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The annual incidence rates per million for ameloblastomas are 1.96, 1.20, 0.18 and 0.44 for black males, black females, white males and white females respectively. [29] Ameloblastomas account for about one percent of all oral tumors [ 17 ] and about 18% of odontogenic tumors. [ 30 ]
The recurrence rate is 10-15%. [5] Franklin and Pindborg reported a recurrence rate of 14%. [6] It is considered to have a recurrence rate much lower than that of ameloblastoma. Malignant metastasis has been reported. [1]
The following rates describe the number of new cases (for incidence rates) or deaths (for mortality rates) per 100 000 individuals per year. [78] The incidence rate of oral cancer is 2.6 for both sexes. The rate is higher in males at 3.3 and lower in females at 2.0. [78] The mortality rate is lower than the incidence rate at 1.6 for both sexes.
Ameloblastic fibromas contain both of these tissues, and its name is derived from them. It is a neoplasm, meaning it is a mass of abnormal growth of cells or tissue. If the mass contains hard dental tissues they are known as odontoma, which are not true neoplasm, but classified as hamartomatous lesions. [1]
Calcifying odontogenic cyst (COC) is a rare developmental lesion that comes from odontogenic epithelium. [2] It is also known as a calcifying cystic odontogenic tumor, which is a proliferation of odontogenic epithelium and scattered nest of ghost cells and calcifications that may form the lining of a cyst, or present as a solid mass.
Cementoblastoma, or benign cementoblastoma, is a relatively rare benign neoplasm of the cementum of the teeth. It is derived from ectomesenchyme of odontogenic origin, with the formation of cementum-like tissue around the associated tooth root. [2] Cementoblastomas represent less than 0.69–8% of all odontogenic tumors. [2]
Human Tooth Diagram. Cementoma is an odontogenic tumor of cementum.It is usually observed as a benign spherical mass of hard tissue fused to the root of a tooth. [1] It is found most commonly in the mandible in the region of the lower molar teeth, occurring between the ages of 8 and 30 in both sexes with equal frequency . [1]
A teratoma with malignant transformation is a very rare form of teratoma that may contain elements of somatic malignant tumors such as leukemia, carcinoma, or sarcoma. [35] Of 641 children with pure teratoma, nine developed TMT: [ 47 ] five carcinoma, two glioma , and two embryonal carcinoma (here, these last are classified among germ cell tumors).