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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