RESUMO
OBJECTIVES: This in vitro study focused on verifying the influence of different ambient light conditions on the accuracy and precision of models obtained from digital scans. METHODOLOGY: To measure the tested illuminances: chair light/reflector; room light, and natural light at the time of scanning, a luxmeter was used. From the STL file, nine experimental groups were formed. RESULTS: Of the nine specific combinations between the three IOS and the three types of lighting, it was verified that for all of them, as well as the ICC, the accuracy was also excellent, in which the measured values were not significantly influenced by the IOS brand (p = 0.994) nor by the type of lighting (p = 0.996). For precision data, GLM indicated a statistically significant interaction between IOS and lighting type. Under LS, accuracy was significantly higher with 3Shape® than with CS 3600 CareStream®, which had significantly higher accuracy than Virtuo Vivo™ Straumann®. CONCLUSIONS: The models obtained with the three IOS evaluated exhibited excellent accuracy under the different illuminance tested and the 3Shape® under the three illuminance conditions was the device that presented the best precision, specifically when using LC and LS.
RESUMO
The loss of multiple teeth or trauma to the anterior maxilla often results in a deficient ridge width for prosthetic tooth rehabilitation. This study evaluated the use of titanium mesh and recombinant human bone morphogenetic protein 2 (rhBMP-2) for the repair of major bone defects in the alveolar bone. Five patients were enrolled in the study; these patients required implant replacements for two contiguous missing teeth in the anterior maxilla, which lacked sufficient bone. Residual ridges were augmented with rhBMP-2 and titanium mesh to direct the geometry of the newly formed bone. Seven months later, a bone biopsy specimen was removed from the implantation site before osteotomy and insertion of dental implants. Cone beam computed tomography (CBCT) scans were obtained preoperatively, postoperatively (baseline), and 48 months after implantation to evaluate implant healing. All dental implants were placed in the grafted sites without the need for further bone augmentation. The most frequent adverse effects were facial oedema and oral erythema. Biopsy specimens were used to evaluate bone quality. CBCT scans provided a prediction of alveolar restoration and long-term success. The combination of rhBMP-2 and titanium mesh provided effective augmentation of the atrophic anterior maxilla prior to implant placement.