Flash Cards (Dental Anatomy, Physiology and Occlusion) Part 6
Maxillary Left First Molar
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Universal: 14 International (FDI): 26
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CHARACTERISTICS
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FIRST MOLAR
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Facial/Buccal Aspect
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Dimensions
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Widest of three maxillary molars
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Distobuccal cusp height
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Equals mesiobuccal cusp height
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Proximal contacts
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Cervical-occlusal location of mesial contact
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is at middle third, distal contact is at
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middle third
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Lingual Aspect
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Distolingual cusp
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Largest distolingual cusp
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Lingual root
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Widest mesiodistally
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Occlusal Aspect
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Crown form
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Square to rhomboid
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Lobes
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5
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Dimensions
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Crown length
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7.5 mm (cervico-occlusal)
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Crown diameter
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Mesiodistal
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10.0 mm
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Cervical
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8.0 mm
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Buccolingual
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11.0 mm
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Contour height
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0.5 mm
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Buccal crest
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Cervical third
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Lingual crest
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Middle third
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Root
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Length, buccal
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12.0 mm
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Length, lingual
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13.0 mm
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Chronology
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Eruption
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6 yr
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Root completed
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9-10 yr
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Maxillary Left Second Premolar
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Universal: 13 International (FDI): 25
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CHARACTERISTICS
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SECOND PREMOLAR
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Facial/Buccal Aspect
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Proximal contacts
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Mesial/distal: middle third
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Shoulders
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Narrow
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Buccal cusp
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Not tipped
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Cusp ridges
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Similar
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Cusp size, height
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Shorter
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Lingual Aspect
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Profile not visible
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Mesiomarginal groove
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Does not cross ridge
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Mesial concavity
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Not present
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Mesial root depression
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Present
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Occlusal Aspect
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Profile
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Ovoid
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Central groove
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Short
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Supplemental groves
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Many; often present
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Lobes
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4
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Pulp horn(s)
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2
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Dimensions
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Crown length
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8.5 mm (cervico-occlusal)
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Crown diameter
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Mesiodistal
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7.0 mm
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Cervical
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5.0 mm
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Buccolingual
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9.0 mm
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Contour height
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Facial/buccal crest
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Cervical third
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Lingual
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Middle third
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Root
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Length
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14.0 mm
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Grooves
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No distinct grooves
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Number of roots
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1
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Pulp canal(s)
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Usually 1
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Chronology
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Eruption
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10-12 yr
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Root completed
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12-14 yr
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Maxillary Left Third Molar
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Universal: 16 International (FDI): 28
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CHARACTERISTICS
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THIRD MOLAR
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Facial/Buccal Aspect
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Dimensions
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Smallest of three maxillary molars
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Distobuccal cusp height
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Much less than mesiobuccal cusp
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Proximal contacts
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Cervical-occlusal location of mesial contact
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is at middle third, distal contact is at
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middle third
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Lingual Aspect
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Distolingual cusp
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Usually missing
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Lingual root
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Narrowest
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Occlusal Aspect
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Crown form
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Heart-shaped
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Lobes
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3 or 4
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Dimensions
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Crown length
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6.5 mm (cervico-occlusal)
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Crown diameter
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Mesiodistal
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8.5 mm
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Cervical
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6.5 mm
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Buccolingual
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10.0 mm
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Contour height
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0.5 mm
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Buccal crest
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Cervical third
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Lingual crest
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Middle third
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Root
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Length, buccal
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11.0 mm
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Length, lingual
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Roots fused usually
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Chronology
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Eruption
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17-21 yr
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Root completed
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18-25 yr
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Maxillary Left Second Molar
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Universal: 15 International (FDI): 27
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CHARACTERISTICS
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SECOND MOLAR
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Facial/Buccal Aspect
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Dimensions
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Width between that of first and third
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maxillary molars
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Distobuccal cusp height
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Slightly less than mesiobuccal cusp
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Proximal contacts
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Cervical-occlusal location of mesial contact
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is at middle third, distal contact is at
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middle third
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Lingual Aspect
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Distolingual cusp
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Smaller width/height
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Lingual root
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Narrower
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Occlusal Aspect
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Crown form
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More rhomboidal
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Lobes
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4
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Dimensions
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Crown length
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7.0 mm (cervico-occlusal)
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Crown diameter
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Mesiodistal
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9.0 mm
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Cervical
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7.0 mm
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Buccolingual
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11.0 mm
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Contour height
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0.5 mm
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Buccal crest
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Cervical third
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Lingual crest
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Middle third
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Root
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Length, buccal
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11.0 mm
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Length, lingual
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12.0 mm
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Chronology
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Eruption
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12-13 yr
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Root completed
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14-16 yr
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