Quiz 4 Review

Question 1

Mandibular First Molar: (Facial) The cuspal ridges of the mesiofacial cusp meet at what angle?

Answer 1

At an angle that is almost flat

Question 2

Mandibular First Molar: (Facial) The distofacial cusp has cuspal ridges that give rise to what?

Answer 2

To a more pointed cusp tip than the mesiofacial cusp, but the cusp tip is still rounded

Question 3

Mandibular First Molar: (Facial) What cusp comprises a very small part of the total mesiodistal width of the facial surface? Why?

Answer 3

Distal cusp

- Because most of the cusp is lingual to the distofacial line angle placing it on the distal aspect of the tooth

Question 4

Mandibular First Molar: (Facial) Which cusp is the most pointed from this view?

Answer 4

The distal cusp is more pointed than either the mesiofacial or distofacial cusp

Question 5

Mandibular First Molar: (Facial) Which groove is shorter from the facial aspect? This shorter groove terminates where and how?

Answer 5

Mesiofacial groove is shorter than the distofacial groove and extends from the occlusal margin of the facial surface and terminates about half way to the cervical line, ending in a slight depression that extends laterally from the terminus of the groove

Question 6

Mandibular First Molar: (Facial) The mesiofacial groove has what at its terminus?

Answer 6

A pit or depression that extends laterally and commonly requires restoration that is termed a “facial” or “buccal” pit

Question 7

Mandibular First Molar: (Facial) The root trunk from the facial aspect measures what on average?

Answer 7

3.0 mm

Question 8

Mandibular First Molar: On which aspect is there a deep depression between the roots? What is the overall makeup and shape of this depression?

Answer 8

There is a deep depression between the roots on the facial aspect that becomes progressively more shallow as it extends occlusally from the bifurcation to the cervical line, but does not cross the cervical line.

Question 9

Mandibular First Molar: (Facial) T or F, the roots of the mandibular first molar are usually longer and more divergent than those of the mandibular second molar only

Answer 9

False, longer and more divergent than those of the mandibular second or third molar

Question 10

Mandibular First Molar: (Lingual) The cervical line is positioned approximately what measurement higher or lower on the lingual surface than on the facial surface?

Answer 10

1.0 mm higher on the lingual surface than on the facial surface

Question 11

Mandibular First Molar: (Lingual) The root trunk measurement will be what measurement from cervical line to bifurcation on the lingual aspect of the tooth?

Answer 11

1.0 mm longer (average 4.0 mm total)

Question 12

Mandibular First Molar: (Lingual) When measured on the lingual, the total root length is greater or less and why?

Answer 12

Greater because the roots are measured from the cervical line to the apex.

Question 13

Mandibular First Molar: (Mesial) Mesial crown outline is what shape?

Answer 13

Rhomboidal shaped

Question 14

Mandibular First Molar: (Mesial) The greatest curvature of the facial outline is at what portion of the crown?

Answer 14

At the cervical third of the crown and is termed the cervical ridge.

Question 15

Mandibular First Molar: (Mesial) The cervical ridge crest is lower or higher occlusally when compared to the cervical ridges found on maxillary molars but is still in the cervical third

Answer 15

Higher

Question 16

Mandibular First Molar: (Mesial) The angulation of the triangular ridge of the mesiolingual cusp is approximately what degrees in relation to the mesial marginal ridge

Answer 16

30 degrees

Question 17

Mandibular First Molar: (Mesial) Which cusps are taller? Mesial or Distal?

Answer 17

Mesial cusps are taller

Question 18

Mandibular First Molar: (Mesial) Since the mesial cusps are taller than the distal cusps on the tooth, very little of what surface can be viewed?

Answer 18

Very little of the occlusal surface can be viewed

Question 19

Mandibular First Molar: (Distal) The facial outline of the distal cusp is located where?

Answer 19

Lingual to the facial outline of the taller distofacial cusp with the entire distal cusp superimposed onto the distofacial cusp

Question 20

Mandibular First Molar: (Distal) T or F, The distal cusp exclusively comprises the distal contact area, which is also slightly lingual to the faciolingual vertical bisector of the crown?

Answer 20

False, it is slightly facial to the faciolingual vertical bisector of the crown.

