Exam II Questions Flashcards
What causes pre-odontoblasts to line up along the basal lamina:
Fibronectin
What is NOT found in the pulpal zone?
Parietal plexus
T/F: Each fiber gives 4 branches to Raschkow’s Plexus. Most Fibers are free unmyelinated nerve endings:
First statement false, second statement true
What is true about Tome’s Granular Layer?
Interglobular dentin
T/F: Cementicles can be free, embedded, or attached. The number of them decreases with increasing age.
First statement true, second statement false
Clinical case with cupped occlusal surfaces, defects on lingual enamel and exposed dentin:
Erosion- ask if they eat acidic foods
Thick cementum on the root in radiograph:
Hypercementosis
Images of cyst in gingiva:
Gingival cyst
What causes gingival cysts?
Rests of Serres
Where is the cementum the thinnest?
CEJ
What fibers give rise to fast, sharp, localized pain?
A-Delta
Sympathetic branches are from:
Superior cervical ganglion
What nerve provides sensory afferent innervation?
Trigeminal nerve (CN5)
T/F: Interradicular fibers only found in multi-rooted teeth. They keep adjacent teeth together.
I THINK BOTH STATEMENTS TRUE???
T/F: Textbook question: Epithelial rests of malassez found in PDL and their function in PDL:
True- function unknown but may play a role in cementogenesis
Peritubular is less calcified than intertubular dentin:
False
Mature odontoblasts can make 2’ dentin. Damage to these cells causes subodontoblastic stem cells to differentiate and make 3’ dentin.
Both statements true
CASE STUDY: Patient maxillary CI is knocked out from baseball. You sanitize and insert the tooth back into the alveolar bone. What reparative cell mechanism is most likely?.
Alveolar bone secretes cells and fuses cementum to bone
Severe injury= ankylosis
What makes up biological width?
Junctional epithelium and GFL
Case Study: Patient comes in after crown is placed and has inflamed gums. There is a 0.5mm distance. What do you tell them?
The biological width has been compromised
T/F: Raschkows plexus does NOT form before the roots are completely developed:
FALSE
T/F: The presence of carbonate apatite core in enamel is more soluble than acid. Fluoride can replace hydroxyl ions and be less susceptible to acid dissolution.
Both true
Which fibers are responsible for resisting rotational forces?
All PDL fibers
Wound healing step:
Fibroblasts and osteoblasts replace damaged tissue
Which statement is false about lateral root canals?
False that there is not treatment options available
- The successful treatment of these endodontic-periodontics lesions is dependent on determining in which of teh tissues the disease process originated
GCF fluid goes through gingival epithelium. What could it be used for in the future?
Marker assist in identifying those who are most vulnerable to the spread of infection from ginigivitis to periodontitis
Patient presents to you with case. They complain of pain and you deduce that the tooth is mobile. What is accountable for this mobility?
Due to occlusal , resorption of alveolar bone parallel to the long axis of the tooth
How would a quick inflammatory response occur in the pulp horn?
Leakage through fenestrated capillaries
Schwann cells provide myelination for what axons?
A-delta and A-beta
T/F: Mesial movement of premolar during ortho treatment causes mesial compression and resorption of bone. Distal area has tension and exhibits bone deposition.
Both true
T/F: Dental pulp collagen is largest extracellular component making up 25-32%. Most prevalent is type 1 and 3 collagen.
First statement is true, second statement is false- because only type 3 is most prevalent in dental pulp
Sympathetics cause:
Vasoconstriction
There are two types of cementocytes, lacunae and canaliculi. Lacunae house cell bodies whereas canaliculi provide communication and have cytoplasmic projections:
Both true
Exposed cementum:
- Facilitates endotoxin absorption
- Facilitates attachment of plaque and calculus
- It is hypermineralized, which prevents the reabsorption of collagen
(ALL OF THE ABOVE)
What cranial nerve is the trigeminal nerve?
CN 5
According to your text, what is the characteristic of the vermillion border?
Blood vessels close to surface
Remove bones thing from buccal surface of #3. You then drain blood from alveolar bone and apply some sort of sheet over the area. This prevents what cells from healing the injury?
Epithelial cells
T/F: Cementum differentiated by dental matrix growth factors. Can be reached through fenestration of Hertwig’s sheath.
True?
T/F: Dentinogenesis imperfecta is characterized by bluish-grey teeth. Enamel is affected just like dentin.
