Developmental Disturbances
Occurs in the cap stage of tooth development when an enamel organ abnormally invades the dental papilla.
What is dens en dente?
Ectoderm, mesoderm, and endoderm.
What are germ layers that make up the trilaminar disc.
The germ layer that forms the epithelial lining of the oral cavity.
What is ectoderm?
Remnants of Hertwig epithelial root sheath.
What is rests of Malassez?
A crown structure derived of ectoderm.
What is enamel?
Lack of fusion of the medial nasal and maxillary processes.
What is a cleft lip?
The superior layer of the embryonic bilaminar disc.
What is the epiblast layer?
The structure where the thyroid gland migrates from.
What is foramen cecum?
The structure specifically responsible for the beginning of the development of the root.
What is cervical loop?
3 tooth germ layers that develop during the cap stage.
What is enamel organ, dental papilla, and dental sac?
Failure of fusion of the palatal shelves with the primary palate and/or with each other.
What is cleft palate?
A zygote that undergoes mitosis and secretion of fluid by the cells within the morula.
What is a blastocyst?
Neural crest cells migrate from the neural folds and join the mesoderm.
What is the formation of mesenchyme?
The portion of the tooth germ that is the primary source of the periodontal ligament.
What is dental sac?
The dental sac forms 3 structures.
What is periodontal ligament, cementum, and alveolar process?
A single tooth germ tries to divide into 2 tooth germs. Results- 1 large single rooted tooth with one pulp, # of teeth normal, false macrodontia.
What is gemination?
Forms within the bilateral embryonic disc creating bilateral symmetry.
What is the primitive streak?
2 mandibular processes (2 bulges of tissue inferior to the stomadeum) fuse at midline.
What is mandibular arch formation?
This structure induces odontoblasts to secrete predentin in the root.
What is inner enamel epithelium of Hertwig's epithelial root sheath?
The outer cells of the dental papilla are induced to differentiate into:
What is odontoblasts?
The union of 2 adjacent tooth germs. Results- False macrodontia, 2 pulps, arch has 1 less tooth.
What is fusion?
Fertilized egg=zygote. After mitosis, ball of cells is morula. On going process mitosis zygote becomes a blastocyst. By end of first week blastocyst implants into endometrium.
What is the pre-implantation of prenatal development?
2 medial nasal processes fuse to form intermaxillary segment or primary palate, anterior 1/3 palate. Bilateral maxillary processes give rise to 2 palatal shelves. 2 palatal shelves will grow vertically, and flip up after tongue moves, grow horizontally and fuse to for secondary palate or posterior 2/3 of hard palate and soft palate. Primary palate fuses with secondary palate to form final palate.
What is palate formation?
How many horizontal epithelial extensions or flaps will be involved in root formation for a tooth with two roots?
What is two?
IEE differentiates into Pre-ameloblasts. Pre-ameloblasts induce outer cells of the dental papilla to differentiate into odontoblasts. Odontoblasts secrete pre-dentin. BM disintegrates Dentin comes in contact with pre-ameloblasts and induces to differentiate into ameloblasts. Ameloblasts secrete enamel matric via tomes process.
What is formation of the enamel matrix during the apposition stage of tooth development?