Effect of Composite Containing an Iodonium Salt on the Bond Strength of Brackets to Bovine Enamel

Abstract

This study investigated the effect of the incorporation of an iodonium salt in experimental composites, on the bond strength of metallic brackets bonded to bovine teeth. Two hundred and seventy bovine teeth were embedded in self-curing acrylic resin and divided into 18 groups (n=15), according to the experimental composite with an iodonium salt at molar concentrations 0 (control), 0.5, or 1%; the light-activation times (8, 20 and 40 s); and the storage times (10 min or 24 h). Metallic brackets were fixed on the tooth surface using experimental composites. Photoactivation was performed with a quartz-tungsten-halogen light-curing unit curing unit for 8, 20 and 40 s. The specimens were stored in distilled water at 37 °C for 10 min or 24 h and submitted to bond strength test at 0.5 mm/min. The data were subjected to three-way ANOVA and Tukey's test (α=0.05). The Adhesive Remnant Index (ARI) was used to classify the failure modes. The shear bond strengths (MPa) at 10 min for light-activation times of 8, 20 and 40 s were: G1 - 4.6, 6.9 and 7.1; G2 - 8.1, 9.2 and 9.9; G3 - 9.1, 10.4 and 10.7; and at 24 h were: G1 - 10.9, 11.1 and 11.7; G2 - 11.8, 12.7 and 14.2; G3 - 12.1, 14.4 and 15.8. There was a predominance of ARI score 3 for groups with 10 min storage time, and ARI score 2 for groups with 24 h storage time. In conclusion, the addition of iodonium salt (C05 and C1) to the experimental composite may increase the bond strength of brackets to bovine enamel using reduced light exposure times.

Influence of Water Storage and Bonding Material on Bond Strength of Metallic Brackets to Ceramic

“…After storage, a mounting jig was used to align the ceramic-bracket interface parallel to the testing device. The shear bond test was conducted in a testing machine (Model 4411; Instron, Canton, MA, USA) with shear load applied using a knife-edged rod at a crosshead speed of 1.0 mm/min until failure (1,2,14,15). The shear bond strength data were calculated in MPa and submitted to two-way ANOVA and Tukey's test (p<0.05).…”

Influence of Light Source, Thermocycling and Silane on the Shear Bond Strength of Metallic Brackets to Ceramic

“…The shear bond test was performed in a universal mechanical testing machine (Model 4411; Instron, Canton, MA, USA) using a knife-edged rod at a crosshead speed of 1.0 mm/min until failure. A mounting jig was used to align the ceramic-bracket interface parallel to the testing device (2,7,14). The shear bond strength values were calculated in MPa.…”

Influence of Photoinitiator and Light-Curing Source on Bond Strength of Experimental Resin Cements to Dentin

“…Another major problem is that the α-diketone group derived from CQ, has peak absorption in the visible range (468 nm) (12), resulting in fast photopolymerization under ambient light (fluorescent lamps and dental lamps) and a short operation time (1). It is the reason why researchers have tested different photoinitiators in the organic matrix to substitute or act synergistically with CQ (7)(8)(9)(10).…”