First statement true, second statement false
T/F: Tertiary dentin is released immediately in response to outside forces. It is laid down in a clean fashion.
First statement is true, second statement is false
T/F: Dentin tubules have a bigger diameter at DEJ. There are more of the at the DEJ.
Both statements false
Dentin matrix proteins:
- GLA proteins
- Help mineralize hydroxyapatite
- controlling size of hydroxyapatite crystal
(ALL OF THE ABOVE)
If you are given a lateral periodontal cyst, which one is false?
Treatment is not necessary and the cyst will resolve on its own (thats false)
The stimulus for ectomesenchymal cell differentiation into pre-odontoblasts appears to be derived from ______ located within the basal lamina of the inner enamel epithelium.
Fibronectin
Odontoblasts matrix vesicles contains all of the following except:
Acidphosphatase
Growth factors secreted by inner enamel epithelium that play a role in the odontoblasts differentiation include all of the following except:
EXCEPT PDGF
(Includes: TGF, BMP, IGF, FGF)
The organic matrix of dentin includes all of the following components except for:
Except for: fibronectin and laminin
(It does include: Type 1, 3, and 5 collagen, proteoglycans and glycosaminoglycans, sialoprotein, and sialophosphoproteins, osteonectin and osteopontin)
The organic matrix of dentin is deposited incrementally at a rate of ___ microns per 24 hrs.
4 to 8
Incremental lines of von Ebner are thought to represent a hesitation in the matrix formation and subsequently altered mineralization that occurs every _____ days of matrix deposition
4-20
All of the following features found in dentin represent areas of hypomineralization except:
Perikymata
(Hypmineralization areas include: contour lines of owen, Neonatal lines, Tome’s granular layer, and interglobular dentin)
because of the decreasing volume of the decreasing volume of the pulp chamber, the number of definitional tubules per unit area at the surface is 40,000/mm2 and about _____ that number of the DEJ
1/2
Which of the following features of dentin is found ONLY in the root?
Tome’s Granular Layer
Dentin formed after tooth reaches functional occlusion is predominantly _____ dentin.
Secondary
All of the following are features of sclerotic dentin except:
EXCEPT: always occurs as a reparative response to pulpal injury
(Features of sclerotic dentin include: hypermineralized, does not contain tubules, may form in response to dental caries, increase incidence with increasing age)
All of the following are features of dentinogenesis imperfecta EXCEPT:
EXCEPT: short or blunted roots
All of the following bacteria may produce dental caries except:
Except for: prevotella intermedia
All of the following are causes of dental sensitivity except:
Dehydration from mouth breathing
The theory most commonly considered to best explain dentinal sensitivity is the _____ theory:
Brannstrom Hydrodynamic theory
According to the textbook, the yellowish color of teeth that occurs with increasing age is due to:
Increase in the presence of sclerotic dentin
According to the text, the dentinal “smear layer” is a result of _____.
Instrumentation
The odontogenic zone of the dental pulp consists of all the following cell layers except:
Parasympathetic neural zone
The reparative function of dental pulp is closely related to the formation of:
Tertiary dentin
The macrophages and dendritic cell population of the dental pulp comprise ____% of the total pulpal cell population
8 %
Sympathetic nerves to the dental pulp are r derived from the ____ ganglion
Superior cervical
Fast conduction nerve fibers found in the dental pulp that have a diameter of 1 to 6 micrometers and are associated with shaft, localized pain and termed ____ fibers
A-delta
All of the following neuropeptides have been identified in the dental pulp except:
Serotonin
The majority of nerve axons located in intratubular dentin are:
….
In regards to pulpal blood vessels, all of the following are true except:
Redicular pulp exhibits the greatest density of capillary loops
False denticles (pulp stones) are characterized by all of the following except:
…
A dense aggregation of neutrophils and macrophages and other inflammatory cells within connective tissue undergoing liquetfactive necrosis:
Abscess
Syncytial macrophages refers to:
Fusion of macrophages to form multinucleated giant cells
In the hierarchy of mineralized tissue (Enamel, bone and dentin), cementum exhibits:
least degree of mineralization
Cementum at the CEJ is approximately _____ microns thick
30-50
An end-to-end jucntion of enamel and cementum has an incidence of occurrence of approximately ____%
30
Cementicles are a response to all of the following with:
Multiple restorations in the same tooth over time
