A Self-Conditioner for Resin-Modified Glass Ionomers in Bonding Orthodontic Brackets

Abstract

Objective: To evaluate a new self-etch conditioner used with resin-modified glass ionomers (RMGIs) in bonding orthodontic brackets. Materials and Methods: Sixty human molars were cleaned, mounted, and randomly divided into three groups. In group 1 (control), 20 orthodontic brackets were bonded to teeth using Transbond Plus Self-etching Primer; in group 2, 20 brackets were bonded using an RMGI with a 10% polyacrylic acid conditioner. In group 3, 20 brackets were bonded using Fuji Ortho LC with a new norinse self-conditioner for RMGIs. The same bracket type was used on all groups. The teeth were debonded in shear mode using a universal testing machine, and the amount of residual adhesive remaining on each tooth was evaluated. Analysis of variance was used to compare the shear bond strength (SBS), and the 2 test was used to compare the Adhesive Remnant Index (ARI) scores. Results: There were no significant differences in the SBS (P ϭ .556) between the groups. The mean SBS for Transbond Plus was 8.6 Ϯ 2.6 MPa, for Fuji Ortho LC using 10% polyacrylic acid 9.1 Ϯ 4.6 MPa, and for Fuji Ortho LC using GC Self-conditioner 9.9 Ϯ 4.1 MPa. The comparisons of the ARI scores between the three groups ( 2 ϭ 35.5) indicated that bracket failure mode was significantly different (P Ͻ .001), with more adhesive remaining on the teeth bonded using Transbond. Conclusions:The new self-etch conditioner can be used with an RMGI to successfully bond brackets. In addition, brackets bonded with Fuji Ortho LC resulted in less residual adhesive remaining on the teeth.

Consequences of enamel preparation with sodium hypochlorite, polyacrylic and phosphoric acids for the bonding of brackets with resin-modified glass ionomer cements

“…This modification has improved the performance of this cement as an orthodontic bonding agent via the addition of resinous components. However, even this higher BS remains below the strengths that were recorded for composite resins [8][9][10] . The use of 5.25% sodium hypochlorite (NaOCl) as a enamel deproteinizing agent prior to acid conditioning and bracket bonding with RMGIC has been suggested as a means of increasing bond strength.…”

Effect of 10% papain gel on enamel deproteinization before bonding procedure

“…This is explained by the fact that the polyacrylic acid etching agent used in these groups has an etching pattern with less extension and depth than that of phosphoric acid, as observed in several other studies. [7][8][9][10][11][12][13][14] In a study conducted by Smith and Cartz, 15 etching with polyacrylic acid caused little demineralization of the enamel surface. Bishara and Ostby 8 also observed that teeth etched with polyacrylic acid had a significantly lower shear bond strength than teeth etched with 37% phosphoric acid before being bonded with RMGIC, which was proved in the present study.…”

“…With the intention of combining important characteristics of the two materials, such as shear bond strength and fluoride release, RMGICs were developed, which release fluoride without compromising the bond strength to the tooth surface. [10][11][12] The bond strength between orthodontic accessories and enamel may be compromised by the presence of the acquired pellicle, which covers the soft and hard tissues in the oral region, particularly the surface of tooth enamel. This membrane is a biofilm free of bacterial colonization, and its most abundant components are proteins, glycoproteins, enzymes, and mucins or their derivatives.…”

Efecto del peróxido de hidrógeno al 40% sobre la fuerza de adhesión de brackets metálicos

“…Nuestros datos son similares a los reportados por Nascimento et al (19) y Pithon et al (29); esto puede explicar la idea de que los efectos de los agentes químicos pueden causar las fallar de adhesión en la interfase esmalte adhesivo. Según Bishara et al, el hecho de que la falla ocurra en la interfase bracket/adhesivo se convierte en un fenómeno de protección para el esmalte dental, ya que la estructura del esmalte permanece intacta, previniendo posibles daños durante el proceso de remoción de los brackets (30).…”