scholarly journals Improved Dental Adhesive Formulations Based on Reactive Nanogel Additives

2011 ◽  
Vol 91 (2) ◽  
pp. 179-184 ◽  
Author(s):  
R.R. Morães ◽  
J.W. Garcia ◽  
N.D. Wilson ◽  
S.H. Lewis ◽  
M.D. Barros ◽  
...  
Keyword(s):  
Water Solubility ◽  
Short Term ◽  
Hybrid Layer ◽  
Dental Adhesive ◽  
Adhesive Dentistry ◽  
Preliminary Validation ◽  
Water Percolation ◽  
Bond Strengths ◽  
Tensile Bond Strengths ◽  
Reduced Water

Current challenges in adhesive dentistry include over-hydrophilic bonding formulations, which facilitate water percolation through the hybrid layer and result in unreliable bonded interfaces. This study introduces nanogel-modified adhesives as a way to control the material’s hydrophobic character without changing the basic monomer formulation (keeping water-chasing capacity and operatory techniques unaltered). Nanogel additives of varied hydrophobicity were synthesized in solution, rendering 10- to 100-nm-sized particles. A model BisGMA/HEMA solvated adhesive was prepared (control), to which reactive nanogels were added. The increase in adhesive viscosity did not impair solvent removal by air-thinning. The degree of conversion in the adhesive was similar between control and nanogel-modified materials, while the bulk dry and, particularly, the wet mechanical properties were significantly improved through nanogel-based network reinforcement and reduced water solubility. As preliminary validation of this approach, short-term micro-tensile bond strengths to acid-etched and primed dentin were significantly enhanced by nanogel inclusion in the adhesive resins.

A Comprehensive Laboratory Screening of Three-Step Etch-and-Rinse Adhesives

2014 ◽  
Vol 39 (6) ◽  
pp. 652-662 ◽  
Author(s):  
AD Loguercio ◽  
I Luque-Martinez ◽  
MA Muñoz ◽  
AL Szesz ◽  
J Cuadros-Sánchez ◽  
...  
Keyword(s):  
Composite Resin ◽  
Adhesive System ◽  
Degree Of Conversion ◽  
Adhesive Systems ◽  
Short Term ◽  
Hybrid Layer ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Etch And Rinse ◽  
Bond Strengths

SUMMARY Objectives This study evaluated several bonding (microtensile bond strengths [μTBS], nanoleakage [NL], and in situ degree of conversion [ISDC] on dentin) and mechanical properties (ultimate tensile strength [UTS], degree of conversion [DC], water sorption [WS], and solubility [SL] in water) of four three-step etch-and-rinse adhesives in the short term. Methods A total of 28 molars were used in this study. The dentin surfaces were bonded with the following adhesives: All-Bond 3 (ALB3); Fusion Duralink (FSDL); Optibond FL (OBFL), and Scotchbond Multi-Purpose (SBMP). After each adhesive-system application, composite resin build-ups were added. For bonding tests, specimens were sectioned in order to obtain bonded sticks. The sticks were divided to be tested for μTBS (0.5 mm/min), for NL (n=2), and ISDC (n=2). For NL, they were immersed in 50% silver nitrate and analyzed by scanning election microscopy. For ISDC, the hybrid layer was evaluated by micro-Raman spectroscopy. An hourglass-shaped matrix (UTS) or disk-shaped matrix (WS and SL) was filled with primer and adhesive (1:1 ratio) and light-polymerized. For UTS evaluation, the specimens were tested under tension. For WS and SL, specimens were desiccated and stored in distilled water to evaluate water diffusion kinetics over a 28-day period. The DC of the adhesives was evaluated by Fourier transformed infrared spectroscopy. The data from each test were analyzed by appropriate statistical methods. Results OBFL resulted in the highest μTBS, lower NL, higher ISDC and DC, and higher UTS than other adhesives (p<0.05), as well as lower WS (similar to ALB3 and FSDL) and SL (similar to ALB3 and SBMP) (p>0.05). ALB3 showed a higher NL and the lowest DC value. FSDL showed the highest NL and SL and the lowest ISDC. SBMP showed the lowest pattern of WS (p<0.05). Conclusion OBFL showed the best results in all the properties evaluated, and it can be considered the gold standard of the three-step etch-and-rinse adhesive systems.

