Osteoma is a benign tumour consisting of mature bone tissue. It is an uncommon lesion that occurs in the bones of the craniofacial complex. Only a few cases involving the temporomandibular joint have been reported. An osteoma of the left temporomandibular joint causing limited mouth opening in a 22-year-old man with CT findings revealing the unusual possibility in differential diagnosis of trismus.

From this study we conclude that depending upon the histopathological type different amount of adjoining bone is resected to get the safe margin and based upon the result it is recommended to remain a bit aggressive in maxillary lesions.

The term calcifying odontogenic cyst was first introduced by Gorlin in 1962 (Eshghyar et al., Acta Med Iran 44(1):59-62, 2006. The lesion is unusual in that it has some features of a cyst but also has many characteristics of a solid neoplasm (Cysts and tumors of odontogenic origin: textbook of oral pathology, 2006). It is classified into two types-Type I-the cystic variant, Type II-solid tumor variant. This case report present Type I B-odontome producing intraosseous calcifying odontogenic cyst and Type I C-with ameloblastomatous proliferation in a 19 years old male patient in the right maxillary quadrant. The lesion involved an unerupted permanent maxillary central incisor, which was displaced to the infraorbital ridge of right side and the radiograph revealed a calcified mass in the periapical region of right incisor that was later recognized histopathologically as complex composite odontoma. The lesion was removed surgically. This case report emphasizes on the presence of this Type I B and C lesion and the need to keep them in follow up.