Embryology Flashcards
How long do horses eat during the day?
16 hours
When is the crown formed?
Including cusp formation, during early thickening of internal enamel epithelium during Bell stage. Mineralisation of the crown begins at occlusal surface and goes down to the root, layers build upon each other.
When are the Periodontal structures formed?
As the tooth grows and elongates, the periodontal structures form during the Cap stage. The dental follicle is formed, creating the supporting tissues like the Periodontal Ligament and Alveolar Bone.
What are the 3 stages of Dental Embryology?
Bud stage, Cap stage, Bell stage
What is the Bud Stage?
Dental lamina prodcues series of epithelial swellings along the buccal margin. After initiation of odontogenesis (tooth development), epithelial cells change into ectomesenchymal cells which starts the development of the tooth. Cusp formation occurs.
What is the Cap stage?
Starts to make dentin and pulp. Starts to condense ectomesenchymal cells into thick layers, surrounding the dental organ. It starts to form the dental follicle which creates supporting tissues, like the periodontal ligament and alveolar bone.
What is the Bell stage?
Cells of internal dental epithelium form into tall column-like cells. First dentine layer is laid down along the basal membrane, causing the membrane to disintegrate. This triggers overlying internal enamel epithelial cells to differentiate into ameloblasts which kick-starts the production of enamel.
What is Cusp formation?
Occurs late into the Bud stage. A new signalling centre is formed in the middle of the tooth, the enamel knot. It serves to regulate bud to cap stage by chemical messengers. Once its done, it turns into two secondary enamel knots.
What is the Dental Sac?
Surround the enamel organ, protection and providing nutrition for it. Forming peripheral cement.
