Bell Stage
What weeks do the bell stage occur?
11th-12th
When does the apposition stage occur?
When is the maturation stage reached?
-Various times
-The matrices of the hard dental tissue types subsequently fully mineralize to their correct levels
What is local dysplasia?
Trauma or infection occurring to a small group of ameloblasts
When does root development complete?
Long after the crown.. when the tooth is starting to erupt in the oral cavity
How many types of cells are found within the enamel during this stage?
4
What are the main processes in the apposition stage?
Induction and Proliferation
What are the main processes of the maturation stage?
Maturation
Larger number of ameloblasts and may result from traumatic birth, systemic factors, nutritional deficiencies, or dental fluorosis
What is taurodontism?
Having larger pulp chambers where the chamber floor is displaced apically and lacks CEJ
Between the outer enamel epithelium and inner enamel epithelium, what are the two innermost layers (or dental core)?
-Stratum intermedium
-Stellate Reticulum: star shaped cells in many layers
What happens in the apposition stage?
Dental tissue types are produced in successive layers as matrix
Where do the odontoblasts go during the maturation stage?
They remain within adjoining pulp
Where does a Hutchinson's tooth usually occur?
Anterior Teeth
What are some clinical considerations with root formation?
Enamel pearl and cervical enamel projection
What are the main processes of the bell stage?
-Proliferation
-Differentiation
-Morphogenesis
What layers does the apposition stage occur between?
Ectodermal tissue of enamel organ and mesenchymal tissue of the dental papilla and dental sac
(RECIPROCAL INDUCTION)
Where do Mulberry teeth usually occur?
Posterior Teeth
Fused tissue of the PEE and oral epithelium
What are the bell stage structures outer to inner?
-Dental sac
-Outer epithelium
-Stellate Reticulum
-Stratum intermedium
-Inner enamel epithelium
-Outer cells of dental papilla
-Central cells of dental papilla
During mineralization, which part of the tooth is the hardest?
-enamel
-then dentin
-then cementum
What happens to the dental tissue in this stage?
It fully mineralizes to its mature form
What is a Turner spot?
A less significant single hypocalcified affected with a whitish area. When the entire tooth is covered, it is called Turner tooth
What is a odontoma?
Benign neoplasm of odontogenic origin