True Cementoma Research Articles

A path less travelled — Short review on ossifying fibroma and osseous dysplasia

Fibro-osseous lesions (FOL) are characterized by replacement of normal bone by fibrous tissue containing a newly formed mineralized product. The mineralized product may be ossification (sometimes cementum formation) or calcification of fibrous tissue by metaplasia. These lesions have similar radiographic and histopathologic features hence the term fibre- osseous lesion is not a diagnosis, rather a description of the presence of fibrous and calcified tissue. They may be developmental (fibrous dysplasia), reactive (cemento-osseous dysplasia) or neoplastic (ossifying/cementifying fibroma). This article presents the commonly used classification for fibro-osseous lesions and an insight into a few changes that have been introduced in the recent past with emphasis on Ossifying Fibroma and Osseous Dysplasia.Ossifying fibromas are considered as benign fibro-osseous neoplasms which are principally encountered within the jawbones. Cemento-osseous dysplasias are non-neoplastic fibro- osseous lesion. Since 1971, the World Health Organization classified cemental lesions into 4 distinct entities, as follows: Periapical Cemental Dysplasia, Benign Cementoblastoma (true cementoma), Cementifying Fibroma and Gigantiform Cementoma (GC). The term, gigantiform cementoma, may imply a solitary process but it is misleading because the condition typically presents as slow-growing, multifocal/multiquadrant and expansile lesions involving both jaws. WHO classified it in Osseous dysplasia and El-Mofty et al. under Ossifying fibroma.

Surgical management of a complicated case of benign cementoblastoma impeding normal occlusion : A case report

True Cementoma or benign Cementoblstoma is a rare odontogenic tumor that represents less than 1% of all reported odontogenic tumors. it was first described as a benign tumour that forms cementum or cementum like tissue mass around the teeth roots and that the only true cemental neoplasms are benign cementoblastoma and cementifying fibroma.Its most common site is the posterior mandible mostly associated with molar and premolar teeth, and it rarely occurs in anterior teeth. It has a higher prevalence in male population and usually occurs before the third decade of life. the literature highlights that the treatment of choice for benign cementoblastoma is surgical removal of both the tumor and associated teeth.In this case report, a case of a 29-year-old male patient with a benign cementoblastoma (true cementoma) in the posterior mandible impeding the path of normal occlusion is presented. Whereby surgical removal of the mass and its histological examination was done to confirm its nature. Although it is a rare neoplasm constituting to less than 1% of benign odontogenic neoplasms, oral and maxillofacial surgeons should be aware of its diagnosis, clinical picture, histopathological features, treatment and prognosis as it may pose a risk to the patient's dentition and bony structures.

下顎大臼歯部に発生した良性セメント芽細胞腫の１例

Benign cementoblastoma is an odontogenic tumor of mesenchymal origin characterized by a mass of cementum-like tissue or cementum. It is also called a “true cementoma” by many workers, and is a rare lesion. This tumor most frequently involves a lower premolar or molar and is contiguous to the tooth root.The lesion described here occurred in a 26-year-old woman. It was located at the level of left lower second molar.

良性セメント芽細胞腫の１例

Benign cementoblastoma is a mesoblastic-odontogenic tumor which shows increased cementum. This tumor has been called “true cementoma” by many workers and is a very rare odontogenic tumor. We recently encountered a case of benign cementoblastoma at the 65 root in a 50-year-old male.Enucleation of the tumor was performed and the bone defect was repaired by an autogenous ilium graft.

Case report 695

A case of a cementifying fibroma in the proximal end of the tibia in a 31-year-old woman is presented. The lesion was expanding but well-defined with amorphous central calcification. The unique, calcified, cementum-like particles in a fibrous stroma have been reported in only four previous cases in long bones. The histological and radiographic differences between a cementifying fibroma, bone cysts with cementum, and a true cementoma are discussed. The radiological differential diagnosis of fibrous dysplasia, giant cell tumor, and low grade central osteosarcoma was considered.

