1. HMD 102))
I-Choose the correct answer:
1-Cusp of Carabelli is found in:
A-Upper first permanent molar
B-Upper second permanent molar
C –Upper first deciduous molar D- Lower first permanent molar
2- The geometric outline of the occlusal surface of lower 6 is:
A- Square
B- Pentagonal
C- Trapezoid
D- Heart shape
3- The mesiobuccal cervical ridge is well developed in:
A-First deciduous molars
B-First permanent molars
C- Second premolars
D- First premolars
4- Which tooth has 4 fossae?
A- Lower third molar
B- Upper first permanent molar
C- Lower permanent second molar D- Lower first permanent molar
5- The tooth resembles the upper E is:
A- upper First permanent molar B- Upper Second permanent molar
C-First lower permanent molar
D- Third molar
6- The oblique ridge in upper permanent molars passing from:
A-Mesiobuccal& distolingaul cusp
B- Mesiolingual& distobuccal cusp
C- Mesiobuccal & mesiolingual cusp
D- Distobuccal & distolingual cusp
7- The upper 8 differes from the upper 6 in that they:
A- Has more supplemental grooves B: Has no distal contact area
C-Has abnormal root shapes
D- All of the above
8-Which premolar has mesiolingual developmental groove?
A- Upper first premolar
B- Upper second premolar
first premolar
D- Lower second premolar
C- Lower

2. 9-The curve of dental arch which is seen in coronal plane is:
A- Curve of Spee
B- Parabolic curve
C- Bonwill triangle
D- Curve of Wilson
10-Key of occlusion is:
A- Upper first permanent molar B-Upper second permanent molar
C- First upper pre molar
D- Lower second permanent molar
( 5 degrees)
II- Complete the following:
1-The different shapes of the occlusal surfaces of the permanent upper second molar are ………
&………
2-The dates of eruption of the lower premolars are …………..&……………
3-From the proximal aspect the line bisecting the root of the lower first premolars end in the
crown at the……..
4-The name of fossae found on the occlusal surface of the lower 5 three cusp types
are…………………………………………………..
5- The mesial slope of the buccal cusp in upper 4 is………………than
the distal one.
6- The shape of the developmental groove of lower 7 is……… ……
7- The different shapes of the developmental groove of lower 5 are…
8- The canine fossa is located at the ……………..surface of………….
9- The fault pit usually is located on the ………………surface of upper 6 and on
the……………………..surface of lower 6.
10-The mesial marginal developmental groove is found on the
mesial surface of ……………….
( 10 degrees)
IV- Answer the following by Yes or No (if the answer is no, mention the correct answer)

3. 1-The lower E has 4 cusps .
2- The mesiolingual cusp of upper 6 is related to acute angle. 3-The upper 5 has oval occlusal
aspect.
4-Cusp of Carabelli is considered as true cusp.
5-The 4 cusps of lower 7 has the same size.
6-The upper first permanent molar usually has three roots.
7-The upper second permanent molar may have cusp of Carabelli.
8-The lower 7 has cruciform developmental groove .
9-The mesiolingual cusp of upper permanent first molar is the largest cusp.
10- The roots of deciduous molars are more converged than in the permanent one.
(10 degrees)
V- Give full account on: (illustrate your answer by drawing)
1- The occlusal surface of the lower 6.
2- The parabolic curve.
(5 degrees)
Oral Sheet
III- Mention the following:
1- Elevations on the occlusal surface of upper first permanent molar
2-The geometric occlusal outline of the lower second premolar
3- The names of the roots of lower 6
4- The upper 6 is considered as key of occlusion (give 3 reasons).
5- The definition 0f centric occlusion.
6-The dates of eruption& root completion of permanent molars.

4. 7- Three differences between permanent & deciduous molars roots.
8- The name of the root canals of lower 6
9- The size of the cusps of the permanent lower first molar arranged in a descending order .
10-The difference between overbite &overjet.
(10 degrees)
Answer of Trial Final Exam. of Human Dentition
HMD 201
Choose the correct answer:
1---A
2---D
3---A
4---B
5---A
6---B
7---D
8---D
9---D
10---A
II- Complete the following:
1-The shapes of the occlusal surfaces of the lower second premolar are rounded & square
2-The dates of eruption of the lower pre molars are lower 4: 9-10 y&
lower 5: 10-11y
3-The line bisecting the root of the lower first premolars end in the crown at the buccal cusp tip.
4-The fossae found on the occlusal surface of the lower5 three cusp types are mesial&distal
triangular fossae
5- The mesial slope of the buccal cusp in upper 4 is longer than the distal one
III- Answer the following by Yes or No (if the answer is no, mention the correct answer)
1--The lower 6 has 5 cusps .
2-In centric occlusion the upper 6 is related to lower 6&7.
3-The overjet is the horizontal distance between the upper & lower teeth.
4-The mesiolingual cusp of upper 6 is the large

