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
Which of the following does NOT represent a fascial space for the spread of infection?
Superficial temporal space
Pterygomandibular space
Masseteric space
Rhinoseteric space
Submental space
Rhinoseteric
Which type of impacted teeth always involve bone removal and/or sectioning during surgical removal?
Horizontal impaction
Mesioangular or vertical may not require removal of bone or sectioning
Which of the following does NOT represent a possible finding of severe infection?
Trismus
Drooling
Difficult or painful swallowing
Swelling and induration with elevation of tongue
Temperature of 99F
E
All others refer to an airway emergency
How much bone loss around an implant is acceptable per year?
0.02mm a year is WNL
Implants should be placed at least ___mm away from the IA. If the implant is placed too close it should be backed up to ensure a safe distance from the nerve.
2mm
Name three systemic effects of obstructive sleep apnea syndrome.
Hypertension
Cor pulmonale
Cardiac arrhythmia
Which is the most severe classification of maxillary fracture?
Lefort 3
True or false… antibiotic use in cases of odontogenic infections…
B-lactam antibiotics are preferred
Bactericidal agents are preferred to bacteriostatic agents in immunocompromised pts
True
Select 3 from the following list, factors that make surgical removal of impacts thirds more difficult
Distoangular positioned 3rd molar
Mesioangular positioned third molar
Narrow PDL
Tooth roots are 1/2-1/3 formed
Close proximity to IA
Fused conical roots
A
C
E
Which of the following anesthetics is marketed for dentistry in the US in more than one concentration?
Mepivicaine (carbocaine)
Which anesthetic is packed in the highest concentration of all local anesthetics in Dentistry?
Articaine
Conservative surgical excision would be appropriate treatment and probably curative for which of the following?
Nodular fasciitis
Fibromatosis
Fibrosarcoma
Rhabdomyosarcoma
Adenoid cystic carcinoma
Nodular fasciitis
A 21 year old woman when to their dentist because of facial asymmetry. This asymmetry had developed gradually over 3 years. The pt had no symptoms. A diffusely opaque lesion was found in her right maxilla. Al laboratory tests were within normal limits. Biopsy reveals it as a fibro-osseous lesion. The pt most likely has ___
Fibrous dysplasia
A cutaneous maculopapulary rash of the head and neck preceded by small ulcers in the Buccal mucosa would suggest….
Rubeola
The idiopathic condition in which destructive inflammatory lesions featuring necrotizing vasculitis are seen in the lung, kidney, and upper respiratory tract is known as ____
Wegener’s granulomatosis
From the following list, select the systemic diseas in which patients may develop apthous ulcers… (3)
Celiac sprue Sarcoidosis Amyloidosis Behcet’s syndrome Crohn’s disease Neurofibromatosis
Celiac sprue
Behcet’s syndrome
Crohn’s disease
What is the function of the filament in radiology?
Release electrons
What is the photosensitive component of an x-ray film?
Silver halide crystals
If your film-based radiographs start coming out too light, it might mean that….
The developer needs changing
Approximately __% of adolescents have crowding severe enough to consider extraction of permanent teeth as part of treatment
15%
Children in the primary dentition most often present with [increased/decreased] overbite
Decreased
An adult pt with a class 2 molar relationship and a cephalometric ANB angle of 2 degrees has which type of malocclusion?
Class 2 dental malocclusion
What is the usual order of extraction of teeth if serial extraction is chosen as the treatment to alleviate severe crowding?
Primary canines
Primary first molars
Permanent first premolars
A 7 year old patient has a 4mm midline diastema. What should be done?
Take a radiograph to be certain there is not the presence of a supernumerary tooth
Reduction of overbite can be accomplished most readily by which tooth movement?
Intruding maxillary incisors
True or false.. the interproximal contacts of primary teeth are broader and flatter than the interporximal contacts of permanent teeth
True
Which is the most likely cause of pulpal necrosis after trauma to a tooth?
Pulpal hyperemia
Which type of orthodontic wire would be the BEST choice for a pt with a known nickel allergy?
Beta titanium
Which of the following is NOT a process in motivational interviewing?
Focusing
Analyzing
Evoking
Engaging
Planning
Analyzing
Which behavior change theory emphasizes the importance of self-efficacy and behavioral modeling and reinforcement?
Social cognitive theory
A pt is conflicted about wearing a night guard, despite your recommendations to prevent further damage from bruxism. The pt states “i have so much going on right now that i just dont think i am going to be able to wear it consistently like i should”. this is an example of…
Sustain talk
Fluoride supplementation for a 2 year old child who lives in a nonfluoridated community can best be accomplished by initially prescribing ___
Fluoride drops
Approximately ___% of the US population on public water supplies lives in a fluoridated community
74% (204 million)
An amalgam restoration is considered ___ prevention
Secondary
An ANB value > 2 indicates ____
An ANB value < 2 indicates ____
Class 2 skeletal
Class 3 skeletal
Increased monomer added to acrylic resin results in….
Increased shrinkage
What is the purpose of adjusting the occlusion in dentures?
To obtain even occlusal contacts
Which of the following may be a consequence of occlusal trauma on implants?
Widening of PDL
Soft tissue sore around tooth
Bone loss
All of the above
Bone loss
Name three cases where a diagnostic wax up is indicated
Reestablishing anterior guidance
A provisional fixed prosthesis is to be fabricated
Uncertainty exists regarding esthetics
What is the MOST important predictor of clinical success of a cast post and core?
Amount of remaining coronal tooth structure
A dentist is preparing all maxillary anterior teeth for crowns. Which procedure is necessary to preserve and restore anterior guidance?
Custom incisal guide table
The minor connector for a mandibular distal extension base should extend posteriorly about ____
Two thirds the length of the edentulous ridge
What is the best method for extracting teeth for an immediate denture?
Extract posterior teeth, leave the anterior
Wait a month for healing, construct the dentures, and extract the anterior teeth the day of deliver of the immediate dentures
Note that if this is done, the most difficult step is border molding before th final impression with existing teeth
