Dental Anatomy Basics Flashcards
How many primary teeth are there? What are they?
20, 10 in maxilla and 10 in mandible; 4 incisors, 2 canines, and 4 molars on each side
How are permanent teeth oriented in the young child’s skull?
Permanent teeth lie underneath the primary teeth
How are the quadrants of primary teeth numbered?
Teeth quadrants are numbered onwards from 5 to 8. Quadrants continue in the same way right maxillary -> Left maxillary -> Left mandibular -> Right mandibular
How many teeth does the normal adult have? What are they?
32 teeth, 8 incisors (4 central and 4 lateral incisors), 4 canines, 8 premolars, 12 molars
How are teeth numbered?
Quadrants first then the teeth are counted from the midline to the back of the mouth.
What is oligodontia?
The presence of less than normal teeth
What is anodontia?
Lack of teeth
What is hyperdontia?
Presence of too many teeth
What is hypodontia?
Presence of too little teeth
What does down syndrome do to teeth numbers?
Down syndrome is related to both hypo and hyperdontia
What is the mesial surface of the tooth?
Surface facing towards midline
What is the distal surface of the tooth?
Surface facing away from the midline
What surface do the central incisors touch at?
2 central incisors touch at the mesial surface
What is the occlusal surface?
Occlusal surface is the surface that is bitten on
What edge of the teeth is the incisal edge?
The cutting edge of incisors and canines is called the incisal edge.
Why do teeth often protrude in people with special needs?
In patients with special needs often the teeth are being constantly pushed by the tongue leading to teeth protruding outwards
What is the apex of the tooth?
It is the pyramid shaped tip of the roots of the tooth.
What is the dental cervix?
The interface between the crown and the root
What is the surface of the teeth facing outwards called?
Surface facing the lips or cheeks is called the vestibular, buccal, or facial surface
Which surface faces the tongue?
The lingual surface
What are the 3 classes of occlusion and how are they different?
Class 1 Teeth are aligned in Cusp Fossa relationship with their antagonist teeth. This is noted as “NORMAL” occlusion.
Class 2 occlusion is with mandible protruding posteriorly
Class 3 occlusion is with mandible protruding anteriorly.
How are different parts of the teeth differentiated on xray?
Dentin is less white than enamel and is radiolucent. Pulp is dark because it is more radiolucent than dentin and enamel. Dentin is radio-opaque
What kind of relationship do roots have with root canals?
Normally a 1:1 relationship however sometimes there are more root canals per root.
How long does it take for a tooth to develop?
Takes around 2.5 - 3 years for a tooth to develop
Which incisors are larger usually?
The medial incisors
How are upper canines different to lower canines?
Upper canines have more buccal convexity than lower canines.
Which primary teeth are exactly the same structure as the adult teeth?
55 and 16 are very similar in appearance
46 75 are identical
How do people from Asian and mexican descent differ in dentition compared to white people?
People from Asian and Mexican descent have deeper grooves on their premolars and molars. They also have pronounced cingula on their incisors. (Implications for forensics)
When should children develop their primary teeth completely?
5 months in utero there are teeth present. Around the age of 3 – 3 and a half patients should have 20 teeth. First teeth erupt at 6 months. (in white people)
