Degree of Conversion and Contraction Stress Development of a Resin Composite Irradiated Using Halogen and LED at Two C-factor Levels

10.2341/08-32 ◽  
2009 ◽  
Vol 34 (1) ◽  
pp. 24-31 ◽  
Author(s):  
L. G. Cunha ◽  
R. C. B. Alonso ◽  
A. C. C. Neves ◽  
M. F. de Goes ◽  
J. L. Ferracane ◽  
...  
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Degree Of Conversion ◽  
Stress Rate ◽  
Stress Generation ◽  
Stress Development ◽  
Curing Methods ◽  
Contraction Stress ◽  
Lower Irradiance

Clinical Relevance Curing methods using lower irradiance levels were shown to be effective in reducing the rate of stress generation without compromising the conversion of the restorative composite. Higher C-factor was shown to enhance the stress rate and amount of stress generated.

Post-gel Shrinkage Strain and Degree of Conversion of Preheated Resin Composite Cured Using Different Regimens

2010 ◽  
Vol 35 (2) ◽  
pp. 172-179 ◽  
Author(s):  
D. I. El-Korashy
Keyword(s):  
Clinical Relevance ◽  
Negative Impact ◽  
Resin Composite ◽  
Shrinkage Strain ◽  
Degree Of Conversion ◽  
Soft Start

Clinical Relevance The preheating of resin composite prior to curing yielded a better degree of conversion but had a negative impact on the induced post-gel shrinkage strain; soft-start mode is recommended, as it reduces the post-gel shrinkage strain without affecting the degree of conversion.

scholarly journals The Effect of Soft-start Polymerization by Second Generation LEDs on the Degree of Conversion of Resin Composite

10.2341/06-45 ◽  
2007 ◽  
Vol 32 (2) ◽  
pp. 160-165 ◽  
Author(s):  
L. E. S. Soares ◽  
P. C. S. Liporoni ◽  
A. A. Martin
Keyword(s):  
Clinical Relevance ◽  
Second Generation ◽  
Resin Composite ◽  
Organic Matrix ◽  
Degree Of Conversion ◽  
Resin Composites ◽  
Photo Polymerization ◽  
Soft Start ◽  
Halogen Light ◽  
Restoration Failure

Clinical Relevance Photo-polymerization using second generation LED and halogen light in the soft-start mode of curing was able to produce an adequate degree of conversion in resin composites. The lower degree of conversion produced by low power LED in the soft-start mode could lead to restoration failure, degradation of the organic matrix and recurrent caries.

scholarly journals Influence of curing duration and mixing techniques of bulk fill resin composites on bi-axial flexural strength and degree of conversion

2020 ◽  
Vol 18 ◽  
pp. 228080002097572
Author(s):  
Thamer Almohareb ◽  
Abdulaziz A Alayed ◽  
Khalid M. Alzahrani ◽  
Ahmed M Maawadh ◽  
Basil Almutairi ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Flexural Strength ◽  
Statistical Data ◽  
Resin Composite ◽  
Degree Of Conversion ◽  
Resin Composites ◽  
Photo Polymerization ◽  
Biaxial Flexural Strength ◽  
Curing Methods ◽  
Mixing Techniques

Objectives: The aim was to assess the influence of polymerization duration, method and resin manipulation techniques on the biaxial flexural strength (BFS) and degree of conversion (DC) of bulk fill resin composites (BFRC). Methods: One hundred and eighty disc specimens were fabricated using MultiCore (MC) and Core-It (CI) bulk fill resin composite. Each material group, specimens were divided into nine subgroups based on curing methods (Light cure for 10 and 20 s; and auto-cure) and mixing techniques (first auto-mix, second automix, and hand mix). BFS was tested with a ball indenter at a crosshead speed of 0.50 mm/min. DC was assessed for MC and CI materials for 10 s and 20 s light cure; and auto cure specimens using Fourier Transform-Infrared Spectroscopy (FTIR). Statistical data comparisons were performed using ANOVA, Bonferroni and Tukey-Kramer tests. Results: For MC and CI, BFS was highest in 10 s light cure specimens, however comparable to specimens cured for 20 s ( p > 0.05). Auto cure specimens showed lower BFS than light cured samples for both materials ( p < 0.05). Hand mixed specimens showed significantly compromised BFS compared to automix technique for MC and CI. DC % was comparable for 10 s and 20 s light cure methods for both materials ( p > 0.05), which was higher than DC % of auto cure bulk fill resins ( p < 0.05). CI showed higher DC % and BFS compared to MC bulk fill resin composite. Conclusion: Photo-polymerization duration of 10 and 20 s showed similar outcomes for BFS and DC %; and BFS for auto-mixed resins (MC and CI) was significantly higher than hand mixed resin. BFS and DC was higher in photopolymerized groups as compared to auto-cured resin regardless of the manipulation technique for both materials (MultiCore and Core it).

