当前位置： SCI文献检索 > JOURNAL OF DENTISTRY期刊下所有文献 > Impact of light transmittance mode on polymerisation kinetics in bulk-fill resin-based composites.

Impact of light transmittance mode on polymerisation kinetics in bulk-fill resin-based composites.

Abstract：

OBJECTIVES:to determine the mode of light transmission and its impact on the polymerisation kinetic in modern bulk-fill resin-based composites (B-RBC). MATERIALS AND METHODS:Four low-viscosity methacrylate-based and one high-viscosity ormocer-based B-RBCs were considered. One material was available in three different shades that were all analyzed. Polymerization kinetic and light transmittance were assessed in 2 and 4mm specimen depths. Incident and transmitted irradiance and radiant exposure were measured in real-time on a laboratory-grade spectrometer. RESULTS:A progressive enhanced light transmittance during polymerisation was identified in all materials except for TetricEvoFlow BulkFill, which became progressively opaque in all shades. One-way ANOVA and multivariate analysis (α=0.05) were performed. The parameter material has a significant (p<0.001) effect on DC (ηP2=0.856) and light transmittance parameters (irradiance, ηP2=0.965; radiant exposure, ηP2=0.956); specimen depth influences only transmittance (ηP2=0.978; 0.980). DC variation in time was best described by an exponential sum function (R2>0.95), differentiating between the gel- and the glass-phase and revealing a faster initiation of polymerization and a slower transition into the glass-phase by lowering the filler volume. Depth retarded the transition into the glass-phase, but did not alter DC measured 300s post-irradiation. Moderate inverse correlation was identified among DC and filler volume% (-0.646) or filler weight% (-0.403), while no correlation among DC and light transmittance (p=0.141; 0.125). The maximal rate of carbon-carbon double bond conversion varied within the analyzed materials but was independent from specimen's depths. CONCLUSIONS:Light transmission changes during polymerization do not alter polymerization kinetics in modern B-RBCs. DC 300s post-irradiation was maintained with depth, while light was attenuated, the faster the more translucent the material was. DC and quality of curing cannot be related to light transmittance in B-RBCs.

journal_name

J Dent

journal_title

Journal of dentistry

authors

Ilie N

doi

10.1016/j.jdent.2017.05.017

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

51-59

eissn

0300-5712

issn

1879-176X

pii

S0300-5712(17)30127-6

journal_volume

pub_type

杂志文章

在线工具

Impact of light transmittance mode on polymerisation kinetics in bulk-fill resin-based composites.