It's all about Growth and Development
What is the histological landmark on primary teeth consisting of altered arrangement of the enamel prisms that occurs as a result of the transition from the intrauterine to the extrauterine environment?
a) Interglobular dentin
b) Line of Retzius
c) Dental Lamina
d) Hertwig's epithelial root sheath
b)
According to Houpt et al., what percent of teeth restored with preventive resin restorations remain caries free after 9 years?
a) 88
b) 78
c) 58
d) 28
88
caries in 25% of teeth that lost sealant, 88% restored teeth remained caries free for 9 years
What is the most common dental trauma in primary teeth?
a) luxation
b) intrusion
c) root fracture
d) avulsion
a
permanent teeth --> crown fx
The first sense to develop is:
a) touch
b)hearing
c) sight
d) taste
a - touch (around 8 weeks)
touch --> taste --> smell --> hear --> eyesight
Most cases of cementoblastomas involve the ....
a) Max first molar
b) Max second molar
c) Mand first molar
d) Mand second molar
c
Rare benign odontogenic tumor
Second and third decade of life
well circumscribed radiopaque mass
tooth remains vital
If there is 0 mm of interdental spacing in the deciduous dentition, what is the likelihood of crowding in the permanent dentition?
a) 0%
b) 50%
c) 66%
d) 100%
c)
crowded primary dentition --> 100% crowding in permanent dentition
no spacing --> 66%
3mm or less spacing --> 50%
3-5 mm of spacing --> 20%
6mm or more spacing --> 0%
a) 5000 ppm fluoride
b) 25 mg fluoride
c) 5% sodium fluoride
d) 1% stannous fluoride
c - 5% NaF
5% NaF --> 22,600 ppm fluoride
A traumatic injury to the chin increases the likelihood of ...
a) mandibular alveolar fracture
b) maxillary alveolar fracture
c) molar tooth fracture
d) subcondylar/condylar fracture
d - most condylar fractures due to blunt trauma to anterior mandible
What reading is displayed on a portable nitrous oxide cylinder than is 1/2 empty?
a) 375 psi
b) 750 psi
c) 1000 psi
d) 2000 psi
b
oxygen - start at 2000 and depleted based on amount used
nitrous - start 750, read 750 until empty
What syndrome is associated with over-retained primary teeth:
a) Down Syndrome
b) Ectodermal Dysplasia
c) Hyper IgE Syndrome
d) Papillon Lefevre
c Hyper IgE
--> immunodeficiency syndrome
--> eczematous dermatitis
--> repeated fractures
--> retained primary teeth
Complete bilateral cleft palate is due to failure of fusion of the
a) Palatine processes
b) Palatine and frontonasal processes
c) Palatine, frontonasal and secondary nasal processes
d) Palatine, frontonasal, secondary nasal processes and mandibular processes
c - primary palate derived from frontonasal process, palatine processes that form secondary palate arise from maxillary processes, these must fuse with each other and the primary palate. palatine process must also fuse with secondary nasal processes which are also derived from maxillary processes
How many carbons in xylitol?
a) 4
b) 5
c) 6
d) 7
5 carbons
xylitol inhibits growth of microorganisms present in plaque and saliva after it accumulates intracellularly into the microorganism
The TEN4 mnemonic refers to
a) bruises to torso, ears and neck in children under 4
b) common signs of skull fracture in young children
c) injuries that are common and unlikely to be from abuse
d) torn frenum, black eye, and neck rash that lasts for 4 days
a
Analgesic effect of nitrous oxide is the result of the activation of :
a) alveolar gradient
b) benzodiazepine binding site
c) NMDA receptors
d) opioid receptors
d
Which condition may manifest with "floating teeth"?
a) congenital epulis
b) leukemia
c) melanocytic neuroectodermal tumor of infancy
d) impetigo
c
benign neoplasm
non ulcerated, sessile, lobulated appearance
sudden onset and rapid growth, can displace teeth
high recurrence
usually less than 1 year of age
The palatine processes begin to fuse at
a) 6 weeks post fertilization
b) 8 weeks post fertilization
c) 10 weeks post fertilization
d) 12 weeks post fertilization
c) 10 weeks
maxillary arches develop at 6 weeks from which palatine process develops, processes elevate at 8 weeks, begin to fuse at 10 weeks, fusion usually complete by 12 weeks
What is the certainly lethal dose of fluoride?
a) 5 mg/kg
b) 15 mg/kg
c) 40 mg/kg
d) 50 mg/kg
b
acute toxic dose 5-8 mg/kg --> usually presents as gastric disturbances, tetany, hypotension, bronchospasm, fixed/dilated pupils, hyperkalemia --> ventricular arrhythmias and cardiac arrest
A 10 year old patient presents with an uncomplicated fracture on #8 and #9 with lip laceration. Correct exposure time for soft tissue film is:
a) normal exposure
b) 75% of normal exposure
c) 50% of normal exposure
d) 25% of normal exposure
d - soft tissue radiographs --> 25%
The "A not B" error was first described by:
a) Skinner
b) Bandura
c) Freud
d) Piaget
Piaget
A not B error = perseverative error - error in mental perception of objects seen in infants before age 1. objects that are hidden still exist - usually figure this out around 8 months
A radiographic stepladder pattern of residual bone trabecular has classically been described in which of the following lesions?
a) ameloblastoma
b) calcifying epithelial odontogenic tumor
c) odontogenic myxoma
d) adenomatoid odontogenic tumor
c
odontogenic myxoma:
- benign but locally aggressive
- slow growing, painless, expansile
- usually in mandible
usually multilocular with well developed lobules
At what age is mandibular arch length the greatest?
a) 4 yrs
b) 8 yrs
c) 12 yrs
d)16 yrs
a) 4 yrs
generalized spacing, no early or late mesial shifts
The recommended level of vitamin D supplementation for infants under 12 months ?
a) 10 IU/d
b) 400 IU/d
c) 600 IU/d
d) none unless signs of Ricketts
b)
less than 12 months -- 400
12-24 months - 600
If a primary tooth is intruded buccally, the apical tip ____ be seen radiographically and tooth appears _____.
a) can, longer
b) can, shorter
c) can't, longer
d) can't, shorter
b
Fear of separation peaks at what age?
a) 6-8 months
b) 13-18 months
c) 24-49 months
d) 32-38 months
b
Where do metastatic carcinomas of the jaw bones typically originate?
a) esophagus, breast, prostate, stomach, kidney and liver
b)breast, lung, thyroid, colon, kidney, prostate
c) esophagus, lung, liver, spleen, pancreas and bladder
d) bladder, breast, esophagus, lung, liver, pancreas
b