بسم الله الرحمن الرحيم
Dentistry (2012-2018)o6u www.facebook.com/groups/asnan.6oct محاضرات دفعة اولى اسنان 2012 Dentistry (2012-2018)o6u www.facebook.com/groups/asnan.6oct
Introduction and Nomenclature By Dr: Hala Zaatar
Dental Arches And Quadrants -Teeth Are Arranged In The Oral Cavity In Two Arches Called The Dental Arches One Lower And One Upper. -The Upper Arch Is Called The Maxilla The Teeth In This Arch Are Called Upper Or Maxillary Teeth. -The Lower Arch Is Called The Mandible The Teeth In This Arch Are Called Lower Or Mandibular Teeth. -Each Dental Arch Has A Midline That Divides The Arch Into Two Approximately Equal Right And Left Segments Named As Quadrant. -There Are Four Quadrants In The Entire Oral Cavity.
Types and Forms of Teeth Humans have two dentitions 1-The primary dentition: (deciduous ) 20 teeth. 10 maxillary and 10 mandibular. 5 teeth are present in each quadrant. 2 incisors. 1 canine. and 2 molars. The dental formula is: 2 1 2 I --- C ---- M ---- = 10
2-The permanent dentition: (secondary, adult or succedaneous ) 32 teeth, 16 maxillary and 16 mandibular. 8 teeth in each quadrant are Present. 2 incisors. 1 canine. 2 premolars. and 3 molars. The dental formula is : 2 1 2 3 I ---- C ---- PM --- M ---- = 16 The permanent molars are not preceeded with deciduous teeth so they may be termed as non-succedaneous teeth.
Deciduous dentition period starts from 6 months till 6 years ( the eruption of the first permanent tooth). From 6 years to 12 years is a mixed dentition period where the deciduous teeth replaced by permanent teeth.
Grouping of Teeth The teeth in the arch can be grouped as follow: 1- Anterior teeth (Incisors and canines). 2- Posterior teeth (premolars and molars). Anterior teeth Posterior teeth
Function Of Teeth 1- Mastication
2- Appearance Nice smile Bad smile
3- Speech
4- Growth of jaws
5- For animals
Numbering and coding systems of the teeth 1)The universal numbering system:. The number is always preceded by the sign # to designate that the system is used for universal system. Permanent teeth (1 – 32) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
OR Deciduous teeth (A - T) A B C D E F G H I J T S R Q P O N M L K 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 OR Deciduous teeth (A - T) A B C D E F G H I J T S R Q P O N M L K ☻When we use numbers for deciduous teeth we have to put (d) beside the number e.g. # 5d
The universal numbering system
2) Palmer Notation System: It represents the four quadrants of the dentition as if you are facing the patient. Upper right Upper left Lower left Lower right
☻The permanent teeth are numbered from 1-8 on each side from the midline. Upper right Upper left 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 Lower right Lower left 8 8 7 7 6 3 6 5 4 2 1 1 3 4 5 2 8 8 7 4 6 7 6 5 3 4 5 2 2 3 1 1
The deciduous teeth are lettered from A-E on each side from the midline. Upper right Upper left E D C B A A B C D E Lower right Lower left B A C D E E D C B A
Palmer Notation System
3- The Federation Dentaire international (FDI) (Two digit system) The teeth are designed by using binomial systems: The first number of the code is located at the left side and indicates the quadrant. In the permanent dentition. U.R. 1 2 U.L. L.R. 4 3 L.L. In the deciduous dentition. U.R 5 6 U.L. L.R. 8 7 L.L.
☻The two numbers should be pronounced separately. b- The second number is located at the right side and indicates the number of the tooth in the quadrant according to Palmer’s. ☻The two numbers should be pronounced separately. Permanent teeth 18 17 16 15 14 13 12 11 21 22 23 24 25 26 27 28 48 47 46 45 44 43 42 41 31 32 33 34 35 36 37 38
Deciduous teeth 55 54 53 52 51 61 62 63 64 65 85 84 83 82 81 71 72 73 74 75
Thanks and have a nice day