Chapter 5*
surrounds the apical opening of the dental pulp
During root development, epithelial diaphragm _________.
ectoderm
Enamel forms from which type of cells
neural crest
Odontoblasts are derived from which type of cell?
they organize a network of capillaries to support ameloblast cells
Outer enamel epithelial (OEE) cells of the enamel organ serve which function?
24
Predentin calcifies to form dentin with _____ hours
10%
Predentin is composed of _____ noncollagenous protein
primary cuticle
What is an organic substance secreted on the surface of enamel by ameloblasts
Mesenchymal
Which cells form the dental papilla in early tooth development?
stratum intermedium
Which cells of the enamel organ assist ameloblasts in forming enamel?
densely packed cells
Which characterizes the dental papilla?
Hypodontia
Which genetic abnormality is characterized by fewer than six congenitally missing teeth?
dentinogenesis imperfecta
Which is a genetic disorder that makes teeth susceptible to excessive wear?
water and enamelin
Which is removed to increase the mineral content of enamel?
Morphogenesis
Which is the first function stage of change that each ameloblast undergoes?
bud
Which is the initial stage of early tooth development?
outer enamel epithelium
Which layer of the enamel organ is most closely associated with blood vessels?
5%
Which percentage of enamel is water?
molar
Which permanent tooth forms from the general lamina?
ameloblasts, odontoblasts, predentin, enamel
Which sequence reflects the correct order of appearance?
enamel
Which tissue does not support the dentition?
dental follicle
Which tissue surrounds the embryonic pulp in the "cap" stage of tooth development?
ameloblasts and strum intermedium
Which two cellular layers fuse to form the reduced enamel epithelium (REE)?
inner and outer enamel epithelial cells
Which two cellular layers fuse to form the root sheath?
interradicular
Which type of bone forms between the roots of multirooted teeth?
Hertwig's epithelial root sheath
________ Operates as a bluepint or pattern to guide root formation.
pulp with the periodontal ligament
Accessory root canals connect the __________.
degenerate
After the enamel organ differentiates, the dental lamina begins to ________.
desmosomes
Ameloblasts are fastened to the stratum intermedium by
third molars
The ______ are the last teeth to develop
reduced enamel epithelium
What is a fused layer of ameloblasts, enamel epithelium, and stratum intermedium?
apical region
The highest fiber turnover in the periodontal ligament occurs in the
cusp tips
The initial site of dentin formation is at the
alveolar bone and cementum
The periodontal ligament attaches which two surfaces?
bud, cap, bell
The stages of tooth development occurs in which order?
secretion
Tomes process develop during which stage of amelogenesis?
