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Comparing Various Resin Luting Cement Systems in Different Etching Modes Through Bond Durability and Morphological
S Watanabe1, T Takamizawa2, K Hayashi3
1Satoru Watanabe, DDS, Department of Operative Dentistry, Nihon University Graduate School of Dentistry, Tokyo, Japan.
Operative Dentistry
|February 13, 2024
Summary
Resin luting cements (RLCs) combined with universal adhesives generally improved bond strength on enamel and dentin compared to RLCs alone. Etching mode significantly influenced bond performance, with etch-and-rinse (ER) favoring enamel and self-etch (SE) favoring dentin.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials
Background:
- Resin luting cements (RLCs) are crucial for indirect restorations.
- Optimizing RLC bond performance to tooth structure is essential for restoration longevity.
- Understanding the influence of etching modes on RLC bonding is critical.
Purpose of the Study:
- To evaluate the bond performance of various RLC systems on enamel and dentin.
- To compare RLC-tooth interface morphology using scanning electron microscopy (SEM).
- To investigate the effect of different etching modes on RLC bond strength.
Main Methods:
- Tested self-adhesive RLCs with and without universal adhesives, and conventional RLCs.
- Measured shear bond strength (SBS) in etch-and-rinse (ER) and self-etch (SE) modes.
- Assessed bonded specimens at baseline and after 10,000 thermocycles (TC).
- Utilized SEM for analyzing RLC-tooth interface morphology.
Main Results:
- All factors (etching mode, storage, RLC system) significantly affected enamel SBS (p<0.05).
- Enamel SBS was higher in ER mode than SE mode.
- All factors significantly affected dentin SBS (p<0.001).
- Most RLCs showed higher dentin SBS in SE mode than ER mode.
- One RLC combination showed no difference between modes at baseline but higher SBS in ER mode after TC.
Conclusions:
- Self-adhesive RLCs with universal adhesives generally exhibited superior bond performance.
- Interface morphology depended on the RLC system and etching mode.
- RLCs with primer application formed a thin, dense layer on dentin, suggesting chemical interaction.
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