Mandibular Molars Flashcards
how many cusp do mandib. molars usually have?
4-5
what side is longer when looking at the occlusal table (a major diff. from max. molars )
Mand. molars mesiodistaly are longer
what is the other main diff. from the max molars?
NO oblique ridge
describe the buccal surface of the mand molars in comparison with max molars?(big difference)
Buccal surface is convex and tilted toward lingual
Angles classification Class 1
align
Angles classification Class 2
maxilla is pushed forward
Angles classification Class 3
mandible is pushed forward
Which mand molar is the largest?
1st
which crown in the mouth is the largest mesiodistally?
1st mand molar
which permanent tooth erupts 1st and is more subject to plaque retention?
1st mand molar
What shape has the 1st mand molar due to it’s distal small cusp? (looks like the distal cusp is divided in two angled surfaces)
Pentagonal shape
which surface mesial or distal is slightly larger buccolingually?? (1st mand molar)
mesial
which marginal ridge is more occlusaly placed?(1st mand molar)
mesial
Facial HOC?(1st mand molar)
Cervical 3rd (close to middle 3rd)
Lingul HOC?(1st mand molar)
Middle 3rd (close to occlusal 3rd)
Which side of the 1st mand molar are the cusp sharper?
Lingual
How many cusps?(1st mand molar)
5
Name all the grooves of the 1st mand molar?
Central, Mesiobuccal, Distobuccal, Lingual
Which groove usually ends in a pit and may require restoration if decayed?(1st mand molar)
Both buccal grooves.
Which grooves may cross the HOC?(1st mand molar)
Both Buccal grooves.
which groove never crosses HOC?(1st mand molar)
Lingual
How many pits does it have?(1st mand molar) Name them.
3.
Central, distal, and mesial.
Which pit is the dippest and most prone to decay?(1st mand molar)
Central pit.
What is the position of the roots? (1st mand molar)
one mesial and the secon is distal.
Describe main characteristics of the mesial root? (1st mand molar)
Is flatter and has mesial and distal root depressions
Describe the appearance of the distal root in comparison with the mesial? (1st mand molar)
Distal is more rounded.
How many root canals does it have? (1st mand molar)
Three (2 in the mesial root )
What is the shape of the occlusal table? (2nd mand molar)
Rectangular
Which surface is larger distal/mesial buccolingual? (2nd mand molar)
Mesial is larger buccolingually.
Which cusps are larger?(2nd mand molar)
Mesial cusps
How often does it present a distal cusp?
Never.
What does the occlusal anatomy resembles? (2nd mand molar)
A cross.
Which groove is more evident buccal or lingual?(2nd mand molar)
Buccal?
Describe the central groove and the single central pit? (2nd mand molar)
Long central groove and deep central pit.
Compare the roots of the 2nd with the 1st mand molar?
Both are very similar in structure. (Mesial root is flatter with mesial and distal root depression and the distal root is more rounded) However, 2nd molar roots are less divergent and have a longer root trunk.
Compare third mand molar with the other two?
Smaller and less sharper than 1st and 2nd mand molar
describe the occlussal anatomy? (3rd mand molar)
too many variations
How does the distal surface looks like? (3rd mand molar)
Very rounded.
General 3rd mand molar characteristics?
Great number of accessory grooves, fused roots (sometimes one fused large root)
