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An In Vitro Comparison of Shear Bond Strength for Heated Composite Resin With Three Conventional Luting Cements
Prasad Aravind1, Abhinav Mohan Kallat1, Prem Kumar Sivabalan1
1Department of Prosthodontics, Crown and Bridge, Mahe Institute of Dental Sciences and Hospital, Puducherry, IND.
Cureus
|November 29, 2023
Summary
This study compared the shear bond strength of dental luting agents on lithium disilicate. Self-adhesive resin cement demonstrated the highest bond strength, while heated composite resin showed the lowest, suggesting preheating may not improve bond strength.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Luting agents are crucial for indirect restorations.
- Evaluating bond strength of different luting materials is essential for clinical success.
- Lithium disilicate restorations require reliable cementation methods.
Purpose of the Study:
- To compare the shear bond strength of heated composite resin, resin-modified glass ionomer cement (RMGIC), and resin cements on lithium disilicate.
- To evaluate the effect of preheating composite resin on its bond strength.
- To determine the optimal luting agent for bonding to lithium disilicate.
Main Methods:
- Forty-eight lithium disilicate discs were etched with hydrofluoric acid.
- Composite resin was heated to 55-68°C for reduced viscosity.
- Shear bond strength was measured using a universal testing device after luting with different agents.
Main Results:
- Self-adhesive resin cement exhibited the highest mean shear bond strength (7.3740 ± 0.6969 MPa).
- Light-activated resin cement showed the second highest bond strength (4.4647 ± 0.9774 MPa).
- Nanohybrid composite resin had the lowest shear bond strength (2.2851 ± 0.5901 MPa), with significant differences between groups (p≤0.001).
Conclusions:
- Preheating composite resin can reduce viscosity for easier handling but may not enhance bond strength.
- Self-adhesive resin cement is a superior choice for bonding to lithium disilicate compared to heated composite resin and RMGIC.
- Standardization of preheating techniques for composite resins is needed for predictable outcomes in luting procedures.
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