Objectives: Experimental two-step universal adhesives (2-UAs) providing a particle-filled hydrophobic adhesive resin with a significant film thickness to hydrophobically seal the adhesive interface were designed and synthesized. This study aimed to characterize their interfacial interaction with dentin, to determine whether the 2-UA formulations achieve durable bonding to low C-factor flat dentin and to measure their water sorption.
Methods: Bonding effectiveness of 2-UAs that combine a 10-MDP-based primer with hydrophobic adhesive resins differing only for filler (BZF-21, BZF-29, and BZF-29_hv) were comparatively investigated with the commercial adhesive Clearfil SE Bond 2 (C-SE2, Kuraray Noritake). Adhesive-dentin interfaces were characterized with TEM. Adhesive-resin disks were immersed in distilled water at 37 °C for 1 week, 6 months and 1 year to measure water sorption and solubility. 'Immediate' and 'aged' micro-tensile bond strength (μTBS) of the adhesives applied in etch-and-rinse (E&R) and self-etch (SE) bonding mode to low C-factor flat dentin were measured. Statistical analyses involved linear mixed-effects (LME) modelling and Kruskal-Wallis testing (p < 0.05).
Results: TEM revealed that E&R hybrid layers were more sensitive to aging than SE hybrid layers. Lower water sorption was recorded for all UAs compared with C-SE2. The immediate μTBS of BZF-21 and BZF-29 was not significantly different from that of C-SE2. The 1-year aged μTBS of all 2-UAs was significantly lower than that of C-SE2, except for BZF-29 applied in E&R mode. A significant reduction in μTBS upon 1-year aging was recorded for BZF-21 and BZF-29 applied in E&R mode. A significant difference in μTBS between E&R and SE bonding modes was recorded for all adhesives except BZF-21.
Significance: Experimental 2-UAs with a hydrophobic adhesive-resin design produced± 20-μm thick adhesive-resin layers, absorbed less water and resulted in bonding performance that was more aging-resistant when applied in SE than in E&R bonding mode. The silica-filled BZF-29 2-UA revealed the most comparable bonding performance with C-SE2 in a low C-factor condition (flat dentin).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.dental.2023.04.008 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Bleeding risk in hemophilia A and B carriers: comparison of factor levels determined using chronometric and chromogenic assays.
Blood Coagul Fibrinolysis
July 2024
Hemophilia Treatment Centre, Department of Biological Hematology.
Article Synopsis
- Predicting bleeding risk in carriers of hemophilia A and B is complex, and the study aims to analyze the bleeding phenotype using the standardized Tosetto bleeding score (BS).
- The study found no significant differences in median bleeding scores or abnormal scores between hemophilia A carriers (HAC) and hemophilia B carriers (HBC), but noted a higher risk of factor deficiency in HBC.
- Significant findings include that specific factor activity thresholds were good predictors of bleeding risk in HBC, while no reliable threshold for FVIII:C levels was identified for HAC due to variability.
Dentin adhesion of bulk-fill composites and universal adhesives in class I-cavities with high C-factor.
J Dent
March 2024
Hannover Medical School, Department of Conservative Dentistry, Periodontology and Preventive Dentistry, OE 7740, Carl-Neuberg-Straße 1, Hannover 30625, Germany. Electronic address:
Objectives: The aim of this study was to compare the dentin adhesion of bulk-fill composites in high C-factor class I-cavities before and after thermocycling to a control group using incremental layering technique.
Methods: A standardized class I-cavity was prepared into 195 human molars, then different universal adhesives were applied either in self-etch or etch & rinse mode, and the cavity was filled according to each materials application protocol. The material combinations used were a conventional layered composite as control, the respective bulk-fill product, two other bulk-fill composites made by different manufacturers, with one of them being tested using two different polymerization times.
Application and limitations of configuration factor (C-factor) in stress analysis of dental restorations.
Dent Mater
December 2023
Department of Prosthodontics, The Affiliated Hospital of Qingdao University, 266000 Qingdao, China; School of Stomatology of Qingdao University, 266003 Qingdao, China. Electronic address:
Article Synopsis
- The C-factor (configuration factor) is used to assess how cavity shape affects polymerization shrinkage stress in dental restorations, but its relevance in stress analysis is debated.
- A literature review highlighted the limitations of the C-factor, revealing it only applies accurately in specific, rare clinical scenarios involving low compliance.
- Defining these conditions improves understanding of polymerization shrinkage, ultimately enhancing dental restoration practices.
Bonding performance of experimental HEMA-free two-step universal adhesives to low C-factor flat dentin.
Dent Mater
June 2023
KU Leuven (University of Leuven), Department of Oral Health Sciences, BIOMAT - Biomaterials Research Group & UZ Leuven (University Hospitals Leuven), Dentistry, Leuven, Belgium. Electronic address:
Objectives: Experimental two-step universal adhesives (2-UAs) providing a particle-filled hydrophobic adhesive resin with a significant film thickness to hydrophobically seal the adhesive interface were designed and synthesized. This study aimed to characterize their interfacial interaction with dentin, to determine whether the 2-UA formulations achieve durable bonding to low C-factor flat dentin and to measure their water sorption.
Methods: Bonding effectiveness of 2-UAs that combine a 10-MDP-based primer with hydrophobic adhesive resins differing only for filler (BZF-21, BZF-29, and BZF-29_hv) were comparatively investigated with the commercial adhesive Clearfil SE Bond 2 (C-SE2, Kuraray Noritake).
Impact of tumor contact surface area on collecting system entry in robot-assisted partial nephrectomy: a retrospective analysis.
BMC Urol
May 2023
Department of Urology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, 259-1193, Kanagawa, Japan.
Background: Collecting system entry in robot-assisted partial nephrectomy may occur even in cases showing a low N factor in the R.E.N.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!