کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1421960 | 986432 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Setting characteristics and cavity adaptation of low-shrinking resin composites Setting characteristics and cavity adaptation of low-shrinking resin composites](/preview/png/1421960.png)
ObjectivesThe aim of this study was to evaluate the setting characteristics of low-shrinking resin composites and examine the possible interactions with curing efficiency and marginal adaptation in dentin cavities.MethodsThe materials tested were Ceram X Mono/CM, Premise/PR, Clearfil Majesty/CM, ELS/EL, and Filtek Silorane/FS. Polymerization shrinkage strain (%S), strain rate (%Sr) and time at maximum strain rate (tmax) were measured using the bonded disk method. Curing efficiency was measured on the top and bottom surfaces of composites with ATR-FTIR spectroscopy. Marginal adaptation was measured in unbonded (%VVF) and bonded (%XVF) specimens by computerized X-ray microtomography (micro-XCT). The % linear length of the interfacial gaps along the cavity margins (%LD) and the maximum gap width (WDmax) were calculated under optical microscopy on sectioned specimens. Statistical analysis was performed with one- and two-way ANOVA, Bonferroni's post hoc test and Pearson's correlation coefficient.ResultsThe %S values ranged from 1.34% (FS) to 2.29% (CX), while %Sr ranged from 0.06%s−1 (FS) to 0.15%s−1 (CX). %VVF values extended from 1.9% (FS) to 5.3% (CX) and for %XVF from 1.98% (FS) to 3.35% (CX). The values for %LD ranged from 36.52% (FS) to 81.28% (CX). Linear regression showed strong positive correlation for %Sr and tmax with %VVF (r2 = 0.884 and r2 = 0.927) and also for %Sr and tmax with %LD (r2 = 0.823 and r2 = 0.869).Significance%Sr and tmax are more representative than %S in determining the setting pattern of the materials and are strongly correlated to marginal adaptation. The silorane material showed better behavior than the dimethacrylate materials in setting shrinkage and marginal adaptation.
Journal: Dental Materials - Volume 25, Issue 12, December 2009, Pages 1509–1516