scholarly journals Marginal integrity and microleakage of direct and indirect composite inlays: SEM and stereomicroscopic evaluation

2005 ◽  
Vol 19 (4) ◽  
pp. 295-301 ◽  
Author(s):  
Carlos José Soares ◽  
Leonardo Celiberto ◽  
Paula Dechichi ◽  
Rodrigo Borges Fonseca ◽  
Luis Roberto Marcondes Martins
Keyword(s):  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Sem Analysis ◽  
Fluorescent Light ◽  
Single Bond ◽  
Running Water ◽  
Direct Technique ◽  
Indirect Composite ◽  
Indirect Technique ◽  
Composite Inlays

The aim of this study was to evaluate the microleakage of direct and indirect composite inlays by stereomicroscopy and scanning electron microscopy (SEM). Thirty bovine incisors were ground to obtain an incisal platform, simulating the occlusal surface of a human molar. Each tooth received two 8° proximal cavities with cervical finishing line prepared in dentine or enamel. One of the cavities was filled with Filtek Z250/Single Bond, using the direct technique, and the other was filled with with Solidex/Rely X ARC/Single Bond, using the indirect technique. The samples were stored in water at 37°C for 24 hours and placed in a 50% silver nitrate solution for 6 hours in a dark container. Next, the samples were washed under running water, immersed in a developing solution and exposed to fluorescent light for 12 hours. The teeth were then severed and evaluated for dye penetration by stereomicroscopy and SEM. There were no significant differences between the direct and indirect techniques for the cervical finishing line in enamel, but for the finishing line in dentin, the indirect technique allowed less microleakage than the direct technique. SEM analysis showed leakage similar to that observed by stereomicroscopic analysis. The use of stereomicroscopic and SEM evaluations improves microleakage analysis.

scholarly journals Direct-Indirect Technique Restoration for Non-Carious Cervical Lesions Treatment: a Case Report

2021 ◽  
Vol 23 (2) ◽  
pp. 131-135
Author(s):  
Antônio Pedro de Souza Júnior ◽  
Eric Felipe Saraiva Souto ◽  
Silvério Almeida Souza Torres ◽  
João Lima Rodrigues ◽  
Danilo Cangussu Mendes
Keyword(s):  
Case Report ◽  
Tooth Wear ◽  
Dentin Hypersensitivity ◽  
Cervical Lesions ◽  
Class V ◽  
Restorative Treatment ◽  
Direct Technique ◽  
Maxillary Premolars ◽  
Indirect Technique ◽  
Composite Inlays

AbstractNon-Carious Cervical Lesions are characterized by slow and progressive loss of hard tissue at the level of enamel-cement junction, without bacterial involvement. This work aimed to address a case report of restorative treatment in Class V cavities in multiple premolars using the direct-indirect technique with composite resin. A 42 year-old male patient presented for esthetic restorative treatment with the complaint of severe dentin hypersensitivity and wedged-shaped non-carious cervical lesions affecting the maxillary premolars. The restorative treatment chosen was a direct-indirect technique with composite performed into three sessions as follows: making the class V composite inlays, cementation, and final polishing. The direct-indirect technique as an alternative to the traditional direct technique has the benefits of a better contour of the restoration, since the finishing and polishing are made extraorally. Besides, the control of the polymerization stress and less discomfort to the patient are other advantages. In the case of direct-indirect class V restoration, the advantages far surpass those of the direct technique. Keywords: Hypersensitivity. Tooth Wear. Composites Resins ResumoAs Lesões Cervicais Não Cariosas se caracterizam pela perda lenta e progressiva de tecido duro próximo a junção cemento-esmalte, sem envolvimento bacteriano. Este trabalho tem o objetivo de relatar um caso clínico de tratamento restaurador em cavidades do tipo Classe V em pré-molares pela técnica direta-indireta com resina composta. Paciente do sexo masculino, 42 anos, queixava-se de forte sensibilidade e múltiplas Lesões Cervicais Não Cariosas na forma de cunha nos pré-molares superiores. O tratamento restaurador escolhido foi a técnica direta-indireta com resina composta realizado em três sessões distribuídas em confecção da peça em resina composta, cimentação e polimento final. A técnica direta-indireta surge como alternativa a técnica direta tradicional trazendo como benefícios um melhor contorno da restauração, uma vez que esta é acabada e polida fora da boca, além do controle do estresse de polimerização e menor desconforto ao paciente. A intervenção restauradora direta-indireta se mostra eficaz devido ao fato de conseguir contornar dificuldades encontradas em técnicas restauradoras diretas. Palavras-chave: Hipersensibilidade. Desgaste dos Dentes. Resinas Compostas

