scholarly journals Colorimetric Assessment of Surface Sealants for Discoloration of a Nanofilled Resin Composite

2020 ◽  
Author(s):  
Bora KORKUT
Keyword(s):  
Resin Composite ◽  
Surface Sealants

Effect of Surface Sealants and Polishing Time on Composite Surface Roughness and Microhardness

2018 ◽  
Vol 43 (4) ◽  
pp. 408-415 ◽  
Author(s):  
VC Ruschel ◽  
VS Bona ◽  
LN Baratieri ◽  
HP Maia
Keyword(s):  
Surface Roughness ◽  
Composite Resin ◽  
Resin Composite ◽  
Composite Surface ◽  
Force Microscopy ◽  
Atomic Force ◽  
Surface Sealants ◽  
Post Hoc ◽  
Surface Sealant ◽  
Effect Of Surface

SUMMARY The objective of this study was to evaluate the effect of surface sealants and polishing delay time on a nanohybrid resin composite roughness and microhardness. Eighty disc specimens were made with a nanohybrid resin (Esthet-X HD, Dentsply). The specimens were divided into two groups (n=40) according to polishing time: immediate, after 10 minutes; delayed, after 48 hours. Each group was subdivided into four groups (n=10), according to the surface treatment: CG, control–rubber points (Jiffy Polishers, Ultradent); PP, rubber points + surface sealant (PermaSeal, Ultradent); PF, rubber points + surface sealant (Fortify, Bisco); PB, rubber points + surface sealant (BisCover, Bisco). Surface roughness (Ra) and microhardness (50 g/15 seconds) were measured. Surface morphology was analyzed by scanning electron microscopy and atomic force microscopy. The data were analyzed statistically using one-way analysis of variance and the Games-Howell post hoc test (α=0.05). PermaSeal roughness (G2) in the delayed polishing group was significantly higher (p=0.00) than that of the other groups. No difference was observed among the groups between immediate and delayed polishing (p=1.00), except for PermaSeal (p=0.00). Moreover, PermaSeal showed the lowest microhardness values (p=0.00) for immediate polishing. Microhardness was higher at delayed polishing for all the surface treatments (p=0.00) except Fortify (p=0.73). Surface smoothness similar to polishing with rubber points was achieved when surface sealants were used, except for PermaSeal surface sealant, which resulted in a less smooth resin composite surface. However, surface sealant application did not significantly improve composite resin microhardness.

Effect of Surface Sealants on Marginal Microleakage in Class V Resin Composite Restorations

2009 ◽  
Vol 21 (6) ◽  
pp. 397-404 ◽  
Author(s):  
SORAIA VELOSO SILVA SANTANA ◽  
ANTONIO CARLOS BOMBANA ◽  
FLÁVIA MARTÃO FLÓRIO ◽  
ROBERTA TARKANY BASTING
Keyword(s):  
Resin Composite ◽  
Class V ◽  
Composite Restorations ◽  
Surface Sealants ◽  
Effect Of Surface

scholarly journals The effect of surface sealants with different filler content on microleakage of Class V resin composite restorations

2016 ◽  
Vol 10 (02) ◽  
pp. 163-169 ◽  
Author(s):  
Ozge Kam Hepdeniz ◽  
Ugur Burak Temel ◽  
Muhittin Ugurlu ◽  
Ozgur Koskan
Keyword(s):  
Filler Content ◽  
Resin Composite ◽  
Adhesive System ◽  
Alternative Methods ◽  
Control Group ◽  
Test Results ◽  
Class V ◽  
Composite Restorations ◽  
Surface Sealants ◽  
Effect Of Surface

ABSTRACT Objective: Microleakage is still one of the most cited reasons for failure of resin composite restorations. Alternative methods to prevent microleakage have been investigated increasingly. The aim of this study is to evaluate the microleakage in Class V resin composite restorations with or without application of surface sealants with different filler content. Materials and Methods: Ninety-six cavities were prepared on the buccal and lingual surfaces with the coronal margins located in enamel and the cervical margins located in dentin. The cavities restored with an adhesive system (Clearfil SE Bond, Kuraray, Tokyo, Japan) and resin composite (Clearfil Majesty ES-2, Kuraray, Tokyo, Japan). Teeth were stored in distilled water for 24 h and separated into four groups according to the surface sealants (Control, Fortify, Fortify Plus, and G-Coat Plus). The teeth were thermocycled (500 cycles, 5–55°C), immersed in basic fuchsine, sectioned, and analyzed for dye penetration using stereomicroscope. The data were submitted to statistical analysis by Kruskal–Wallis and Bonferroni–Dunn test. Results: The results of the study indicated that there was minimum leakage at the enamel margins of all groups. Bonferroni–Dunn tests revealed that Fortify and GC-Coat groups showed significantly less leakage than the Control group and the Fortify Plus group at dentin margins in lingual surfaces (P < 0.05). Conclusion: The all surface sealants used in this study eliminated microleakage at enamel margins. Moreover, unfilled or nanofilled surface sealants were the most effective in decreasing the degree of marginal microleakage at dentin margins. However, viscosity and penetrability of the sealants could be considered for sealing ability besides composition.

Effect of New Generation Surface Sealants on the Marginal Permeability of Class V Resin Composite Restorations

10.2341/05-77 ◽  
2006 ◽  
Vol 31 (4) ◽  
pp. 481-488 ◽  
Author(s):  
B. M. Owens ◽  
W. W. Johnson
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class V ◽  
Composite Restorations ◽  
Marginal Integrity ◽  
Surface Sealants ◽  
New Generation

Clinical Relevance Surface sealants, when applied to Class V resin composite restorations, can contribute to a significant reduction in microleakage, thus enhancing marginal integrity.

Silicification of wood-cell walls

1994 ◽  
Vol 52 ◽  
pp. 428-429
Author(s):  
S. E. Keckler ◽  
D. M. Dabbs ◽  
N. Yao ◽  
I. A. Aksay
Keyword(s):  
Electron Microscopy ◽  
Cell Wall ◽  
Cell Walls ◽  
Lignin Content ◽  
Resin Composite ◽  
Middle Lamella ◽  
Cellulose Fibers ◽  
Complex Structures ◽  
Rich Region ◽  
Inorganic Precursors

Cellular organic structures such as wood can be used as scaffolds for the synthesis of complex structures of organic/ceramic nanocomposites. The wood cell is a fiber-reinforced resin composite of cellulose fibers in a lignin matrix. A single cell wall, containing several layers of different fiber orientations and lignin content, is separated from its neighboring wall by the middle lamella, a lignin-rich region. In order to achieve total mineralization, deposition on and in the cell wall must be achieved. Geological fossilization of wood occurs as permineralization (filling the void spaces with mineral) and petrifaction (mineralizing the cell wall as the organic component decays) through infiltration of wood with inorganics after growth. Conversely, living plants can incorporate inorganics into their cells and in some cases into the cell walls during growth. In a recent study, we mimicked geological fossilization by infiltrating inorganic precursors into wood cells in order to enhance the properties of wood. In the current work, we use electron microscopy to examine the structure of silica formed in the cell walls after infiltration of tetraethoxysilane (TEOS).

Postoperative sensitivity associated with resin composite restorations

ORL ro ◽  
2018 ◽  
Vol 4 (41) ◽  
pp. 45
Author(s):  
Irina-Maria Gheorghiu ◽  
Loredana Mitran ◽  
Mihai Mitran ◽  
Anca-Nicoleta Temelcea ◽  
Sânziana Scărlătescu ◽  
...  
Keyword(s):  
Resin Composite ◽  
Composite Restorations ◽  
Postoperative Sensitivity
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