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167. 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

 
168. Odontoblastic processes extend into
 

a. enamel lamellae
b. enamel tufts
c. enamel spindles
d. reduced enamel epithelium
e. perikymata

 
169. 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

 
170. In considering the process of eruption, the prefunctional eruptive stage of a tooth begins

when the

a. cap stage begins
b. bell stage begins
c. dental lamina begins forming
d. bud stage begins
e. none of the above

 
171. Enamel tufts are
 

a. hypomineralized areas of dentin
b. hypermineralized areas in dentin
c. hypomineralized areas in enamel
d. similar to enamel spindles
e. hypermineralized areas in enamel

 
172. All of the following cell types may produce collagen fibers except?
 

a. odontoblasts
b. ameloblasts
c. cementoblasts
d. osteoblasts
e. chondroblasts