Nanoleakage in Hybrid Layer and Acid–Base Resistant Zone at the Adhesive/Dentin Interface

2015 ◽  
Vol 21 (5) ◽  
pp. 1271-1277 ◽  
Author(s):  
Toru Nikaido ◽  
Hamid Nurrohman ◽  
Tomohiro Takagaki ◽  
Alireza Sadr ◽  
Shizuko Ichinose ◽  
...  
Keyword(s):  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Adhesive System ◽  
Control Group ◽  
Fluorescent Light ◽  
Adhesive Systems ◽  
Acid Base ◽  
Hybrid Layer ◽  
Transmission Electron ◽  
Self Etch

AbstractThe aim of interfacial nanoleakage evaluation is to gain a better understanding of degradation of the adhesive–dentin interface. The acid–base resistant zone (ABRZ) is recognized at the bonded interface under the hybrid layer (HL) in self-etch adhesive systems after an acid–base challenge. The purpose of this study was to evaluate nanoleakage in HL and ABRZ using three self-etch adhesives; Clearfil SE Bond (SEB), Clearfil SE One (SEO), and G-Bond Plus (GBP). One of the three adhesives was applied on the ground dentin surface and light cured. The specimens were longitudinally divided into two halves. One half remained as the control group. The others were immersed in ammoniacal silver nitrate solution, followed by photo developing solution under fluorescent light. Following this, the specimens were subjected to acid–base challenges with an artificial demineralization solution (pH4.5) and sodium hypochlorite, and prepared in accordance with common procedures for transmission electron microscopy (TEM) examination. The TEM images revealed silver depositions in HL and ABRZ due to nanoleakage in all the adhesives; however, the extent of nanoleakage was material dependent. Funnel-shaped erosion beneath the ABRZ was observed only in the all-in-one adhesive systems; SEO and GBP, but not in the two-step self-etch adhesive system; SEB.

scholarly journals Effect of Minocycline on the Durability of Dentin Bonding Produced with Etch-and-Rinse Adhesives

2016 ◽  
Vol 41 (5) ◽  
pp. 511-519 ◽  
Author(s):  
AD Loguercio ◽  
R Stanislawczuk ◽  
P Malaquias ◽  
MF Gutierrez ◽  
J Bauer ◽  
...  
Keyword(s):  
Nitrate Solution ◽  
Water Storage ◽  
Silver Nitrate Solution ◽  
Control Group ◽  
Single Bond ◽  
Water Control ◽  
X Ray ◽  
Etch And Rinse ◽  
Group 2 ◽  
Scanning Electron

SUMMARY Objectives: To evaluate the effect of minocycline and chlorhexidine pretreatment of acid-etched dentin on the longevity of resin-dentin bond strength (μTBS) and nanoleakage of two-step etch-and-rinse adhesives. Methods: Before application of Prime & Bond NT and Adper Single Bond 2 in occlusal dentin, the dentin surfaces were treated with 37% phosphoric acid, rinsed, air-dried, and rewetted with water (control group), 2% minocycline, or 2% chlorexidine digluconate. Composite buildups were constructed incrementally, and specimens were longitudinally sectioned to obtain bonded sticks (0.8 mm2) to be tested in tension (0.5 mm/min) immediately or after 24 months of water storage. For nanoleakage, two specimens of each tooth/period were immersed in the silver nitrate solution, photo-developed, and polished with SiC paper for analysis under energy-dispersive X-ray spectroscopy/scanning electron microscopy. Results: Reductions of the μTBS and increases in the nanoleakage were observed for both adhesives when the rewetting procedure was performed with water. Stable bonds were observed for the 2% minocycline and 2% chlorexidine digluconate groups after 24 months. Conclusions: The use of 2% minocycline as pretreatment of acid-etched dentin is one alternative to retard the degradation of resin-dentin interfaces over a 24-month period as well as 2% chlorexidine digluconate.

scholarly journals Synthesis, characterization and antibacterial potential of silver nanoparticles by Morus nigra leaf extract

