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Analysis of Intensity in Different Light Cure Units Used in Dentistry

Author: Jameel MA Sulaiman
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 19 Pages: 192-197
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aim of this study was the analysis of intensity in different light cure units used in dentistry. Materials and Methods: Four types of light curing sources units; ULTRA–LITE (LED) Astralis 5 (Halogen), BlueLuxcer.TM (Halogen), Delma (LED), were evaluated for the analysis. Light intensity was recorded at various distances of 0 –16 mm, between the light curing tip and a curing radiometer, and at different times (10, 20, 30 seconds) in low–power and at 5, 10, 20 seconds in high–power. Re-sults: The highest light intensity for the first three types (562 mW/cm2) was obtained by BlueLuxcer.TM – high power when the tip of light curing unit was in contact with a curing radiometer. The light inten-sity for the three types of LCUs decreased significantly (p< 0.05) when the light tip was placed at an angle 700 and distance 0, 2, 4, 6, 8, 10, 12, 14, 16 mm away from the a curing radiometer, and the low-est intensity (38 mW/cm2) was obtained by ULTRA–LITE–LED. But the maximum light intensity for the light cure type Delma–LED, was 772 mW/cm2 and the minimum was 268 mW/cm2 when the light tip was placed perpendicular 900 and distance 0, 2, 4, 6, 8, 10, 12, 14, 16 mm away from the a curing radiometer. Furthermore, no significant differences (p>0.05) were detected between Intensity and vary-ing time at 5, 10, 20, 30 sec. Conclusions: The intensity of the curing light was strongly affected by the angles and distance. The decrease in light intensity was significant (p< 0.05) when the light tip placed at an angle 70° and a way to the aperture of the a curing radiometer, but the magnitude of the intensity it becomes more with the same procedure when the angle was perpendicular 900. The decrease in the light intensity of the light curing units, agree with the inverse square law for the distances 0 to 16 mm. The study found that there was no significant difference (p> 0.05) in light intensity between the light curing tip and a curing radiometer varying with time. This study notice that the intensity of the light cure type LED is less than QTH(Quartz Tungsten Halogen).

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Article
Comparison Study for the Quantity of Titanium Exist in Different Type of Dental Implant Alloy

Author: Jameel MA Sulaiman
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 27 Pages: 560-565
Publisher: Mosul University جامعة الموصل

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Abstract

The current study aims to compare alloys of dental implants and to find the ratio of titanium element (Ti) with different origins which are used by dentists in dental implant to restore the missing teeth. Materials and Methods: Three types of dental implants from Germany, Italy and Korea used in this study for statement the chemical structure of these alloys using (XRD: X-Ray Diffraction) (Model S1TurboSD LECE, BRUKER). Hardness, tensile strength, and flexibility coefficient tested by hardness measuring device Micro Hardness – AMSLER, Germany, 1978. The microstructure of samples obtained by Metrology Microscope (600X), ME-3125, UNION, 1978, Japan. Results: Different elements appeared in each alloy, and the titanium (Ti) ratio was the main one, where the Germany type (95.14%), Italy, (91.21%), while Korea type was the highest (95.21%). Tension Resistance in Germany model (755) N/(mm)2, Italian (781) N/(mm)2, and Germany (785) N/(mm)2. Hardness Vickers (HV) in Germany (277), Italy (285) and for Korean type (287). Modulus of elasticity, in Germany (107) Gpa, in Italy (115) Gpa. and in Korean (107) Gpa. The classification according to the American Society for Testing and Materials found in Germany Ti 3-2.5, Italy Ti6-2-1-1, and in Korean Ti 3-2.5. Conclusions: The Korean sample is best for three reasons the quantity of Titanium, Hardness Vickers (VH) and Tension Resistance are more. The Italy type is found better for Modulus Elasticity, while the Germany type is better in Microstructure. In general, and since, the three types have more than (90%) of Titanium there for all the types of dental implant are good against corrosion from acid and Hydrofluoric (HF).

Keywords

Dental Implant --- Titanium --- Alloy

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