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Simplified bonding systems not hydrolytically stable

 
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john kanca



Joined: 14 May 2005
Posts: 6346

PostPosted: Sun Dec 28, 2008 12:20 pm    Post subject: Simplified bonding systems not hydrolytically stable Reply with quote

Long-term durability of one-step adhesive-composite systems to enamel and dentin.Foxton RM, Melo L, Stone DG, Pilecki P, Sherriff M, Watson TF.
Division of Conservative Dentistry, King's College London Dental Institute, Guy's Tower, Guy's Hospital, London Bridge, London.

This study evaluated the long-term durability of three one-step adhesive-composite systems to ground enamel and dentin. Twenty-seven teeth were randomly divided into three groups of nine. The first group had its crowns sectioned to expose superficial dentin, which was then ground with 600 grit SiC paper. One of three one-step adhesives: a trial bonding agent, OBF-2; i Bond or Adper Prompt L-Pop was applied to the dentin of three teeth and built-up with the corresponding resin composite (Estelite sigma, Venus or Filtek Supreme). The second group of nine teeth had their enamel approximal surfaces ground with wet 600-grit SiC paper, then one of the three one-step adhesives was applied and built-up with resin composite. The bonded specimens were sliced into 0.7 mm-thick slabs. After 24 hours and one year of water storage at 37 degrees C, the slabs were sectioned into beams for the microtensile bond strength test. Failure modes were observed using optical and electron scanning microscopy. The third group of nine teeth had approximal wedge-shaped cavities prepared above the CEJ into dentin. Two-to-three grains of rhodamine B were added to each of the three adhesives prior to restoring the cavities with resin composite. After 24 hours storage, the teeth were sectioned and their interfaces examined with a laser scanning confocal microscope. The bond strengths of the three adhesive-composite systems to both enamel and dentin significantly lessened after one year of water storage, however, there was no significant difference between the materials.
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twmdds



Joined: 16 May 2006
Posts: 142

PostPosted: Mon Dec 29, 2008 6:45 pm    Post subject: Reply with quote

John I thought you had done a comparison project and determined that the bond strengths of Surpass and Simplicity decreased at a slower rate than other products. True?
Tom Mitchell
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john kanca



Joined: 14 May 2005
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PostPosted: Mon Dec 29, 2008 10:14 pm    Post subject: Reply with quote

twmdds wrote:
John I thought you had done a comparison project and determined that the bond strengths of Surpass and Simplicity decreased at a slower rate than other products. True?
Tom Mitchell


Of course. The above list does not include either Simplicity or Surpass. Both Simplicity and Surpass are long term stable.
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