Surface roughness of orthodontic band cements with different compositions
OBJECTIVES: The present study evaluated comparatively the surface roughness of four orthodontic band cements after storage in various solutions. MATERIAL AND METHODS: Eight standardized cylinders were made from 4 materials: zinc phosphate cement (ZP), compomer (C), resin-modified glass ionomer cemen...
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University of São Paulo
2011-06-01
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doaj-18fcff9854724bd29e31349a20faf58d2020-11-25T01:09:45ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652011-06-0119322322710.1590/S1678-77572011000300008Surface roughness of orthodontic band cements with different compositionsFrançoise Hélène van de SandeAdriana Fernandes da SilvaDouver MichelonEvandro PivaMaximiliano Sérgio CenciFlávio Fernando DemarcoOBJECTIVES: The present study evaluated comparatively the surface roughness of four orthodontic band cements after storage in various solutions. MATERIAL AND METHODS: Eight standardized cylinders were made from 4 materials: zinc phosphate cement (ZP), compomer (C), resin-modified glass ionomer cement (RMGIC) and resin cement (RC). Specimens were stored for 24 h in deionized water and immersed in saline (pH 7.0) or 0.1 M lactic acid solution (pH 4.0) for 15 days. Surface roughness readings were taken with a profilometer (Surfcorder SE1200) before and after the storage period. Data were analyzed by two-way ANOVA and Tukey's test (comparison among cements and storage solutions) or paired t-test (comparison before and after the storage period) at 5% significance level. RESULTS: The values for average surface roughness were statistically different (p<0.001) among cements at both baseline and after storage. The roughness values of cements in a decreasing order were ZP>RMGIC>C>R (p<0.001). After 15 days, immersion in lactic acid solution resulted in the highest surface roughness for all cements (p<0.05), except for the RC group (p>0.05). Compared to the current threshold (0.2 µm) related to biofilm accumulation, both RC and C remained below the threshold, even after acidic challenge by immersion in lactic acid solution. CONCLUSIONS: Storage time and immersion in lactic acid solution increased the surface roughness of the majority of the tested cements. RC presented the smoothest surface and it was not influenced by storage conditions.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572011000300008Resin cementsDental materials |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Françoise Hélène van de Sande Adriana Fernandes da Silva Douver Michelon Evandro Piva Maximiliano Sérgio Cenci Flávio Fernando Demarco |
spellingShingle |
Françoise Hélène van de Sande Adriana Fernandes da Silva Douver Michelon Evandro Piva Maximiliano Sérgio Cenci Flávio Fernando Demarco Surface roughness of orthodontic band cements with different compositions Journal of Applied Oral Science Resin cements Dental materials |
author_facet |
Françoise Hélène van de Sande Adriana Fernandes da Silva Douver Michelon Evandro Piva Maximiliano Sérgio Cenci Flávio Fernando Demarco |
author_sort |
Françoise Hélène van de Sande |
title |
Surface roughness of orthodontic band cements with different compositions |
title_short |
Surface roughness of orthodontic band cements with different compositions |
title_full |
Surface roughness of orthodontic band cements with different compositions |
title_fullStr |
Surface roughness of orthodontic band cements with different compositions |
title_full_unstemmed |
Surface roughness of orthodontic band cements with different compositions |
title_sort |
surface roughness of orthodontic band cements with different compositions |
publisher |
University of São Paulo |
series |
Journal of Applied Oral Science |
issn |
1678-7757 1678-7765 |
publishDate |
2011-06-01 |
description |
OBJECTIVES: The present study evaluated comparatively the surface roughness of four orthodontic band cements after storage in various solutions. MATERIAL AND METHODS: Eight standardized cylinders were made from 4 materials: zinc phosphate cement (ZP), compomer (C), resin-modified glass ionomer cement (RMGIC) and resin cement (RC). Specimens were stored for 24 h in deionized water and immersed in saline (pH 7.0) or 0.1 M lactic acid solution (pH 4.0) for 15 days. Surface roughness readings were taken with a profilometer (Surfcorder SE1200) before and after the storage period. Data were analyzed by two-way ANOVA and Tukey's test (comparison among cements and storage solutions) or paired t-test (comparison before and after the storage period) at 5% significance level. RESULTS: The values for average surface roughness were statistically different (p<0.001) among cements at both baseline and after storage. The roughness values of cements in a decreasing order were ZP>RMGIC>C>R (p<0.001). After 15 days, immersion in lactic acid solution resulted in the highest surface roughness for all cements (p<0.05), except for the RC group (p>0.05). Compared to the current threshold (0.2 µm) related to biofilm accumulation, both RC and C remained below the threshold, even after acidic challenge by immersion in lactic acid solution. CONCLUSIONS: Storage time and immersion in lactic acid solution increased the surface roughness of the majority of the tested cements. RC presented the smoothest surface and it was not influenced by storage conditions. |
topic |
Resin cements Dental materials |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572011000300008 |
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