
D
________ operates as a blueprint or pattern to guide root formation. a. Predentin b. The primary cuticle c. Reduced enamel epithelium d. Hertwig's epithelial root sheath
D
Ameloblasts secrete enamel before odontoblasts secrete predentin.
False
Compact bone is the most highly calcified tissue in the human body.
False
Primary teeth begin development at birth.
False
The root lengthens more rapidly than the tooth erupts.
False
The terminal bar apparatus is a series of hemidesmosomes.
False
The successional lamina is vital to the development of primary teeth.
Flase
A patient with oligodontia is congenitally missing more than six permanent teeth.
True
Bone, dentin, cementum, and enamel grow through incremental deposition.
True
Cementoblasts, fibroblasts, and osteoblasts originate from dental follicular cells.
True
Precursor odontoblast cells use cell signaling to determine the correct starting position.
True
Tooth development relies on an interaction between the ectoderm and mesenchyme.
True
