Impact of refrigeration on the surface hardness of hybrid and microfilled composite resins
| Autor: | Fernando Henrique Ruppel Osternack, Sérgio Vieira, Rodrigo Nunes Rached, Danilo Biazzetto de Menezes Caldas, Janaina Bertoncelo de Almeida, Jeffrey A. Platt |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
resin composite
Materials science Resin composite Composite number Refrigeration medicine.disease_cause Hardness Composite Resins Knoop hardness Polymerization refrigeration Mold Materials Testing Knoop hardness test medicine In vitro study Composite material General Dentistry Light-Curing of Dental Adhesives |
| Zdroj: | Brazilian Dental Journal, Volume: 20, Issue: 1, Pages: 42-47, Published: 2009 Brazilian Dental Journal v.20 n.1 2009 Brazilian Dental Journal Fundação Odontológica de Ribeirão Preto (FUNORP) instacron:FUNORP |
| Popis: | This in vitro study evaluated the Knoop hardness of the composite resins Charisma® (C) and Durafill VS® (D) polymerized in 3 different conditions: at room temperature (A) (23 ± 1°C); refrigerated at 4 ± 1°C and immediately photo-activated after removal from the refrigerator (0); and, refrigerated at 4 ± 1°C and photo-activated after a bench time of 15 min at room temperature (15). One hundred and twenty specimens (4 mm diameter and 2 mm depth) were made using a stainless steel mold and following manufacturer's instructions. All specimens were tested immediately after polymerization (I) and after 7 days of water storage in the dark at room temperature (7d). The data were subjected to ANOVA and post-hoc Tukey's test (a=0.05). On the top surface, CAI was statistically similar to C15I and DAI to D15I (p>0.05). On the bottom surface, CAI presented higher hardness values when compared to COI and C15I (p0.05) on the bottom surfaces for any tested polymerization condition. After 7 days of storage, the Knoop hardness decreased significantly (p0.05). D07d showed higher Knoop hardness (p |
| Databáze: | OpenAIRE |
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