Anatomic variations and lesions of the maxillary sinus were common findings in CBCT exams of the maxilla required for dental implant planning. As some of these conditions can modify dental implant planning and must require specialized treatment, its recognition is noteworthy in dental practice, and especially in implantology. The amount and significance of the anatomic variations and lesions detected in this study reinforces the importance of computed tomography in preoperative dental implant planning.

Introduction: The sinus are very important on the upper respiratory tract, formed by the ostrich complex (COM) and by the paranasal sinuses. The deep knowledge of the anatomy and variations of the ostium-meatal complex and the paranasal sinuses is a skill expected from the radiologist as well the possible variations with the disease states. Objective: The aim of this study was to evaluate the prevalence of anatomic variations and pathological processes in the paranasal sinuses and the ostiomeatal complex in a population of a large city. Furthermore, association among the presence and localization of anatomic variations and the occurrence of pathological processes was also accessed. Materials and Methods: This study evaluated 1005 CT scans of the sinuses obtained by multislice technique (64 apparatus detectors) with axial and coronal reconstructions, both with 1 and 2 mm thick. Patients of both sexes, aged between 12 and 92 years, who were referred by otolaryngologists were included. Results: Our results showed high prevalence of paranasal sinus CT alterations. The most common were: septal deviation (80.7%), concha bullosa (35.1%), Haller cells (9.6%), and ethmoidal bulla (3.3%). Among the pathological processes, mucoperiosteal thickening associated with acute and chronic inflammation of the sinuses were the most frequent. Ocasionally, it caused obstruction of drainage ostiomeatal complex, in addition to sinusitis (acute and chronic). Odontogenic sinusitis, fungal sinusitis, osteomas, fibrous dysplasia and nasal diseases were also found. There was no association among anatomical variations (changes in the nasal septum, bone spur, concha bullosa, nasal turbinate hypertrophy) and increased chances of obstruction of drainage of frontal, ethmoid and maxillary sinuses. Conclusion: Association between obstruction of the drainage and the occurrence of sinusitis on all paranasal sinuses were also detected. As the population has a high frequency of anatomical variations of the paranasal sinuses, the incorrect interpretation of the images of the sinonasal complex should cause misdiagnosis, compromising patient care. In conclusion, knowledge of the prevalence and characteristics of paranasal sinus CT alterations should be useful for defining specific diagnosis criteria.

Upper lateral incisor agenesis is characterized by the absence of dental elements and can be a challenge for professionals regarding treatment possibilities, especially in deciduous dentition where it occurs less frequently. The aim of this report was to describe a case about the agenesis of maxillary lateral incisors in deciduous and permanent dentition. A child of 02 years and 04 months old attended the dental office with his mother. During the evaluation, the mother's main complaint was the aesthetic compromise due to the appearance of her daughter's smile, the radiographic examination was observed in the absence of the deciduous dental elements and permanent germs. This article discusses which treatment alternatives offer better quality of life due to negative aesthetic impact, as well as related social, economic and psychological aspects.

A polpa dos dentes decíduos apresenta-se como fonte promissora de células-tronco. Estas são similares àquelas encontradas no cordão umbilical e quando comparadas às células-tronco provenientes da medula óssea e às da polpa de dentes permanentes, apresentam uma maior taxa de proliferação, além da habilidade de se diferenciarem em células odontoblásticas funcionais, osteócitos, adipócitos e células neurais. O objetivo desse estudo é fazer uma revisão de literatura das células-tronco de dentes decíduos e sua aplicabilidade na Odontologia. Realizou-se um levantamento bibliográfico dos últimos 20 anos, utilizando as bases de dados: PUBMED, SCIELO, MEDLINE, BVS, e GOOGLE ACADÊMICO, utilizando-se as palavras-chave: células-tronco, dentes decíduos, polpa dentária, e suas respectivas palavras em inglês. A literatura aborda principalmente estudos sobre a engenharia tecidual. Dentre os estudos com células tronco dentárias, cerca de cinquenta por cento da literatura diz respeito às células tronco de dentes decíduos. A maioria são estudos laboratoriais in vitro e in vivo que demonstram perspectivas clínicas promissoras como: capacidade de auto-renovação e sua diferenciação em odontoblastos, osteoblastos e cementoblastos. Concluiu-se que os estudos indicam que células tronco de dentes decíduos podem ser viáveis para terapias na regeneração óssea em doenças periodontais, traumas e anodontias, inclusive com o desenvolvimento de biodentes, apontada como uma terceira dentição.