2013 ◽  
Vol 1 (04) ◽  
pp. 16-24 ◽  
Author(s):  
Anu Kumar ◽  
Kuldeep Kaur ◽  
Sarika Sharma
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Bacterial Species ◽  
Nitrate Solution ◽  
Average Particle Size ◽  
Silver Nitrate Solution ◽  
Sem Analysis ◽  
Average Particle ◽  
Morus Nigra ◽  
Uv Visible

The present study reports the synthesis of silver nanoparticle using Morus nigra leaf extract were used as reducing agent for reduction of silver nitrate solution. The synthesis of silver nanoparticles was analyzed by UV-Visible spectroscopy, Scanning Electron Microscopy. The SEM analysis has shown that size of silver nanoparticles synthesized from leaves extract of M.nigra was 200 nm and seems to be spherical in morphology. Morphology of chemically synthesized silver nanoparticles is nearly spherical and of size ranges from 300-500 nm. The average particle size analyzed from SEM analysis was observed to be 350 nm. This article has discussed the synthesis of silver nanoparticles generated from plant extract, characterization and antibacterial analysis. In this study the antibacterial activity was examined against six MTCC cultures collected from IMTECH Chandigarh, Including both gram positive and gram negative bacteria such as P.aeruginosa, S.aureus, B.subtilis, E.coli, P.flourescens and Streptococus mutans. Out of these strains the antimicrobial activity of the silver nanoparticles showed maximum zone of inbhition against P.flourescens (22 mm), P.aeruginosa (19 mm), S.aureus (18 mm) and least effective against E.coli (15mm). In contrast chemically synthesized silver nanoparticles were found most effective against S.aureus (13 mm) and B.subtilis (12mm) and almost ineffective against Streptococcus mutans (6 mm) and P.flourescens (4 mm). In the concluding remarks, the silver nanoparticles synthesized using M.nigra leaves extract would be a better antimicrobial effective against various bacterial species.

scholarly journals COMPREHENSIVE STUDY OF SILVER NANOPARTICLES OBTAINED FROM PINUS ROXBURGHII OBTAINED BY GREEN SYNTHESIS CHARACTERIZATION AND ANTIMICROBIAL APPLICATIONS.

2021 ◽  
Vol 5 (9) ◽  
Author(s):  
Minakshi Gajanan Pawar ◽  
Ramjan M. Mulani
Keyword(s):  
Quantum Dots ◽  
Antibacterial Agent ◽  
Red Wine ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Sem Analysis ◽  
Zone Of Inhibition ◽  
Pinus Roxburghii ◽  
Optical Absorption Peak ◽  
Comprehensive Study

The increasing resistance of microorganisms against antibiotics threatens the microbiologist. Quantum dots are found to be an excellent antibacterial agent against P. aeruginosa. In the present study pinus roxburghii collected from the Mahabaleshwar region of Maharashtra, India. The plants have been washed and dried in the shade for 10- 15 days. The 5 gm dried plant powder was boiled in 100ml of double distilled water, whose extract is used for, The titration of 1mmol silver nitrate solution. The change in color from pale yellow to red wine and, optical absorption peak in UV studies at 420 nm confirms existence of quantum dots. The morphology of the nanoparticles studied by FE-SEM analysis reveals, the particle size of 100 ± 40 nm. A good antimicrobial activity of obtained quantum dots, againstp. aeruginosa is evidenced with 17 mm in diameter a zone of inhibition. As p aeruginosa causes infection in wounds burns this study has recommended the use of quantum dots in ointments, lotions, and skin creams for early and safe recovery.

Electroless silver coating on glass stitched fabrics for electromagnetic shielding applications

2014 ◽  
Vol 84 (19) ◽  
pp. 2103-2114 ◽  
Author(s):  
Mehmet S Ersoy ◽  
Emel Onder
Keyword(s):  
Electromagnetic Interference ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Sem Analysis ◽  
Critical Threshold ◽  
Silver Coating ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
Fabric Surface ◽  
Emi Se

In this study silver nanoparticles were deposited by electroless coating onto glass-stitched fabrics via the Tollens’ reaction for technical textile applications. The effect of fabric compactness and the amount of silver nitrate solution on conductivity and electromagnetic interference shielding effectiveness (EMI SE) were studied. The results showed that a compact fabric surface promoted the EMI SE and that a critical threshold of surface conductivity of 0.3 S.cm–1 was required to obtain an EMI SE above 50 dB in the frequency range 300 MHz−1.5 GHz. Using SEM analysis we found that conductivity values were compatible with the coating thickness of samples. FT–IR analysis revealed that the presence of Ag particles caused the aliphatic C–H stretching frequencies (2858 and 2927 cm–1) to become shifted to higher values (2901 cm–1, and 2988 and 2972 cm–1, respectively).