Question 21

Mandibular First Molar: (Distal) T or F, The distal cusp exclusively comprises the distofacial contact area, which is also slightly facial to the faciolingual vertical bisector of the crown?

Answer 21

False, The distal cusp exclusively comprises the distal contact area

Question 22

Mandibular First Molar: (Distal) Both the distal and the distofacial cusp tips are facial or lingual to the apices of the mesial and distal roots?

Answer 22

Facial to the apices of the mesial and distal roots

Question 23

Mandibular First Molar: (Occlusal) Which cusp is most facially placed? Which cusp is most mesially placed cusp on the tooth?

Answer 23

• Distofacial cusp is most facially placed

- Mesiolingual cusp is most mesially placed

Question 24

Mandibular First Molar: (Occlusal) The cusp sizes from largest to smallest?

Answer 24

1. Mesiofacial
2. Mesiolingual
3. Distolingual
4. Distofacial
5. Distal cusp

Question 25

Mandibular Second Molar: (Facial) Is there a facial groove? What cusps does it divide? What portion of the crown does it And how does the groove end?

Answer 25

yes, There is one facial groove, called the facial (or buccal) groove and it divides the mesiofacial and distofacial cusps, ending in a distinct facial (buccal) pit in the middle third of the crown

Question 26

Mandibular Second Molar: (Facial) T or F, The facial groove is completely vertical

Answer 26

False, it is vertical, except for a slight mesial inclination at the facial pit

Question 27

Mandibular Second Molar: (Facial) T or F, The facial groove is located slightly distal to the vertical line dividing the crown in half, mesiodistally

Answer 27

True

Question 28

Mandibular Second Molar: (Mesial) The tip of the mesiofacial cusp is closer to what axis bisector of the tooth?

Answer 28

Closer to the vertical faciolingual axis bisector rather than to the greatest facial outline of the crown

Question 29

Mandibular Second Molar: (Occlusal) Are the tips of both facial cusps, especially the mesiofacial cusp, located more lingually or facially in comparison to the lingual cusps to the lingual outline?

Answer 29

The tips of both facial cusps are located more lingually from the facial outline of the crown than the tips of the lingual cusps in relation to the lingual outline

Question 30

Mandibular Second Molar: (Occlusal) T or F, The facial groove and the lingual groove meet the central groove at obtuse angles that divide the occlusal surface into mesial and distal halves

Answer 30

False, They meet the central groove at right angles

Question 31

Mandibular Second Molar: (Occlusal) The three major grooves present a structure that is said to look like what?

Answer 31

A plus sign (+) or a cross design. This makes an arrangement of 4 cusps of approximately equal size with a + sign dividing them.

Question 32

Mandibular Second Molar: (Occlusal) The central pit forms where what three grooves meet? This pit is located on what half of the crown?

Answer 32

Pit forms where the facial, lingual and central grooves meet and is located on the lingual half of the crown

Question 33

Mandibular Second Molar: (Occlusal) T or F, The lateral ends of the central groove are in the mesial triangular fossae only and has a respective mesial triangular pit

Answer 33

false, The lateral ends of the central groove are in the mesial and distal triangular fossae and each end has a respective mesial and distal triangular pit

Question 34

Mandibular Second Molar: (Occlusal) T or F, Each cusp has mesial and distal cuspal ridges extending laterally, as well as a triangular ridge that extends toward the central fossa. On most specimens the triangular ridges meet to form two oblique ridges

Answer 34

False, They form two transverse ridges

Question 35

Mandibular Third Molar: (Facial) The two facial cusp variety ends in what? What portion of crown surface is it found in?

Answer 35

A facial pit, approximately in the middle third of the surface

Question 36

Mandibular Third Molar: (Facial) T or F, The facial pit usually exhibits decay because it is difficult for the patient to clean in this area of the mouth

Answer 36

True

Question 37

Mandibular Third Molar: (Mesial) The central groove is positioned how?

Answer 37

Lingual to the faciolingual long axis bisector

Question 38

Mandibular Third Molar: (Occlusal) The crown is wider or narrower mesiodistally than it is faciolingually?

Answer 38

Wider

Question 39

Mandibular Third Molar: (Occlusal) T or F, The crown is wider faciolingually than it is mesiodistally

Answer 39

False, It is wider mesiodistally than it is faciolingually