## 1 Introduction
[27] studied Zn-containing bioglasses synthesized by the melt-quenching route, within SiO\({}_{2}\)-P\({}_{2}\)O\({}_{5}\)-Na\({}_{2}\)O-K\({}_{2}\)O-CaO-MgO-SrO-ZnO system, ZnO substituting MgO; they concluded that Zn induces an antibacterial effect, hinders glass crystallization and retards apatite precipitation. Magnesium (Mg) is a very interesting element as a component of bioglasses, manifesting its effects at the level of glass processability (crystallization avoidance or delay), mechanical properties' enhancement, bioactivity improvement and angiogenesis stimulation [28]. [PERSON] et al. [29] reported obtaining Mg-including bioglasses through the conventional approach, within the Na\({}_{2}\)O-CaO-MgO-SiO\({}_{2}\)-P\({}_{2}\)O\({}_{5}\) system, with MgO replacing CaO; the findings can be summarised as follows: Mg-rich compositions are characterized by a lower glass transition temperature, a higher crystallization temperature and attenuated rate of conversion of the initially emerged amorphous calcium phosphate to a crystalline apatite layer. Strontium (Sr) is an element that has enjoyed special attention recently due to its beneficial influence on cell proliferation and differentiation, bacteria apoptosis, osteogenesis and bone reconstruction speed [30]. [PERSON] et al. [31] prepared Sr-containing bioglasses by the sol-gel method, within the SiO\({}_{2}\)-CaO-SrO-P\({}_{2}\)O\({}_{5}\) system, with SrO substituting CaO; the results showed that Sr does not structurally alter the glass network and stimulates bone cells' production of alkaline phosphatase. Moreover, [PERSON] and [PERSON] [32] demonstrated that the replacement of CaO with SrO in relation to the previous oxide system brings significant changes: enhanced tendency towards crystallization, accelerated formation of apatite and increased metabolic activity of osteoblasts as Sr content increases. The sol-gel method is an appropriate experimental means of tissue engineering applications, with the positive effects being multiple: versatile composition, facile processing and improved bioactivity [33; 34]. Through this type of approach, all kinds of dimensionalities (particles, fibres, coatings, scaffolds, massive bodies, etc.) can be built [35; 36]. A careful control of the determiningparameters is enough to adjust the final properties and define the functional performances. Afterwards, the deposition of thin films on metallic substrates can be done by different techniques: spraying, sputtering, ablation, centrifugation, etc. [37; 38; 39; 40]. Pulsed laser deposition (PLD) is such an alternative, involving the ablation of one or more targets with a pulsed laser beam, followed by material transfer via plasma at the surface of a support; stoichiometry preservation and lack of contamination are the most representative assets [41]. Spin coating (SC) is another option for growing one-dimensional structures from a precursor solution that is rotated at high speed on the surface of a substrate; experimental simplicity and thickness control constitute its gains [42]. Our research group reported on several complex oxide systems, which were processed by sol-gel, spin coating and pulsed laser deposition as bioactive and biocompatible coatings [6; 8; 16; 41; 42], leading to considerable expertise in the field. In this work, novel compositions including Mg or Sr were tested in the form of thin films for providing suitable materials to coat the bioinert ceramic or metallic bone implants, ensure a biologically active interface and subsequently triggering speeded and superior osseointegration of them within the afflicted body.