Effect of curing protocol on the polymerization of dual-cured resin cements.
OBJECTIVE
The purpose of this study was to evaluate how curing protocol affects the extent of polymerization of dual-cured resin cements.


METHODS
Four commercial resin cements were used (DuoLink, Panavia F 2.0, Variolink II and Enforce). The extent of polymerization of the resin cements cured under different conditions was measured using a (1)H Stray-Field MRI method, which also enabled to probe molecular mobility in the kHz frequency range.


RESULTS
Resin cements show well distinct behaviours concerning chemical cure. Immediate photo-activation appears to be the best choice for higher filler loaded resin cements (Panavia F 2.0 and Variolink). A photo-activation delay (5 min) did not induce any significant difference in the extent of polymerization of all cements.


CONCLUSIONS
The extent of polymerization of dual-cured resin cements considerably changed among products under various curing protocols. Clinicians should optimize the materials choice taking into account the curing characteristics of the cements.
Pereira
Sónia G
SG
Centro de Química Estrutural, IST (Instituto Superior Técnico), Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal.
Fulgêncio
Rogério
R
Nunes
Teresa G
TG
Toledano
Manuel
M
Osorio
Raquel
R
Carvalho
Ricardo Marins
RM
D006244:Hardness; D007700:Kinetics; D055115:Light-Curing of Dental Adhesives; D008279:Magnetic Resonance Imaging / Q000379:methods; D015394:Molecular Structure; D044367:Phase Transition; D019279:Resin Cements; D055116:Self-Curing of Dental Resins / Q000379:methods*
D019279:Resin Cements