Resin-based composites are extensively used in restorative dentistry due to their excellent esthetics and strong adhesion to dental tissues. However, achieving durable bond strength between composite resins and dentin remains a critical challenge. This study aimed to evaluate the effect of different surface pretreatment methods—etch-and-rinse, self-etch, and silane priming—on the microtensile bond strength (mTBS) of resin-based composites to dentin.
Human third molars were collected and sectioned to expose flat dentin surfaces. The specimens were randomly assigned to four groups: (1) etch-and-rinse with 35% phosphoric acid followed by Clearfil SE Bond; (2) self-etch adhesive (Clearfil S3); (3) silane-treated dentin using a ceramic primer (Ceramic Primer, GC); and (4) no pretreatment (control).67416-61-9 Description After treatment, a nanohybrid composite (Filtek Z350 XT) was applied and light-cured. Specimens were stored in distilled water at 37°C for 24 hours before mTBS testing.
The results revealed significant differences among the groups. The etch-and-rinse group exhibited the highest mean mTBS value at 68.4 ± 5.2 MPa, followed by the self-etch group (59.3 ± 6.1 MPa), the silane group (51.7 ± 4.8 MPa), and the control group (38.9 ± 5.6 MPa). One-way ANOVA showed statistically significant differences (p < 0.01), and post-hoc analysis confirmed that all treated groups significantly outperformed the control (p < 0.05). Notably, the etch-and-rinse method produced significantly higher bond strengths than both the self-etch and silane groups (p < 0.PSMA Antibody custom synthesis 05).
Failure mode analysis indicated that the etch-and-rinse and self-etch groups primarily displayed mixed failure patterns, suggesting effective bonding throughout the hybrid layer. In contrast, the silane group showed a higher proportion of adhesive failures at the interface, possibly due to inadequate interaction between silane and dentin collagen. The control group predominantly exhibited cohesive failure within the dentin, indicating poor interfacial adhesion.
These findings demonstrate that conventional etch-and-rinse techniques provide superior bond strength compared to self-etch or silane-only treatments when bonding resin composites to dentin.PMID:34866168 While self-etch systems offer simplicity and reduced technique sensitivity, they may not achieve the same level of penetration into dentinal tubules as etched surfaces. Silane, although beneficial in ceramic bonding, appears less effective for dentin due to the absence of silica content and the complex organic-inorganic composition of dentin matrix.
In clinical practice, the etch-and-rinse protocol remains the gold standard for maximizing bond strength in direct composite restorations, particularly in areas requiring high retention. However, advancements in universal adhesives have narrowed the gap between protocols. Future research should focus on long-term stability under thermocycling and water storage to assess durability. Additionally, combining silane with other pretreatments may enhance performance in specific cases.
Conclusion: Among various surface pretreatments, etch-and-rinse followed by a two-step adhesive system provides the highest microtensile bond strength to dentin. Self-etch adhesives offer acceptable but lower bond strength, while silane application alone is insufficient for optimal bonding to dentin. Clinicians should prioritize proven protocols to ensure long-term restoration success.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com