Quiz 4 Review Flashcards
Mandibular First Molar: (Facial) The cuspal ridges of the mesiofacial cusp meet at what angle?
At an angle that is almost flat
Mandibular First Molar: (Facial) The distofacial cusp has cuspal ridges that give rise to what?
To a more pointed cusp tip than the mesiofacial cusp, but the cusp tip is still rounded
Mandibular First Molar: (Facial) What cusp comprises a very small part of the total mesiodistal width of the facial surface? Why?
Distal cusp
- Because most of the cusp is lingual to the distofacial line angle placing it on the distal aspect of the tooth
Mandibular First Molar: (Facial) Which cusp is the most pointed from this view?
The distal cusp is more pointed than either the mesiofacial or distofacial cusp
Mandibular First Molar: (Facial) Which groove is shorter from the facial aspect? This shorter groove terminates where and how?
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
Mandibular First Molar: (Facial) The mesiofacial groove has what at its terminus?
A pit or depression that extends laterally and commonly requires restoration that is termed a “facial” or “buccal” pit
Mandibular First Molar: (Facial) The root trunk from the facial aspect measures what on average?
3.0 mm
Mandibular First Molar: On which aspect is there a deep depression between the roots? What is the overall makeup and shape of this depression?
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.
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
False, longer and more divergent than those of the mandibular second or third molar
Mandibular First Molar: (Lingual) The cervical line is positioned approximately what measurement higher or lower on the lingual surface than on the facial surface?
1.0 mm higher on the lingual surface than on the facial surface
Mandibular First Molar: (Lingual) The root trunk measurement will be what measurement from cervical line to bifurcation on the lingual aspect of the tooth?
1.0 mm longer (average 4.0 mm total)
Mandibular First Molar: (Lingual) When measured on the lingual, the total root length is greater or less and why?
Greater because the roots are measured from the cervical line to the apex.
Mandibular First Molar: (Mesial) Mesial crown outline is what shape?
Rhomboidal shaped
Mandibular First Molar: (Mesial) The greatest curvature of the facial outline is at what portion of the crown?
At the cervical third of the crown and is termed the cervical ridge.
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
Higher
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
30 degrees
Mandibular First Molar: (Mesial) Which cusps are taller? Mesial or Distal?
Mesial cusps are taller
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?
Very little of the occlusal surface can be viewed
Mandibular First Molar: (Distal) The facial outline of the distal cusp is located where?
Lingual to the facial outline of the taller distofacial cusp with the entire distal cusp superimposed onto the distofacial cusp
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?
False, it is slightly facial to the faciolingual vertical bisector of the crown.
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?
False, The distal cusp exclusively comprises the distal contact area
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?
Facial to the apices of the mesial and distal roots
Mandibular First Molar: (Occlusal) Which cusp is most facially placed? Which cusp is most mesially placed cusp on the tooth?
- Distofacial cusp is most facially placed
- Mesiolingual cusp is most mesially placed
Mandibular First Molar: (Occlusal) The cusp sizes from largest to smallest?
- Mesiofacial
- Mesiolingual
- Distolingual
- Distofacial
- Distal cusp
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?
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
Mandibular Second Molar: (Facial) T or F, The facial groove is completely vertical
False, it is vertical, except for a slight mesial inclination at the facial pit
Mandibular Second Molar: (Facial) T or F, The facial groove is located slightly distal to the vertical line dividing the crown in half, mesiodistally
True
Mandibular Second Molar: (Mesial) The tip of the mesiofacial cusp is closer to what axis bisector of the tooth?
Closer to the vertical faciolingual axis bisector rather than to the greatest facial outline of the crown
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?
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
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
False, They meet the central groove at right angles
Mandibular Second Molar: (Occlusal) The three major grooves present a structure that is said to look like what?
A plus sign (+) or a cross design. This makes an arrangement of 4 cusps of approximately equal size with a + sign dividing them.
Mandibular Second Molar: (Occlusal) The central pit forms where what three grooves meet? This pit is located on what half of the crown?
Pit forms where the facial, lingual and central grooves meet and is located on the lingual half of the crown
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
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
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
False, They form two transverse ridges
Mandibular Third Molar: (Facial) The two facial cusp variety ends in what? What portion of crown surface is it found in?
A facial pit, approximately in the middle third of the surface
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
True
Mandibular Third Molar: (Mesial) The central groove is positioned how?
Lingual to the faciolingual long axis bisector
Mandibular Third Molar: (Occlusal) The crown is wider or narrower mesiodistally than it is faciolingually?
Wider
Mandibular Third Molar: (Occlusal) T or F, The crown is wider faciolingually than it is mesiodistally
False, It is wider mesiodistally than it is faciolingually
