Nanohybrid vs. fine hybrid composite in extended Class II cavities after six years

Introduction: Evaluation of microleakage is important for assessing the success of new restorative materials and methods. The aim of this study was to assess the microleakage of class II restorations with different flowable composites as liners and two different polymerization techniques classic and soft start. Materials and Methods: 40 extracted human premolars teeth with class II cavity preparation medial and distal (80 cavities) were divided into four groups: 1.Vertise Flow (VF)+micro hybrid composite Herculite 2.Surefil SDR Flow (SDRF)+micro-hybrid composite Herculite 3.Tetric Flow (TF)+micro-hybrid composite Herculite 4.control group micro-hybrid composite Herculite. Mesial cavities are polymerized with classic and distal cavity with soft start technique of polymerization. After that, the samples were immersed in 0.5% AgNO3 solution and sectioned into the mesiodistal direction. Using a stereomicroscope (Nikon - Japan), with a magnification of 40x, the gingival microleakage of cavities was examined. Data were analyzed using Fisher's and Student's tests. Results: After using the classical polymerization technique, all three used flowable composites VF+Herculite, SDRF+Herculite, TF+Herculite showed less gingival microleakage than the control group. This difference was statistically significant. After the application of the soft-start technique of polymerization, VF+Herculite and SDRF+Hercules showed a statistically significant reduction in gingival microleakage, while TF+Herculite showed a comparable result with control group, without a statistically significant difference. There was no statistically significant difference between classical and soft start polymerization techniques. Conclusion: Flowable composites in this study have reduced gingival microleakage and can be used as liners in the restoration of II class cavities.

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Clinical evaluation of a hybrid composite and a polyacid-modified composite resin in Class-II restorations in deciduous molars

Clinical Oral Investigations ◽

10.1007/s007840050055 ◽

1998 ◽

Vol 2 (3) ◽

pp. 115-119 ◽

Cited By ~ 5

Author(s):

T. Attin ◽

A. Opatowski ◽

C. Meyer ◽

B. Zingg-Meyer ◽

E. Hellwig

Keyword(s):

Clinical Evaluation ◽

Hybrid Composite ◽

Composite Resin ◽

Class Ii ◽

Deciduous Molars

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

European Journal of Dentistry ◽

10.1055/s-0039-1697432 ◽

2009 ◽

Vol 03 (03) ◽

pp. 200-206 ◽

Cited By ~ 7

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)

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Electron microscopy analysis of degenerating pancreatic ß cells in transgenic mice expressing the MHC Class I antigen Dd

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100160297 ◽

1990 ◽

Vol 48 (3) ◽

pp. 548-549

Author(s):

T. A. Stewart ◽

D. Liggitt ◽

S. Pitts ◽

L. Martin ◽

M. Siegel ◽

...

Keyword(s):

Type I Diabetes ◽

Disease Process ◽

Class Ii ◽

Class I ◽

Type I ◽

Aberrant Expression ◽

Mhc Molecules ◽

Endogenous Insulin ◽

Class Ii Mhc ◽

Ifn Γ

Insulin-dependant (Type I) diabetes mellitus (IDDM) is a metabolic disorder resulting from the lack of endogenous insulin secretion. The disease is thought to result from the autoimmune mediated destruction of the insulin producing ß cells within the islets of Langerhans. The disease process is probably triggered by environmental agents, e.g. virus or chemical toxins on a background of genetic susceptibility associated with particular alleles within the major histocompatiblity complex (MHC). The relation between IDDM and the MHC locus has been reinforced by the demonstration of both class I and class II MHC proteins on the surface of ß cells from newly diagnosed patients as well as mounting evidence that IDDM has an autoimmune pathogenesis. In 1984, a series of observations were used to advance a hypothesis, in which it was suggested that aberrant expression of class II MHC molecules, perhaps induced by gamma-interferon (IFN γ) could present self antigens and initiate an autoimmune disease. We have tested some aspects of this model and demonstrated that expression of IFN γ by pancreatic ß cells can initiate an inflammatory destruction of both the islets and pancreas and does lead to IDDM.

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