Preclinical Performance of Customized Polycaprolactone-Based Hybrid Bone Grafts

(1) Introduction: Polycaprolactone (PCL) materials have been developed with components that promote bone growth. The main objective of this work was to evaluate the biocompatibility and cytotoxic effects that different combinations of PCL with nanohydroxyapatite and strontium could produce on periodontal ligament stem cells (PDLSC). (2) Materials and Methods: PDLSCs were seeded in six 96-well plates. Three plates were used for the MTT test, and three were used for the Hoechst 33342 test. In each of the plates, three samples of different concentrations of PCL were introduced (PCL 100%, PCL 95% combined with nanohydroxyapatite functionalized with strontium, and PCL 90% with nanohydroxyapatite). Apoptosis was analyzed using Hoechst and cell viability combined with MTT at 24, 48, and 72 h. (3) Results: No statistically significant differences (p < 0.05) were found between the different concentrations of PCL or regarding the duration for which the cells were subjected to elution. (4) Conclusions: Pure PCL and both PCL combined with nanohydroxyapatite/strontium and nanohydroxyapatite are biocompatible materials, and there are no significant differences between them after apoptosis and in cell viability assays.