Flashcards in Dental Anatomy V - Quiz 4 Deck (44):
Name the Facial Cusps of the Mandibular 1st Molar?
Describe the Facial Cusps of the Mandibular 1st Molar
Mesiofacial - Almost Flat
Distofacial - 90 degrees, More Pointed than MF
Distal - very small, Lingual, more pointed than MF or DF
Describe the MF cusp of the Mdb1M
Describe the DF cusp of the Mdb1M
More pointed than MF
Describe the Distal cusp of the Mdb1M
More pointed than MF or DF
There is no Facial groove in the Mdb1M
*Two of them
- Mesiofacial groove
- Distofacial groove
Which groove is shorter, the Mesiofacial or Distofacial groove of the Mdb1M?
The Mesiofacial groove of the Mdb1M extends from the ______ to the ______.
Halfway to Cervical Line
What is at the end of the MF groove of the Mdb1M?
Slight lateral depression
How long is the Root Trunk in the Facial aspect of the Mdb1M?
Describe the Depression on the facial aspect of the Mdb1M
progressively Shallow occlusally
Does NOT cross cervical line
How are the 2 roots of the Mdb1M positioned from the Facial aspect?
How do the roots of the Mdb1M compare to the roots of the Mdb2M?
Which root length is greater in the Mdb1M, the Facial or Lingual aspect?
Cervical line has moved occlusally 1mm on the Lingual side
Where is the Cervical Line higher in the Mdb1M, Lingual or Facial?
By how much?
(making root length 4mm)
From the mesial aspect of the Mdb1M, what shap is the crown outline?
Mesial aspect Mdb1M: The Crest of Contour of the Cervical Ridge is _______ than MaxM's, but _______.
Still in Cervical 1/3
Mdb1M - Mesial Aspect
What is the angle between the Triangular Ridge of the ML cusp and the Mesial Marginal Ridge?
Why can very little occlusal surface be seen from the Mesial Aspect of the Mdb1M?
Mesial cusps Taller
Mdb1M - Distal Aspect
The facial outline of the Distal Cusp is _____ to the facial outline of the taller _____ cusp
From the Distal Aspect Mdb1M, what is superimposed onto the Distofacial Cusp?
Entire Distal Cusp
What EXCLUSIVELY makes up the distal contact area of the Mdb1M?
Where is this located in relation to the faciolingual bisector of the crown?
(definitely NOT lined up)
Mdb1M - Distal Aspect
Both the distal and distofacial cusp tips are _____ to the apices of the mesial and distal roots.
What is the most Facially placed cusp in the Mdb1M?
What is the most Distally placed cusp in the Mdb1M?
What is the most Mesially placed cusp in the Mdb1M?
What are the cusp sizes of the Mdb1M from largest to smallest?
Mdb2M - Facial Aspect
How many facial grooves?
What does it divide?
Where does it end?
Mesiofacial and Distofacial cusps
Distinct pit in Middle 1/3 of crown
What are the 2 pieces of Negative Anatomy on the Facial Aspect of the Mdb2M?
Facial Pit (middle 1/3)
Describe the path and location of the facial groove in the Mdb2M
path: slight Mesial bend toward Facial Pit
location: slightly Distal to vertical line dividing line in half
Mesiofacial cusp is located closer to:
Vertical faciolingual long axis bisector, or
Vertical faciolingual long axis bisector
Mb2M - Occlusal View
Which set of cusps is offset further from their respective outlines?
What 1 cusp in particular?
Mesiofacial cusp especially
Describe the Lingual cusps of the Mb2M
Not as offset as far from Lingual outline as Facial cusps are offset from Facial outline
What divides the Occlusal surface of the Mb2M into halves?
What meets at right angles at the Central Groove of the Mb2M?
(these are the 3 major grooves)
What do the facial, lingual, and central grooves of the Mb2M make?
What does this delineate?
4 cusps approximately equal size
To what side is the central pit of the Mb2M offset?
*forms from facial, lingual, central grooves
Where do the lateral ends of the central groove end in the Mb2M?
Mesial and Distal Triangular fossae
The Mesial and Distal Triangular fossae of the Mb2M each have a triangular Pit
Each of the 4 cusps of the Mb2M have 3 features.
What are they?
Mesial and Distal Cuspal Ridges
The Triangular Ridges of the Mb2M form what?
2 Transverse Ridges
What feature of the Mb3M often exhibits decay because it is difficult to clean?
Where is it located?
Middle 1/3 Facial aspect
Mb3M - Mesial aspect
Where is the Central Groove located?
Lingual to faciolingual long axis bisector