scholarly journals Effect of thermo-mechanical load cycling on silorane-based composite restorations

2012 ◽  
Vol 31 (6) ◽  
pp. 1054-1059 ◽  
Author(s):  
Ana Flávia Sanches BORGES ◽  
Juliete de Sousa SANTOS ◽  
Carla Müller RAMOS ◽  
Sérgio Kiyoshi ISHIKIRIAMA ◽  
Mirela Sanae SHINOHARA
Keyword(s):  
Mechanical Load ◽  
Composite Restorations ◽  
Load Cycling

Effect of light polymerization time, mode, and thermal and mechanical load cycling on microleakage in resin composite restorations

2013 ◽  
Vol 29 (2) ◽  
pp. 545-550 ◽  
Author(s):  
Giulliana Panfiglio Soares ◽  
Glaucia Maria Bovi Ambrosano ◽  
Debora Alves Nunes Leite Lima ◽  
Giselle Maria Marchi ◽  
Lourenço Correr-Sobrinho ◽  
...  
Keyword(s):  
Mechanical Load ◽  
Resin Composite ◽  
Polymerization Time ◽  
Composite Restorations ◽  
Load Cycling ◽  
Effect Of Light

Influence of Thermal and Mechanical Load Cycling on Microtensile Bond Strengths of Total and Self-etching Adhesive Systems

10.2341/05-20 ◽  
2006 ◽  
Vol 31 (2) ◽  
pp. 240-247 ◽  
Author(s):  
F. H. O. Mitsui ◽  
A. R. Peris ◽  
A. N. Cavalcanti ◽  
G. M. Marchi ◽  
L. A. F. Pimenta
Keyword(s):  
Bond Strength ◽  
Clinical Relevance ◽  
Mechanical Load ◽  
Adhesive System ◽  
Adhesive Systems ◽  
System Type ◽  
Load Cycling ◽  
Bond Strengths

Clinical Relevance Bond strength is affected by the combination of thermal and mechanical load cycling. However, results vary greatly with the number of mechanical cycles and adhesive system type (total or self-etching).

Effects of Load Cycling on the Microleakage of Beveled and Nonbeveled Margins in Class V Resin-Based Composite Restorations

2010 ◽  
Vol 11 (5) ◽  
pp. 25-32 ◽  
Author(s):  
Hamideh Ameri ◽  
Marjaneh Ghavamnasiri ◽  
Ehsan Abdoli
Keyword(s):  
High Speed ◽  
Class V ◽  
Significance Level ◽  
Gingival Margin ◽  
Composite Restorations ◽  
Nail Polish ◽  
Significant Difference ◽  
Load Cycling ◽  
Composite Restoration

Abstract Aim This study evaluated the influence of mechanical loading and thermocycling on microleakage of class V resin-based composite restorations with and without enamel bevel. Methods and Materials Sixty class V cavity preparations measuring 3.0 mm wide (mesiogingivally) x 2.0 mm high (occluso-gingivally) x 1.5 mm deep with the occlusal margin in enamel and the gingival margin in cementum were prepared on the buccal surfaces of human premolars using a #12 diamond round bur (Drendel & Zweiling Diamant GmbH, Lemgo, Germany) in a high-speed, water-cooled handpiece. The specimens were then divided into two groups of 30 specimens each, based on the type of enamel cavosurface margin configuration as beveled or nonbeveled (butt joint). After restoring the preparations with a flowable resin-based composite (Tetric Flow, Ivoclar Vivadent-AG, Schaan, Liechtenstein) and finishing and polishing with sequential discs (Sof-Lex Pop-on, 3M-ESPE, St. Paul, MN, USA), the teeth were stored at 37°C and 100 percent humidity. Twenty-four hours later, half of the specimens in each group (nonbeveled “N” or beveled “B”) were exposed to a cycling loading for 250,000 cycles to simulate occlusal loading and assigned to two subgroups (NL+ or BL+), while the remainder of the specimens in each group were only maintained in a 100-percent-humidity environment, without any cyclical loading, until tested (NL– or BL–). The specimens were sealed with sticky wax (Kemdent, Associated Dental Products, Swindon, UK) and nail polish. The apical foramen of each tooth was sealed with sticky wax and the rest of the tooth was covered with nail varnish, except for an area within 1.0 mm around the composite restoration. To detect marginal leakage, all of the samples were stored in a 0.5 percent basic fuchsine solution for 24 hours. The specimens were then sectioned longitudinally using a low-speed diamond blade (IsoMet, Buehler Ltd., Lake Bluff, IL, USA), machined, and evaluated under 25X magnification using a stereomicroscope (M9, Wild Heerbrugg, Switzerland). The specimens were scored on a scale from 1 to 4 on the degree of dye penetration. The qualitative data were analyzed by the Mann- Whitney U test at a 5 percent significance level (p<0.05). The null hypothesis of this study was that there is no difference in microleakage between beveled and nonbeveled class V buccal preparations in premolar teeth restored with resinbased composite and subjected to simulated occlusal loading and thermocycling. Results In each group the gingival margin showed significantly more microleakage than the enamel margin (p<0.05). Load cycling did not result in an increase in microleakage in nonbeveled (p=0.259) or in beveled (p=0.053) occlusal margins. However, the gingival margins showed a statistically significant difference in microleakage after load cycling whether in cavities with enamel occlusal bevel (p=0.004) or in groups without a bevel. This means the enamel margin configuration of the enamel occlusal margin had no effect on decreasing microleakage in the gingival aspect of class V composite restorations. In general, the nonbeveled preparations in this study had significantly less microleakage than the bevel specimens whether they were loaded occlusally or not (p=0.001). Clinical Significance Within the limitations of this in vitro study, no benefit was derived from placing an enamel cavosurface bevel on the occlusal margin of a standardized class V composite restoration located at the cementoenamel junction. The most important consideration is to prevent microleakage along the gingival margin regardless of whether the occlusal enamel margin is beveled. Citation Ameri H, Ghavamnasiri M, Abdoli E. Effects of load cycling on the microleakage of beveled and nonbeveled occlusal margins in class V resin-based composite restorations. J Contemp Dent Pract [Internet]. 2010 October; 11(5):025- 032. Available from: http://www.thejcdp.com/ journal/view/volume11-issue5-ghavamnasiri

