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Tensile Bond Strength (tensile + bond_strength)

Distribution by Scientific Domains

Medical Sciences	81%

Selected Abstracts

ONE-YEAR TENSILE BOND STRENGTHS OF TWO SELF-ETCHING PRIMERS TO BOVINE ENAMEL

JOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 4 2004
John M. Powers PhD
[source]

Tensile bond strengths of four different dentin adhesives on irradiated and non-irradiated human dentin in vitro

JOURNAL OF ORAL REHABILITATION, Issue 9 2001
C. R. Gernhardt
This study evaluated the influence of irradiation on dentin bond strength. Sixty irradiated and 60 non-irradiated human third molars were used. The irradiation dose of 60 Gy was fractionally applied over 6 weeks (2 Gy day,1, 5 days week,1). All teeth were prepared in a special manner allowing the simulation of intra-pulpal pressure and dentin perfusion. Dentin specimens with a thickness of 2·0 mm were obtained under standardized conditions. The specimens were randomly assigned to four experimental groups. Tensile bond strength of four different dentin bonding agents (ScotchbondÔ 1, Solobond Plus®, Prime&BondÔ 2·1 and Syntac®) was evaluated using an Instron Universal testing machine. Pairwise comparison did not show any significant differences between the irradiated and non-irradiated groups. The influence of the different dentin adhesives was significant (P=0·0001; ANOVA). Compared with Solobond Plus® and Prime&BondÔ 2·1, the use of ScotchbondÔ 1 resulted in a significantly higher tensile bond strength in non-irradiated specimen (P< 0·05; closed test procedure based on Kruskal,Wallis test). Within the limitations of an in vitro study, it can be concluded that adhesive restoration procedures can be successfully used in patients irradiated for cancer of the head and neck. [source]

Tensile bond strength of a flowable composite resin to ER:YAG-laser-treated dentin,

LASERS IN SURGERY AND MEDICINE, Issue 5 2005
Juliana Donadio-Moura MSD
Abstract Background and Objectives This in vitro study evaluated the influence of a flowable composite resin (FCR) on the tensile bond strength of resin to dentin treated with the Er:YAG Laser (L) and diamond bur (DB). Study Design/Materials and Methods Ninety dentin surfaces obtained from 45 third molars were ground and randomly divided into six groups (n,=,15): G1,DB, G2,DB+FCR, G3,L (100 mJ, 10 Hz, 37.04 J/cm2), G4,L (100 mJ, 10 Hz, 37.04 J/cm2)+FCR, G5,L (250 mJ, 2 Hz, 92.60 J/cm2), and G6,L (250 mJ, 2 Hz, 92.60 J/cm2)+FCR. After surface etching with 37% phosphoric acid and the application of an adhesive system, inverted conical specimens were prepared with a hybrid composite resin. In groups G2, G4, and G6 a FCR was placed before the hybrid composite resin. After 24 hours-storage in distilled water, the tensile test was performed in a universal testing machine (0.5 mm/minute, 500 N). Results Data were submitted to Kruskal Wallis test (P,=,0.01). The mean bond strength values (MPa±SD) were: G1,13.54 (±2.99), G2,14.67 (±2.32), G3,9.49 (±3.09), G4,14.60 (±2.76), G5,8.97 (±3.89), and G6,13.02 (±2.18). Groups G1 and G2 presented the highest bond strength values, which were statistically similar to those of G4 and G6. The groups treated with laser and without the FCR (G3 and G5) showed the lowest shear bond strength values. Conclusions FCR can increase the adhesion to dentin treated with Er:YAG laser within different parameters. © 2005 Wiley-Liss, Inc. [source]

Tensile bond strengths of four different dentin adhesives on irradiated and non-irradiated human dentin in vitro

An In Vitro Investigation of a Comparison of Bond Strengths of Composite to Etched and Air-Abraded Human Enamel Surfaces

JOURNAL OF PROSTHODONTICS, Issue 1 2006
G.B. Gray BDS
Purpose: The purposes of the study were to measure the tensile bond strength of composite resin to human enamel specimens that had been either etched or air-abraded, and to compare the quality of the marginal seal, through the assessment of microleakage, of composite resin to human enamel specimens that had been either etched or air-abraded. Materials and Methods: Thirty mandibular molar teeth were decoronated and sectioned mesio-distally to produce six groups, each containing ten specimens that were embedded in acrylic resin using a jig. In each of the four treatment groups, the specimen surfaces were treated by either abrasion with 27 or 50 ,m alumina at 4 mm or 20 mm distance, and a composite resin was bonded to the treated surfaces in a standardized manner. In the two control groups the specimens were treated with 15 seconds exposure to 36% phosphoric acid gel and then similarly treated before being stored in sterile water for 1 week. All specimens were then subjected to tensile bond strength testing at either 1 or 5 mm/min crosshead speed. For the microleakage study, the degree of dye penetration was measured 32 times for each treatment group, using a neutral methylene blue dye at the interface between composite and either 27 or 50 ,m air-abraded tooth structure or etched enamel surfaces. Results: The mean bond strength values recorded for Group 1 (phosphoric acid etch, 5 mm/min crosshead speed) was 25.4 MPa; Group 2 (phosphoric acid etch, 1 mm/min), 22.2 MPa; Group 3 (27 ,m alumina at 4 mm distance), 16.8 MPa; Group 4 (50 ,m alumina at 4 mm distance), 16.9 MPa; Group 5 (27 ,m alumina at 20 mm distance), 4.2 MPa; and for Group 6 (50 ,m alumina at 20 mm distance) 3.4 MPa. An analysis of variance (ANOVA) demonstrated significant differences among the groups, and a multiple comparison test (Tukey) demonstrated that conventionally etched specimens had a greater bond strength than air-abraded specimen groups. No significant difference in dye penetration could be demonstrated among the groups (p= 0.58). Conclusions: Composite resin applied to enamel surfaces prepared using an acid etch procedure exhibited higher bond strengths than those prepared with air abrasion technology. The abrasion particle size did not affect the bond strength produced, but the latter was adversely affected by the distance of the air abrasion nozzle from the enamel surface. The crosshead speed of the bond testing apparatus had no effect on the bond strengths recorded. The marginal seal of composite to prepared enamel was unaffected by the method of enamel preparation. [source]

