Journal of Conservative Dentistry
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ARTICLE
Year : 2006  |  Volume : 9  |  Issue : 2  |  Page : 63-71

Thermal cyclic changes on water sorption and solubility of composite restoratives - An in-vitro study


Department of Conservative Dentistry and Endodontics, College of Dental Sciences, Davangere 577004, India

Correspondence Address:
Aduma Meena Reddy
Department of Conservative Dentistry and Endodontics, College of Dental Sciences, Davangere 577004
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0707.42360

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Background & Objectives : The aim of the study was to evaluate the effect of thermal cycling on water sorption and solubility of three commercially available composites namely Microfilled (Filtek A110), Hybrid (Z- 100) and Packable (Filtek P-60). Methodology: Thirty disc specimens of dimension 10 1 mm diameter and I 0.1 mm thickness were made using each group of composite and randomly divided into three sub groups. All the specimens were subjected to conditioning in a incubator maintained at 35 I C for 24 hours until a constant mass was achieved and the weight checked using an electronic analytical balance (m,). The subgroups were treated as follows ; Subgroup 1 : Stored in distilled water at 178 hours; Subgroup 2 : stored in distilled water at 35C for 173 hours and subjected to five hours of thermal cycling with an upper temperature of 60C. Subgroup 3 : stored in distilled water at 35C for 173 hours and subjected to five hours of thermal cycling with an upper temperature of 60C. Mass after treatment were measured anti recorded as m2 and specimens were re-conditioned to constant mass m3. The volume of the specimens was obtained and water sorption and solubility calculated. Data was analysed using factorial ANOVA/ Mann-Whitney test at significance level of 0.05. Results: Results have shown that highest water sorption was seen for Group B i.e. Z-100 and least for Group C i.e. Filtek P-60. the highest solubility was seen for Group A i.e. Filtek A-1 10 and least for Filtek P-60). Interpretations and Conclusions: Conclusions from the study can he drawn as the effect of thermal cycling on water sorption and solubility of composite resins was material dependent. A significant increase in water sorption was observed for Filtek-A-110 and Z-100 with thermal cycling whereas solubility was not effected with thermal cycling.


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