Journal of dental sciences
Physico-mechanical properties and Streptococcus mutans biofilm formation of bio-based flexible crowns versus stainless steel and zirconia crowns for pediatric full-coverage restorations
By Peng TY, Lai SY, Wu YA and 3 others.
Abstract
Background/purpose
Bio-based flexible (BFX) have recently emerged as a potential alternative to conventional pediatric full-coverage restorations, but evidence regarding their properties and microbial behavior remains limited. Thus, this study aimed to evaluate the physico-mechanical properties and microbial behavior of BFX crown compared with stainless steel crowns (SSC) and zirconia crowns (ZRC) for pediatric full-coverage restorations.
Materials and methods
Mandibular primary molar crowns from BFX, SSC, and ZRC were assessed. Weight was measured using an electronic balance, and surface roughness and topography were evaluated using a stylus profilometer and atomic force microscopy. The arithmetic mean roughness (Ra) and root mean square roughness (Rq) were determined. Compressive strength was assessed using a universal testing machine, and deformation was quantified as the root mean square (RMS) deviation from three-dimensional scans. Streptococcus mutans (S. mutans) biofilm formation was quantified using crystal violet staining, with optical density measured at 490 nm (OD490) at 24 and 48 h. Data were analyzed using one-way analysis of variance with Tukey's post hoc test (α = 0.05).