The Mand. first molar features ….. cusps
five (three buccal and two lingual)
* The largest is the MB, then the DB, and the smallest is the distal
The Mand. first molar buccal surface shows two grooves, ……. & …….
- MB groove: separates the MB cusp from the DB cusp. Ends in the buccal pit
- DB groove: separates the DB cusp from the distal cusp
The Mand. first molar buccal height of contour is at …….
cervical third (called the buccal cervical ridge) * The buccal surface above the ridge is relatively flat
The Mand. first molar mesial surface is ……., while the distal is …….
concave at the cervical third, convex at the upper two thirds
* convex throughout
The Mand. first molar buccal crown profile can be seen from the lingual because …….
the buccal surface is wider than the lingual
* Note that: the mesial surface is also wider than the distal surface
The Mand. first molar lingual groove separates ……..
the two equally sized lingual cusps
The Mand. first molar lingual height of contour is ……
high at the middle third
* The lingual surface is convex in the upper two thirds and flat in the lower third
The Mand. first molar occlusal view shows …..
- the mesial (large) & distal (small) marginal ridges cut by developmental grooves
- Most of the buccal surface can be seen in the occlusal view
- Crown profile is pentagonal
- three fossae: central, mesial and distal
The Mand. first molar central fossa features …..
a central pit, from which the MB groove and the lingual groove extend. A central groove runs through to end in the mesial and distal pit
* The DB groove originate from the central groove distally to the central pit
The broadest root in the lower arch is …….
the mesial root of the first molar
- broadest in buccolingual dimension
- features a distinct proximal root concavity
- The distal root is smaller and may also have a proximal concavity
- Note that: the root apices are rounded
The Mand. second molar has ….. cusps
four
The Mand. second molar is similar to the first molar except for ……..
- smaller
- no distal cusp
- buccal and lingual surfaces are equal in length, so is the mesial and distal
- one buccal groove
The Mand. second molar occlusal view features:
- rectangular outline
- central fossa, with central pit, central groove, and lingual & buccal grooves
- mesial and distal triangular fossae
- no developmental grooves across the marginal ridges
The roots of the Mand. second molar is similar to the first molar except:
more distally inclined, closer together, pointed root apex, and no proximal root concavities
* Note that: the roots of the third molar is even more distally inclined
The Mand. third molar occlusal view shows …… occlusal table
ovoid
* Usually, have 4 cusps
