CHAPTER 11: Overview of dentitions

Question 1

name the three types of dentitions

Answer 1

Primary dentition
Mixed dentition
Permanent dentition

Question 2

when does primary dentition start and end?

Answer 2

starts at 6 months and ends at 6 years

Question 3

when does mixed dentition start and end?

Answer 3

starts at 6 years and ends at 12 years

Question 4

when does permanent dentition start

Answer 4

starts at 12+ years

Question 5

which tooth starts the primary dentition?

Answer 5

the eruption of primary mandibular central incisors

Question 6

which tooth eruption ends primary dentition?

Answer 6

the eruption of permanent molars

Question 7

what is the mixed dentition?

Answer 7

mixture of primary and permanent teeth

Question 8

when does permanent dentition start?

Answer 8

when all primary teeth are lost.

Question 9

what are dental arches?

Answer 9

where all the teeth are present

Question 10

how many dental arches are there? what are they called

Answer 10

two
- maxillary
mandibular

Question 11

what is occlusion?

Answer 11

when the teeth of both arches are in contact

Question 12

what are quadrants?

Answer 12

when the maxillary and mandibular are divided into halves resulting in four sections

Question 13

what is a sextant

Answer 13

one sixth of the dentition

division into six parts of the dental arches

Question 14

which teeth are considered anterior teeth?

Answer 14

the incisors and canines (the teeth present when smiling)

Question 15

which teeth are considered posterior teeth?

Answer 15

pre molars and molars

Question 16

permanent dentition is divided into how many types of teeth?

Answer 16

4

Question 17

what are the four types of teeth called?

Answer 17

incisors
canines
pre molars
molars

Question 18

which teeth are the longest teeth in the dentition and are called the “cornerstone” of the dental arch

Answer 18

canine

Question 19

what is the function of the pre molars?

Answer 19

help grind and chew the food (specially the second pre molar)

Question 20

what are the function of the 12 molars?

Answer 20

chew and grind up food

Question 21

all crown of ANY tooth narrows towards what line? this is true for ALL types of teeth

Answer 21

cervical line (where the crown and the root meet)

Question 22

what is contact area?

Answer 22

area of the mesial or distal surface of a tooth that touches the adjacent tooth in the same arch
(teeth side by side touching each other)

Question 23

what is embrasure?

Answer 23

the triangular SPACE near gingiva between the proximal surfaces of two adjoining teeth

Question 24

what is a line angle?

Answer 24

formed by the junction of TWO surfaces. the place where two surfaces of teeth are joining.

Question 25

what is point angle?

Answer 25

angle formed by the junction of THREE surfaces at one point

Question 26

how many line angles are there in total ?

Answer 26

8

Question 27

what are the 8 line angles?

Answer 27

``` MO DO OB OL MB BB ML DL ```

Question 28

what is malocclusion?

Answer 28

when the upper and lower teeth don't bite together properly / close correctly. - abnormal or malpositioned relationships of the maxillary teeth to the mandibular teeth

Question 29

what is centric occlusion?

Answer 29

when the jaws are closed in a position that produces maximum stable contact - jaws are centered and closed properly

Question 30

how many types of occlusions are there?

Answer 30

three

Question 31

what are the three types of occlusion?

Answer 31

``` class I neutroclussion class II distoclussion class III mesioclussion ```

Question 32

Quadrant numbering for permanent teeth

Answer 32

quadrant# 1 2 3 4 | teeth # 12345678

Question 33

quadrant numbering for primary teeth

Answer 33

quadrant# 5 6 7 8 | teeth# 1 2 3 4 5 6 7 8

Question 34

difference between central incisor vs lateral incisor

Answer 34

central incisor is wider- squarish | lateral incisor is narrower, rectangular

Question 35

what teeth numbering system is used in the USA?

Answer 35

universal/national system | letters from A-T

Question 36

what teeth numbering system is used in CANADA?

Answer 36

ISO/FDI | quadrants of 4 and teeth numbering from 1-8