Effect of Time and Polymerization Cycle on the Degree of Conversion of a Resin Composite

10.2341/05-81 ◽  
2006 ◽  
Vol 31 (4) ◽  
pp. 489-495 ◽  
Author(s):  
L. F. J. Schneider ◽  
S. Consani ◽  
F. Ogliari ◽  
A. B. Correr ◽  
L. C. Sobrinho ◽  
...  
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Degree Of Conversion ◽  
Activation Condition ◽  
Composite Properties

Clinical Relevance Initial and final resin composite properties will depend on the photo-activation condition applied.

Effect of LED Light-Curing Spectral Emission Profile on Light-Cured Resin Cement Degree of Conversion

2020 ◽  
Author(s):  
RQ Ramos ◽  
RR Moraes ◽  
GC Lopes
Keyword(s):  
Clinical Relevance ◽  
Degree Of Conversion ◽  
Resin Cement ◽  
Light Activation ◽  
Spectral Emission ◽  
Led Light ◽  
Emission Profile ◽  
Light Curing

Clinical Relevance The use of multipeak LED light-curing guarantees efficiency on light activation of Ivocerin-containing light-cured resin cement.

scholarly journals The Influence of Cement Layer Thickness on the Stress State of Metal Inlay Restorations—Photoelastic Analysis

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 599
Author(s):  
Grzegorz Sokolowski ◽  
Michal Krasowski ◽  
Agata Szczesio-Wlodarczyk ◽  
Bartlomiej Konieczny ◽  
Jerzy Sokolowski ◽  
...  
Keyword(s):  
Stress State ◽  
Layer Thickness ◽  
Resin Composite ◽  
Water Immersion ◽  
Cylindrical Sample ◽  
Resin Cement ◽  
Adhesive Resin ◽  
Cement Layer ◽  
Contraction Stress ◽  
Photoelastic Analysis

The successful restoration of teeth requires a good connection between the inlay and natural tissue. A strong bond may improve retention and reinforce tooth structure. The purpose of this study was to evaluate the influence of cement layer thickness on contraction stress generated during photopolymerization, and to determine the changes in stress state of the cement occurring during aging in water (over 84 days). Two cements were used: resin composite cement (NX3) and self-adhesive resin cement (Maxcem Elite Chroma). A cylindrical sample made of CuZn alloy was used to imitate the inlay. The stress state was measured by photoelastic analysis. The contraction stress of the inlay restoration was calculated for cement layer thicknesses of 25 µm, 100 µm, 200 µm, and 400 µm. For both tested materials, the lowest contraction stress was observed for the thinnest layer (25 µm), and this increased with thickness. Following water immersion, a significant reduction in contraction stress was observed due to hygroscopic expansion. Applying a thin layer (approximately 25 µm) of composite and self-adhesive resin cements resulted in high levels of expansion stresses (over −6 MPa) after water aging.

scholarly journals Comparison of Proximal Contacts of Class II Resin Composite Restorations In Vitro

2006 ◽  
Vol 31 (6) ◽  
pp. 688-693 ◽  
Author(s):  
B. A. C. Loomans ◽  
N. J. M. Opdam ◽  
F. J. M. Roeters ◽  
E. M. Bronkhorst ◽  
R. C. W. Burgersdijk
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Composite Restorations ◽  
Composite Restoration

Clinical Relevance When placing a Class II resin composite restoration, the use of sectional matrix systems and separation rings to obtain tight proximal contacts is recommended.

Bond Strength Comparison of Amalgam Repair Protocols Using Resin Composite in Situations With and Without Dentin Exposure

2010 ◽  
Vol 35 (6) ◽  
pp. 655-662 ◽  
Author(s):  
M. Özcan ◽  
G. Schoonbeek ◽  
B. Gökçe ◽  
E. Çömlekoglu ◽  
M. Dündar
Keyword(s):  
Bond Strength ◽  
Clinical Relevance ◽  
Resin Composite ◽  
Amalgam Restorations

Clinical Relevance For reliable repair of amalgam restorations, including dentin fractures, the amalgam surface should first be silica coated; dentin/enamel should be etched, washed and rinsed thoroughly. Then, amalgam should be silanized and primer/bonding should be applied onto dentin.

Gingival Microleakage of Class II Resin Composite Restorations with Fiber Inserts

10.2341/06-86 ◽  
2007 ◽  
Vol 32 (3) ◽  
pp. 298-305 ◽  
Author(s):  
O. El-Mowafy ◽  
W. El-Badrawy ◽  
A. Eltanty ◽  
K. Abbasi ◽  
N. Habib
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Composite Restorations ◽  
Fiber Inserts

Clinical Relevance Fiber inserts incorporated at the gingival floor of Class II composite restorations resulted in a significant reduction of microleakage scores as compared to restorations made without inserts. This may lead to a reduced incidence of recurrent caries.

scholarly journals Relationship between the degree of conversion, solubility and salivary sorption of a hybrid and a nanofilled resin composite

2008 ◽  
Vol 16 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Eduardo Moreira da Silva ◽  
Giselle Soares Almeida ◽  
Laiza Tatiana Poskus ◽  
José Guilherme Antunes Guimarães
Keyword(s):  
Resin Composite ◽  
Degree Of Conversion
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