Term
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Definition
| Primary dentin is dentin that is laid down before and during tooth eruption |
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Term
| What is secondary dentin? |
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Definition
| Dentin that is formed after root formation is complete. Responsible for the reduction of the pulp chamber over time |
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Term
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Definition
| Dentin that is responsible for responses to insults upon the dentin/pulp. |
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Term
| Types of tertiary dentin? |
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Definition
Regular- dentin laid down by odontoblasts in response to a slow insult.
Irregular - formed by fibroblast in response to the sudden death of odontoblasts |
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Term
| Compare the rates of dentin deposition for primary and secondary dentin |
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Definition
| Primary dentin depostion is faster than secondary dentin depositon. |
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Term
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Definition
Mantle Dentin
Circumpulpal dentin |
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Term
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Definition
| Mantle dentin is the first dentin laid down during tooth development. It is less mineralized than circumpulpal dentin and contains van korffs fibers, which is thick type 3 collagen |
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Term
| what is circumpulpal dentin? |
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Definition
| Majority of primary dentin. More mineralized than mantle dentin. Forms most dentin surrounding pulp (except space occupied by secondary dentin) |
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Term
| What areas of the pulp chamber is secondary dentin more heavily deposited? |
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Definition
| Roof and floor of pulp chamber |
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Term
| Compare the directions of coronal dentin vs root dentin. |
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Definition
| Coronal dentin forms an S shape for its primary structure. Radicular dentin is rather straight |
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Term
| What are the structural features (primary/secondary) of dentinal tubules? |
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Definition
1 = S shape
2 = jagged nature = changes in odontoblast direction |
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Term
| What happens to dentinal tubules at the junction of primary and secondary dentin? |
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Definition
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Term
| Compare the number of dentinal tubules in primary and secondary dentin |
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Definition
| More tubules in primary dentin |
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Term
| Which dentin lay closest to the DEJ? |
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Definition
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Term
| Which dentin lay closest to the DCJ |
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Definition
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Term
| What is sclerotic dentin? |
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Definition
| Hypermineralized peritubular dentin that reduces the width of dentinal tubules. Less sensation |
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Term
| Where is inerglobular dentin located? |
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Definition
| Dentin separating the mantle and circumpulpal dentin |
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Term
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Definition
| Globular masses of dentin that are hypermineralized |
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Term
| What is interglobular dentin? |
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Definition
| Lesser mineralized dentin areas resulting from globular mode of dentin formation (less mineraized than globular dentin) |
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Term
| What is linear dentin calcification? |
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Definition
| Slower process of dentin depositon. More uniformly calcified dentin |
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Term
| What are the daily imbrication lines of dentin tubules called? |
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Definition
| Daily imbrication lines of Von Ebner (similar to the imbrication lines of enamel rods) |
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Term
| What are contour lines of Owen? |
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Definition
Segments of dentin tubules that have responded to environmental insults.
Neonatal line = exaggerated line of owen |
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Term
| What is the granular layer of Tomes? |
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Definition
CEJ -> root apex it increases in width
Hypomineralized dentin near roots |
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Term
| Rate of dentin deposition is faster/slower in the coronal portion of the tooth? |
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Definition
| Radicular deposition is slower. |
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Term
| What is the hyaline of hopewell-smith? |
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Definition
| Helps adhere dentin to cementum. Clear layer between Tomes and cementum |
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Term
| The two modes of calcification in circumpulpal dentin are? |
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Definition
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