Influence of thermal stress on marginal integrity of restorative materials
DOI:
https://doi.org/10.1590/S1678-77572008000200005Keywords:
Thermal cycling, Microleakage, Composite resins, Glass ionomer cements, Amalgam, Dental materials, propertiesAbstract
The aim of this study was to evaluate the influence of thermal stress on the marginal integrity of restorative materials with different adhesive and thermal properties. Three hundred and sixty Class V cavities were prepared in buccal and lingual surfaces of 180 bovine incisors. Cervical and incisal walls were located in dentin and enamel, respectively. Specimens were restored with resin composite (RC); glass ionomer (GI) or amalgam (AM), and randomly assigned to 18 groups (n=20) according to the material, number of cycles (500 or 1,000 cycles) and dwell time (30 s or 60 s). Dry and wet specimens served as controls Specimens were immersed in 1% basic fuchsine solution (24 h), sectioned, and microleakage was evaluated under x40 magnification. Data were analyzed by Kruskal-Wallis and Mann-Whitney tests: Thermal cycling regimens increased leakage in all AM restorations (p<0.05) and its effect on RC and GI restorations was only significant when a 60-s dwell time was used (p<0.05). Marginal integrity was more affected in AM restorations under thermal cycling stress, whereas RC and GI ionomer restoration margins were only significantly affected only under longer dwell times.Downloads
Download data is not yet available.
Downloads
Published
2008-04-01
Issue
Section
Original Articles
License
Todo o conteúdo do periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons do tipo atribuição CC-BY.
How to Cite
Influence of thermal stress on marginal integrity of restorative materials . (2008). Journal of Applied Oral Science, 16(2), 106-110. https://doi.org/10.1590/S1678-77572008000200005