Evaluation of Marginal Gap at the Composite / Enamel Interface in Class II Composite Resin Restoration by SEM after Thermal and Mechanical Load Cycling : An in Vitro Comparative Study

2014 ◽  
Vol 26 (4) ◽  
pp. 63-70 ◽  
Author(s):  
Mais Yaroub ◽  
Mohammed R. Hameed
Keyword(s):  
Comparative Study ◽  
Composite Resin ◽  
Mechanical Load ◽  
Class Ii ◽  
Marginal Gap ◽  
Load Cycling ◽  
Composite Resin Restoration

scholarly journals Effect of Mechanical Load Cycling on Microleakage of Restorative Glass Ionomers Compared to Flowable Composite Resin in Class V Cavities

2019 ◽  
Author(s):  
Zahra Hasani ◽  
Effat Khodadadi ◽  
Fariba Ezoji ◽  
Soraya Khafri
Keyword(s):  
Composite Resin ◽  
Mechanical Load ◽  
Glass Ionomer Cement ◽  
Wilcoxon Test ◽  
Class V ◽  
Flowable Composite ◽  
Load Cycling ◽  
Ionomer Cement ◽  
Better Than

Objectives: Microleakage is the most important factor responsible for the destruction of restoration margins. The aim of this study was to assess the effect of mechanical load cycling on microleakage of four types of glass ionomer cement (GIC) in comparison with a flowable composite resin. Materials and Methods: In this in-vitro experimental study, 100 Class V cavities were prepared on the buccal and lingual surfaces of 50 intact premolars. The prepared cavities were divided into five groups of (A) Z350, (B) Equia Forte, (C) encapsulated Fuji II LC, (D) hand-mixed Fuji II LC, and (E) Ketac Molar. All the samples were thermocycled (×2,000, 5-55°C), and half of the samples in each group were load cycled. All the teeth were then immersed in 0.5% basic fuchsine for 24 hours, sectioned, and observed under a stereomicroscope. Data were analyzed with Kruskal-Wallis and Mann-Whitney-U tests. Comparison between the incisal and gingival microleakage was made with Wilcoxon test. P<0.05 was considered statistically significant. Results: Load cycling and type of restorative material had a significant effect on microleakage. Gingival microleakage was significantly higher than occlusal microleakage with Equia Forte, encapsulated Fuji II LC, hand-mixed Fuji II LC, and Ketac Molar in the absence of loading, and with Z350 after loading. Conclusion: The sealing ability of Z350 under load cycling was better than that of Equia Forte, hand-mixed Fuji II LC, and Ketac Molar. The marginal integrity of encapsulated Fuji II LC was not significantly different than that of Z350.

scholarly journals Effect of Thermo-mechanical Load Cycling on Microleakage in Class II Ormocer Restorations

2009 ◽  
Vol 03 (03) ◽  
pp. 200-206 ◽  
Author(s):  
Dina Erdilek ◽  
Can Dörter ◽  
Fatma Koray ◽  
Karl-Heinz Kunzelmann ◽  
Begum Guray Efes ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Mechanical Load ◽  
In Vitro Study ◽  
Clinical Problem ◽  
Class Ii ◽  
Dye Penetration ◽  
Load Cycling ◽  
In Vitro Assessment ◽  
Distal Direction

ABSTRACTObjectives: The objective of this in vitro study was to evaluate the marginal sealing ability of an ormocer in comparison with a hybrid composite when using thermocycling and load cycling procedures together in the study design.Methods: Modified proximal Class II cavities were prepared on the mesial and distal surfaces of twenty-two human premolars. Each tooth was restored with Admira and contralaterally with TPH Spectrum. Half of all of the teeth were subjected to thermo-mechanical load cycling. After dye penetration, longitudinal sections in mesio-distal direction were prepared and examined under a stereomicroscope. Data were analyzed with Mann Whitney U test.Results: The results showed that the thermo-mechanical load cycling caused a statistically significant increase in gingival microleakage when compared with the non-thermocycled and nonloaded restorations for both the materials Admira (P=0.006) and TPH Spectrum (P=0.023).Conclusions: Simultaneous load cycling and thermocycling are decisive factors in the in vitro assessment of gingival microleakage, which still remains to be a clinical problem even with the ormocer system Admira. (Eur J Dent 2009;3:200-206)

scholarly journals Polymerization Shrinkage of Different Types of Composite Resins and Microleakage With and Without Liner in Class II Cavities

2014 ◽  
Vol 39 (3) ◽  
pp. 325-331 ◽  
Author(s):  
E Karaman ◽  
G Ozgunaltay
Keyword(s):  
Composite Resin ◽  
Glass Ionomer Cement ◽  
Class Ii ◽  
Composite Resins ◽  
Imaging Device ◽  
Polymerization Shrinkage ◽  
Resin Modified Glass Ionomer ◽  
Different Types ◽  
Composite Resin Restorations

