Mosby's Practice Questions Flashcards
Which of the following statements regarding external resorption is NOT true?
It is a destructive process initiated in the periodontium
There are 3 main types: inflammatory root resorption, replacement resorption, and cervical resorption.
It can be located anywhere along the root canal
The margins are sharp, smooth, and well-defined
The margins are sharp, smooth and well defined
The major objectives of access preparation include all of the following except one. Which one?
Attainment of direct straight line access to canal orifices
Confirmation of clinical diagnosis
Conservation of tooth structure
Attainment of direct straight line access to the apical root
Confirmation of clinical diagnosis
Prolonged, unprovoked night pain suggests which of the following conditions of the pulp?
Pulpal necrosis
Mild hyperemia
Reversible pulpitis
Periodontal abscess
Pulpal necrosis
Even in degrading pulps, C fibers can still be active. They are less affected by disrupted blood flow that A delta fibers
In a tooth with a primary periodontal lesion with secondary endodontic involvements, proceed first with…
Periodontal treatment
Nonsurgical endodontic treatment
Antibiotic treatment
Incision and drainage
Nonsurgical endodontic treatment
True endo-perio lesions are always treated as primary endo lesions. Endo is treated first followed by perio
In which of the following conditions is elective root canal therapy contraindicated?
AIDS
Recent MI
Leukemia
Radiotherapy
Recent MI
No anesthetic should be given to a pt with a recent MI until at least 6 months have passed since the event.
Endodontic infection usually is polymicrobial. What is the predominant type of microorganism found in a tooth that requires endodontic therapy?
Aerobic bacteria
Facultative bacteria
Obligate anaerobic bacteria
Yeast microorganisms
Obligate anaerobic bacteria
On routine radiographic survey of a new pt, you notice a circle-shaped radiolucency midroot and over the pulpal outline of tooth #6. After a vital response to cold-testing, your diagnosis and subsequent treatment plan are….
Internal resorption
Prompt Completion of nonsurgical endodontic treatment
(If not treated, it may or may not reach the external tooth surface)
During a nonvital bleaching procedure, if a barrier material is not placed between the root canal filling and bleaching material, the tooth can be subjected to ___
External cervical resorption
4mm of filling material between root fillings and internal bleaching material is required
When are antibiotics indicated in endodontics?
Diffuse swelling (cellulitis) (note that fluctuant swelling is not an indication)
Fever
Malaise
The bacterial flor of an infected previously treated endodontic tooth is best characterized as gram ___ and ___
Gram positive facultative anaerobes (best example is E. faecalis)
What is the proper treatment protocol for a NaOCl accident?
Instructions to minimize swelling with the use of cold compresses within the first 24 hours
Analgesics for pain control
Antibiotics for pts at increased risk for secondary infection
Which is the most likely to cause pulp necrosis?
Subluxation
Extrusion
Avulsion
Concussion
Avulsion
Features of focal sclerosing osteomyelitis often include…
Non vital pulp test
Hx of recent restoration of the tooth inquestion
A radiolucent lesion, which in time becomes radiopaque
None of the above are true
Hx of recent restoration of the tooth in question
Condensing osteitis is typically found in young pts (<20years) in mandibular molars. Tooth may or may not be vital. It is typically due to a chronic low grade inflammation
Once the root canal is obturated, what usually happens to the organisms that had previously entered the periradicaulr tissues from the canal?
They are eliminated by the natural defenses of the body
Obturation prevents coronal leakage so the bacteria lose source of nutrition which makes them susceptible to the body’s immune response
Describe the number system for dental hand instruments (4 digits)
1 = blade width
2 = cutting edge angle
3 = length of blade
4 = blade angle
In a conventional class 1 composite prep, in what two ways is retention obtained?
Occlusal convergence
Bonding
True or false… fracture lines should be included in a prep
True
Which of the following statements about an amalgam tooth/cavity prep is true?
Enamel cavosurface margin must be 90 degrees
The cavosurface margin should provide for a 90 degree amalgam margin
All prepped walls converge externally
Reteinon form for class V preps can be placed at the DEJ
The cavosurface margin should provide a 90 degree amalgam margin
Enamel doesn’t necessarily have to have a 90 degree cavosurface margin, but amalgam does for strength of material
Causes of post-op sensitivity with amalgam restoration include all of the following except one. Which one is the exception?
Lack of adequate condensation, especially lateral condensation in the proximal boxes
Voids
Extension onto the root surface
Lack of dentinal sealing
Extension onto the root surface
Describe the setting reaction of dental amalgam
Mercury reaction with silver on or in the alloy particle
Major differences between etch-and-rinse and self-etching primer adhesive systems include all of the following except which one?
Time necessary to apply the materials
Amount of smear layer removed
Bond strengths to enamel
Need for wet bonding
Time necessary to apply the materials
Self etch removes less smear layer thus creating a weaker bond yet reducing leakage because smear layer obliterates the dentinal tubules
Self etch should be applied in multiple coats so the time to apply it is similar to etch and rinse
All of the following statements about slot-retained complex amalgams are true except one. Which one?
Slots should be at least 1.5mm in depth
Slots should be 1mm or more in length
Slots may be segmented or continuous
Slots should be placed at least 0.5mm inside the DEJ
D
This is false because slots should be placed 1mm deep into the DEJ - should be prepped with an inverted cone bur
The longer the slot the better
Which of the following has the highest linear coefficient of thermal expansion?
Amalgam
Direct gold
Tooth structure
Composite resin
Composite resin
It is 2.5-3 times greater than tooth structure
What is the function of skirts and collars in gold onlays?
Skirts = increase retention and resistance forms
Collars = provide bracing
