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The earliest sign of human tooth development is found in the anterior mandibular region at the embryonic age of about
5 to 6 weeks
Which embryonic structure is specifically responsible for the development of the root
Hertwig's epithelial root
sheath (HERS) may be described as
Part of the cervical loop that functions to shape the root(s) and induce root dentin formation.
Hertwig's epithelial root sheath (HERS)
is entirely composed of:
inner and outer enamel epithelium
The cervical loop is the most cervical part of the _______ , a bilayer rim that consists only of ____ and ______
- enamel organ
- inner enamel epithelium
- outer enamel epithelium
Epithelial rests of Malassez may be described as
- A network of cells in the periodontal ligament composed of the remains
- of the inner and outer enamel epithelium
When HERS disintegrates and allows undifferentiaed cells of the dental sac to contact the newly formed surface of root dentin, the dental sac cells are induced to become immature ________
Which of the following is compressed during tooth development to form the reduced enamel epithelium
If a tooth has two roots, how many horizontal epithelial extensions or flaps will be involved in its root formation
Which of the following statements
concerning active eruption of a permanent succedaneous tooth is CORRECT?
erupts when the root is completed.
The shedding of the associated primary
tooth is intermittent.
The first junctional epithelium is from the surrounding dental sac.
The tooth actively erupts as gingival recession occurs.
The shedding of the associated primary tooth is intermittent
Match each dental anomaly listed with
Dens in dente
Tooth eruption begins at the time the:
First dentin is produce
The tooth root is completed
The tooth root begins to form
tissues of the tooth have been mineralized
the tooth root begins to form
The normal events which finally result
in the shedding of a deciduous maxiallary molar tooth are:
The deciduous tooth roots undergo a continuous, very slow resorption owing to the
presence of the developing permanent molar
The deciduous tooth roots are resorged one a a time, beginning ususally with the with the mesiobuccal root; the developing permananet tooth which will replace the deciduous molar is first seen starting to form after the deciduous root resorptin begins, and it promotes additional resorption
The deciduous tooth roots resorb rapidly the tooth loosens and is exfoiated exposing the fully formed but uncalcified corwn of the permanent tooth.
The deciduous tooth roots are slowly resorbed for a time; then for a brief period there is additonal formation of cementum and adjacent bone, resulting in reattachment of the periodontal ligament fibers and a tightening of the tooth in the bone; this is
followed by root resorption; alternating wresorption and appostion take palse
before the tooth finally loses it attachment
- The deciduous tooth roots are slowly resorbed for a time; then for a
- brief period there is additonal formation of cementum and adjacent bone,
- resulting in reattachment of the periodontal ligament fibers and a tightening of the tooth in the bone; this isfollowed by root resorption; alternating wresorption and appostion take palsebefore the tooth finally loses it attachment
In the development of a
permanent tooth, the time that the root formation is completed is about
one to four years after the tooth emerges
The enamel organs of all tooth germs develop from the dental lamina. In the development of certain permanent teeth, the enamel organ arises from the dental lamina lingual to the developing tooth germ of certain primary teeth. The permanent teeth of which this true are
all incisors, canines, and premolars
The enamel organs of all tooth germs develop from the dental lamina. In the development of certain permanent teeth, the enamel organ arises from the distal end of the dental lamina distal to the last primary tooth in the arch. The permanent teeth of which this true are
all permanent molars
The diagram below depicts the conditions in the oral cavity before the process of tooth eruption begins.
Label the parts A, B, C, D, and E accordingly:
reduced enamel epithelium
- oral epithelium
- reduced enamel epithelium REE
A residue on newly erupted teeth of both dentitions that may leave teeth extrinsically stained, and is the residue of the REE, oral epithelium, and cuticle placed by the ameloblasts is:
Which portion of the tooth germ is the primary source of the periodontal ligament
dental follicle/dental sac
Herwig's epithelial root sheath
central cells of dental papilla
outer cells of the dental papilla
dental follicle/dental sac