Evaluation of the Effect of Water on Three Different Light Cured Composite Restorative Materials Stored in Water: An In Vitro Study

Abstract

<jats:p><jats:italic>Objectives</jats:italic>. The objective of this in vitro study was to investigate whether weight gain or loss in the three different composites occurs due to water absorption when they are stored in water.<jats:italic>Methods</jats:italic>. The composite restorative materials selected for this study included a microfine hybrid (Synergy) and two nanofilled composite restorative materials (Ceram X and Filtek Supreme Ultra). Twenty specimens of each material were fabricated of each composite material. Group A: Filtek Supreme Ultra, Group B: Synergy, Group C: Ceram X. Then all the specimens were stored in 10 ml Distilled water containing test tubes and placed in incubator at 37<jats:sup>°</jats:sup>C for six weeks. The weight changes of these specimens were measured daily for the first week and later once a week for next five weeks by using an electrical analytical balance.<jats:italic>Results.</jats:italic>The data was analyzed by one-way analysis of variance and Student's<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>t</mml:mi></mml:math>test. All groups showed maximum amount of water absorption in the first week than gradual decrease in the water absorption from the second to the sixth week, as compared to the first week and there is no statistically significant difference between the groups tested.<jats:italic>Conclusion</jats:italic>. All the composite restorative material absorbs some amount of water. The water absorption of the composite may decrease the physical and mechanical properties of the composites; hence it is necessary to consider the type of the material before starting the treatment.</jats:p>

Effect of Grape Derived Beverages in Colour Stability of Composite Resin Submitted to Different Finishing and Polishing Methods

“…This results meets findings in the literature, as there are reports that surface treatment is connected with restorations quality [10], therefore, rough surfaces have a negative effect, facilitating staining [28]. After the immersion periods conducted in this study, it was found that distilled water promoted its greater potential in color change in seven days, this can be explained by the fact that a large part of composite´s water absorption occurs in the first week [29].…”

The effect of instrument lubricant on the diametral tensile strength and water uptake of posterior composite restorative material

“…The mechanism for this is not fully understood, however it may be a result of differing interactions between lubricant components and their environment, over time. The greatest proportion of water uptake occurred in the first week, followed by a gradual decrease between the '1 week' and '12 week' assessments, similar to reported studies on water sorption [19,18,33]. It is clear that the instrument lubricants negatively affected/increased the water uptake of the composite specimens since their mean percentage weight change was significantly higher for the four experimental groups (with lubricant used), compared to the control group.…”

“…Composite materials in the oral cavity undergo interaction with saliva [11][12][13][14][15], however none of the previous studies subjected their composite specimens to an immersion period to simulate such an environment. The inclusion of additional resin matrix from use of a lubricant may increase water uptake and result in increased hydrolytic degradation and have significant deleterious clinical consequences [16][17][18][19].…”

Comparative Evaluation of Solubilities of Two Nanohybrid Composite Resins in Saliva Substitute and Distilled Water: An in vitro Study

“…This results in loss of weight and can be measured as solubility or leaching. 12 A study done by Biradar et al 13 showed the maximum amount of water absorption in the first week, then a gradual decrease in the water absorption from the second to the 6th week, as compared with the 1st week. There was no statistically significant difference among the three tested composite resins.…”