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Marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS).

Correa Netto LR, Borges AL, Guimarães HB, Almeida ER, Poskus LT, Silva EM - J Appl Oral Sci (2015)

Bottom Line: For both properties, the composite P25 presented the worst results (4.9% and 3.6 MPa).Linear regression analysis showed a strong positive correlation between %VS and Pss (r=0.97), whereas the correlation between Pss and %MI was found to be moderate (r=0.76).Conclusions The addition of 25 wt.% of POSS in methacrylate organic matrix did not improve the marginal integrity of class I restorations.Filtek P90 showed lower polymerization shrinkage and shrinkage stress when compared to the experimental and commercial methacrylate composite.

View Article: PubMed Central - PubMed

Affiliation: Laboratório Analítico de Biomateriais Restauradores, Faculdade de Odontologia, Universidade Federal Fluminense, Niterói, RJ, Brazil.

ABSTRACT
Marginal integrity is one of the most crucial aspects involved in the clinical longevity of resin composite restorations.Objective To analyze the marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS).Material and Methods A base composite (B) was produced with an organic matrix with UDMA/TEGDMA and 70 wt.% of barium borosilicate glass particles. To produce the model composite, 25 wt.% of UDMA were replaced by POSS (P25). The composites P90 and TPH3 (TP3) were used as positive and negative controls, respectively. Marginal integrity (%MI) was analyzed in bonded class I cavities. The volumetric polymerization shrinkage (%VS) and the polymerization shrinkage stress (Pss - MPa) were also evaluated.Results The values for %MI were as follows: P90 (100%) = TP3 (98.3%) = B (96.9%) > P25 (93.2%), (p<0.05). The %VS ranged from 1.4% (P90) to 4.9% (P25), while Pss ranged from 2.3 MPa (P90) to 3.9 MPa (B). For both properties, the composite P25 presented the worst results (4.9% and 3.6 MPa). Linear regression analysis showed a strong positive correlation between %VS and Pss (r=0.97), whereas the correlation between Pss and %MI was found to be moderate (r=0.76).Conclusions The addition of 25 wt.% of POSS in methacrylate organic matrix did not improve the marginal integrity of class I restorations. Filtek P90 showed lower polymerization shrinkage and shrinkage stress when compared to the experimental and commercial methacrylate composite.

No MeSH data available.


Related in: MedlinePlus

Representative optical microscopy images of cavities restored with the four resin composite: B (AA’); P25 (BB’); TP3 (CC’) and P90 (DD’). RBC = resin-based composite, E = enamel, D = dentin. White arrows show gaps marked with methylene blue at the cavity wall-RBC interfaces. Black rectangles are areas selected for scanning electron microscope analysis
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f02: Representative optical microscopy images of cavities restored with the four resin composite: B (AA’); P25 (BB’); TP3 (CC’) and P90 (DD’). RBC = resin-based composite, E = enamel, D = dentin. White arrows show gaps marked with methylene blue at the cavity wall-RBC interfaces. Black rectangles are areas selected for scanning electron microscope analysis

Mentions: With respect to %MI, the highest values were presented by P90, TP3 and B, without significant differences among them (p>0.05). The lowest %MI was presented by P25, although its value was not statistically different from that of B. Figure 3 shows representative optical microscope images of cavities restored with the four resin composites. Figure 4 shows SEM images of the areas pointed out by the White arrows in Figure 3.


Marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS).

Correa Netto LR, Borges AL, Guimarães HB, Almeida ER, Poskus LT, Silva EM - J Appl Oral Sci (2015)

Representative optical microscopy images of cavities restored with the four resin composite: B (AA’); P25 (BB’); TP3 (CC’) and P90 (DD’). RBC = resin-based composite, E = enamel, D = dentin. White arrows show gaps marked with methylene blue at the cavity wall-RBC interfaces. Black rectangles are areas selected for scanning electron microscope analysis
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4621936&req=5

f02: Representative optical microscopy images of cavities restored with the four resin composite: B (AA’); P25 (BB’); TP3 (CC’) and P90 (DD’). RBC = resin-based composite, E = enamel, D = dentin. White arrows show gaps marked with methylene blue at the cavity wall-RBC interfaces. Black rectangles are areas selected for scanning electron microscope analysis
Mentions: With respect to %MI, the highest values were presented by P90, TP3 and B, without significant differences among them (p>0.05). The lowest %MI was presented by P25, although its value was not statistically different from that of B. Figure 3 shows representative optical microscope images of cavities restored with the four resin composites. Figure 4 shows SEM images of the areas pointed out by the White arrows in Figure 3.

Bottom Line: For both properties, the composite P25 presented the worst results (4.9% and 3.6 MPa).Linear regression analysis showed a strong positive correlation between %VS and Pss (r=0.97), whereas the correlation between Pss and %MI was found to be moderate (r=0.76).Conclusions The addition of 25 wt.% of POSS in methacrylate organic matrix did not improve the marginal integrity of class I restorations.Filtek P90 showed lower polymerization shrinkage and shrinkage stress when compared to the experimental and commercial methacrylate composite.

View Article: PubMed Central - PubMed

Affiliation: Laboratório Analítico de Biomateriais Restauradores, Faculdade de Odontologia, Universidade Federal Fluminense, Niterói, RJ, Brazil.

ABSTRACT
Marginal integrity is one of the most crucial aspects involved in the clinical longevity of resin composite restorations.Objective To analyze the marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS).Material and Methods A base composite (B) was produced with an organic matrix with UDMA/TEGDMA and 70 wt.% of barium borosilicate glass particles. To produce the model composite, 25 wt.% of UDMA were replaced by POSS (P25). The composites P90 and TPH3 (TP3) were used as positive and negative controls, respectively. Marginal integrity (%MI) was analyzed in bonded class I cavities. The volumetric polymerization shrinkage (%VS) and the polymerization shrinkage stress (Pss - MPa) were also evaluated.Results The values for %MI were as follows: P90 (100%) = TP3 (98.3%) = B (96.9%) > P25 (93.2%), (p<0.05). The %VS ranged from 1.4% (P90) to 4.9% (P25), while Pss ranged from 2.3 MPa (P90) to 3.9 MPa (B). For both properties, the composite P25 presented the worst results (4.9% and 3.6 MPa). Linear regression analysis showed a strong positive correlation between %VS and Pss (r=0.97), whereas the correlation between Pss and %MI was found to be moderate (r=0.76).Conclusions The addition of 25 wt.% of POSS in methacrylate organic matrix did not improve the marginal integrity of class I restorations. Filtek P90 showed lower polymerization shrinkage and shrinkage stress when compared to the experimental and commercial methacrylate composite.

No MeSH data available.


Related in: MedlinePlus