## Special Issue on \"Active Materials for Medical Applications\"
This confirms the results obtained in previous clinical practice, confirming the validity of the simulation. During orthodontic tooth movements, the morphology of the teeth and of the periodontitis should be taken into account. The effect of orthodontic forces on a particular anatomy can be studied using FEA, a method that provides real data. This is necessary for proper treatment planning and its particularization depends on the patient's particular situation [4]. Other interesting topics of the special materials used in medical field cover the following: Surface Analysis of 3D (SLM) Co-Cr-W Dental Metallic Materials [5], Laser Induced Method to Produce Curcuminoid-Silanol Thin Films for Transdermal Patches Using Irradiation of Turmeric Target [6], Corrosion-Resistance Analysis of HA Layer Deposited through Electrophoresis on Ti4 Al4 Zr Metallic Substrate [7], Magnetic Abrasive Finishing of Beta-Titanium Wire Using Multiple Transfer Movement Method [8], Effect of Alkyl Structure (Straight Chain/Branched Chain/Unsaturation) of C18 Fatty Acid Sodium Soap on Skin Barrier Function [9] or Self-Expandable Retainer for Endoscopic Visualization in the External Auditory Canal: Proof of Concept in Human Cadavers [10]. A new possible method to produce a transdermal patch is proposed [6]. The study refers to the pulsed laser deposition method (PLD) applied on turmeric target in order to obtain thin layers. Under high-power laser irradiation of 532 nm wavelength, thin films containing curcuminoids were obtained on different substrates such as glass and quartz (laboratory investigation) and hemp fabric (practical application). Compared with FTIR, SEM-EDS and LIF analyses proved that the obtained thin-film chemical composition mainly comprises dentinov curcumin and bisdemethoxycurcumin, which is evidence that most of the curcumin from turmeric has been demethylicated during laser ablation. Silanol groups with known roles in dermal reconstruction are evidenced in both turmeric target and curcuminoid thin films. UV-VIS reflection spectra show the same characteristics for all curcuminoid thin films, indicating that the method is reproducible [6]. The method proves to be successful for producing a composite material, namely curcuminoid transdermal patch with silanol groups, using directly turmeric as target in the thin film deposited by pulsed laser techniques. Double-layered patch curcuminoid-silver was produced under this study, proving compatibility between the two deposited layers. The silver layer added on the curcuminoid-silanol layer aimed to increase antiseptic properties relative to the transdermal patch [6]. Titanium is often used in various important applications in transportation and the healthcare industry. The goal of this study was to determine the optimum processing of magnetic abrasives in beta-titanium wire, which is often used in frames for eyeglasses because of its excellent elasticity among titanium alloys [8]. To check the performance of the magnetic abrasive finishing process, the surface roughness (Ra) was measured when the specimen was machined at various rotational speeds (700, 1500 and 2000 rpm) in the presence of diamond pastes of various particle sizes (0.5, 1 and 3 \(\upmu\)m). We concluded that the surface roughness (Ra) was the best at 2000 rpm, 1 \(\upmu\)m particle size and 300 s processing time, and the surface roughness of \(\beta\)-titanium improved from 0.32 to 0.05 \(\upmu\)m. In addition, optimal conditions were used to test the influence of the finishing gap, and it was found that the processing power was superior at a gap of 3 mm than at 5 mm when processing was conducted for 300 s [8]. A study was conducted to investigate the efficacy of a self-expandable retainer (SER) for the endoscopic visualization of the external auditory canal (EAC). Tympanomeatal flap (TMF) elevation was performed in six cadaveric heads. Two different types of SER were placed. Procedural feasibility was assessed by using endoscopic images.