Related Experiment Videos
Metal surface treatment: characterization and effect on composite-to-metal bond strength
D S Cobb1, M A Vargas, T A Fridrich
1Department of Operative Dentistry, College of Dentistry, The University of Iowa, Iowa City, Iowa 52242, USA.
Operative Dentistry
|February 24, 2001
Summary
The study found that using silane with CoJet-Sand air abrasion significantly improved resin-to-metal bond strength in noble alloys. Other abrasive methods showed similar bond strengths, with diamond bur roughening yielding the lowest results.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Surface Science
Background:
- Achieving durable resin-to-metal bonds is crucial for dental prosthetics.
- Metal surface preparation significantly influences the mechanical interlocking and chemical adhesion of resin cements.
- Evaluating novel surface treatments is essential for improving the longevity of bonded restorations.
Purpose of the Study:
- To compare the effectiveness of four metal surface preparation methods on resin-to-metal bond strength.
- To investigate the role of silane application in enhancing bond strength for different surface treatments.
- To analyze the surface micromorphology and elemental composition after various treatments.
Main Methods:
- Noble metal alloy disks were subjected to four surface treatments: diamond bur roughening, alumina air abrasion, KCP-2000 air abrasion, and CoJet-Sand air abrasion.
- Half of the specimens in each group were treated with silane before applying a resin adhesive system and composite.
- Bond strength was tested after storage and thermocycling; surface analysis used scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS).
Main Results:
- Air abrasion with CoJet-Sand combined with silane treatment yielded significantly higher resin-to-metal bond strength compared to all other methods.
- Diamond bur roughening resulted in the lowest bond strength.
- Silane application significantly enhanced bond strength exclusively for the CoJet-Sand treated surfaces. Aluminum and silicon concentrations increased on CoJet-Sand treated surfaces.
Conclusions:
- CoJet-Sand air abrasion coupled with silane application is a highly effective method for maximizing resin-to-noble metal alloy bond strength.
- The combination of mechanical roughening via specific air abrasion particles and chemical surface modification with silane is key to superior adhesion.
- Standard abrasive methods and diamond bur preparation are less effective in achieving optimal and consistent resin-to-metal bonding.