Molar Comparisons Flashcards
Teeth included in maxillary molars
1st molars = 1.6, 2.6
2nd molars = 1.7, 2.7
3rd molars = 1.8, 2.8
Maxillary muccal view: give the mesio-distal crown dimensions from largest to smallest
1st > 2nd > 3rd
Maxillary buccal view: give the occlusal-cervical crown dimensions from largest to smallest
1st > 2nd > 3rd
Maxillary buccal view: compare the mesio-buccal and disto-buccal cusp widths of all 3 molars
- 1st = M-B > D-B
- 2nd = M-B >> D-B
- 3rd = M-B >>> D-B
Maxillary buccal view: compare the mesio-buccal and disto-buccal cusp heights of each molar
- 1st = M-B = D-B
- 2nd = M-B > D-B
- 3rd = M-B > D-B
Maxillary buccal view: compare the buccal developmental grooves of the molars
On 2nd molar, the buccal developmental groove is farther distal, shorter, with no pit at the end
Maxillary buccal view: root lengths
1st = 2nd
3rd is shortest
Maxillary buccal view: root separation
1st > 2nd > 3rd
NOTE: Fusion of roots common on 3rd and somtimes on 2nd
Maxillary buccal view: root curvature
Distal inclincation: 3rd > 2nd > 1st
Define the root trunk
The portion of the root located between the CEJ and the furcation
Maxillary buccal view: root trunk dimensions
3rd > 2nd > 1st
Maxillary lingual view: 5th cusp (cusp of Carabelli)
Present on 70% of 1st molars
Located on P aspect of mesio-palatal cusp
Maxillary lingual view: disto-palatal cusp size
1st > 2nd (both width and height)
Absent on 3rd
Maxillary-lingual view: disto-palatal developmental groove
Farther distal and shorter on the 2nd
Maxillary-lingual view: palatal root width
1st > 2nd > 3rd
Maxillary lingual view: location of palatal root apex
- 1st = aligned with palatal groove
- 2nd = aligned with disto-palatal cusp tip
- 3rd = shifted distally
Maxillary occlusal view: outline forms
1st and 2nd = rhomboidal
3rd = more bulbous and rounded
Maxillary occlusal view: bucco-palatal crown dimension
1st and 2nd approx. equal
3rd is smaller
Maxillary occlusal view: palatal crown width
1st > 2nd > 3rd
Maxillary occlusal view: distal crown taper
3rd > 2nd > 1st
Maxillary occlusal view: mesial vs. distal cusp sizes
- Mesio-buccal and mesio-palatal: 1st = 2nd
- Disto-buccal and disto-palatal: 1st > 2nd
Maxillary occlusal view: disto-palatal cusp size
1st > 2nd
Absent on 3rd
Maxillary occlusal view: Oblique ridge size
1st > 2nd > 3rd
Numbers of mandibular molars
1st = 3.6, 4.6
2nd = 3.7, 4.7
3rd = 3.8, 4,8
Mandibular buccal view: mesio-distal crown dimensions
1st > 2nd > 3rd
Mandibular buccal view: number of buccal cusps
1st = 3
2nd and 3rd = 2
Mandibular buccal view: number of buccal grooves
1st = 2
2nd and 3rd = 1
Mandibular buccal view: root length
1st > 2nd > 3rd
Mandibular buccal view: root separation
1st > 2nd > 3rd
Mandibular buccal view: root curvature
Distal inclination: 3rd > 2nd > 1st
Mandibular buccal view: root trunk height
3rd > 2nd > 1st
Mandibular occlusal view: outline form
1st = pentagonal
2nd = rectangular
3rd = round/ ovoid
Mandibular occlusal view: bucco-lingual crown dimension
1st > 2nd > 3rd
Mandibular occlusal view: number of cusps
1st = 5
2nd and 3rd = 4
Mandibular occlusal view: mesio-buccal prominence
Found on second molars
Mandibular occlusal view: proximal crown form
1st = straight and converge towards the lingual
2nd = curved
3rd = more curved
Mandibular occlusal view: Developmental groove patterns
1st = zig-zag
2nd = plus-sign
3rd = no pattern
