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Article
Shear bond strength of nickel - chromium alloys with different surface treatments

Authors: Tarik Y KASSAB- BASHI --- Ihsan N BEHNAM
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2001 Volume: 1 Issue: 2 Pages: 153-159
Publisher: Mosul University جامعة الموصل

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Abstract

The main objectives of this study were to determine the effect of different nickel - chromium alloys with different surface treatment bonded to enamel tooth surface on the shear bond strength. Seventy five wax disc-shaped samples were prepared. These discs were divided into three groups, (25) in each. The first group was casted with CB-Bland 72 alloy, the second with CB-soft alloy, and the third group with Kera - N alloy. For surface treatment procedures each group was divided into five subgroups, five samples in each: the first subgroup was sandblasted with (50) μm Al2O3 plus electrolytical etching. The second subgroup only electrolytically etched; the third subgroup sandblasted with (50) μmAl2O3. The fourth subgroup sandblasted with (100) μm Al2O3, and the fifth subgroup received no surface treatment. The metal discs were bonded to the labial surface of upper central and lateral incisors using intermediate resin and adhesive luting cement. The samples were thermocycled between (5-60) C°± (2) C° for (500) cycles at (1) minute dwell time and then stored in distilled water in an incubation at (37) C° for seven days. After that the shear - bond strength were tested.The results showed that the mean shear-bond strength of CB-Bland 72 alloy was found to be greater than that of Kera - N and CB-Soft alloys, and surface treatment with (100) μmAl2O3 procedure exhibit the highest bond strength.


Article
Shear bond strength of fluoride release core materials to dentine

Authors: Munther N KAZANJI --- Ammar KH AL-NOORI
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2001 Volume: 1 Issue: 1 Pages: 50-60
Publisher: Mosul University جامعة الموصل

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Abstract

The aims of this study were to determine the mean shear bond strength of fast setting fluoride releasing core materials (vitremer core build up restorative system,compoglass F resin modified glass ionomer,Tetricceram composite and Definite composite) to dentin and the effect of one hour, 24 hour, and one week storage on mean shear bond strength. One hundred thirty molar teeth Were mounted in a plastic cylinder using self-curing resin, then the teeth were prepared to expose flat superficial dentinal surfaces. Each material was mixed according to the manufacturer ' s instruction ' s. A prefabricated nylon mold was applied to the exposed denton, filled with the core material, then light cured and stored in distilled water at 37°C for one hour, 24 hours and one week.The 24 hours and one week storage groups were thermocycled(5°C to 55°C) for 100 cycles before shearing, The specimen were tested with universal compression machine and the mode of failure was observed. The result showed that Vitrether core build up exhibited the greatest bond strength followed by compoglass F and then Tetrie Composite, Definite showed the lowest for all storage time.The differences among time groups were not statistically significant except for vitremer core build up and compoglass F which showed an improvement after 24 hour storage.The adhesive mode of failure revealed a combination of cohesive adhesive failure and failure for vitremer core build up and compoglass F and adhesive failure for Tetricceram and Definite composite resin

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