Geometrical Precision and Surface Topography of mSLA-Produced Surgical Guides for the Knee Joint

Abstract

In this study, the precision of anatomical models and surgical guides pertaining to the knee joint, fabricated using the mSLA technique, was critically examined. The ITK-SNAP program was employed for the segmentation and reconstruction of knee joint anatomical structures, while surgical guide modelling was executed using the Siemens NX program. Subsequent fabrication of the models was accomplished with the Anycubic Photon Mono 4K MSLA 3D printer. An MCA II articulated arm equipped with a laser head, in conjunction with a TalyScan 150 profilometer, was utilized to gauge both the geometrical fidelity and surface roughness of the resulting models. Results indicated that the geometrical precision of these models remained within a tolerance of +/-0.3 mm. With regard to surface roughness, the Sa parameter was observed to lie between 2 and 2.5 µm.

The Process of Digital Data Flow in RE/CAD/RP/CAI Systems Concerning Planning Surgical Procedures in the Craniofacial Area

“…MountainsMap software was used to determine the surface roughness parameters [27]. First, a filtering process was performed to remove the obtained shape deviations.…”

“…However, preparing implants or surgical templates requires high surface and solid modeling skills. Crucial at this stage is the proper alignment of the designed models with the geometry of the anatomical structure [26,27]. This process is time-consuming since bony structures are not symmetrical in the sagittal plane.…”

“…The process of evaluating geometric accuracy was carried out on manufactured prototypes of surgical plates made of ABS+, CPE, PLA+, and PETG materials. A 7-axis MCA II coordinate measuring arm with a measurement range of 1.8 m, equipped with MMD × 100 laser heads, was used for this purpose [26,27] (Figure 8). The measurement plan was determined using Focus Handheld software.…”

“…The manufactured surgical plate was subjected to surface roughness measurement on a TalyScan 150 measuring machine [27] (Figure 9). In the process of evaluating the surface roughness of surgical templates made of ABS+, CPE, PLA+, and PETG material, a sampling step in the X and Y axes was set equal to 5 µm.…”

Analysis of the Accuracy of CAD Modeling in Engineering and Medical Industries Based on Measurement Data Using Reverse Engineering Methods

“…The RE process is most often used in the automotive [15,16], aerospace [17,18], or archaeological [19,20] industries. It is also very often used in medicine, for example, in the process of developing the geometry of anatomical structures [21,22], designing surgical instruments [23][24][25], or implants [26]. However, errors arise at each stage of the geometric reconstruction process [12,27].…”