Chap 5 & 6 Questions

Which occurs in the extracellular phase of hard tissue resorption?

Mineral is separated from the collagen and broken into small pieces.

Which genetic abnormality is characterized by more than six congenitally missing teeth?

oligodontia

The crown enters the oral cavity in which eruptive event?

penetration

Which best describes the root of a tooth with incisal attrition?

thickened cementum

Ameloblasts are fastened to the stratum intermedium by

desmosomes

Which type of bone forms between the roots of multirooted teeth?

interradicular

The permanent anterior teeth develop in which location relative to the incisal level of primary teeth?

lingual

__________ develop with occlusal surfaces slanting mesially.

mandibular molars

Which primary tooth root is completed last?

maxillary canine

Which cells form the dental papilla in early tooth development?

mesenchymal

A 10-year-old patient is in which dentition period?

mixed

Predentin is composed of ______ noncollagenous protein.

10%

There are ______ accessional teeth in the human dentition.

12

Which percentage of enamel is water?

5%

Which statement is TRUE? A. Primary dentin is slightly harder than permanent dentin. B. The roots of primary teeth are less divergent than permanent roots. C. Primary enamel is more highly pigmented than permanent enamel. D. The coronal pulps are relatively larger in primary teeth than in permanent teeth.

The coronal pulps are relatively larger in primary teeth than in permanent teeth.

Ankylosis occurs with the loss of an opposing tooth. Ankylosed teeth are associated with failed eruption.

The first statement is false. the second statement is true

Dentinogenesis occurs during the bell stage of tooth formation. Enamel formation is initiated prior to dentin formation.

The first statement is true, the second statement is false.

Outer enamel epithelial (OEE) cells of the enamel organ serve which function?

They organize a network of capillaries to support ameloblast cells

Which two cellular layers fuse to form the reduced enamel epithelium (REE)?

ameloblasts and stratum intermedium

The highest fiber turnover in the periodontal ligament occurs in the

apical region

Only the newly formed band of dentinal matrix along the pulpal border is uncalcified, because as each daily increment of predentin forms along the pulpal boundary, the adjacent peripheral increment of dentin formed the previous day calcifies and becomes dentin.

both statements and reasoning are correct

Which is the initial stage of early tooth development?

bud

Intraoral occlusal or incisal movement of the erupting tooth continues until which of the following occurs?

clinical contact occurs with the opposing arch

Each of these events occurs in the prefunctional phase of tooth eruption, EXCEPT one. Which is the EXCEPTION?

crown formation

The initial site of dentin formation is at

cusp tips

Which characterizes the dental papilla?

densely packed cells

Which tissue surrounds the embryonic pulp in the "cap" stage of tooth development?

dental follicle

Which cells ingest collagen fibers?

fibroblasts

Lack of eruption resulting from failure of root formatiuon may be caused by any of the following EXCEPT one. Which is the EXCEPTION? A. Crowding of teeth B. Crown-to-root fusion C. Formation of the gubernaculum D. Lack of development of the pulp proliferative zone

formation of gubernaculum

Occlusal wear of the enamel is considered part of the ___________ phase.

functional eruptive

The __________________ guides tooth movement along the eruption pathway.

gubernacular dentis

Deciduous teeth are shed for which fundamental reason?

resorption

Osteoclasts are associated with which action?

resorption

Tomes processes develop during which stage of amelogenesis?

secretion

Which is removed to increase the mineral content of enamel?

water and enamelin