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To evaluate the trueness of two techniques for transferring the position of implants, with respect to the angles and distances between them, in completely edentulous arches rehabilitated with 3 and 4 implants. All patients were subjected to 2 impressions techniques: solid index (SI) and conventional impression using the open tray (MC) technique. The cast models were digitized by a laboratory scanner, and the generated STL files were imported into engineering software to measure the axes of the coordinates of the implants and the distances between the implants. The Wilcoxon test was used to identify the differences between the SI and MC groups (p<0.05). The Spearman correlation coefficient was applied to identify the correlation between the coordinate axes and the distances between the implants (p<0.05). When comparing the SI and MC groups, a significant difference was observed in the x-axis of implant #1, for the arches with 3 and 4 implants (p<0.05). As for the distances, a significant difference was observed between implants 1-2 in the arches with 4 implants (p<0.05). No correlation was identified between the two dependent variables. The SI, as well as the MC, must be developed to obtain a passive adjustment framework. I.The impression techniques and materials, 4,7 impression copings, presence or absence of splinting, as well as the splint material and the number and angulations of the implants 4,8 are factors that affect the transfer precision of the position of the implants to the mold and later to the

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The introduction of computer-aided design and computer-aided manufacturing in rehabilitation with removable partial denture, enabled the emergence of new methods of fabrication of the framework and materials. In view of this, polyether-ether-ketone appears as an alternative to Cobalt-Chromium, due to its aesthetic properties, high resistance and for being non-allergic. In this sense, the present study aimed to report a clinical case where the framework of a removable partial denture was manufactured from a digital workflow, using polyether-ether-ketone as the material of choice, compared to a removable partial denture made with a cobalt-chromium framework. In this case, it was possible to perceive that the use of computer-aided design and computer-aided manufacturing technology for the construction of a removable partial denture framework of polyether-ether-ketone resulted in a denture with adequate adaptation and good aesthetics. Patient satisfaction, comfort, retention, number of follow-up sessions, masticatory performance and quality of life were evaluated. Compared with the conventional denture, the polyether-ether-ketone framework denture provided better satisfaction and comfort. Both prostheses showed similar results in terms of masticatory performance and in terms of quality of life, however the polyether-ether-ketone framework denture showed better results. In conclusion, polyether-ether-ketone proved to be a viable material for making removable partial denture framework. However, controlled and randomized clinical trials are needed to demonstrate the benefits of this treatment as an alternative in relation to the conventional denture.