SUMMARY Aim To determine the volumetric polymerization shrinkage of four different types of composite resin and to evaluate microleakage of these materials in class II (MOD) cavities with and without a resin-modified glass ionomer cement (RMGIC) liner, in vitro. Materials and Methods One hundred twenty-eight extracted human upper premolar teeth were used. After the teeth were divided into eight groups (n=16), standardized MOD cavities were prepared. Then the teeth were restored with different resin composites (Filtek Supreme XT, Filtek P 60, Filtek Silorane, Filtek Z 250) with and without a RMGIC liner (Vitrebond). The restorations were finished and polished after 24 hours. Following thermocycling, the teeth were immersed in 0.5% basic fuchsin for 24 hours, then midsagitally sectioned in a mesiodistal plane and examined for microleakage using a stereomicroscope. The volumetric polymerization shrinkage of materials was measured using a video imaging device (Acuvol, Bisco, Inc). Data were statistically analyzed with Kruskal-Wallis and Mann-Whitney U-tests. Results All teeth showed microleakage, but placement of RMGIC liner reduced microleakage. No statistically significant differences were found in microleakage between the teeth restored without RMGIC liner (p&gt;0.05). Filtek Silorane showed significantly less volumetric polymerization shrinkage than the methacrylate-based composite resins (p&lt;0.05). Conclusion The use of RMGIC liner with both silorane- and methacrylate-based composite resin restorations resulted in reduced microleakage. The volumetric polymerization shrinkage was least with the silorane-based composite.

Marginal Gap Formation in Approximal “Bulk Fill” Resin Composite Restorations After Artificial Ageing

2018 ◽  
Vol 43 (2) ◽  
pp. 180-189 ◽  
Author(s):  
A Peutzfeldt ◽  
S Mühlebach ◽  
A Lussi ◽  
S Flury
Keyword(s):  
Tap Water ◽  
Resin Composite ◽  
Class Ii ◽  
Artificial Ageing ◽  
Resin Composites ◽  
Gap Formation ◽  
Marginal Gap ◽  
Significance Level ◽  
Significant Difference

SUMMARY The aim of this in vitro study was to investigate the marginal gap formation of a packable “regular” resin composite (Filtek Supreme XTE [3M ESPE]) and two flowable “bulk fill” resin composites (Filtek Bulk Fill [3M ESPE] and SDR [DENTSPLY DeTrey]) along the approximal margins of Class II restorations. In each of 39 extracted human molars (n=13 per resin composite), mesial and distal Class II cavities were prepared, placing the gingival margins below the cemento-enamel junction. The cavities were restored with the adhesive system OptiBond FL (Kerr) and one of the three resin composites. After restoration, each molar was cut in half in the oro-vestibular direction between the two restorations, resulting in two specimens per molar. Polyvinylsiloxane impressions were taken and “baseline” replicas were produced. The specimens were then divided into two groups: At the beginning of each month over the course of six months' tap water storage (37°C), one specimen per molar was subjected to mechanical toothbrushing, whereas the other was subjected to thermocycling. After artificial ageing, “final” replicas were produced. Baseline and final replicas were examined under the scanning electron microscope (SEM), and the SEM micrographs were used to determine the percentage of marginal gap formation in enamel or dentin. Paramarginal gaps were registered. The percentages of marginal gap formation were statistically analyzed with a nonparametric analysis of variance followed by Wilcoxon-Mann-Whitney tests and Wilcoxon signed rank tests, and all p-values were corrected with the Bonferroni-Holm adjustment for multiple testing (significance level: α=0.05). Paramarginal gaps were analyzed descriptively. In enamel, significantly lower marginal gap formation was found for Filtek Supreme XTE compared to Filtek Bulk Fill (p=0.0052) and SDR (p=0.0289), with no significant difference between Filtek Bulk Fill and SDR (p=0.4072). In dentin, significantly lower marginal gap formation was found for SDR compared to Filtek Supreme XTE (p&lt;0.0001) and Filtek Bulk Fill (p=0.0015), with no significant difference between Filtek Supreme XTE and Filtek Bulk Fill (p=0.4919). Marginal gap formation in dentin was significantly lower than in enamel (p&lt;0.0001). The percentage of restorations with paramarginal gaps varied between 0% and 85%, and for all three resin composites the percentages were markedly higher after artificial ageing. The results from this study suggest that in terms of marginal gap formation in enamel, packable resin composites may be superior to flowable “bulk fill” resin composites, while in dentin some flowable “bulk fill” resin composites may be superior to packable ones.

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