scholarly journals Microwave-assisted green synthesis of silver nanoparticles using dried extracts of Chlorella vulgaris and antibacterial activity studies

2020 ◽  
Vol 9 (1) ◽  
pp. 283-293
Author(s):  
Milad Torabfam ◽  
Meral Yüce
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Chlorella Vulgaris ◽  
Metallic Nanoparticles ◽  
Nitrate Solution ◽  
Spherical Shape ◽  
Silver Nitrate Solution ◽  
Spectroscopy Analysis ◽  
Bacterial Diseases ◽  
Serovar Typhimurium

AbstractGreen synthesis of metallic nanoparticles (NPs) is acquiring considerable attention due to its environmental and economic superiorities over other methods. This study describes the practical synthesis of silver nanoparticles (AgNPs) through the reduction of silver nitrate solution using an algal source, Chlorella vulgaris, as the reducing as well as the stabilizing agent. The energy required for this synthesis was supplied by microwave radiation. The ultraviolet-visible spectroscopy exhibited a single peak related to the surface plasmon absorbance of AgNPs at 431 nm. The AgNPs with high stability (a zeta potential of −17 mV), hydrodynamic size distribution of 1–50 nm, and mostly spherical shape were obtained through a 10 min process. Fourier transform infrared spectroscopy analysis revealed that several functional groups, including carbonyl groups of C. vulgaris, play a significant role in the formation of functional NPs. Antibacterial features of the produced AgNPs were verified against those of Salmonella enterica subsp. enterica serovar typhimurium and Staphylococcus aureus, demonstrating a considerable growth inhibition at increasing concentrations of the NPs. As a result, the formed AgNPs can be used as a promising agent against bacterial diseases.

scholarly journals Antimicrobial Activity of Roselle-capped​ Silver​ Nanochip on Aggregatibacter actinomycetemcomitans

2021 ◽  
Author(s):  
Sirorat Wacharanad ◽  
Puncharee Thatree ◽  
Punchaya Yiemwattana ◽  
Penpitcha Paoprajak ◽  
Pimchanok Ngamsangiam ◽  
...  
Keyword(s):  
Nitrate Solution ◽  
Synthesis Method ◽  
Antimicrobial Effect ◽  
Silver Nitrate Solution ◽  
Aggregatibacter Actinomycetemcomitans ◽  
Microwave Assisted Synthesis ◽  
Alginate Gel ◽  
Diffusion Technique ◽  
Inhibition Zones ◽  
Time Kill

Abstract Objectives This article aimed to study the effects of the​ roselle-capped​ silver​ nanochip​ ​(SNP-Ro​ chip)​ against Aggregatibacter actinomycetemcomitans, and the toxicity of this film on fibroblast cells to develop this SNP-Ro chip into a local chemical for the treatment of periodontitis in the future. Materials and Methods Using a microwave-assisted synthesis method, silver​ nanoparticles (SNPs) were prepared from a silver nitrate solution and roselle extract as a reducing and capping agent. Then, SNP-Ro chips were fabricated by mixing a solution of SNP-Ro with alginate gel. The antimicrobial effect of the synthesized SNP-Ro chips was performed by the disc diffusion technique and time kill assay. The cytotoxic effect was also determined by the MTS assay. Statistical Analysis One-way analysis of variance (ANOVA) and Scheffe’s method were used to analyze the data for this experiment. Results All three ratios of the SNP-Ro chip produced inhibition zones ranging between 18.75 ± 2.08 and 19.03 ± 2.25 mm. In studying the killing time, the three groups of the SNP-Ro chips completely eradicated A. actinomycetemcomitans within 180 minutes. The percentage of the viable SNP-Ro chip-treated human gingival fibroblasts (HGFs) were significantly increased when compared with the alginate chip-treated cells (p < 0.05). Conclusion This study developed a new method for the deposition of SNPs in alginate gel to make a thin small chip for the sustained release of the SNPs in a periodontal lesion. Therefore, the SNP-Ro chip has the potential to be developed as an adjunctive locally delivered antimicrobial agent in periodontal therapy.

Sign in / Sign up

Export Citation Format

Share Document