Microtensile bond strength of different adhesive systems in dentin irradiated with Er:YAG laser

LASER PHYSICS LETTERS, Issue 7 2008
L.M.G. Sierpinsky
Abstract The objective this study was to evaluate in vitro the bond strength of two etch-and-rise and one self-etching adhesive system after dentin irradiation with Er:YAG (erbium: yttrium aluminum garnet) laser using microtensile test. The results revealed that the groups treated with laser Er:YAG presented less tensile bond strength, independently to the adhesive system used. The prompt L-pop adhesive presented less microtensile bond strength compared to the other adhesives evaluated. There was no difference between single bond and excite groups. The adhesive failures were predominant in all the experimental groups. The Er:YAG laser influenced negatively bond strength values of adhesive systems tested in dental substrate. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Tensile bond strength of a flowable composite resin to ER:YAG-laser-treated dentin,

Adhesion of Er:YAG laser-irradiated dentin and composite resins: Application of various treatments on irradiated surface

LASERS IN SURGERY AND MEDICINE, Issue 4 2002
Toru Eguro DDS
Abstract Background and Objectives The investigation of adhesion between an Er:YAG laser-irradiated surface and composite resin is very important to ensure the best clinical results. The purpose of this investigation is to determine if the application of various treatments on Er:YAG laser-irradiated dentin surface affects the tensile bond strength between dentin and composite resins. Study Design/Materials and Methods In this investigation, the application of phosphoric acid, ultrasonic scaler, air-scaler, and air-powder polisher were tested as techniques to increase the bond strength of composite resins to Er:YAG laser-irradiated dentin surface. Results The tensile bond strength of the air-powder polished group was highest, at 18.45,±,3.72 MPa, and the lowest value was that of the only laser-irradiated group, at 12.56,±,4.38 MPa. Conclusions The bond strengths in treated with air-powder polished group and phosphric acid etched group were significantly higher than that of the group in laser irradiation alone. Lasers Surg. Med. 30:267,272, 2002. © 2002 Wiley-Liss, Inc. [source]

Untersuchungen hinsichtlich der Dauerhaftigkeit von Wärmedämmverbundsystemen (WDVS) mit Holzfaserdämmplatten

BAUPHYSIK, Issue 4 2009
Norbert Rüther Dipl.
Wärme; Versuche; thermal insulation and heat; experimental set-up Abstract Der Schutz der Dämmstoffe von WDVS vor Umwelteinflüssen wird hauptsächlich durch das Putzssystem sichergestellt. Haftet dieses nicht mehr am Dämmstoff, so sind umfangreiche Sanierungsmaßnahmen erforderlich. Mit Hilfe von Haftzugprüfungen aus künstlich gealterten Proben sollten Prognosen über die Dauerhaftigkeit unter realen Bedingungen abgeleitet werden. Es wurde festgestellt, dass die Festigkeit von Platten mit hoher Anfangsfestigkeit über die Zeit um etwa 25 % geringer wird, dann jedoch auf dem Festigkeitsniveau verbleibt. Bei Platten mit niedriger Anfangsfestigkeit wurde kein relevanter Festigkeitsabfall ermittelt. Experimental analysis of the durability of external thermal insulation compound systems (ETICS) using wood fibre insulating boards. The insulation of external thermal insulation compound systems has to be protected by the rendering system. The failure of the rendering system, e.g. due to the loss of bonding strength to the insulation can lead to a failure of the hole system. Forecasts of the durability should be done by using test results of tensile bond strength from samples which were stressed by artificial weathering. Boards with a relatively high strength lose nearly 25 % of their strength and continue in a while at that level. Boards with a relatively low strength do not lose there strength any more. [source]

Seven-year dentin bond strengths of a total- and self-etch system

EUROPEAN JOURNAL OF ORAL SCIENCES, Issue 3 2005
Michael F. Burrow
The aim of this study was to determine the durability of tensile bond strengths of a conventional 3-step bonding system (Superbond D-liner Plus) and a self-etching priming bonding system (Clearfil Liner Bond II) to bovine dentin over a 7 yr period. Superficial bovine dentin finished with 600-grit SiC paper was bonded with one of the two adhesive materials. A 4 mm diameter area was bonded, covered with resin composite and stored in 37°C deionized water containing gypsum chips and 0.4% sodium azide as an antibacterial. Bonds were stressed in tension at a crosshead speed of 1 mm min,1. Mean bond strengths were observed at 1 d, at 1, 3, and 6 months, and at 1, 2, 3, 6 and 7 yr. Ten specimens were tested for the first 3 yr and 15 specimens were tested for 6 and 7 yr. The bond strength of Superbond D-liner Plus significantly decreased over the 7 yr period, whereas Liner Bond II showed a slight but, insignificant, decrease. The fracture mode changed with time for Superbond D-liner Plus, but not for Liner Bond II. It was concluded that systems which use a strong acid for demineralizing the dentin may show greater deterioration of the bond to dentin compared with a self-etching priming system. [source]