Since the 1970, dental rehabilitation of partially or totally edentulous patients has been an increasingly used practice, due to improved materials and methods and high rates of survival and success. Objective: This study aimed to evaluate patients from the Faculty of Dentistry of the University of Passo Fundo, between 2015 and 2018, with indication and installation of dental implants. Material and methods: Data on age and gender of the patients, indication and region of the implants, technique, type of connection and shape of the implants, bone density, need for grafting and image modality used for surgical planning were collected from dentistry records. Results: In total, 55 patients and 105 implants were evaluated. The age group ranged from 21 to 82 years, and women were the majority group (64%). Among the implant indications, 71% of the patients had only one tooth missing, and the lower first molars comprised most of the implants performed (21%). The conventional surgical technique was the most used (86%), as well as the cylindrical shape cone morse model. Conclusion: The proper selection of indications for implants seeks to be based on scientific evidence, and the protocols are essential to achieve high success rates.

Since the 1970, dental rehabilitation of partially or totally edentulous patients has been an increasingly used practice, due to improved materials and methods and high rates of survival and success. Objective: This study aimed to evaluate patients from the Faculty of Dentistry of the University of Passo Fundo, between 2015 and 2018, with indication and installation of dental implants. Material and methods: Data on age and gender of the patients, indication and region of the implants, technique, type of connection and shape of the implants, bone density, need for grafting and image modality used for surgical planning were collected from dentistry records. Results: In total, 55 patients and 105 implants were evaluated. The age group ranged from 21 to 82 years, and women were the majority group (64%). Among the implant indications, 71% of the patients had only one tooth missing, and the lower first molars comprised most of the implants performed (21%). The conventional surgical technique was the most used (86%), as well as the cylindrical shape cone morse model. Conclusion: The proper selection of indications for implants seeks to be based on scientific evidence, and the protocols are essential to achieve high success rates.

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Background: The use of zirconia-based ceramics to produce monolithic restorations increased due to improvements in the materials optical properties. Traditionally, zirconia-based ceramics were veneered with porcelain or glass-ceramic and were not directly exposed to the oral environment. Therefore, there are several doubts regarding the wear of the monolithic zirconia restoration and their antagonists. Additionally, different surface treatments are recommended to promote a smooth surface, including glaze and several polishing protocols. To support the correct clinical application, it is important to understand the advantages and limitations of each surface treatment. Objective: The aim of this short literature review is to investigate the factors that may affect the wear of monolithic zirconia restorations in service and their antagonists. Method: Pubmed/Medline database was accessed to review the literature from a 10-year period using the keywords: zirconia, monolithic, prosthesis, wear. Both clinical and in vitro studies were included in the review. Results: Studies investigated the effect of several surface treatments, including grinding with diamond-burs, polishing and glazing, on the surface roughness, phase transformation and wear capacity of monolithic zirconia. The wear behavior of monolithic zirconia was frequently compared to the wear behavior of other ceramics, such as feldspathic porcelain, lithium disilicate-based glass-ceramic and leucite-reinforced glass-ceramic. Human tooth, ceramics and resin composites were used as antagonist in the investigations. Only short-term clinical studies are available (up to 2 years). Conclusion: Literature findings suggest that zirconia monolithic restorations are wear resistant and unlikely to cause excessive wear to the antagonist, especially when compared to feldspathic porcelain and glass-ceramics. Monolithic zirconia should be polished rather than glazed. Yet, none of the polishing systems studied was able to completely restore the initial surface conditions of zirconia after being adjusted with burs. More clinical evidence of the antagonist tooth wear potential of monolithic zirconia is needed.

O estudo avaliou a carga de fratura de uma vitrocerâmica de silicato de lítio reforçada por zircônia (ZLS) e uma vitrocerâmica de dissilicato de lítio (LD) condicionadas com ácido fluorídrico 10% por diferentes tempos. Amostras cerâmicas (12 mm x 14 mm x 1,2 mm de espessura) foram obtidas pelo corte de blocos para CAD/CAM. Após a cristalização e o acabamento, as amostras de cada material foram divididas aleatoriamente em 3 grupos (n10) para o condicionamento ácido por 20s (G20), 40s (G40) e 60s (G60), seguido de lavagem sônica e secagem. Bases cilíndricas de resina epóxica reforçada com fibras (NEMA G10) foram confeccionadas. Silano e adesivo foram aplicados sobre a superfície da cerâmica e do G10. Cimento resinoso fotopolimerizavel foi aplicado no centro da cerâmica que foi posicionada sobre a base de G10, e foi fotoativado. Em máquina de ensaios universal e em água destilada a 37ºC, uma força compressiva (0,1 mm/s) foi aplicada por um pistão com ponta plana de 3 mm de diâmetro no centro da cerâmica até o primeiro sinal acústico do início da fratura. O modo de falha foi analisado com transiluminação. Os resultados foram avaliados por Kruskal-Wallis (0,05). Não houve diferença na carga de fratura (N) entre os grupos (p0,1). O modo predominante de falha foi trinca do tipo radial. Somente um corpo-de-prova do grupo G40 de ZLS, sofreu fratura catastrófica com origem de trinca na superfície cerâmica (Hertzian/cone). Portanto, o tempo de condicionamento ácido (20s, 40s e 60s) não influencia a carga de fratura imediata das vitrocerâmicas cimentadas sobre um análogo da dentina.Palavras-chave: Cerâmica. Programa Auxiliado por Computador. Cimentação.