Purpose/aim: Selective Laser Melting (SLM) technology used for the production of a full-arch prosthetic restoration on implants generates geometry inaccuracies and surface roughness, which do not fulfill clinical requirements, with biological consequences on the osteointegration of implants. Modern approach to Additive Manufacturing (AM) for precision production integrates SLM and milling techniques in the so-called hybrid manufacturing process to produce a more accurate interface to implant. Materials and methods: The virtual (CAD) model of the framework was designed as for a full-arch prosthetic rehabilitation and served as the control of the experiment. Directly from the framework CAD model, eighteen specimens were produced by two different manufacturing centers using hybrid technology, (lab #1 and lab #2). This is a recently introduced productive process, which integrates the SLM, for the production of a semi-finished framework, and the milling technique, for the finishing operation at the interface to implant. Measurements of the frameworks were made in vitro according to a metrological approach that uses an opto-mechanical coordinate measuring machine (OCMM), a CAD-based reconstruction of actual interface, and a geometric error analysis to describe manufacturing inaccuracies. Each implant platform of framework was reduced to its center for the calculation of the relative (between implants) and absolute distances (between manufactured framework and its CAD model). Results:The relative 3D distances between implant platforms showed a mean error varying from 0 to 25!m for lab #1 and 0 to 38!m for lab #2; the 3D mean position error of the implant platforms with respect to the CAD modelwas 8–16!m for lab #1 and 9–22!mfor lab #2. No statistically significant difference was registered between the two groups. Considering both groups, the absolute values of inaccuracy were between 0.011mm and 0.019mm±0.005–0.010mm (SD). Conclusions:The hybrid technology used for the manufacturing of the metal framework for an implant-supported full-arch restoration showed acceptable levels of accuracy, regardless the specific hybrid system. Using the hybrid technology, the geometric error generated during the framework production is lower than 22!m, which is comparable to errors shown in the literature for direct CAD-CAM manufacturing from metal blanks.
Hybrid manufacturing of metal framework for full arch dental restoration / Ciocca, L; Parisi, C; Meneghello, R; Monaco, C; Baldissara, P. - (2017), pp. e62-e62. (Intervento presentato al convegno Academy of Dental Materials tenutosi a Nuremberg, Germany nel 05–07 October 2017) [10.1016/j.dental.2017.08.123].
Hybrid manufacturing of metal framework for full arch dental restoration
C Monaco;
2017
Abstract
Purpose/aim: Selective Laser Melting (SLM) technology used for the production of a full-arch prosthetic restoration on implants generates geometry inaccuracies and surface roughness, which do not fulfill clinical requirements, with biological consequences on the osteointegration of implants. Modern approach to Additive Manufacturing (AM) for precision production integrates SLM and milling techniques in the so-called hybrid manufacturing process to produce a more accurate interface to implant. Materials and methods: The virtual (CAD) model of the framework was designed as for a full-arch prosthetic rehabilitation and served as the control of the experiment. Directly from the framework CAD model, eighteen specimens were produced by two different manufacturing centers using hybrid technology, (lab #1 and lab #2). This is a recently introduced productive process, which integrates the SLM, for the production of a semi-finished framework, and the milling technique, for the finishing operation at the interface to implant. Measurements of the frameworks were made in vitro according to a metrological approach that uses an opto-mechanical coordinate measuring machine (OCMM), a CAD-based reconstruction of actual interface, and a geometric error analysis to describe manufacturing inaccuracies. Each implant platform of framework was reduced to its center for the calculation of the relative (between implants) and absolute distances (between manufactured framework and its CAD model). Results:The relative 3D distances between implant platforms showed a mean error varying from 0 to 25!m for lab #1 and 0 to 38!m for lab #2; the 3D mean position error of the implant platforms with respect to the CAD modelwas 8–16!m for lab #1 and 9–22!mfor lab #2. No statistically significant difference was registered between the two groups. Considering both groups, the absolute values of inaccuracy were between 0.011mm and 0.019mm±0.005–0.010mm (SD). Conclusions:The hybrid technology used for the manufacturing of the metal framework for an implant-supported full-arch restoration showed acceptable levels of accuracy, regardless the specific hybrid system. Using the hybrid technology, the geometric error generated during the framework production is lower than 22!m, which is comparable to errors shown in the literature for direct CAD-CAM manufacturing from metal blanks.
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