951. Which feature of cellular cementum best differentiates it from acellular cementum?
A. position on tooth
B. lacunae
C. separate and distinct functions
D. embedded Sharpey’s fibers
E. an incremental growth pattern

952. In the keyhole concept for the shape of the cross-section of enamel rods
A. the crystallites in the head lie parallel to the surface of the enamel
B. the tails are directed mesially
C. the heads are directed mesially
D. the tails are directed incisally
E. the heads are directed incisally

953. The epithelial (Hertwig’s) root sheath is involved in the formation of
A. enamel
B. Crown
C. root
D. coronal pulp chamber
E. epithelial pearls

954. Mucous secreting cells are least appropriately described as having
A. lighter stained cytoplasm than serous cells
B. flattened nuclei
C. relatively vacant appearing cytoplasm
D. distinct cell boundaries
E. the ability to form demilunes

955. Which one of the following glands would possess numerous demilunes?
A. parotid
B. Palatine
C. posterior lingual
D. von Ebner
E. sublingual

956. Sharpey’s fibers are generally oriented in cementum
A. parallel to collagenic fibers produced by cementoblasts
B. randomly
C. parallel to the surface of cementum
D. perpendicular to the dentinocemental junction
E. either b or c

957. Acid-etching of surface enamel to create a surface for better binding with dentalmaterials most commonly
A. preferentially removes centers of rods
B. dissolves hydroxyapatite crystals more readily in a direction perpendicular to theirlong axis
C. shows little correlation with key-hole-shaped rods
D. bears no resemblance to rod structure
E. preferentially removes peripheries of rods

958. Ameloblasts are derived from
A. dental papilla
B. outer dental epithelium
C. inner dental epithelium
D. dental sac
E. ectomesenchymal cells

959. Which one of the following activities of the dental organ continues for the longest timewith the development of any tooth?
A. morphogenic
B. organizing
C. formative
D. maturational
E. protective

960. The formation of cementum results when the dental organ
A. adheres to dentin
B. becomes discontinuous over dentin
C. is in its secretory stage
D. is in its protective stage
E. forms an epithelial diaphragm

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