971. Dentin becomes harder with age because of a general increase in
A. interglobular dentin
B. secondary dentin
C. denticles
D. peritubular dentin
E. intertubular dentin
972. Preparing a tooth for a restoration may stimulate all of the following actions except
A. an increase in the number of dentinal tubules
B. death of odontoblasts
C. sclerotic dentin formation
D. dead tract formation
E. irregular dentin formation
973. Odontoblastic processes extend into
A. enamel lamellae
B. enamel tufts
C. enamel spindles
D. reduced enamel epithelium
E. perikymata
974. Which one of the following is incorrectly matched?
A. epithelial (Hertwig’s) root sheath – epithelial rests (of Malassez)
B. ameloblasts – enamel pearl
C. dental lamina – epithelial (Serre’s) pearl
D. cementoblasts – pulp stones
E. odontoblasts – enamel spindles
975. In considering the process of eruption, the prefunctional eruptive stage of a tooth beginswhen the
A. cap stage begins
B. bell stage begins
C. dental lamina begins forming
D. bud stage begins
E. none of the above
976. All of the following cell types may produce collagen fibers except?
A. odontoblasts
B. ameloblasts
C. cementoblasts
D. osteoblasts
E. chondroblasts
977. Mitochondria in association with basal infoldings of the plasmalemma arecharacteristically found in
A. excretory duct cells
B. serous cells
C. intercalated duct cells
D. mucous cells
E. striated ( secretory) duct cells
978. The epithelial rests (of Malassez) arise from
A. dental follicle
B. outer dental epithelium
C. epithelial root sheath
D. dental organ
E. inner dental epithelium
979. In general, the deeper a cavity preparation is made into the dentin the
A. less concentrated the dentinal tubules
B. less permeable the dentin structurally
C. weaker the remaining dentin (or stronger etc.)
D. greater the amount of peritubular dentin(& lesser)
E. fewer odontoblasts are affected
980. When an oral surgeon extracts a mandibular first molar, all of the principal fibers of theperiodontal ligament are torn from their attachment to alveolar bone except for the
A. transeptal fibers
B. oblique fiber
C. interradicular fibers
D. dentoperiosteal fibers
E. alveolar crest fibers
NOTE
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