Polymerization Shrinkage Evaluation of Restorative Resin-Based Composites Using Fiber Bragg Grating Sensors

Abstract

The purpose of this study was to compare the linear polymerization shrinkage of different restorative resin-based composites (RBCs) using fiber Bragg grating (FBG) sensors. Five RBCs were evaluated: Zirconfill® (ZFL); Aura Bulk-Fill (ABF); Tetric® N-Ceram Bulk-Fill (TBF); FiltekTM Bulk-Fill (FBF); and Admira Fusion-Ormocer® (ADF). Ten samples per resin were produced in standardized custom-made half-gutter silicone molds. Two optical FBG sensors were used to assess temperature and polymerization shrinkage. Light curing was performed for 40 s and polymerization shrinkage was evaluated at 5, 10, 40, 60, 150, and 300 s. Statistical analysis was accomplished for normal distribution (Shapiro-Wilk, p > 0.05). Two-way repeated measures ANOVA with Greenhouse-Geisser correction followed by Bonferroni′s post-hoc test was used to analyze the linear shrinkage data (p < 0.05). ZFL showed the highest linear shrinkage and ADF the lowest. Shrinkage increased for all RBCs until 300 s, where significant differences were found between ADF and all other resins (p < 0.05). Among bulk-fill RBCs, TBF showed the lowest shrinkage value, but not statistically different from FBF. The ADF presented lower linear shrinkage than all other RBCs, and restorative bulk-fill composites exhibited an intermediate behavior.

Antimicrobial agents in dental restorative materials: Effect on polymerization, short‐term drug release and biological impact

“…On one hand, the conventional composite filling materials have shown better mechanical behavior than the ormocer-based materials regarding flexural strength and fracture toughness, both initially and after storage in distilled water [30]. On the other hand, the polymerization shrinkage of the ormocer-based materials was lower and the biocompatibility better owing to the fact that the ormocer-based materials do not release monomers [31][32][33]. Nevertheless, the ormocerbased materials showed a higher susceptibility to mechanical degradation effects under aqueous condition [30,34].…”

Evaluation of Efficiency of Polymerization, Surface Roughness, Porosity and Adaptation of Flowable and Sculptable Bulk Fill Composite Resins

“…The negative effects of polymerization stress (e.g., cusp deflection, marginal gap and dentinal defect formation) can be minimized by using multiple layering techniques and different methods of light polymerization [ 3 ]. Since incremental layering and stratifying techniques are time-consuming and technique-sensitive, recently, a new category of ‘bulk fill’ CRs has been developed to enable the clinician to place restorations up to 4 mm thick without negatively affecting the cavity adaptation, shrinkage and efficiency of polymerization [ 4 ].…”

Curing depth and degree of conversion of different nano-hybrid composites

“…This might be due to the fact that Ormocer encompasses inorganic-organic co-polymers with inorganic silanated fillers. Sol-gel technique creates hydrolysis and condensation of alkoxides, an inorganic Si-O-Si network formed by a long inorganic silica chain cornerstone with organic lateral chains, which can react during polymerization procedure using conventional photo-initiators [26].…”