Exam II Practice Questions Flashcards
What causes pre-odontoblasts to line up along basal lamina?
Fibronectin
What is NOT found in the pulpal zone:
Parietal plexus
T/F Each nerve fiber gives 4 branches to Raschkow plexus. Most fibers are free unmyelinated nerve endings.
First statement false, second statement true
What is true about tomes 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 & exposed dentin:
Erosion
Ask if they eat acidic foods
Thick cementum on roots in radiographic image may indicate:
Hyper cements is
Image of cyst in gingiva may incdicate
Gingival cyst
What causes gingival cysts?
Rests of Serres
Where is the cementum thinnest?
CEJ
What fibers give fast sharp localized pain?
A-delta fibers
Sympathetic branches are from:
Superior cervical ganglion
What provides sensory afferent innervation?
Trigeminal nerve (CN 5)
T/F: Interradicular fibers only found in multirooted teeth. They keep adjacent teeth together:
Both true statements
T/F: Textbook question- Epithelial rests of Malassez found in PDL and their function in the PDL
No known function but it is believed they may play a role in cementogenesis
T/F: Peritubular dentin is less calcified that’s intertubular dentin:
False
Mature odontoblasts can make 2’ dentin. Damage to these cells causes subodontoblastic stem cells to differentiate & make 3’ dentin:
Both statements true
CASE STUDY: Patient Maxillilary CI is knocked out from baseball. You sanitize it and insert it back into alveolar bone. What reparative cell mechanism is most likely?
Alveolar bone secretes cells & fuses cementum to bone
(Severe injury —> Ankylosis)
What makes up biological width?
Junctional epithelium & GFL
CASE STUDY: Patient comes in after crown in placed & has inflamed gums. There is a 0.5mm distance. What do you tell them?
The biological width has been compromised
T/F: Raschkow’s plexus does NOT form before roots are completely developed
False
T/F: Presence of carbonate apatite core in enamel is more soluble to 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 fiber groups
Wound healing step:
Fibroblasts & osteoblasts replace damaged tissue
Which statement is false about lateral root canals (according to text)?
False there was no treatment option available
- The successful treatment of these endodontic-periodontics lesions is dependent on determining in which of the tissues the disease process originated
GCF Fluid goes through gingival epithelium, what could it be used for in the future?
Markers assist in identifying those who are most vulnerable to the spread of infection from gingivitis to periodontitis
Patient prevents 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 trauma, 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 & A-beta
T/F: Mesial movement of premolar during ortho treatment causes mesial compression & resorption of bone. Distal area has tension & exhibits bone deposition.
Both true
T/F: Dental pulp collagen is largest extracellular component making up 25-32%. Most prevalent is type I & III 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 & canaliculi. Lacunae house cell bodies whereas canaliculi provide communication and have cytoplasmic projections
Both true
Exposed cementum:
- Facilitated endotoxin absorption
- Faciliated attachment of plaque & calculus
- It is hypermineralized, which prevents the reabsorption of collagen
(All of the above)
What cranial nerve is the trigeminal nerve?
CN V
According to your text, what is a characteristic of the Vermillion Border?
Blood vessels close to surface
Remove boney thing from buccal surface of #3. You then drain blood from alveolar bone & 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 them at the DEJ.
Both false
Dentin matrix proteins:
-GLA Proteins
-Help mineralize hydroxyapatite
-Controlling size of hydroxyapatite crystals
(All of the above)
If you are given a lateral periodontal cyst, which one is false?
Treatment is NOT necessar & the cyst will resolve on its own (That’s 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
Odontoblast matrix vesicles contain all the following except:
Acid phosphatase
Growth factors secreted by inner enamel epithelium that play a role in odontoblast differentiation include all of the following EXCEPT:
PDFG
Include: TFF, BMP, IFG, FGF
The organic matrix of dentin includes all of the following components except for:
Except for: fibronectin & laminin
(It does include: Type I, III, V collagen, Proteoglycans & glycosaminoglycans, Sialoprotein, Sialophosphoprotein, Osteonectin & Osteopontin)
The organic matrix of dentin is deposited incrementally at a rate of _____ microns per 24 hours
4 to 8
Incremental lines of Von Ebner’s are thought to represent a hesitation in the matrix formation & subsequently altered mineralization that occurs every _____ days of matrix deposition
4 to 20
All of the following features found in dentin represent areas of hypomineralization EXCEPT:
Perikymata
(Hypomineralization areas include: Contour lines of Owen, Neonatal lines, Tome’s granular layer, Interglobular dentin)
Because of the decreasing volume of the pulp chamber the number of dentinal tubules per unit area at the surface is 40,000/mm^2 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 a tooth reaches functional occlusion is predominantly ____ dentin
Seconday
All of the following are features of sclerotic dentin EXCEPT:
Always occurs as a reparative response to pulpal injury
(Features of sclerotic dentin include: Hyperminearlized, 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: Prevoltella 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 & dendritic cell population of the dental pulp comprise ____ % of the total pulpal cell population
8%
Sympathetic nerves to the dental pulp are derived from the ___ ganglion
Superior cervical
Fast conducting nerve fibers from dental pulp have a diameter of 1-6 micrometers and are associated with sharp, located pain are termed _____ fibers
A-delta
All of the following neuropeptides have been identified in the dental pulp EXCEPT:
Seratonin
Majority of nerve axons located in intratubular dentin are:
??
In regards to pulpal blood vessels, all of the following are true EXCEPT:
Radicular 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 & macrophages and other inflammatory cells within connective tissue undergoing liquefactive necrosis
Abcess
Syncytial macrophages refers to:
Fusion of macrophages to form multinucleated giant cells
In the hierarchy of mineralized tissues (enamel, bone & dentin) cementum exhibits:
Least degree of mineralization
Cementum at the CEJ is approximately ____ microns thick
30-50 microns
An end-to-end junction of enamel and cementum has an incidence of occurrence of approximately:
30%
Cementicles are a response to all of the following EXCEPT:
Multiple restorations on same tooth
