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28 Cards in this Set
- Front
- Back
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Embryology is the study of prenatal development, which begins with ____ & continues until ____. |
fertilization; birth |
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Embryology is divided into three periods: |
1. preimplantation 2. embryonic 3. fetal |
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The midface and all structures of the oral cavity EXCEPT the posterior part of the tongue develop from the |
*A. frontal process and first branchial arch B. frontal process and second branchial arch C. stomodeum and buccopharyngeal membrane D. forebrain and tuberculum impar
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The formation of an ameloblast from cells of the inner enamel epithelium is an example of |
*A. histodifferentitation B. morphodifferentitation C. odontogenesis D. dentinogenesis |
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Which structure becomes the dentinoenamel junction of the fully formed tooth? |
A. outer enamel epithelium B. stellate reticulum *C. basement membrane D. dental papilla |
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Tooth development begins when a localized growth of cells on the jaw ridge produces a strand of epithelium. What is this strand called? |
A. tooth germ B. tooth bud *C. dental lamina D. enamel organ |
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Which of the following develops into the posterior one third of the tongue? |
A. Meckel's cartilage *B. Copula C. Tuberculum impar D. Lingual swellings |
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Which of the following determines the shape of the tooth root? |
A. Rests of malassez B. Stellate reticulum *C. Hertwig's sheath D. Dental lamina |
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Enamel contains which percentage of inorganic substance? |
A. 4% B. 38% C. 74% *D. 96% |
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Which of the following is created with the changes in direction of developing enamel rods? |
A. lines of retizius *B. hunter-schregar bands C. perikymata lines D. neonatal lines |
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Of what are perikymata an external manifestation? |
*A. lines of retizius B. hunter-schreger bands C. lines of ebner and owen D. enamel spindels |
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An enamel pearl is: |
A. located on the occlusal surface, causing discomfort during chewing *B. confused with calculus because of its location C. present as an opacity ring on the facial surface of anterior teeth D. located within the pulp chamber, obliterating the blood supply |
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Where are odontoblast nuclei located in a tooth? |
A. predentin B. dentinal tubules *C. pulp tissue D. periodontal ligament |
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Where is cellular cementum MOST likely to be found? |
*A. at the apical portion of the tooth B. at the cementoenamel junction C. Equally throughout the root surface D. Closest to the dentin |
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A chronic inflammation of a tooth that causes a localized thickening of cementum is referred to as |
A. a cementicle *B. hypercementosis C. cementogenesis D. a cementoid |
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Rank the following tissues from MOST to LEAST resistant to abrasion: |
A. dentin, enamel, cementum B. enamel,cementum, dentin *C. enamel,dentin, cementum D. cementum, enamel, dentin |
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One of the following is NOT true as the pulp ages. Which ones is the EXCEPTION? |
A. vascularity decreases B. pulp chamber size decreases *C. mineralization decreases D. sensitivity increases. |
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At which location does cementum have the greatest thickness? |
*A. at the apex or furcation areas B. closest to the cementoenamel junction C. At sharpy's attachment sites D. at mesial root surfaces |
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Which cells are MOST active on the mesial side of a tooth being translated mesially during orthodontic treatment? |
A. Fibroblasts B. Osteoblasts C. Cementoblasts *D. Osteoclasts |
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Which is the MOST common type of epithelium found in the oral cavity? |
*A. stratified squamous B. cuboidal C. transitional D. simple squamous |
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One of the following lingual papillae is NOT considered a primary location for taste buds. Which one is the EXCEPTION? |
A. circumvallate B. Fungiform *C. Filiform D. Foliate |
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Epithelial rests of Malassez are associated with which of the following? |
A. dental sac B. dental papilla *C. enamel organ D. lamina dura |
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Which of the following lingual papillae is MOST keratinized? |
A. circumvallate *B. filiform C. foliate D. fungiform |
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Which of the following types of bone tissue increases in amount because of an increase in occlusal activity? |
A. cortical *B. trabecular C. circumferential D. lamellar |
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The histological pocket depth is: |
*A. less than the clinical probing depth B. equal to the clinical probing depth C. greater than the clinical probing depth D. lessened as periodontal disease increases |
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One of the following is NOT true of sclerotic dentin. Which one is the EXCEPTION? |
A. more rapid progression of caries than in normal dentin B. located in MOST older teeth C. located where odontoblasts have degenerated D. formed from calcium salts have filled dentinal tubules |
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Corkscrew-shaped structures that lie among dentin are called: |
A. Tomes fibers B. Korffs fibers C. enamel spindles D. dentinal tubules |
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What is a commissural lip pit? |
A. cancerous lesion on lips B. sunburned lips that are chapped C. dimplelike invaginations of the corner of the lips D. disturbance of lip development in utero |
