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The effect of in office bleaching on surface roughness and micro-hardness of newly developed composite materials : in vitro study
Joint Authors
al-Khafaji, Ali H.
Nazim, Nur S.
Source
Journal of Baghdad College of Dentistry
Issue
Vol. 26, Issue 2 (30 Jun. 2014), pp.24-29, 6 p.
Publisher
University of Baghdad College of Dentistry
Publication Date
2014-06-30
Country of Publication
Iraq
No. of Pages
6
Main Subjects
Topics
Abstract EN
Background : Alterations in the microhardness and roughness are commonly used to analyze the possible negative effects of bleaching products on restorative materials.
This in vitro study evaluated the effect of in-office bleaching (SDI pola office +) on the surface roughness and micro-hardness of four newly developed composite materials (Z350XT–nano-filled, Z250XT-nano-hybrid, Z250-mico-hybrid and Silorane-silorane based).
Materials and methods : Eighty circular samples with A3 shading were prepared by using Teflon mold 2mm thickness and 10mm in diameter.
20 samples for each material, 10 samples for base line measurement (surface roughness by using portable profillometer, and micro-hardness by usingDigital Micro Vickers Hardness Tester), and 10 samples for after bleaching measurement.
The appropriate bleaching procedure was performed on the top surface of test groups for 90 minutes total bleaching period.
Then surface roughness and hardness were tested at the end of the duration.
Statistical analysis was carried out using ANOVA, LSD and t-test.
Results : There was a highly significant increase in surface roughness of all tested groups after bleaching.
There is a highly significant increase in micro-hardness for Z250, there is decrease in Micro-hardness for silorane and Z250xt and there is a non-significant increase in micro-hardness of Z350xt.
Conclusion : bleaching has a negative effect on surface roughness of all the tested materials, as surface roughness increased after bleaching.
Micro-hardness is a material dependent, there is different reaction to bleaching depending on the resin, load and size of the fillers used in the materials.
Nano-filled composite is the material that has better performance than the other tested materials, as it is the material that has the least affection by bleaching.
American Psychological Association (APA)
Nazim, Nur S.& al-Khafaji, Ali H.. 2014. The effect of in office bleaching on surface roughness and micro-hardness of newly developed composite materials : in vitro study. Journal of Baghdad College of Dentistry،Vol. 26, no. 2, pp.24-29.
https://search.emarefa.net/detail/BIM-387116
Modern Language Association (MLA)
Nazim, Nur S.& al-Khafaji, Ali H.. The effect of in office bleaching on surface roughness and micro-hardness of newly developed composite materials : in vitro study. Journal of Baghdad College of Dentistry Vol. 26, no. 2 (Jun. 2014), pp.24-29.
https://search.emarefa.net/detail/BIM-387116
American Medical Association (AMA)
Nazim, Nur S.& al-Khafaji, Ali H.. The effect of in office bleaching on surface roughness and micro-hardness of newly developed composite materials : in vitro study. Journal of Baghdad College of Dentistry. 2014. Vol. 26, no. 2, pp.24-29.
https://search.emarefa.net/detail/BIM-387116
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 29
Record ID
BIM-387116