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141. All of the following are associated with the bell stage of tooth development except
 

a. tooth "germ" first appears
b. capillaries invade dental papilla
c. primordium of successional tooth develops
d. dental lamina disintegrates
e. nervous plexus develops in dental papilla

 
142. Which one of the following is the most accurate in respect to dental pain?
 

a. dentin is more sensitive when the pulp is inflamed
b. agents that cause pain when applied to skin cause pain when applied to dentin
c. synaptic nerve endings have been demonstrated between pulpal nerves and

odontoblasts

d. dentin is uniformly sensitive
e. a local anesthetic applied to exposed dentin eliminates dentin sensitivity

143. Pick the correct series that lists the parts of the mature tooth in the order of increasing

inorganic content.

a. enamel, dentin, cementum, pulp
b. cementum, dentin, enamel, pulp
c. cementum, pulp, dentin, enamel
d. pulp, cementum, dentin, enamel
e. pulp dentin, cementum, enamel

 
144. Sharpey's fibers are formed principally by
 

a. osteoblasts
b. fibroblasts
c. odontoblasts
d. epithelial cells in the rests of Malassez
e. cementoblasts

145. 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