Optimal depth of cure for nanohybrid resin composite using quartz tungsten halogen and new high intensity light-emitting diode curing units.
This study sought to evaluate the effects of quartz tungsten halogen (QTH) and light-emitting diode (LED) photocuring units on the degree of conversion (DC) and surface microhardness of a resin composite that had been cured for optimal depth of cure (DoC) assessment. Two hundred and forty cylindrical specimens (4.0 mm in diameter, 2.0-4.0 mm thick) of shade A2 resin composite were prepared and cured with either a QTH or an LED. The DC and top and bottom surface hardness were recorded, and data were analyzed using 2-way ANOVA, Tukey's test, t-test (α = 0.05) and linear regression analysis. The results showed that surface microhardness values and DC were affected by light intensity (P < 0.01), and resin composite thickness (2, 3, and 4 mm) (P < 0.01). Resin composite polymerized by the QTH had an optimal DoC of 3 mm, compared to 4 mm for the LED.
Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
Saijai
S
Tanthanuch
Prapansri
P
Ruengsri
Boonlert
B
Kukiattrakoon
D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry*; D006244:Hardness; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D058105:Polymerization; D011829:Radiation Dosage; D013499:Surface Properties
D003188:Composite Resins; D003764:Dental Materials; C507210:premise composite resin