Table 1.

Databases searched and the key words.

Database	Keywords
PubMed	“nano-Poly(D,L-lactic acid)”, “PLA”, “zinc oxide”, “ZnO”, “nanofiller”, “denture base resins”, “antimicrobial properties”, “mechanical performance”
Scopus	“nano-PLA”, “zinc oxide nanoparticles”, “ZnO”, “nanocomposite”, “denture resins”, “antibacterial properties”, “mechanical strength”, “dental materials”
Web of Science	“poly(D,L-lactic acid) nanocomposites”, “PLA”, “ZnO”, “nanoparticles”, “denture base materials”, “antimicrobial efficacy”, “mechanical properties”
Cochrane Library	“PLA nanocomposites”, “zinc oxide nanofiller”, “ZnO”, “denture base resins”, “antimicrobial activity”, “mechanical properties”, “dental prosthetics”
Embase	“nano-Poly(D,L-lactic acid)”, “PLA”, “zinc oxide”, “ZnO nanocomposite”, “denture base materials”, “antibacterial performance”, “mechanical properties”, “dental applications”
Google Scholar	“PLA/ZnO nanocomposites”, “zinc oxide nanofiller”, “ZnO nanoparticles”, “denture resins”, “antimicrobial properties”, “mechanical performance”, “nanotechnology in dentistry”