Abstract
The purpose of this article was to compare the mean value of optical density of four porcelains commonly used for fabrication of inlay/onlay prostheses using direct digital radiograph. The sample consisted of 20 2-mm thick porcelain specimens (measured by digital pachymeter): Empress (Ivoclair), Simbios (Degussa), Vita Omega 900 and Vitadur Alpha (Vita Zahnfabrik). The values of optical density of the specimens were expressed in millimeters aluminum equivalent (mm eq Al). The samples were X-rayed using two charge coupled devices (CCD) - RVG (Trophy) - Visualix (Gendex) and a phosphor plate system – Digora (Soredex). The optical density reading was performed with Image Tool 1.28 in a total of 110 measurements. Statistical analysis showed that there were statistically significant differences in all materials studied (p < 0.05) regardless of the radiographic system used. The highest optical density value was found for Omega 900 (1.8988 mmeqAl – Visualix – Gendex) and the lowest for Vitadur Alpha (0.8647 – Visualix – Gendex). Thus, the material presenting the highest degree of optical density was Omega 900, Empress and Simbios presented intermediate optical density values, Vitadur Alpha presented the lowest value, and the optical density of porcelains was not influenced by the digital radiography systems.
Highlights
Since long ago, man has searched for restoration of esthetics and masticatory function in order to meet these requirements satisfactorily
The present paper studied porcelains commonly used for inlay/onlay and verified the degree of optical density by means of digital radiography
4 commonly used porcelain brands were used for fabrication of inlay/onlay prostheses: Empress (Ivoclar, Liechtenstein, Germany), Simbios (Degussa, Hanau, Germany), Vita Omega 900 and Vitadur Alpha (Vita Zahnfabrik, Säckingen, Germany)
Summary
Man has searched for restoration of esthetics and masticatory function in order to meet these requirements satisfactorily. Porcelain has recently been introduced in dentistry, and its use as a restorative material began about 200 years ago, but it was in the 80s that a big push was given, with the appearance of the new generation of porcelains, composites and dental adhesives that contributed for the development of indirect techniques for application in posterior teeth such as inlay/onlay[24]. According to Curtis, et al.[9], the manufacturers can control the optical density of materials through selection of the polymeric matrix, the nature of elements, their different sizes and densities may remarkably influence this condition . 8,9,22
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