Odontogenesis Flashcards
3 stages of odontogenesis?
- Bud stage
- Cap stage
- Bell stage
Horse shoe shaped band of thickened epithelium in the mandibular and maxillary arches?
Primary epithelial band
Enamel organ is composed of? (4)
- Outer and inner enamel epithelium
- Stellate reticulum
- Stratum intermedium
Star shaped network of cells found at the center of the enamel organ?
Stellate reticulum
Found between the stellate reticulum and inner dental epithelium?
Stratum intermedium
Serves as the enamel pulp?
Stellate reticulum
Tooth germ comprises of? (3)
- Enamel organ
- Dental papilla
- Dental follicle/sac
Transitory structures (3)
- Enamel knot/Aherns knot
- Enamel cord
- Enamel navel
Condensation of cells found at the midportion of the enamel organ?
Enamel knot
Vertical extension of the enamel knot towards the outer enamel epithelium?
Enamel cord
Indentation found at the outer enamel epithelium?
Enamel navel
It forms the site of the future cusp tips or incisal edge?
Enamel navel
Part of the enamel organ containing the mucoid fluid?
Stellate reticulum
3 physiologic processes of odontogenesis?
- Morphodifferentiation
- Histodifferentiation
- Apposition
It determines the shape of the crown?
Membrana preformativa
Membrana preformativa is also called?
Basement membrane
It marks the line which will become the DEJ of the finished tooth?
Membrana preformativa
It initiates the peripheral cells of the dental papilla to become odontoblasts.
Preameloblasts
What causes the preameloblasts to become ameloblasts?
Secretion of dentinal matrix by the odontoblasts
True or false. Predentin is completely organic when formed?
True
This process is responsible for the production of enamel in the form of rods?
Tome’s process
Which is formed first: enamel or dentin?
Dentin
Final product of ameloblasts which is a protective covering of the enamel?
Primary enamel cuticle
Primary enamel cuticle is also called?
Nasmyth’s membrane
Fusion of the enamel organ will form the?
Reduced enamel epithelium
Also called “dental cuticle”?
Secondary enamel cuticle
Is the secondary enamel cuticle mineralized or non mineralized?
Non mineralized
Dental cuticle is produced by?
Reduced enamel epithelium
When the reduced enamel epithelium combines with the oral epithelium, it is now called?
Junctional epithelium
It divides the dental lamina into two?
Enamel niche
Dental lamina found in the labial?
Lateral lamina strand
Dental lamina which gives rise to the succedaneous teeth?
Dental lamina proper or Successional lamina
Gives rise to the bud of permanent molars?
Accessional tooth germ
Succesional lamina is found on the labial or lingual side?
Lingual
Remnants of dental lamina?
Glands of Serres
Disturbed dental lamina may cause? (3)
- Supernumerary teeth
- Cyst or tumor
- Epithelial mass
Point where OEE and IEE come together?
Cervical loop
HERS is formed before or after the crown is completed?
After the crown is completed
Formed when HERS bend at a nearly 45 degree angle?
Epithelial diaphragm
Determines the number of roots?
Epithelial diaphragm
Articular membrane on the surface of the root?
Enameloid
What produces enameloid?
Outer root sheath cells
Remnants of HERS?
Epithelial rests of Malassez
Persistent HERS may cause? (3)
Enamel pearl
Cementicles
Cyst or tumors
Point where the epithelial diaphragm of a multirooted tooth will meet?
Bifurcation/trifurcation
A condition where teeth may develop in abnormal locations such as in ovary and hypophysis?
Dermoid cyst
Partial anodontia
Hypodontia
Presence of supernumerary teeth?
Hyperdontia
Hyperdontia is more commonly observed in the maxilla or mandible?
90% in maxilla
Extra molars/4th molar
Disto/paramolars
Intrinsic stains caused by taking antibiotic during tooth development?
Tetracycline stains
Teeth being present at birth?
Natal teeth
Mottling of the enamel?
Fluorosis
Disturbance in morphodifferentiation of the tooth may cause? (3)
- Extra cusp
- Twinning/gemination
- Hutchinson’s incisor/notch