Table 3.
Different hybrid reinforcement materials
| Hybrid type | Hybrid materials |
| Fibers | Glass fiber + polyethylene fibers7 |
| Fillers | – Al2O3 + ZrO 114,109 |
| – ABWs + Al2O3115,108 | |
| – ZrO2−TiO2116 | |
| Fibers + fillers | – Polyester fiber reinforced PMMA + (clay, glass powder, SiO2, or ZrO2)112 |
| – Al2O3 + plasma-treated polypropylene fiber113 | |
| nHA particles, micro-zirconia, glass fiber, and Kevlar fiber | |
| (PMMA-nHA and glass fiber), (PMMA-ZrO2 and glass fiber) | |
| (PMMA-nHA and Kevlar fiber), (PMMA-ZrO2 and Kevlar fiber)48 |
Abbreviations: ABW, aluminum borate whisker; nHA, nano-hydroxyapatite; PMMA, poly(methyl methacrylate).