5. 5-The upper 4 has hexagonal occlusal aspect .
6-The upper first permanent molar usually has three roots.
7-The upper second permanent molar may have not cusp of Carabelli.
8-The lower 7 has cruciform developmental groove .
9-The mesiolingual cusp of upper permanent first molar is the largest cusp.
10- The roots of deciduous molars are more diverged than in the permanent one.
.
IV- Give full account on: (illustrate your answer by drawing)
1- The occlusal surface of the lower 6.
The occlusal surface is pentagonal in shape:
1-The buccal surface has 2 sides ,the mesiobuccal and distobuccal cusps form one side and
distal cusp form the second side.
2-The mesial,distal and lingual surfaces form the three sides.
The mesiodistal dimension is greater than buccolingual one.
The distal surface is narrower than the mesial surface.
The lingual surface is narrower than the buccal surface.
Elevations:
- Cusps: Has 5 cups listed from largest to smallest are:
mesiobuccal-distobuccal and
mesiolingual –distolingual-
distal cusps.
- Mesial marginal ridge(MMR) is higher and broader than the distal marginal ridge (DMR).
-Fossae:
1- Mesial triangular fossa (MTF)

6. 2-Distal triangular fossa (DTF)
3- Central fossa (CF)
-Developmental grooves (DG):
1- Central DG extend from the MTF to the CF to the DTF.
2- Mesiobuccal DG 3- Distobuccal DG
4-Lingual DG
-Pits :
1- Developmental pits at the bottom of the developmental fossae.
2-False pits at the end of the mesiobuccal and lingual developmental grooves.
2- The parabolic curve.
-The upper & lower dental arch have a horseshoe shape .
-The upper dental arch is somewhat larger than the lower dental arch
- The two dental arches conform to parabolic curves.
- The parabolic curve consists of three segments. A-The anterior segment : is semicircular curve
passing along the facial surfaces of the anterior teeth and mesial part of the first premolar.
B-The middle segment: is a straight line and passing along the buccal surfaces of the distal part
of the first & second premolars and mesial part of the first permanent molars. It is deviated
slightly buccally
C-The posterior segment is a straight line and passing along the buccal surfaces of the distal part
of the first, molar, second & third molars. It is parallel to the median line . 1- Elevations on the
occlusal surface of upper first permanent molar
Mesial& distal marginal ridges , oblique ridge and triangular ridge for each cusp.
Oral Sheet
(10 degrees)
III- Mention the following:
1- Elevations on the occlusal surface of upper first permanent molar:
-Triangular ridges on the mesiolingual, mesiobuccal, distobuccal,distolingual cusps.
-Mesial&distal marginal ridges

7. -Oblique ridge& cusp of Carabelli
2-The shape of the developmental groove of the lower second premolar are U, H , Y.
3- The names of the 3 roots of upper 6 are
Mesiobuccal,distobuccals and palatal roots
4- The upper 6 is considered as key of occlusion ( give 3 reasones) .
The largest tooth in the oral cavity.
The first permanent tooth to be erupted.
It is guided by the deciduous set .
5-The definition 0f centric occlusion: It is the máximum intercuspation of the upper& lower
teeth when the condyle is resting in most retrusive position.
6-The dates of eruption& root completion of permanent molars.
Upper& lower 6: 6 y& 9 Y—upper& lower 7 : 12 Y& 15Y
Upper& lower 8 : 18 Y & 21 Y
7- Three differences between permanent & deciduous molars roots.
8- The name of the root canals of lower 6
Mesiobuccal, mesiolingual, distal root canals.
9- The size of the cusps of the permanent lower first molar arranged in a descending order .
Mesiolingual, distolinbuccal, distal cuspsgual, mesiobuccal, disto.
10-The difference between overbite &overjet.
Overbite-----vertical distances
overjet-------horizontal distan
of overlopping of upper&lower teeth