961. Serous secretory cells characteristically
A. have a nucleus flattened basally
B. have distinct lateral cell boundaries
C. have relatively vacant apical cytoplasm
D. may form demilunes
E. lack intercellular canaliculi
962. Saliva produced during stimulation by eating or by mechanical manipulations duringdental procedures arises principally from the
A. minor salivary glands
B. parotid glands
C. submandibular, sublingual and minor salivary glands
D. submandibular glands
E. sublingual glands
963. All of the following become part of the reduced enamel epithelium except
A. outer dental epithelium
B. stratum intermedium
C. ameloblast cells
D. epithelial diaphragm
E. stellate reticulum
964. Secondary (cellular) cementum differs from alveolar bone in that it
A. lacks lacunae
B. lacks hydroxyapatite crystallites
C. resorbs less readily than bone
D. has Sharpey’s fibers
E. may exhibit resting lines
965. Lines of von Ebner represent
A. cyclic metabolic changes in ameloblasts
B. cyclic metabolic changes in odontoblast activity
C. interglobular dentin
D. increment lines in enamel
E. configuration of secondary curvatures of dentinal tubules
966. Developing teeth and dental arches are separated from the developing cheeks by the
A. primary epithelial band
B. inner dental epithelium
C. dental lamina
D. vestibular bond or furrow
E. outer dental epithelium
967. The density of enamel is greatest
A. at the surface near the cervical margin of a permanent ooth
B. between the cusp and cervical regions of a permanent tooth
C. at the surface of a cusp of a permanent tooth
D. toward D-E junction of the cusp of a permanent tooth
E. toward D-E junction in the cervical margin of a permanent tooth
968. All of the following groups of principal fibers of the periodontal ligament are present inall permanent teeth except
A. cervical
B. alveolar crest
C. transeptal
D. interradicular
E. apical
969. High connective tissue papillae in the oral cavity mucosa are associated with
A. areas subjected to mechanical stress
B. swallowing action
C. tissues not supported by bone
D. nonkeratinized epithelium
E. a submucosa
970. The most highly mineralized region of dentin is the
A. intertubular dentin
B. globular dentin
C. peritubular dentin
D. interglobular dentin
E. Tomes’ granular layer
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