Classification of Benign Odontogenic Tumors

Benign Odontogenic Tumors can be classified into two Categories.

1: Classification given by Kramer, Pindborg, Shear – 1992
2:  Classification given by Gorlin, Chaudhry, Pindborg – 1961

Here we will describe both of them .

1: Classification given by Kramer, Pindborg, Shear – 1992 
According to this system of classification Benign Odontogenic Tumors are categorized broadly into
A: Odontogenic epithelium without odontogenic ectomesenchyme
B: Odontogenic epithelium with odontogenic ectomesenchyme, with or without dental hard tissue formation
C: Odontogenic ectomesenchyme with or without inclusion

unicystic-ameloblastoma

This 3 classes are further subdivided, which are given as:

A. Odontogenic epithelium without odontogenic ectomesenchyme
1. Ameloblastoma
2. Calcifying epithelial odontogenic tumour –CEOT.
Pindborg tumour
3. Clear cell odontogenic tumour
4. Squamous odontogenic tumour

B. Odontogenic epithelium with odontogenic ectomesenchyme, with or without dental hard tissue formation
1. Ameloblastic fibroma
2. Ameloblastic fibrodentinoma (dentinoma)
3. Odontoameloblastoma
4 Adenomatoid odontogenic tumour (AOT)
5. Complex odontome
6. Compound odontome

C. Odontogenic ectomesenchyme with or without inclusion of odontogenic epithelium
1. Odontogenic fibroma
2. Myxoma (odontogenic myxoma, myxofibroma)
3. Benign cementoblastoma (true cementoma)

And when we talk about classification given by Gorlin, Chaudhry, Pindborg then it will be:
1: Epithelial odontogenic tumors
2: Mesodermal odontogenic tumors

Which are further classified as follow:

1. Epithelial odontogenic tumours
A. Minimal inductive change in connective tissue (Ectodermal origin)
1. Ameloblastoma
2. Adenomatoid odontogenic tumour
3. Calcifying epithelial odotogenic tumour – CEOT

B. Marked inductive change in connective tissue (Mixed origin)
1. Ameloblastic fibroma
2. Ameloblastic odontoma
3. Odontoma
4. Complex odontoma
5. Compound odontoma

2. Mesodermal odontogenic tumours
1. Odontogenic myxoma
2. Odontogenic fibroma
3. Cementoma
a. Periapical cemental dysplasia (PCD)
b. Benign cementoblastoma
c. Cementifying fibroma
d. Familial multiple (gigantiform) cementoma (Florid osseous                  dysplasia – FOD)

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