Shear Bond Strength Comparison of Two Adhesive Systems Following Thermocycling

Self Cite

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.

Section: Discussionsupporting

confidence: 60%

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

Bishara

Ostby

Laffoon

et al. 2007

Self Cite

“…This value is similar to published values for the Transbond Plus SEP adhesive system, which have ranged from 6.1 MPa to 10.4 MPa, although these studies used different experimental conditions. 16,17 On the other hand, the mean bond strength obtained with the Fuji Ortho LC Automix in this study was 3.7 MPa, which was lower than previously published values (3.7-12.6 MPa) for other types of RMGIC (Fuji Ortho LC and Photac-Fil Aplicap). Most studies refer to an article by Reynolds (1975), who proposed that 6 to 8 MPa was a clinically acceptable value for the bracket bond strength.…”

Section: Discussioncontrasting

confidence: 54%

Bracket bond strength and cariostatic potential of an experimental resin adhesive system containing Portland cement

Iijima¹,

Hashimoto²,

Nakagaki³

et al. 2012

Objective: To determine if a new experimental resin-based material containing Portland cement (PC) can help prevent enamel caries while providing adequate shear bond strength (SBS). Materials and Methods: Brackets were bonded to human premolars with experimental resinbased adhesive pastes composed of three weight rations of resin and PC powder (PC 30, 7:3; PC 50,5:5; PC 70, 3:7; n 5 7). Self-etching primer (SEP) adhesive (Transbond Plus) and resinmodified glass ionomer cement (RMGIC) adhesive (Fuji Ortho FC Automix) were used for comparison. All of the bonded teeth were subjected to alternating immersion in demineralizing (pH 4.55) and remineralizing (pH 6.8) solutions for 14 days. The SBS for each sample was examined, and the Adhesive Remnant Index (ARI) score was calculated. The hardness and elastic modulus of the enamel were determined by a nanoindenter at 20 equidistant depths from the external surface at 100 mm from the bracket edge. Data were compared by one-way analysis of variance and a chi-square test. Results: PC 50 and PC 70 showed significantly greater SBS than Fuji Ortho FC Automix, although Transbond Plus showed significantly greater SBS than other bonding systems. No significant difference in the ARI category was observed among the five groups. For specimens bonded with PC 50 and PC 70, the hardness and elastic modulus values in most locations were equivalent to those of Fuji Ortho FC Automix. Conclusions: Experimental resin-based bonding material containing PC provides adequate SBS and a caries-preventive effect equivalent to that of the RMGIC adhesive system. (Angle Orthod. 2012;82:900-906.)

“…The SBS values for orthodontic brackets attached to tooth enamel with resin composites or glass ionomer-type adhesives have been reported to be in the range of 4-26 MPa. [14][15][16][17][18][19] The selection of the premolar brackets instead of maxillary central incisor brackets was based upon ready availability of the former. The curvature of the bracket against the flat surface of the PCM probably resulted in SBS values that were lower than those that would have resulted if central incisor brackets with smaller curvature were used as reported previously.…”

Section: Discussionmentioning

confidence: 99%

“…Bis-acryl-composite resins, as compared to poly methylmethacrylate or poly ethylmethacrylate, show low exothermic reaction during setting, better strength, adequate margin adaptation, and superior color stability. 10 The range of force required for translatory movement of teeth is reported to be 70-120 g; for extrusion, 35-60 g. 11,12 Comparing such forces, Reynolds 13 has suggested that a minimum tensile bonding strength of [14][15][16][17][18][19] Information related to the bond strength of brackets with various other restorative and experimental materials is also available [20][21][22][23] ; however, information specifically related to PCMs is rather limited. 21 The objective of this in vitro study was to compare the shear bond strength (SBS) between four widely and commonly used PCMs and two different types of orthodontic brackets, using two separate adhesive agents.…”

Section: Introductionmentioning

confidence: 99%

Shear Bond Strength of Orthodontic Brackets Bonded to Provisional Crown Materials Utilizing Two Different Adhesives

Rambhia

Heshmati

Dhuru

et al. 2009

Objective: To test the hypothesis that there is no difference in the shear bond strength of brackets bonded to provisional crown materials (PCMs) using two adhesive agents. Materials and Methods: Four PCMs were tested: Integrity, Jet, Protemp, and Snap. Forty cylindrical specimens of 10 mm diameter ϫ 5 mm were prepared for each PCM. Ten specimens from each group were bonded to one of the two brackets, Clarity or Victory, using one of the two adhesives, Fuji Ortho LC or Ortho Bracket Adhesive. The brackets were debonded in shear at a cross-head speed of 5 mm/min, and the shear bond strength (SBS) was calculated. The type of failure was visually determined. The numeric data were analyzed using three-way analysis of variance and Tukey multiple range test at ␣ ϭ .05. Results: The mean SBSs ranged from 2.81 MPa to 9.65 MPa. There was a significant difference between Snap and the other three materials (P Ͻ .0001). There was no significant difference between the two brackets or the two adhesives (P Ͼ .05). The bond failure for all the specimens was of the adhesive type between the PCM and the adhesive resin. Conclusions:The PCM Snap yielded a significantly lower mean SBS value compared to the other three materials. No significant differences were found between the brackets or the adhesives. The bond failure was of the adhesive type. (Angle Orthod. 2009;79:784-789.)