Possibilities of 3D printer Rapidshape D30 for manufacturing of cubic samples

Abstract

The purpose of the present paper is to establish experimentally the possibilities of the 3D printer Rapidshape D30 for the manufacturing of standard cubic samples from different types of monomers and to evaluate their geometrical accuracy and roughness.Standard cubic samples with dimensions 5mm х 5mm х 5mm were printed from all the materials, given by the producer, in two ways of dimensional orientation according to the base -horizontally and inclined at 45 о . They were manufactured with 3D printer Rapidshape D30, working on a stereolithography principle with LED light. It was established that:❖ The samples, made of NextDent Surgical Guide, have the highest dimensional accuracy and the lowest deviation interval in both ways of placement. This polymer is characterized with the highest thickness of the polymerization layer -0.100 mm, but it is transparent, thus ensuring the entire polymerization throughout the depth of the whole layer. NextDent C+B, intended for manufacturing of temporary crowns and bridges, occupies a middle position in comparison to the other 6 materials.❖ Nearly in all the materials the surface roughness of the cube with horizontal placement is lower than that of the cube printed inclined (average values of Ra 0.46-2.69µm and Ra 1.74-2.77, respectively).❖ In 3D printing the surface roughness depends on the thickness of the polymerization layer and the inclination to the printing direction. The thicker the polymerization layer and the larger the slope, the higher the surface roughness.

Production of high-quality temporary crowns and bridges by stereolithography

“…It has been found in our previous research (14,15) that the surfaces, parallel to the printer's basis, are characterized by the lowest roughness, followed by these, parallel to the printing direction (Z-axes). For polymeric samples of NextDent C+B, printed with 50 μm thickness, the Ra values are in the range 1.35-1.80 μm.…”

“…The temporary crowns and bridges can be fabricated by printer RapidShape D30 using NextDent C+B polymer, which is designed especially for these purposes. It has been established in our previous in-vestigations (14)(15)(16) that the samples, 3D printed with a lower layer thickness of 35 μm, are characterized by the highest dimensional accuracy and smoothness of the surfaces. The duration of the process for their production is 59 min for cubic samples and 122 min for dental bridges, which is two times longer compared to printing a 50 μm layer (recommended by the producer) -35 min and 68 min, respectively.…”

“…The surface roughness was studied through measurement of its average arithmetic deviation Ra via profile meter Taylor Hobson Surtronik 3. More detailed information about the specimens' fabrication and measurements can be found in the works of Dikova T. et al (14)(15)(16).…”

Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies

“…The higher roughness of the surfaces, parallel, or inclined to the print direction (Z axes), compared to that along X and Y axes is also established in the research of Dikova et al [46]. Their investigations of cubic samples, printed with diferent polymers by DLP SLA, show that the roughness of the surfaces of the cubes with horizontal position toward the basis is less than those of the cubes, printed inclined in almost all types of polymers.…”

“…They established that the roughness along the tooth axis of the crown created by laser-assisted SLA was the smallest, while that along the horizontal direction of the crown printed by multi-jet modeling (MJM) was the smallest. This can be explained with the speciic features of the additive manufacturing process [8,12,45].The higher roughness of the surfaces, parallel, or inclined to the print direction (Z axes), compared to that along X and Y axes is also established in the research of Dikova et al [46]. Their investigations of cubic samples, printed with diferent polymers by DLP SLA, show that the roughness of the surfaces of the cubes with horizontal position toward the basis is less than those of the cubes, printed inclined in almost all types of polymers.…”