Shear bond strength of chemical and light‐cured glass ionomer cements bonded to resin composites

Abstract

A bond between glass ionomer cements (GIC) and resin composites is desirable for the success of the 'sandwich' restoration . Chemically cured glass ionomer cements have been the traditional materials used in this technique since its development, but etching the GIC was necessary to obtain a bond to the composite facing. Producing a very smooth GIC surface has aided in better determining the magnitude of the chemical bond between glass ionomers and resin composites. Shear testing of bonded specimens has revealed that chemical bonding is minimal (0.21 MPa) in conventional glass ionomers, but does exist (4.92 MPa) between GIC and resin composite regardless of the filler content (microfilled vs hybrid) of the composite . Thermal stressing affects the bond to resin-modified glass ionomers, but has no significant effect on selfcured cements. Of all combinations tested, VitremerlScotchbond/Silux Plus showed the highest mean shear bond strength. Based on the clinical need for an adhesive bond between GIC linerlbase and resin composite , the resin-modified glass ionomer would appear to be the material of choice.

Comparison of Shear Bond Strength of Calcium-enriched Mixture Cement and Mineral Trioxide Aggregate to Composite Resin

“…26 Besides, the higher bond strength of composite resin to RMGI is attributed to the strong chemical bond between RMGI and composite resin. 27,28 Various factors are involved in the chemical bond of RMGI to composite resin, including: (i) unsaturated double bonds in the air-inhibited layer of RMGI, (ii) unpolymerized hydroxyethyl methacrylate (HEMA) on the surface of RMGI, which increases the wettability of the bonding agent, resulting in increased bond strength after polymerization, and (iii) unsaturated suspended methacrylate in the polyacid chain, which can form covalent bonds with composite resin ingredients during RMGI polymerization. 28 The bond strength of pulp capping biomaterials (MTA and CEM) to composite resin depends on their chemical/ physical characteristics.…”

The Influence of Elastic Modulus of Base Material on the Marginal Adaptation of Direct Composite Restoration

“…When composite restorations are lined with RMGICs, there is a loss of retention, because the bond strength between the composite and RMGIC is much lower than what would be between the composite and tooth. 27 Therefore, it is important in RMGIC-lined composite restorations that tooth surfaces other than a GIC-lined surface should provide sufficient adhesive retention for composite restorations. If not, the long- term failure rate would be higher than that of composite restorations without a RMGIC or GIC lining.…”

Study on the interface between light-cured glass ionomer base and indirect composite resin inlay and dentin

“…광중합형 글래스아이오노머는 경화 조절이 용이하고 자가중합형과 유사한 정도의 불소를 방출하며 사용이 편리 하다는 장점을 갖는다. 또한 광조사 후 빠른 중합이 임상적 으로 시간절약과 수분오염에 대한 가능성을 줄여준다 11,12) . 직접 복합 레진 수복 시에는 글래스아이오노머 베이스 후 구강환경에 노출됨 없이 산 부식 (acid etching)과 접착과 정을 통해 수복이 이루어진다.…”