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Composite-composite Adhesion as a Function of Adhesive-composite Material and Surface Treatment
Operative Dentistry
|November 17, 2018
Summary
The choice of adhesive and composite material significantly impacts dental composite repair strength. Using Filtek Supreme Ultra (FSU) as the repair composite generally yields higher interfacial fracture toughness (iFT).
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Dental composite restorations often require repair, necessitating understanding of bond strength between old and new materials.
- Interfacial fracture toughness (iFT) is a critical parameter for evaluating the durability of composite-to-composite repairs.
- Previous studies have explored various factors influencing repair bond strength, but material-specific interactions require further investigation.
Purpose of the Study:
- To quantitatively assess the interfacial fracture toughness (iFT) in dental composite repairs.
- To determine the influence of different adhesive systems and composite repair materials on iFT.
- To evaluate the effect of surface preparation (acid etching) on repair bond strength.
Main Methods:
- Beam-shaped composite specimens (Filtek Supreme Ultra [FSU] or Clearfil Majesty ES-2 [CME]) were artificially aged.
- Specimens were repaired using different combinations of substrate composite, adhesive (Scotchbond Universal or Clearfil SE Bond 2), and repair composite, with or without acid etching.
- Interfacial fracture toughness (iFT) was measured after post-repair storage and analyzed using three-way ANOVA and Tukey post hoc tests.
Main Results:
- Interfacial fracture toughness (iFT) values ranged from 0.64 to 1.28 MPa.
- Using FSU as the repair composite significantly increased iFT, irrespective of the substrate material (p<0.001).
- Clearfil SE Bond 2 adhesive resulted in significantly higher iFT when used with an FSU substrate (p<0.001), while acid etching showed no significant effect (p>0.05).
Conclusions:
- The strength of dental composite repairs is significantly dependent on the specific adhesive and composite materials employed.
- Utilizing Filtek Supreme Ultra (FSU) as the repair composite material appears to enhance repair strength, regardless of the adhesive system used.
- The findings provide valuable insights for clinicians selecting materials to optimize the longevity of composite restorations.
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