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Title: Influence of thermal stress on marginal integrity of restorative materials
Authors: Cenci, Maximiliano Sérgio
Cenci, Tatiana Pereira
Donassollo, Tiago Aurélio
Sommer, Leandro
Strapasson, André
Demarco, Flávio Fernando
Abstract: 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.
Keywords: Thermal cycling
Composite resins
Glass ionomer cements
Dental materials
Publisher: University of São Paulo
Citation: CENCI MS ; PEREIRA-CENCI, Tatiana ; DONASSOLLO, Tiago Aurélio ; SOMMER, Leandro ; STRAPASSON, André ; DEMARCO, Flávio Fernando . Influence of thermal stress on marginal integrity of restorative materials. Journal of Applied Oral Science, v. 16, p. 106-110, 2008.
Issue Date: 2008
Appears in Collections:Departamento de Odontologia Restauradora: Artigos de periódicos

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