| Autor: |
van Vuuren, W. -A.Jansen, Khoo, C. S. T., Ng, B. S. K., Waddell, J. N., Al-Amleh, B. |
| Předmět: |
|
| Zdroj: |
New Zealand Dental Journal; Mar2018, Vol. 114 Issue 1, p13-18, 6p |
| Abstrakt: |
Objective: To evaluate the effect of ultrasonic condensing on the biaxial flexural strength, translucency and density of a nano-leucite porcelain. Methods: ISO standard 6872:2008(E) was followed to fabricate 70 discs with Reflex veneering porcelain (Wieland Dental Technik). Specimens were divided into two groups; ultrasonically condensed (n=30) and non-condensed (n=30). Biaxial flexural strengths tests were performed and Weibull modulus calculated for each group. The remaining discs were divided into two groups (n=5) as above. A spectrophotometer (VITA Zahnfabrik) was used to calculate the transparency parameter for each group. The same 10 specimens were used to calculate their density, using Archimede's principle. Independent-samples t-test was used (SPSS) to compare the results between ultrasonically condensed and non-condensed groups. Results: No significant difference was recorded between the groups in any of the tests (p>0.05) However, ultrasonic condensing showed a higher Weibull modulus in the fractured discs. Conclusion: Ultrasonic condensing veneering porcelain powder before firing may not be necessary to improve mechanical properties, porosity reduction, or translucency parameters compared to non-condensed techniques. Nevertheless, caution is advised when interpreting these results, due to the shape factor in making disc forms when compared to porcelain layering on clinical crown forms. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
