Dentition

Question 1

What are the 2 sets of teeth you get called?

Answer 1

Deciduous- 20 teeth

Permanent -32 teeth

Question 2

When do the first permanent teeth erupt and what are they?

Answer 2

6 years

Molars

Question 3

When do the rest of the permanent teeth continue to erupt until?

Answer 3

18 years (and often beyond)
(3rd molars can vary)

Question 4

Between what years do you have ‘mixed dentition’?

Answer 4

6-12

This means you have deciduous and permanent teeth

Question 5

How are your teeth arranged?

Answer 5

In MAXILLARY and MANDIBULAR arches of the upper and lower jaws respectively

Question 6

How many teeth do we have of each type in adult?

Answer 6

32 total
2 incisors
1 canine
2 premolars
3 molars
in each half of the maxillary and mandibular arches

Question 7

How many teeth do we have of each type in deciduous human dentition?

Answer 7

2 incisors
1 canine
2 molars 
in each half of the arch
no pre molars

Question 8

What does each tooth have?

Answer 8

a CROWN

ROOTS in the ALVEOLAR BONE

Question 9

How are teeth identified?

Answer 9

By the shape of the crown

Question 10

Describe the shape of the crown of each type of tooth?

Answer 10

Incisors-thin cutting edges
Canines-single pointed cusps
Premolars- 2 cusps(bicuspid)
molars-3-5 cusps

Question 11

What do you need to do when examining oral cavity?

Answer 11

Note the teeth that are missing and present.

May also have to know the ERUPTION ages of the teeth in both the deciduous and permanent dentition

Question 12

Describe dental notation?

Answer 12

Dentition divided into 4 quadrants(4 halves of the bottom and upper half)

Permanent teeth are denoted 1-8 in each quadrant (1 start form the centre of the mouth and goes back to 8 the last molar)

Deciduous teeth are lettered A-E(A from the centre E to the molars)

Quadrants are :Upper right (UR), Upper left(UL), Lower Right(LR), Lower Left(LL)

Example of a permanent tooth notation would be UL1

Question 13

What are the Eruption and shedding times for deciduous teeth?

Answer 13

Eruption(months):
Central incisor- 6-8 
Lateral incisor-8-10
Canine-16-20
Ist Molar-12-16
2nd Molar-10-12

Shedding(years):
Central incisor-6-7
Lateral Incisor-7-8
Canine-10-12
1st Molar-9-11
2nd Molar-10-12

Question 14

What is the eruption years of permanent teeth?

Answer 14

Central incisor-7-8
Lateral Incisor-8-9
Canine-10-12
1st Pre molar-10-11
2nd Premolar- 11-12
1st Molar-6-7
2nd Molar-12
3rd Molar-13-25

Question 15

What is a Extra-oral examination?

Answer 15

This is usually a visual inspection for any asymmetry, swellings and skin lesions

Question 16

What is an Intra-oral examination for?

Answer 16

With the help of a wooden tongue depressor and a pen torch you will examine the following:

Jaws-Examine range of movements of the mandible.
Ask the patient to open, close, protrude and retrude the lower jaw whilst palpating (with your hands) the temporomandibular joints during these movements

Soft tissues and mucosa-Visually examine the mucosa of the lips, cheek, hard and soft palate, dorsum of the tongue, floor of the mouth(below tongue), and the gums for colour and consistency, inflammation, ulcers, white patches or any other abnormalities
Use wooden tongue depressor to retract the cheeks to expose BUCCAL VESTIBULE identify the opening of the PAROTID DUCT oppposite to the upper 2nd molar tooth(may not be easily visible)

Hard and soft palate- ask patient to say aha and notivce the movement of the soft palate and uvula

Tonsils, oropharynx ans faucial pillars:Inspect the PALATOGLOSSAL and PALATOPHARNGEAL FOLDS at the back of the mouth. Locate PALATINE TONSILS at the entrance of the oropharynx

Tongue and the floor of the mouth- recognise FILIFORM and CIRCUMVALLATE PAPILLAE on the surface of the tongue. Ask patient to lift the tip of the tongue and touch the hard palate so you can see the floor of the mouth. Identify SUBLINGUAL CARUNCLES one on each side of the LINGUAL FRENULUM.The SUBMANDIBULAR GLAND ducts open at the sublingual caruncles

Teeth-Which are present, damaged, not present. It is easier to work from the midline of each dental arch