NBDE PART 1 - DENTAL ANATOMY EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS LATEST DOWNLOAD 2024/2025
BEST RATED TO SCORE A+ FOR PASS
What Occurs in the Mixed Dentition Period - CORRECT ANSWERS *Mixed
Dentition* = 6 years - 12 years
*a) Age 6*
- Get Mand. Molars at age 6
- By 6 have 20 primary and 4 permanent M1s
*b) Age 7*
- Have 18 primary and 6 permanent (4 perm molars, 2 mand. perm central
incisors)
*c) Age 8*
- 12 primary + 12 permanent
- Have Permanent M1s, central & lateral incisors, primary canines & molars
- Permanent Max. M1 have no distal contact yet
*d) Age 9*
- 12 Primary teeth remain in the mouth (primary canine and 2 molars per
quadrant x4)
*e) Age 10*
- Perm. teeth expected are central & lateral incisors, first premolars, M1s and
Mand. Canine
- Expect root of Perm M1 to be finished forming and calcifying (2-3 years after
eruption)
What are the 3 Cardinal Eruption Rules - CORRECT ANSWERS 1. Girls teeth
erupt BEFORE Boys
2. Mandibular erupt BEFORE Maxillary
3. Teeth of slender kids erupt BEFORE fat kids (too much tissue)
,NBDE PART 1 - DENTAL ANATOMY EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS LATEST DOWNLOAD 2024/2025
BEST RATED TO SCORE A+ FOR PASS
What are the Characteristics of Eruption? - CORRECT ANSWERS Eruption
1. The movement of tooth through the gums so that the clinical crown slowly
gets longer
- NOT exfoliation
2. Permanent teeth begin to form at 4 months in utero (Mand. M1)
3. First succedaneous to erupt is the Mand. Central incisors at 6-7 yr old
- NOT Mand. M1
4. Follicles of developing permanent incisors are in a position *lingual* to the
deciduous roots
- When a tooth is partially resorbed by the developing tooth underneath it, the
FACIAL part of the tooth is the longest and more securely attached to the
gingiva
- First evidence of root resorption on a primary incisor is seen on the *lingual*
root surface
What are the Calcification Times? - CORRECT ANSWERS 1. *Permanent Max
and Mand. M1s* begin to calcify *at birth*
- Begin to form at *4 months* in utero
2. Initiation of calcification for mandibular central incisors is 3-4 months
3. Permanent M3s begin to calcify at *8-10 yrs of age*
Primary Calcification Timeline in utero
1. Central incisors - 14 weeks
2. Lateral incisors - 16 weeks
,NBDE PART 1 - DENTAL ANATOMY EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS LATEST DOWNLOAD 2024/2025
BEST RATED TO SCORE A+ FOR PASS
3. Canines - 17 weeks
4. 1st Molar - 15.5 weeks
5. Lower 2nd molar - 18 weeks
6. Upper 2nd molar - 19 weeks
Permanent Initial Calcification
1. Both 1st molars at birth
2. Both central incisors: 3-4 months
3. Mandibular lateral: 3-4 months
- Maxillary lateral: 10-12 months
4. Both canines: 4-5 months
5. Both 1st premolars: 1.5-2 years
6. Both 2nd premolars: 2-2.5 years
7. Both 2nd molars: 2.5-3 years
8. Maxillary 3rd molar: 7-9 years
- Mandibular 3rd molar: 8-10 years
What is the Developmental Time for Teeth Formation? - CORRECT ANSWERS 1.
Entire primary dentition initiated between *6-8 weeks* embryonic
develolpment
2. Succedaneous permanent teeth initiate between *5 month (20th week) in
utero and 10th month after birth*
3. Permanent molars between *5 month (20 week) in utero (first molar) and
5th year of life (3rd molar)*
, NBDE PART 1 - DENTAL ANATOMY EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS LATEST DOWNLOAD 2024/2025
BEST RATED TO SCORE A+ FOR PASS
Quiz Questions of Eruptions - CORRECT ANSWERS 1. What are the Last
Permanent Incisors to Erupt?
- *Max Laterals*
2. The Earliest Age by which the roots of the Max. PM1 are completely formed
is?
- *12-13 years (2-3 years after eruption)*
3. In permanent dentition, the first teeth to begin calcification are the...?
- *Mand. M1s*
4. Permanent M3s begin to calcify at what age range?
- *8-10 ys of age*
5. How many teeth would a 6 year old have?
- *24 (20 deciduous + 4 M1s)*
6. At what age are the M3s fully erupted with a complete root structure?
- *26-27 (2-3 years after eruption)*
What is the Sequence for Primary Teeth Eruption? - CORRECT ANSWERS - 90%
are primary, 10% are supernumerary
- *Front before back* except *canine*
- *Lowers before uppers*, except *lateral* and *canine*
What are the Sequence of Permanent Teeth Eruption? - CORRECT ANSWERS -
*Mandibular teeth* erupt *before maxillary* counterpart
- *1st molars* are *first permanent* to erupt
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