Page 272 - IJB-10-5

International Journal of Bioprinting A TPMS framework for complete dentures

Table 5. Selective laser melting (SLM) processing parameters for Ti6Al4V alloy powder
Laser power (W) Scanning speed (mm/s) Spot size (μm) Layer thickness (μm) Hatch spacing (μm)
150 650 100 60 60
Parameter Specification
Laser power (W) 150
Scanning speed (mm/s) 650
Spot size (µm) 100
Layer thickness (µm) 60
Hatch spacing (µm) 60

An electronic analytical balance and a vernier caliper
were used to measure the weight and size of the static
compression test samples, respectively. Based on the
measurements, the relative density of the samples was
then calculated using the weighing method to evaluate
printing accuracy.
The surface morphology of the samples was obtained
using scanning electron microscopy (SEM; Zeiss Sigma
300; Zeiss, Germany). Subsequently, the samples were
subjected to grinding and polishing to observe micro-
pores and microstructures. The grinding process was
conducted using an automatic polishing machine, followed
by multiple polishing steps using different sandpapers
(#2000, #2500, and #3000) to achieve a mirror-like finish.
The samples were etched for ~60 s using a Kroll etchant
to expose the microstructure, then observed using
an ultra-depth 3D microscope (Keyence VHX-7000;
Keyence, Japan).

Teeth experience a wide range of complex forces during
daily occlusal activities, including axial occlusal and
lateral forces. Therefore, porous frameworks must possess
adequate yield and flexural strength. In this regard, static
compression, three-point bending, and impact experiments
were conducted to assess the mechanical performance of
samples, ensuring that the IFCD framework meets the
usage requirements.

At room temperature, the static compression tests
were performed using an electromechanical universal
testing machine (Empyrean; Malvern Panalytical, United
Kingdom [UK]). The experimental sample models and
dimensions are illustrated in Figure 7A. The indenter’s
descent speed was set at 1 mm/min, and the porous stent
was subjected to compression until failure. This test aims
to assess samples’ compressive behavior and yield strength.
Figure 7. Models and dimensions of samples for mechanical experiments:
The Charpy impact test was employed to evaluate the (A) quasi-static compression tests, (B) impact tests, and (C) three-point
impact toughness of the porous samples. The experimental bending experiments.

Volume 10 Issue 5 (2024) 264 doi: 10.36922/ijb.3453