再発をきたした良性セメント芽細胞腫の１例 文献的考察を加えて

Benign cementoblastoma (BC) is considered as an odontogenic tumor of mesenchymal origin characterized by proliferation of cellular cementum, and is also called “true cementoma” by many workers. BC has been considered to be a rare odontogenic tumor, but the number of report on BC is now increasing, and 64 tumors were reported in Japan since 1953. Clinically, BC develops frequently in the lower molar region of comparatively younger generation and usually presents a distinct lesion with characteristic radiographic and pathohistologic appearances. Generally, surgical prognosis of BC is well, though 5 cases with postoperative recurrence have been documented in Japan. The present paper reports a case of BC with postoperative recurrence. The patient was a 20-year-old man who had a thum's tip-sized tumor in his lower left premolar region of the mandible. Clinical and radiographic examination revealed a well circumscribed lesion in the mandible. This tumor was pathologically diagnosed as BC. Twenty four months later, recurrent BC was found. In addition to the above mentioned case, BC cases with or without recurrence were reviewed in the Japanese literatures concerned.

良性セメント芽細胞腫の 1 例

Benign cementoblastoma is a mesoblastic-odontogenic tumor which has an increasing of cementum. This tumor had been called "true cementoma" by many workers. In 1973 Eversole first reported it by the name of benign cementoblastoma. Formerly, this tumor was considered to be a very rare odonogenic tumor, but the number of the reports on it is now increasing. Clinically, this tumor develops in the lower molar region of comparatively younger generation. This tumor usually presents a distinct region with characteristic radiographic and histologic appearances. Lately, we experienced a case of this tumor. The patient was a 12-year-old girl and a swelling as big as a thumb tip was found which had a clear border in her <765>^^^-| region in the oral examination. In pathology, this tumor was diagnosed as benign cementoblastoma.

Endodontic treatment of a cementoblastoma: Report of a case

The benign cementoblastoma (true cementoma, osteoblastoma, giant osteoid osteoma) appears to be a true neoplasm of functional cementoblasts which proliferate at the apex of teeth to form an expansile tumor. It remains intimately attached to the tooth roots and occasionally involves the root canals themselves. Although the pulpal tissue remains vital, treatment has historically consisted of extraction of the involved tooth along with extirpation of the tumor. This mode of therapy for the benign cementoblastoma should not be confused with the entity called periapical cemental dysplasia (that is cementoma, periapical osteofibroma or osteofibrosis, cementifying fibroma, localized fibro-osteoma, and periapical fibrous dysplasia). In this latter lesion the treatment consists of simply recognizing the condition and establishing a schedule for periodic evaluation of the patient. In the case presented here enucleation of the cementoblastoma and endodontic therapy were selected as treatment modalities, despite the presence of buccal and lingual expansion of the cortical plates. There has been no recurrence of this growth during the 4-year follow-up period.

Cement forming tumours of the lower jaw: (Case report)

This publication concerns two cement forming tumours - the centrally cementifying fibroma and the true cementoma. The centrally cementifying fibroma is a rare tumour and has been considered an entity for some time. Our case presents a lesion of a size and a homogeneous histological structure rarely encountered. The operative procedure is also discussed. The progression from the radiolucent to the radio-opaque stage could be observed radiologically in the case of a cementoma.

Benign cementoblastoma (true cementoma)

Two new cases of benign cementoblastoma (true cementoma) are added to the literature. One occurred in a 36-year-old man and the other in a 16-year-old girl. Both odontogenic apical tumors were located at the level of the first and second right lower molars and have not recurred 4 years and 1 year, respectively, after extirpation.

“Cementicles” and fragments of cementum in the periodontal membrane

Cementicles are spherical calcified bodies lying free in the periodontal membrane. They may also be incorporated within the cementum or the alveolar bone or even within the bone marrow spaces of the tension side of drifting or moved teeth. They originate from calcified epithelial rests, from dystrophically calcified connective tissue within the areas of indefinite fibers, from small spicules of cementum or alveolar bone traumatically displaced into the periodontal membrane and modeled by the functional movement of the tooth, from calcified Sharpey's bundles, and eventually from calcified thrombosed vessels within the periodontal membrane. Cementicles undergo deposition of either primary or secondary cementum. They may also show osteoclastic resorption. Occasionally they fracture, but the fragments may become united by callus. The fusion of free cementicles around the apical end is not considered as a true cementoma. Larger parts of cementum found in the periodontal membrane result from trauma. These fragments may become united with the root surface by a bony callus or may be coupled to the root surface by a newly formed periodontal membrane.