AI Article Synopsis
- The study investigates how amalgam contamination and various surface treatments influence the shear bond strength (SBS) of dentin when bonding with bulk-fill composite resin.
- Eighty teeth were tested, with different treatment groups assigned based on chlorhexidine application, dentin removal, and adhesive protocol—results showed that acid etching led to the highest SBS values.
- Findings suggest that amalgam contamination negatively impacts SBS, while chlorhexidine treatment can enhance bonding strength, particularly in untreated and dentin-refreshment groups.
Article Abstract
Purpose: To evaluate the effect of amalgam contamination, different surface treatments, and adhesive protocols on dentin shear bond strength (SBS) to bulk-fill composite resin material.
Materials And Methods: Eighty teeth were fixed in molds, and the dentin was exposed and then polished. Sixty teeth were restored by amalgam and thermocycled to 10,000 cycles (5°C and 55°C, 30-second dwell time). The rest were restored with composite materials without amalgam predecessor. The samples were divided into G1 (with dentin pretreatment with 2% chlorhexidine gluconate), G2 (0.5 mm of dentin was removed), G3 (no surface modification), and G4 (samples were restored with bulk-fill composite). The bonded specimens were subdivided based on the adhesive protocol of the universal adhesive system used into etch-and-rinse and self-etch groups. Acid etching was done using 32% phosphoric acid. Composite resin was used for build-up using mold and glass. Specimens were cured and left for 24 h in distilled water at room temperature for polymerization reaction, underwent thermocycling for 5000 cycles, and were subjected to knife-edge shear bond testing. Descriptive statistics, independent -tests, and one-way analysis of variance followed by pairwise comparisons were used to analyze the results.
Results: The highest mean SBS values were found in the control group where acid etching was used (24.46±2.24 MPa), followed by self-etching in the same group (21.92±2.54 MPa). Lower SBS values were associated with the amalgam-contaminated group. The lowest values were found in the dentin refreshment group when the self-etching mode was used (13.59±1.73 MPa). Chlorhexidine treatment improved the mean SBS value compared with the no treatment or dentin refreshment groups for both adhesive protocols.
Conclusion: Amalgam contamination may affect SBS values. Acid etching improved SBS for non-contaminated dentin. Chlorhexidine improved SBS for amalgam-contaminated dentin as a surface treatment but had no significant effect.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8166260 | PMC |
| http://dx.doi.org/10.2147/CCIDE.S307545 | DOI Listing |
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