reem hussam dentin
TRANSCRIPT
Dentin
Topics
Formation of New Dentin
Pain and pulp-dentin complex
Clinical Consideration
Formation of New DentinTypes of Dentin
Primary Secondary Tertiary
Reactionary
Reparative
Secondary Dentin• Cause: Aging• Develops after Root
Formation is completed.• On entire pulpal surface• The deposition is continuous
with primary but:i)slowerii)Fewer tubulesiii)Tubules change direction to a more wavy course
• In multi-rooted teeth, it’s thicker on the roof and floor of pulp chamber
Tertiary Dentin • Forms at a localized area in reaction
to a stimulus• Dentinal tubules less in number and
irregular arrangement• There are 2 types of Tertiary Dentine
Types of Tertiary DentinReactionary
Pre-existing odontoblast
Reparative
Newly differentiated ectomesnchymal cells
Reactionary
Reparative
Reactionary
Reparative
Reactionary dentin
Types of Reparative dentine
Topics
Formation of New Dentin
Pain and pulp-dentin complex
Clinical Consideration
Innervation of Dentin
• Subodontoplastic plexus of Raschkow
• The nerve will loose its mylien sheath then pass between the odontoblasts bodies and enter the dentinal tubules
Topics
Formation of New Dentin
Pain and pulp-dentin complex
Clinical Consideration
Clinical considerations
1. Permeability of dentin2. Response to external stimuli3. Adhesion of dental materials to dentin4. Endodontics5. Sensitivity6. Forensic Dentistry
Permeability of DentinDepends on:
Dentin surface(exposed by)
Caries
Attrition
Abrasion
trauma
Tubules(patent or occluded)
Exogenous material
Intertubular dentin
Tertiary Dentin
Adhesion of Dental materials to dentin
Endodontics• With age, secondary
and tertiary dentin are formed causing obliteration to the pulp chamber and root canal
• Treatment and prognosis in older patients is less effective
Sensitivity
• Reduction of sensitivity by occluding patent dentinal tubules by precipitation of crystalline oxalates
Forensic Dentistry• Dry teeth of
unknown dead body contain mitochondrial DNA of the interatubular nerve which are protected within the tubules could help in identification of the dead body.
Topics
Formation of New Dentin
Pain and pulp-dentin complex
Clinical Consideration
• Made by: Reem Hussam (83) Section 2