The dentigerous cyst is reported to be one of the most common odontogenic cyst, of developmental origin, which is characterized by its association with an impacted tooth. Often assymptomatic, the dentigerous cyst presents as a well-limited unilocular radiolucent image surrounding the crown of an unerupted or impacted tooth. Decompression is a conservative treatment option for dentigerous cysts, used especially in children, to preserve the cyst associated tooth, promote its eruption and to avoid lesions of the mandibular canal. This report presents a mandibular dentigerous cyst associated with the 35 impacted tooth in a 12-year-old girl. The dentigerous cyst was successfully treated by surgical decompression.

Simple bone cysts (SBCs) of the jaws are benign intraosseous cavities empty or filled with serous, serohematic or blood fluid. They are characterized by the absence of an epithelial lining. Aim: To describe the clinical, radiographic and surgical findings of SBC through a series of 4 clinical cases and a literature review of previously published cases. Methods: A series of 4 case reports of our department were reported with presentation of the clinical, radiological and surgical investigations performed. In addition, a literature search of SBCs was conducted using the PubMed database for a period of 10 years. Results: 19 papers were returned; A total of 34 patients (including our 4 patients) with a total of 40 lesions were analyzed. SBC are generally observed around the second decade of life (68%) without gender predominance. They are preferentially located in the mandible and are frequently asymptomatic and of fortuitous discovery (82%). Radiologically, SBCs can be unilocular or multilocular with a characteristic scalloped appearance between the roots of the teeth. The management of these pseudocysts is based on surgical treatment. Discussion: Knowledge of these different characteristics of SBCs is essential to make the right diagnosis and to provide the best management, especially as these lesions may have similarities with other lesions considered more aggressive.

Although rare, the association between simple bone cysts and cemento-osseous dysplasia is very important to know. It is essential to be able to establish a correct diagnosis through regular follow-up to detect clinical and radiological changes of this entity over time and to be able to intervene when necessary.

MTA® is considered as the biomaterial of choice because of its excellent characteristics. Biodentine™ has been introduced into periapical surgery and has proven its efficacity in sealing root-end cavities. Despite of the desirable properties of BiodentineTM, there are limited published cases that described the use of BiodentineTM in periapical surgery.

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