Influence of Elasticity on Gap Formation in a Lining Technique with Flowable Composite

Abstract

The purpose of this study was to investigate the effect of flowable composites as liners for direct composite restorations, with key focus on the elastic moduli of flowable and condensable composites. After treating the composite mold cavity surface with an adhesive system, one of the flowable composites was placed as a 1 mm-thick layer on the cavity floor and irradiated for 20 seconds. The rest of cavity was subsequently filled with a condensable composite and irradiated for 40 seconds. Gap formation at both interfaces -between the cavity floor and flowable composite, and between the flowable and condensable composites -was examined. No gaps were detected at the interface between the cavity floor and flowable composite. Gap percentage at the interface between the flowable and condensable composites was dependent on the difference in elastic modulus. It was concluded that flowable composite with high elastic modulus could inhibit gap formation between flowable and condensable composites.

Influence of abrasive particle size on surface properties of flowable composites

“…Table 3 Statistical analysis results ratio of fillers as conventional composites, hence exhibiting much improved mechanical properties 1,21) . They can be used not only as lining 2,22) or repair materials, but also as a filling material. Since flowable composites can be applied to a variety of cavities, esthetic properties are hence expected of them.…”

Cuspal deflection, strain and microleakage of endodontically treated premolar teeth restored with direct resin composites

“…16,18,24 Furthermore flowable composites and resin modified glass ionomer cements have been recommended as liners under resin composites to reduce potential microleakage, gap formation and recurrent caries. 14,[25][26][27] In this study we have investigated the extent to which endodontic access influences cuspal deformation and strain during direct restoration with a low shrink resin composite. Endodontic access was either confined within the occlusal floor of an MOD cavity or (as is common clinically) with the axial walls of dentine removed.…”

Fracture strength and fracture patterns of root filled teeth restored with direct resin restorations

“…Attempts at minimizing this problem have included the use of low shrink composites, 10 incremental placement 11 and the use of liners including glass ionomer, flowable composites and polyacid-modified resin composites. [12][13][14] The performance of direct resin composites for the restoration of root filled teeth has been investigated experimentally ever since posterior resin composite materials were first introduced [15][16][17] and clinically in both retrospective and prospective clinical studies. Despite the less favourable outcomes in comparison with cuspal coverage restorations reported in retrospective studies, 3,4 two randomised clinical trials found superior performance compared to amalgam restorations in terms of fracture resistance, but with a problem of recurrent caries.…”