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DENTAL NUMBERING SYSTEMS
There are three different numbering systems used to identify the teeth in dentistry.
1.The Universal Numbering System has been adopted by the ADA and is in use by mostgeneral dentists today.Tooth number 1 is the tooth farthest back on the right side of your mouth in the upper (max-illary) jaw. Numbering continues along your upper teeth toward the front and across to thetooth farthest back on the top left side number 16.The numbers continue by dropping downto the lower (mandibular) jaw. Number 17 is the tooth farthest back on the left side of yourmouth on the bottom. Numbering continues again toward the front and across to the toothfarthest back on the bottom right side of you mouth number 32. In this system, the teeth thatshould be there are numbered. If you are missing your third molars, your first number will be 2instead of 1, acknowledging the missing tooth. If you’ve had teeth removed or teeth missing,the missing teeth will be numbered as well.
2.The Palmer Notation Numbering System is used by some orthodontists, pedodontists,and oral surgeons. Originally called the Zsigmondy system after an Austrian dentist of thatname who developed the idea in 1861.The mouth is divided into four sections called quadrants.The numbers 1 through 8 and aunique symbol is used to identify the teeth in each quadrant.The numbering runs from thecenter of the mouth to the back. In the upper right quadrant tooth, number 1 is the incisor.The numbers continue to the right and back to tooth number 8, which is the third molar.Thenumbers sit inside an L-shaped symbol used to identify the quadrant.The L is right side up forthe teeth in the upper right quadrant.The teeth in the upper left use a backwards L. For thebottom quadrants, the L is upside down following the same pattern from the uppers. Letterssuch as UR or URQ for the upper right or upper right quadrant may also identify the quad-rants.
3.The Federation Dentaire Internationale Numbering System (FDI). Internationallythe two- digit system is used worldwide. Every branch of dentistry uses this system.Each quadrant is assigned a number.The maxillary right quadrant is assigned the number 1, themaxillary left quadrant is assigned the number 2, the mandibular left quadrant is assigned thenumber 3, and the mandibular right quadrant is assigned the number 4.The teeth within eachquadrant are assigned a number from 1 through 8 with 1 being the central incisor and 8 beingthe third molar.
DENTAL NUMBERING SYSTEMSPermanent Teeth
There are three different numbering systems used to identify the teeth in dentistry.
The Universal Numbering System was adopted by the ADA and is in use by most generaldentists today.Tooth number 1 is the tooth farthest back on the right side of the mouth in the upper (maxillary) jaw. Numbering continues along the upper teeth toward the front and across to thetooth farthest back on the top left side number 16.The numbers continue by dropping downto the lower (mandibular) jaw. Number 17 is the tooth farthest back on the left side of themouth on the bottom. Numbering continues again toward the front and across to the toothfarthest back on the bottom right side of the mouth number 32. In this system, the teeth thatshould be there are numbered. If you are missing your third molars, your first number will be 2 instead of 1, acknowledging the missing tooth. If you’ve had teeth removed or teeth missing, the missing teeth will be numbered as well.
The Palmer Notation Numbering System is used by some orthodontists, pedodontists,and oral surgeons. Originally called the Zsigmondy system after an Austrian dentist of thatname who developed the idea in 1861.The mouth is divided into four sections called quadrants.The numbers 1 through 8 and aunique symbol is used to identify the teeth in each quadrant.The numbering runs from thecenter of the mouth to the back. In the upper right quadrant tooth, number 1 is the incisor.The numbers continue to the right and back to tooth number 8, which is the third molar.Thenumbers sit inside an L-shaped symbol used to identify the quadrant.The L is right side up forthe teeth in the upper left quadrant.The teeth in the upper right use a backwards L. For thebottom quadrants, the L is upside down following the same pattern from the uppers. Letterssuch as UR or URQ for the upper right or upper right quadrant may also identify the quadrants.
The Federation Dentaire Internationale Numbering System (FDI). Internationally thetwo-digit system is used worldwide. Every branch of dentistry uses this system.Each quadrant is assigned a number.The maxillary right quadrant is assigned the number 1, themaxillary left quadrant is assigned the number 2, the mandibular left quadrant is assigned thenumber 3, and the mandibular right quadrant is assigned the number 4.The teeth within eachquadrant are assigned a number from 1 through 8 with 1 being the central incisor and 8 beingthe third molar.
Justi Educational DepartmentDental Numbering Systems Perm - Rev. 9/03
DENTAL NUMBERING SYSTEMSILLUSTRATED
Justi Educational DepartmentDental Numbering Systems Perm - Rev. 9/03
32
31
30
29
28
2726 25
17
18
19
20
21
22
2423
Lower(mandibular)
Upper(maxillary)
(R) ThirdMolar
8
LE
FT
RIG
HT
48
7
6
5
4
3
21
47
46
45
44
43
4241
38
37
8
7
6
5
4
3
21
36
35
34
33
3231
1818
2717
3616
4515
54
146
313 7
212
8
1
11
16 288
15 277
14266
13255
1224
4
11
233
10
2229
211
FD
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PAL
ME
R
UN
IVE
RSA
L
FD
I
PAL
ME
R
UN
IVE
RSA
L
(R) SecondMolar
(R) FirstMolar
(R) SecondBicuspid
(R) FirstBicuspid
(R) Cuspid
(R) LateralIncisor
(R) CentralIncisor
(L) ThirdMolar
(L) SecondMolar
(L) FirstMolar
(L) SecondBicuspid
(L) FirstBicuspid
(L) CentralIncisor
(L) LateralIncisor
(L) Cuspid
(R) ThirdMolar
(L) ThirdMolar
(R) SecondMolar
(L) SecondMolar
(R) FirstMolar
(L) FirstMolar
(R) SecondBicuspid
(L) SecondBicuspid
(R) FirstBicuspid
(L) FirstBicuspid
(R) Cuspid (L) Cuspid
(R) LateralIncisor
(L) LateralIncisor
(R) CentralIncisor
(L) CentralIncisor
2PPERMANENTERMANENT TTEETHEETH
