After endodontic therapy is completed on a tooth with a periapical radiolucency, it usually
takes ____ before marked reduction in the size ofthe radiolucency is evident on an x-ray.
Desired apical changes include (3):
1. 6-12 months
a) regeneration of alveolar bone,
b) deposition of apical cementum,
c) re-establishment of the PDL
A hard tissue barrier
(reparative dentin bridge) may be visualized as early as ___ postoperative.
if an accessory canal is not totally filled during obturation, the appropriate
treatment is to observe the tooth and evaluate every _____.
lf a lesion is present on the mesiobuccal root pior to root canal therapy and doesn't heal in the usual amount of time (___) following treatment, it is most
likely due to a ____ (mesiolingual).
1. 6-12 months
2. missed canal
Calcium hydroxide has a high pH of __ which ____ tissue and causes
This necrotic zone encourages the pulp to induce ____ with secondary
odontoblasts laying down ___.
4. hard tissue repair
5. reparative dentin.
Immediately adjacent to the odontoblast layer in the pulp, __ to __ microns (Mm) ofthe dentin matrix
If this unmineralized layer of dentin is lost (e.g., due to trauma or
infectious process) it predisposes the dentin to ____ ___by odontoclasts.
This unmineralized dentin is called ___
3. internal resorption
Types of dentin:
1. ____ is first-formed dentin which is laid before odontoblast layer gets
organized. Hence the pattern of deposition and size ofcollagen fibers is different from circumpulpal dentin.
2. ____ represents most of the dentin which is formed.
3. ___ forms after eruption of a tooth and throughout life resulting in a
gradual but asymmetric reduction in pulp size.
4.___ is an irregular and disorganized layer of dentin laid down in response to any injurious/irritant stimuli.
1. Mantle dentin
2. Circumpulpal dentin
3. Secondary dentin
4. Tertiary dentin or reparative dentin
Primary function of the pulp:
Other function include:
1. dentin formation
2. induces enamel formation by forming dentin
3. dentinal tubules linked to pulp to maintain hydration and formation of peritubular dentin
Type I and Type III collagen is present in the pulp in a ratio of ___ %
1. 55 : 45%.
Odontoblasts synthesize type ____ collagen, while fibroblasts in the pulp synthesize .
1. Type I
2. both Type I and Il
The central zone or pulp proper contains large nerves and blood vessels. This specialized odontogenic area has three layers (from innermost
l. Cell rich zone: ___
2. Cell-free zone or zone of Weil:
3. Odontoblastic layer:
1. innermost pulp layer which contain fibroblasts.
2. is rich in both capillaries and nerve networks. The nerve plexus of Raschkow is located here.
3. contains odontoblasts and lies
next to the predentin and mature dentin.
Cells found in the dental pulp include (4):
1. Fibroblasts (the principal cell).
3. histiocytes (macrophages)
In diseased pulp, the following cells are present:
2. plasma cells,
6. mast cells (contain histantine and heparin).