D514 Lecture 5: Tooth Development Questions
with Complete Solutions
What is found in the crown of the tooth?
enamel, dentin, and pulp
What is found in the root of teeth?
dentin, pulp, and cementum
periodontum
-Structures that surround, support, and are attached to the teeth
-gingiva, periodontal ligament, cementum, alveolar bone proper
stages of tooth development
1. initiation - induction
2. bud stage - proliferation
3. cap stage - proliferation, differentiation, morphogenesis
4. bell stage - histodifferentiation, morphodifferentiation
5. apposition
6. maturation/calcification
What initiates tooth development?
interaction b/w epithelium and underlying mesenchyme
mesencyme
-embryonic connective tissue
-developed from mesoderm
, ectomesenchyme
-a type of mesenchyme from the ectoderm, with neural crest cell origin
-the mesenchyme seen in the oral cavity
primary epithelial bands
-stage 1: initiation
-at 6 weeks of intra-uterine development, ectoderm covering oral cavity is composed
of epithelium 2-3 cells thick
-Where the future maxilla or mandible is going to develop, the oral epithelial cells will
proliferate more and form a primary epithelial band
-in the area of the future alveolar processes, this oral epithelium proliferates to form
horse shoe/U-shaped primary epithelial bands
layers seen on the head of an embryo at 6 weeks intrauterine
-oral epithelium covering entire structure with ectomesenchyme below
-primary epithelial band from epithelial cells proliferating where future maxilla or
mandible is going to develop
-dental and vestibular lamina directly above/below future mandible/maxilla
2 subdivisions or lamina that each primary epithelial band gives rise to
dental lamina and vestibular lamina
dental lamina
-forms first (before vestibular lamina)
-formed from oral epithelium invaginating into the ectomesencyme
-will form the tooth bud and later the tooth
with Complete Solutions
What is found in the crown of the tooth?
enamel, dentin, and pulp
What is found in the root of teeth?
dentin, pulp, and cementum
periodontum
-Structures that surround, support, and are attached to the teeth
-gingiva, periodontal ligament, cementum, alveolar bone proper
stages of tooth development
1. initiation - induction
2. bud stage - proliferation
3. cap stage - proliferation, differentiation, morphogenesis
4. bell stage - histodifferentiation, morphodifferentiation
5. apposition
6. maturation/calcification
What initiates tooth development?
interaction b/w epithelium and underlying mesenchyme
mesencyme
-embryonic connective tissue
-developed from mesoderm
, ectomesenchyme
-a type of mesenchyme from the ectoderm, with neural crest cell origin
-the mesenchyme seen in the oral cavity
primary epithelial bands
-stage 1: initiation
-at 6 weeks of intra-uterine development, ectoderm covering oral cavity is composed
of epithelium 2-3 cells thick
-Where the future maxilla or mandible is going to develop, the oral epithelial cells will
proliferate more and form a primary epithelial band
-in the area of the future alveolar processes, this oral epithelium proliferates to form
horse shoe/U-shaped primary epithelial bands
layers seen on the head of an embryo at 6 weeks intrauterine
-oral epithelium covering entire structure with ectomesenchyme below
-primary epithelial band from epithelial cells proliferating where future maxilla or
mandible is going to develop
-dental and vestibular lamina directly above/below future mandible/maxilla
2 subdivisions or lamina that each primary epithelial band gives rise to
dental lamina and vestibular lamina
dental lamina
-forms first (before vestibular lamina)
-formed from oral epithelium invaginating into the ectomesencyme
-will form the tooth bud and later the tooth
