The influence of delayed light curing on the degree of conversion and polymerization contraction stress in dual-cured resin luting agents

Nawaf Labban, Mounir Iskandar, Jeffrey Platt, Carl J. Andres, John A. Levon, Suteera Hovijitra, David T. Brown

Research output: Contribution to journalArticle

Abstract

The aim of the study was to assess the effect of delayed photo-initiation on the polymerization contraction stress (PCS) and degree of conversion (DC) of a dual-cure resin-luting agent. Thirty-five disk (6 mm × 1 mm) samples (n = 10 each group) of dual cure resin luting agent for PCS assessment were fabricated and polymerized using two illuminated quartz rods. Based on the delay in photo-initiation, 30 disks were divided among six groups [group A-0 min (min) delay, group B-2 min, group C-4 min, group D-6 min, group E-8 min and group F-10 min]. A non-photoinitiated group (group G – chemical cure – n = 5) was included as control. The PCS for all specimens was assessed using a Tensometer. For DC evaluation thirty-five specimens were divided into seven groups with delays in photo-initiation (group H-0 min, group I-2 min, group J-4 min, group K-6 min, group L-8 min and group M-10 min, group N-chemical cure). DC was assessed using attenuated total reflectance spectroscopic technique. Statistical comparison among groups was performed using analysis of variance (α = 0.05). The maximum and minimum PCS and DC values with delayed photo-initiation was observed in group-C (3.34 MPa) & group-F (2.44 MPa); and group-M (0.78 MPa) and group-H (0.55 MPa) respectively. Chemically cured samples showed the least PCS (group-G, 1.94) and DC (group-N, 0.53) values in their respective categories. PCS significantly decreased with delayed photo-initiation. A significant increase in DC was noticed when photo-initiation was delayed in the dual cure resin luting agent.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalJournal of Adhesion Science and Technology
DOIs
StateAccepted/In press - Aug 24 2017

Keywords

  • degree of conversion
  • Delayed light curing
  • dual-cured resin
  • luting agents
  • polymerization contraction stress

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'The influence of delayed light curing on the degree of conversion and polymerization contraction stress in dual-cured resin luting agents'. Together they form a unique fingerprint.

  • Cite this