Tooth ID + Radiographic Anatomy

Question 1

Upper central incisor

Answer 1

• Larger than upper lateral incisor
• Mesioincisal angle is sharp and the distoincisal angle is rounded
• Incisal edge is straight
• Cingulum is centralised
• Conical and round root

Question 2

Upper lateral incisor

Answer 2

• Incisal edge is sloping distally
• Cingulum is twisted distally
• Root apex curved distally
• Presence of palatal pit
• Both incisal angles are rounded

Question 3

Lower central incisor

Answer 3

• Most symmetrical teeth
• Smallest teeth in the oral cavity
• Lingually inclined
• Incisal edge and cingulum – centralised
• Mesioincisal and distoincisal angles are sharp

Question 4

Lower lateral incisor

Answer 4

• Larger than lower central incisor
• Has sharp mesioincisal angle and round distoincisal angle
• Incisal edge sloping distally
• Cingulum twisted distally
• Root apex curved distally

Question 5

Upper Canine

Answer 5

• The Crown is shorter and broader
• Lingual ridge is very prominent
• The lingual ridge runs from the cusp tip to the cingulum – divides lingual
  fossae into two
• Longest root in the oral cavity
• Cusp tip is pointed
• The mesial cusp slope is shorter than the distal cusp slope
• Root is curved distally

Question 6

Lower canine

Answer 6

• Crown is longer and narrower
• Lingual ridge is present only on the incisal third
• Crown is lingually inclined
• Cusp tip is less pointed than the upper canine
• Mesial cusp slope is shorter than distal cusp slope
• Root is shorter than upper canine
• Root is curved distally

Question 7

Upper first premolar

Answer 7

• Upper first premolar
• Two cusps present – lingual cusp is shorter than buccal cusp by 1 mm
• Mesial slope of the buccal cusp is slightly longer than the distal slope.
• Canine fossae present mesially
• MMDG (Mesial marginal developmental groove) is present mesially
• Occlusal surface – hexagonal in shape
• Longer central developmental groove
• Usually, two roots are present

Question 8

Upper second premolar

Answer 8

• No canine fossa
• NO MMDG
• Mesial slope of the buccal cusp is shorter than distal slope
• Occlusal surface – oval
• Buccal and lingual cusp similar length
• Buccal side is larger than lingual
• Short central developmental groove
• Presence of supplementary grooves
• Mostly single root

Question 9

Lower first premolar

Answer 9

• Severe lingual inclination
• Severe lingual convergence (lingual cusp is very small)
• Occlusal outline – diamond
• Snake eyes appearance – occlusal surface
• MLDG (mesiolingual developmental groove) is present

Question 10

Lower second premolar – can have 2 or 3 cusps.
Occlusal surface – 2 cusp type

Answer 10

• Oval shaped
• Has lingual convergence
• U-shaped or H-shaped CDG
• Supplementary groove present

Question 11

Lower second premolar – can have 2 or 3 cusps.
Occlusal surface – 3 cusp type

Answer 11

• Square shaped
• No lingual inclination and no lingual convergence
• Y-shaped CDG
• One buccal cusp and two lingual cusp – one large mesiolingual cusp and distolingual cusp
• Supplementary grooves present

Question 12

Upper molars, in general

Answer 12

• Thickness (Buccolingual) > Width (Mesiodistal)
• 3 roots - Two buccal roots and one palatal (longest root)

Question 13

Upper first molar

Answer 13

• Tubercle of carabelli present
• Occlusal surface is rhomboid with 4 cusps
• Mesiolingual is the largest cusp with tubercle of carabelli present
• Oblique ridge connects between ML (mesiolingual) and DB (distobuccal) cusps
• Roots are long and widely placed

Question 14

Upper second molar

Answer 14

• Occlusal surface is rhomboid (4 cusps) or heart-shaped (4 or 3 cusps)
• No tubercle of carabelli
• Roots are shorter and less widely placed
• Mesial cusps are bigger

Question 15

Upper third molar

Answer 15

• Occlusal surface is rhomboid or heart-shaped
• No tubercle of carabelli
• Multiple supplementary grooves
• Root is short and fused
• No distal contact area
• Mesial cusps are bigger

Question 16

Lower molars, in general

Answer 16

• Width (Mesiodistal) > Thickness (Buccolingual)
• 2 roots – mesial and distal

Question 17

Lower first molar

Answer 17

• Occlusal surface is hexagonal
• Has 5 cusps – Three buccal (Mesiobuccal, Distobuccal, and Distal) and two lingual (Mesiolingual and Distolingual)
• Roots are long and widely placed – mesial and distal

Question 18

Lower second molar

Answer 18

• Has four cusps that are nearly equal in size
• Occlusal surface is rectangular
• Has cross-form developmental groove
• Roots are short and less widely placed
• Distal side is smaller than mesial
• Has a buccal groove

Question 19

Lower third molar

Answer 19

• It may look like 1st molar (5 cusps) or like 2nd molar (4 cusps)
• Multiple supplementary grooves
• Roots are short, may be fused or distally curved
• No distal contact area
• Has a buccal groove