In vitro shear bond strength of orthodontic bondings without liquid resin.
This study aimed at evaluating the early shear bond strength of enamel-composite-bracket adhesion accomplished without the use of liquid resin. Orthodontic brackets were bonded to the buccal surfaces of healthy extracted premolars in the test group by Transbond XT (n = 8) and Phase II (n = 8) composites but not the enclosed liquid resins in these products. Brackets bonded with the same materials (n = 8 for each) along with their corresponding liquid resin served as controls. The specimens were tested for shear bond strength after 24-h storage in water at 37 degrees C. The fractured surfaces were graded with Adhesive Remnant Index (ARI) under a 2x-dissection microscope. Enamel of the randomly selected test and control specimens was dissolved by 20% formic acid. Afterwards, the enamel side of the bonding materials in both groups (n = 4) was examined under the scanning electron microscope. ANOVA was used for statistical analyses. Our laboratory data suggest that the enamel adhesion produced by these two commercial materials without the use of liquid resin does not differ significantly in their early in vitro shear bond strength.
Tang
A T
AT
Unit of Basic Oral Sciences, Institution of Odontology, Karolinska Institutet, Huddinge, Sweden.
Björkman
L
L
Adamczak
E
E
Andlin-Sobocki
A
A
Ekstrand
J
J
D000180:Acrylic Resins / Q000737:chemistry*; D000268:Adhesiveness; D000269:Adhesives / Q000737:chemistry; D000293:Adolescent; D000704:Analysis of Variance; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D005260:Female; D006801:Humans; D007101:Immersion; D008297:Male; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D014867:Water
D000180:Acrylic Resins; D000269:Adhesives; C090340:Reliance resin cement; D019279:Resin Cements; D014867:Water; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate