Premolar Comparisons Flashcards
Maxillary buccal view: crown symmetry
Greater symmetry on maxillary 2nd premolar
Maxillary buccal view: occlusal-cervical dimension
Larger on maxillary 1st premolar
Maxillary buccal view: cervical width
Wider cervical neck on maxillary 2nd premolar
Maxillary buccal view: buccal cusp sharpness
Sharper on maxillary 1st premolar
Maxillary buccal view: buccal cusp ridge lengths
Mesial cusp ridge on maxillary 1st premoler is longer
Mesial cusp ridge on maxillary 2nd premolar is shorter
Maxillary buccal view: buccal cusp ridge depressions
More often found on maxillary 1st premolar
Maxillary buccal view: buccal ridge prominence
More prominent on maxillary 1st premolar
Maxillary mesial view: cusp height difference
Larger on maxillary 1st premolar
Maxillary mesial view: mesial crown concavity
Note its significance
Present on maxillary 1st premolar (good place for bacteria deposit –> cavities)
Maxillary mesial view: mesial marginal ridge groove
Present on maxillary 1st premolar
Maxillary mesial view: number of roots
Maxillary 1st premolar = 2 (buccal and pharyngeal)
Maxillary 2nd premolar = 1 root
(Important to know for root canals)
Maxillary mesial view: developmental root depression
Give the significance of this morphology
Deeper on maxillary 1st premolar (can be area for caries)
Occlusal view: outline form
More rounded on maxillary 2nd premolar
Maxillary occlusal view: lingual cusp displacement
Greater mesial displacement of lingual cusp on maxillary 1st premolar
Maxillary occlusal view: mesial surface convexity
Greater on maxillary 2nd premolar
Maxillary occlusal view: buccal ridge prominence
More prominent on maxillary 1st premolar
Maxillary occlusal view: mesial marginal ridge groove
Present on maxillary 1st premolar
Maxillary occlusal view: central developmental groove lengths
Slightly longer on maxillary 1st premolar
Maxillary occlusal view: marginal ridge width
Wider on maxillary 2nd premolar
Maxillary occlusal view: location of pits
Maxillary 1st premolar = closer to marginal ridges
Maxillary 2nd premolar = closer to center of tooth
Maxillary occlusal view: mesio-buccal and disto-buccal line angles
More prominent and angular on maxillary 1st premolar
Mandibular buccal view: occlusal cervical crown dimension
Greater on mandibular 1st premolar
Mandibular buccal view: buccal cusp height
Greater on mandibular 1st premolar
Mandibular buccal view: buccal cusp sharpness
Greater on mandibular 1st premolar
Mandibular lingual view: llingual cusp heights
Greater on mandibular 2nd premolar
Mandibular lingual view: occlusal surface visibility
Greater on mandibular 1st premolar
Mandibular lingual view: lingual groove presence
Present on mandibular 2nd premolar with 3 cusps (1 buccal, 2 lingual)
Mandibular lingual view: marginal ridge positions
1st premolar = mesial is more cervical than distal
2nd premolar = distal is slightly more cervical than mesial
Mandibular mesial view: lingual cusp heights
Greater on mandibular 2nd premolar
Mandibular mesial view: buccal cusp locations
2nd premolar = slightly more buccal
Mandibular mesial view: marginal ridge angulations
1st premolar = lingual slope
2nd premolar = horizontal
Mandibular mesial view: mesio-lingual groove
Present on mandibular 1st premolar (do not confuse with 2nd premolar lingual groove)
Mandibular mesial view: difference in cusp heights
Greater on mandibular 1st premolar
Mandibular mesial view: occlusal surface visibility
Greater on mandibular 1st premolar
Mandibular occlusal view: number of cusps
1st premolar = 2 cusps
2nd premolar = 2 or 3 cusps
Occlusal view: bucco-lingual crown dimension
Greater on mandibular 2nd premolar
Mandibular occlusal view: crown outline form
1st premolar = diamond shaped
2nd premolar = square or oval
Mandibular occlusal view: pits locations
1st premolar = mesial and distal
2nd premolar = mesial, distal and central
Mandibular occlusal view: occlusal table size
Larger on mandibular 2nd premolar
Mandibular occlusal view: developmental groove form
1st premolar = straight line
2nd premolar = Y-shaped
Tooth numbers of premolars
maxillary premolars = 1.5, 1.4, 2.4, 2.5
mandibular premolars = 3.5, 3.4, 4.4, 4.5