Total etch dentin bonding systems: scanning electron microscopy of the resin-dentin hybrid layer

1992 ◽  
Vol 50 (2) ◽  
pp. 1092-1093
Author(s):  
Jorge Perdigao
Keyword(s):  
Composite Resin ◽  
Mechanical Interlocking ◽  
Hybrid Layer ◽  
Agent Based ◽  
Dentin Bonding ◽  
Acid Agent ◽  
Bond Strengths ◽  
Main Component ◽  
Bonding Systems ◽  
New Generation

In 1955, Buonocore introduced the etching of enamel with phosphoric acid. Bonding to enamel was created by mechanical interlocking of resin tags with enamel prisms. Enamel is an inert tissue whose main component is hydroxyapatite (98% by weight). Conversely, dentin is a wet living tissue crossed by tubules containing cellular extensions of the dental pulp. Dentin consists of 18% of organic material, primarily collagen. Several generations of dentin bonding systems (DBS) have been studied in the last 20 years. The dentin bond strengths associated with these DBS have been constantly lower than the enamel bond strengths. Recently, a new generation of DBS has been described. They are applied in three steps: an acid agent on enamel and dentin (total etch technique), two mixed primers and a bonding agent based on a methacrylate resin. They are supposed to bond composite resin to wet dentin through dentin organic component, forming a peculiar blended structure that is part tooth and part resin: the hybrid layer.

Oil pollution and fisheries

1982 ◽  
Vol 297 (1087) ◽  
pp. 401-411 ◽  
Keyword(s):  
Water Quality ◽  
Adverse Effects ◽  
Oil Pollution ◽  
Coastal Areas ◽  
Short Term ◽  
Fish Stocks ◽  
Local Impacts ◽  
Reduced Water ◽  
Long Term Adverse Effects

The term ‘pollution’ is taken in its broadest sense and effects are recognized to be due to interference, tainting and toxicity. Each of these types of impact is discussed and assessed. It is concluded that no long-term adverse effects on fish stocks can be attributed to oil but that local impacts can be extremely damaging in the short term and that produce from specific localities can be tainted and unmarketable for long periods. In some coastal areas oil can be one among several contributors to reduced water quality, and the implications of this are discussed.

A universal dental adhesive containing copper nanoparticles stabilizes the hybrid layer in eroded dentin after 1 year

2021 ◽  
pp. 103041
Author(s):  
Taíse Alessandra Hanzen ◽  
Mario Felipe Gutiérrez ◽  
Thalita de Paris Matos ◽  
Alexandra Mara de Paula ◽  
Fabiana Suelen Figueredo de Siqueira ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Hybrid Layer ◽  
Dental Adhesive

Tensile bond strengths of provisional luting agents used with an implant system

1999 ◽  
Vol 81 (5) ◽  
pp. 510-514 ◽  
Author(s):  
Merrie H. Ramp ◽  
Donna L. Dixon ◽  
Lance C. Ramp ◽  
Larry C. Breeding ◽  
Lindsay L. Barber
Keyword(s):  
Luting Agents ◽  
Bond Strengths ◽  
Implant System ◽  
Tensile Bond Strengths

Direct Bonding in Orthodontics: A Comparison of Attachments

1977 ◽  
Vol 4 (2) ◽  
pp. 65-69 ◽  
Author(s):  
I. R. Reynolds ◽  
J. A. von Fraunhofer
Keyword(s):  
Clinical Practice ◽  
Human Enamel ◽  
Bond Strengths ◽  
Tensile Bond Strengths

The tensile bond strengths to human enamel of metallic and non-metallic direct bonding attachments used with their recommended adhesives are reported. The results obtained are compared and contrasted and the findings are discussed in relation to clinical practice.

scholarly journals Comparison of the micro-tensile bond strengths of four different universal adhesives to caries-affected dentin after ER:YAG laser irradiation

2019 ◽  
Vol 38 (2) ◽  
pp. 218-225 ◽  
Author(s):  
Nazmiye DÖNMEZ ◽  
Ayça Sarıalioğlu GÜNGÖR ◽  
Barış KARABULUT ◽  
Şeyda Hergüner SİSO
Keyword(s):  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Universal Adhesives ◽  
Bond Strengths ◽  
Tensile Bond Strengths
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