DENTINOGENESIS Flashcards
Process of dentin formation
Dentinogenesis
Stage where is dentin is deposited
Late bell stage
Formative cells of dentin
Odontoblasts
Formative organ
Dental papilla
Embryonic origin of dentin
Ectomesenchyme
Terminal bar apparatus is formed at the
DISTAL POLE OF PRE ODONTOBLASTS
First sign of dentin formation is the appearance of large diameter collagen fibers called
Von korff’s fibers
Deposition of crystals in several distinct areas of matrix-calcospherites
Globular mineralization
Globular mineralization occurs un the
Globular fascia
Globular masses enlarge and fuse to form a SINGLE CALCIFIED MASS
Globular mineralization
Reason why dentin is sensitive
Enamel spindle
Intratubular nerve
One of the most unusual feature of the dentin pulp complex
Dentin sensitivity
Overwhelming sensation perceived by dentin pulp complex is
Pain
Dentin is more sensitive along
Dej and near pulp
Stimuli: sentivitity of dentin
Air water spray
Contact w a bur or probe
Dehydration
Theories in dentin sensitivity
Direct conduction
Transduction
Hydrodynamic
Theory:
Dentin is DIRECTLY INNERVATED bec of intratubular nerve is inside the den tubule.
Limitation: SOME TUBULES DONT HAVE NERVE
direct conduction
Theory:
Odontoblasts act as RECEPTOR
It would transmit to the receptors in the pulp proceed to brain and perceived as PAIN
Transduction
Theory:
Fluid movt through the tubules stimulates receptors in the pulp
Disturbance on surface of dentin gets propagated down in the pulp>brain>pain
Hydrodynamic theory
Receptors found in PULP
Transduction
Hydrodynamic
Receptors found inside the dentinal tubule
Direct conduction theory
How does dentin HYPERSENSITIVITY occur?
It occurs when DENTIN becomes EXPOSED and TUBULES are OPEN at the dentinsurface
2 treatment approaches
- Interrupt the neural response to pain stimuli
2. Occlude OPEN TUBULES to block the hydrodynamic mechanism
Disturbance of matrix formation and dentin mineralization
Dentinogenesis imperfecta
