31

 
162. 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

 
163. All of the following groups of principal fibers of the periodontal ligament are present in

all permanent teeth except

a. cervical
b. alveolar crest
c. transeptal
d. interradicular
e. apical

 
164. 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

 
165. 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

 
166. Dentin becomes harder with age because of a general increase in
 

a. interglobular dentin
b. secondary dentin
c. denticles
d. peritubular dentin
e. intertubular dentin