Dentition Flashcards
(38 cards)
What is a good way to determine if a tooth is permanent or deciduous?
Permanent teeth are colored yellow.
What are the five surfaces of each tooth?
1) Labial/buccal: facing the cheeks or lips
2) Lingual: facing the tongue
3) Occlusal: top of tooth (biting surface)
4) Mesial: facing the median line
5) Distal: facing AWAY from the median line
True or false: premolars are only deciduous
False- premolars are only adult teeth!
What are the differences of deciduous molars from adult molars?
1) Smaller
2) Yellower
3) Thinner roots
4) Roots are wider apart
5) Have a marked wasting
6) Lower DM1 has a distinct morphology
How do you identify incisors?
Characterized by a sharp single root with a sharp occlusal (mesiodistal) ridge.
What are the features of an incisor?
1) A single root
2) A single crown with an occlusal (mesiodistal) edge
3) A shovel-shaped lingual surface
What are features of a canine?
1) A single large root
2) A single pointed cusp
3) A large root in relation to its crown
4) The longest tooth in the mouth
How do you identify a premolar?
1) Usually has two cusps; one buccal and one lingual
2) Usually smaller than a molar
How do you differentiate an upper incisor from a lower incisor?
1) Large
2) Shovel-like crown
3) Cingulum
How do you differentiate a lower incisor from an upper incisor?
1) Small
2) Narrow crown
3) NO cingulum
How do you differentiate an upper canine from a lower canine?
1) Wider crown
2) Larger size
3) Sharper single-point cusp
4) Expanded cingulum
How do you differentiate a lower canine from an upper canine?
1) Narrower crown
2) Smaller size
3) A blunt single-point cusp
4) Reduced cingulum
How do you differentiate an upper premolar from a lower premolar?
1) Has cusps of equal size
2) Usually has 2 roots, one buccal and one lingual (like the cusps)
3) May have fused roots, but the line of fusion cannot be seen.
How do you differentiate a lower premolar from an upper premolar?
1) A large buccal cusp
2) A single root, wider buccolingually and narrower mesiodistally
3) A root tip that sources dust ally when viewed from the lingual surface
How do you differentiate an upper molar from a lower molar?
1) Has 3 roots that may be fused
2) Roots are arranged as: one lingual, one mesiobuccal, and one distobuccal
3) A more square crown
4) Usually 4 or 3 cusps
How do you differentiate a lower molar from an upper molar?
1) Two roots that may be fused
2) Roots arranged as: one mesial and one distal
3) A crown that is more oblong
4) Usually 4 or 5 cusps
How do you differentiate an upper central incisor from an upper lateral incisor?
1) Largest of the incisors
2) Has a square mesial angle of crown
3) Has a rounded distal angle of crown
4) Is most likely to have a shovel shape
How do you differentiate an upper lateral incisor from an upper central incisor?
1) Smaller than an upper central incisor
2) Usually has a pit at the base of the cingulum
3) May have a shovel shape
How do you differentiate a lower central incisor from a lower lateral incisor?
It is the smallest of the incisors
How do you differentiate a lower lateral incisor from a lower central incisor?
1) Larger than a lower central incisor, but smaller than an upper
2) Has a wider crown (spreading out into a fan shape) at the occlusal surface
How do you differentiate an upper PM3 vs PM4?
1) PM3 usually has 2 roots
2) Buccal cusp may be larger
3) Mesial surface of the crown is concave
How do you differentiate an upper PM4 vs. a PM3?
1) PM4 usually has 1 root
2) Both cusps are about equal
3) The mesial surface of the crown is convex
How do you differentiate a lower PM3 vs. a PM4?
1) Has a small, single, lingual cusp
2) May have a groove at the mesial surface of its root
3) May have a larger buccal cusp
How do you differentiate a lower PM4 vs. a PM3?
1) Has a small, sometimes double lingual cusp
2) Has no groove at the mesial surface of its root
3) Has cusps of equal size