Effect of storage times and mechanical load cycling on dentin bond strength of conventional and self-adhesive resin luting cements

2014 ◽  
Vol 111 (5) ◽  
pp. 404-410 ◽  
Author(s):  
Thaiane R. Aguiar ◽  
Carolina B. André ◽  
Lourenço Correr-Sobrinho ◽  
César A.G. Arrais ◽  
Gláucia M.B. Ambrosano ◽  
...  
Keyword(s):  
Bond Strength ◽  
Mechanical Load ◽  
Adhesive Resin ◽  
Luting Cements ◽  
Load Cycling ◽  
Storage Times

Strain Transfer Analysis of Integrated Surface Acoustic Wave Sensors

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Jochen Hempel ◽  
Sohaib Anees ◽  
Elena Zukowski ◽  
Michael Berndt ◽  
Jürgen Wilde ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Elevated Temperatures ◽  
Mechanical Load ◽  
Strain Sensor ◽  
3D Fem ◽  
Strain Transfer ◽  
Transfer Ratio ◽  
Bond Layer ◽  
Load Cycling

This paper presents a strain transfer investigation for Surface Acoustic Wave (SAW) strain sensors. For evaluation, a SAW strain sensor is assembled with a pretested bond material for potentially high strain transfer on a test holder. The setup is stressed with an axially homogeneous strain up to 500 ppm. The strain transfer ratio is computed from the applied load, the reference measurements with foil strain gauge, and the measured SAW strain sensor signal. The strain transfer performance of the bond material is also investigated with respect to the temperature dependency in the range between 22 °C and 85 °C. At these elevated temperatures an average strain transfer ratio of 0.606 ± 0.7% was measured. Mechanical load cycling tests up to 1000 cycles are used for the evaluation of the elastic fatigue of the bond material. The effects of mechanical load cycling and aging of the bond layer are analyzed with the SAW strain sensor response. After 1000 mechanical load cycles, the transferred strain into the SAW strain sensor is 0.582 ± 0.153%. Finally, the experimental results are compared with the results of a 3D FEM simulation which are deviating by less than 10%.

scholarly journals Microleakage evaluation of composite restorations submitted to load cycling

2010 ◽  
Vol 7 (4) ◽  
Author(s):  
Luis Felipe Jochims Schneider ◽  
Rubens Nisie Tango ◽  
Fábio Machado Milan ◽  
George Valdemar Mundstock ◽  
Simonides Consani ◽  
...  
Keyword(s):  
Composite Restorations ◽  
Load Cycling

scholarly journals Challenging the Resin-Zirconia Interface by Thermal Cycling or Mechanical Load Cycling or Their Combinations

2020 ◽  
Vol 10 (20) ◽  
pp. 7352
Author(s):  
Sung-Min Kwon ◽  
Young Kyung Kim ◽  
Tae-Yub Kwon
Keyword(s):  
Thermal Cycling ◽  
Mechanical Load ◽  
In Vitro Study ◽  
Resin Cements ◽  
Mechanical And Physical Properties ◽  
Load Cycling ◽  
Bonding Area ◽  
Before And After ◽  
Aging Conditions

The purpose of this in vitro study was to evaluate the influence of mechanical load cycling (MLC), which simulated mastication, alone or combined with thermal cycling (TC), on the resin shear bond strength (SBS) to zirconia. Two resin cements (Panavia F2.0 and RelyX U200) were bonded (bonding area: 2.38 mm) to air-abraded zirconia (Everest ZS-Ronde). The specimens were subjected to SBS test before and after TC (5000 cycles), MLC (5000 cycles in 37 °C water), TC/MLC, or MLC/TC aging (n = 15). Before SBS test, the mechanical and physical properties of the two resin cements were studied (n = 5). For both resins, unlike TC (p > 0.05), the three MLC-containing aging conditions significantly decreased the SBS values when compared to the non-aged condition (p < 0.05). In the case of MLC-only aging, RelyX U200, with significantly higher hydrophobicity (p = 0.004), showed a significantly higher SBS value than Panavia F2.0 (p = 0.035). The MLC aging-containing groups showed increased occurrence of mixed failure. The application of MLC combined with TC may more closely simulate intraoral conditions.

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