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178. All of the following may be observed in demineralized sections of mature teeth except
 

a. intertubular dentin
b. interglobular dentin
c. peritubular dentin
d. reparative dentin
e. globular dentin

179. The major inorganic component of dentin is
 

a. collagen
b. lactate
c. hydroxyapatite
d. lipid
e. desmosine

 
180. The presence of Tomes' processes is associated with the
 

a. formation of peritubular dentin
b. morphogenic function of dental organ
c. secretory function of dental organ
d. hypomineralized root dentin
e. intratubular nerve endings

 
181. All of the deciduous dentition has been initiated in utero by the
 

a. 6th wk
b. 7th wk
c. 8th wk
d. 10th wk
e. 16th wk

 
182. All of the tooth germs of the primary dentition are usually completed in utero by the
 

a. 4th mo
b. 6th mo
c. 7th mo
d. 8th mo
e. none of the above

183. The formation of the 1st tooth of the permanent dentition is initated in utero by the
 

a. 4th mo
b. 5th mo
c. 6th mo
d. 7th mo
e. 8th mo