Numerical simulation and experimentation of endodontic file using Taguchi DoE

The endodontic file is a tapered, needle shape body used for the preparation of curved human root canals. During the preparation, process files get failed due to the locking action offered by the canal wall. The present study aimed to find the fatigue life of endodontic files at 23°, 33° and 43° root canal curvature angles. Four brands of files were selected for the present study viz. Hyplex CM, Pro-Taper Next, Hero Shaper, Pro-File Vortex. The strain life analysis done using ANSYS showed that the Hyplex CM file gives the highest fatigue life at 23°, 33° and 43° root canal curvature angles. Therefore, Hyplex CM file was selected for DoE Taguchi Optimization study. Each experimental reading was conducted on X Smart Plus experimental setup under purely rotary and combined reciprocating-rotary motion, at 500 rpm, 600 rpm and 700 rpm and 23°, 33° and 43° root canal curvature angles. Hyplex CM file given maximum fatigue life at 23° root canal curvature angle and 500 rpm speed of rotation. But if file motion is combined rotary-reciprocating, life reduces. The ANNOVA study showed that P-value and significance F are very small, which represented that the regression model is effective

Amine loaded zeolites for carbon dioxide capture: Amine loading and adsorption studies

Novel functionalised adsorbents have been synthesized by immobilization of various amines on synthetic zeolite 13X. Various primary and secondary amines namely monoethanolamine (MEA), ethylenediamine (ED) and isopropanol amine (IPA) have been immobilized on zeolite 13X. Quantitative estimations of the amine loadings were undertaken using different analytical techniques namely titrimetric, total organic carbon and gas chromatography analysis. Fairly good correlation was obtained for amine loadings estimated using the three techniques. Effect of various parameters like effect of solvent, shaking time, synthesis temperature, and wetting of pellets prior to amine loadings was also studied. The results revealed that maximum loading was achieved for methanol-mediated synthesis conducted using previously wetted pellets at room temperature and with 15 min of shaking time. Preliminary attempts have also been made to determine the CO2 adsorption capacities of these newly developed materials. The adsorption capacities obtained were 16.01 mg/g for unmodified zeolite 13X and 19.98, and 22.78 mg/g for zeolite modified with monoethanol amine, and isopropanol amine