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Repairability of cross-linked biopolymers

M Balkenhol1, K Michel, J Stelzig

  • 1Department of Prosthetic Dentistry, Justus-Liebig-University, Schlangenzahl 14, D-35392 Giessen, Germany. markus.balkenhol@dentist.med.uni-giessen.de

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Acetone-based bonding liquids significantly improve the repair strength of aged dental biopolymers, unlike methyl methacrylate (MMA). This finding is crucial for durable temporary restorations in dentistry.

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Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Polymer Chemistry

Background:

  • Repairing aged biopolymers, particularly for dental restorations, is challenging.
  • Achieving a strong chemical bond at the repair interface is key to improving restoration longevity.
  • Current repair methods for temporary restorations often lack sufficient bond strength after aging.

Purpose of the Study:

  • To evaluate the efficacy of different repair liquids in establishing a strong bond with artificially aged dimethacrylate-based biopolymers.
  • To determine if specific formulations can enhance the bond strength for temporary dental restorations.

Main Methods:

  • Specimens of a self-curing temporary crown-and-bridge material were artificially aged via thermocycling (7 days, 5000 cycles, 5-55°C).
  • Light-curing composite cylinders were bonded using various repair liquids: a Bis-GMA:TEGDMA bonding agent, methyl methacrylate (MMA), bonding agent with acetone, and bonding agent with MMA.
  • Shear bond strength was measured 24 hours post-repair.

Main Results:

  • The highest shear bond strength (20.1 ± 2.2 MPa) was achieved using the bonding agent combined with acetone.
  • Repair with methyl methacrylate (MMA) resulted in significantly lower bond strength (6.8 ± 1.9 MPa).
  • Grinding the surface without a specific repair liquid also yielded lower bond strength compared to the acetone group.

Conclusions:

  • Repair liquids containing acetone demonstrate superior performance in bonding aged composite-based biopolymers for temporary restorations.
  • Methyl methacrylate (MMA) is unsuitable as a repair liquid for aged composite-based biopolymers due to inadequate bond strength.
  • Optimized repair liquid formulations are essential for enhancing the durability of aged dental restorations.