dental anatomy lecture 1 introduction

1. Dental Anatomy
Lecture 1
Introduction
Nomenclature
• Dense = Tooth
• Dental = anything related to teeth
• Human is a heterodent,
which means that he has di
ff
erent-shaped teeth.
• Human is a diphyodont,
which means that he has two sets of teeth ;
1. Deciduous teeth (Primary teeth).
2. Permanent teeth (Secondary teeth).
NOMENCLATURE 1

2. The Deciduous
Teeth
Primary teeth
The Permanent
Teeth
Secondary teeth
NOMENCLATURE 2

3. The Deciduous Teeth
At Birth ( Natal Period )
• There are no teeth present in the mouth, but many teeth in various
stages of development are found in the jaws.
The Deciduous Teeth
After Birth ( Post- Natal Period )
• The eruption of deciduous teeth starts at six months and lasts until
two and a half years.
• They stay until the permanent teeth erupt at about 6 years of age,
when the transition to the permanent dentition begins.
NOMENCLATURE 3

4. The Deciduous Teeth
Number / Formula
• They are 20 in number.
• They have the following formula:
2 1 2
I — C — M — = 10 (for each side).
2 1 2
• I = Incisors (Central and Lateral).
• C = Canine.
• M = Molars (First and Second).
NOMENCLATURE 4

5. The Permanent Teeth
• The transition to permanent dentition begins with the emergence and
eruption of the first permanent molars at the age of six years.
• Followed by shedding of the deciduous teeth and emergence and
eruption of the remaining permanent teeth.
• This process requires about 20 years to be completed.
NOMENCLATURE 5

6. The Permanent Teeth
Number / Formula
• They are 32 in number (including third molars when present).
• They have the following formula:
2 1 2 3
I — C — P — M — = 16 (for each side).
2 1 2 3
• I = Incisors (Central and Lateral).
• C = Canine.
• P = Premolars (First and Second).
• M = Molars (First, Second and third).
NOMENCLATURE 6

7. Anterior and Posterior
Teeth Groups
Anterior Teeth
Which include the Incisors and the Canines.
Posterior Teeth
Which include the Premolars and the Molars.
NOMENCLATURE 7

8. The Jaw
Is the bone which carries the teeth.
Upper and Lower
The Jaw types
The Upper Jaw
• Which is
fi
xed.
• Called The Maxilla.
The Lower Jaw
• Which is Movable.
• Called The Mandible.
NOMENCLATURE 8
END