Studies on the Adhesion of Glass-ionomer Cements to Dentin

Abstract

This study investigated the bonding mechanisms of glass-ionomer cement to dentin. The approaches included mechanical determination of bond strengths, analysis of surface morphology by means of scanning electron microscopy (SEM) and confocal microscopy, and measurement of chemical changes of fracture bond sites by means of x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). The highest bond strengths were obtained with light-cured glass-ionomer cement. SEM and confocal images showed evidence of mechanical interlocking of cement in dentinal tubules. SIMS depth profiles confirmed the ion-exchange process between the light-cured glass-ionomer cement and the dentin surface. From corresponding XPS results, it was clear that the adhesion characteristics were significantly affected by light-curing and the chemical structure of the polymer.

A New Universal Simplified Adhesive: 18-Month Clinical Evaluation

“…For self-etch adhesives, chemical bonding between polycarboxylic monomers (such as VCP) and hydroxyapatite plays a crucial role in their bonding mechanism. 57,58 More than 50% of the carboxyl groups in the polyalkenoic acid copolymer are capable of bonding to hydroxyapatite. 57 Carboxylic groups replace phosphate ions on the substrate and make ionic bonds with calcium.…”

“…57,58 More than 50% of the carboxyl groups in the polyalkenoic acid copolymer are capable of bonding to hydroxyapatite. 57 Carboxylic groups replace phosphate ions on the substrate and make ionic bonds with calcium. Alfa 50 50 50 50 50 50 50 50 48 49 48 46…”

Effect of Substrate Age and Adhesive Composition on Dentin Bonding

“…12,13,16 Carboxylate groups replace phosphate ions of the substrate and bond ionically with calcium of hydroxyapatite. 13 This chemical bonding mechanism is explained by the adhesion-decalcification concept.…”

“…4 Polycarboxylic or polyalkenoic acids promote a stable chemical bonding between the carboxylate groups (COO À ) and calcium in hydroxyapatite. [12][13][14] Glass ionomer cements (GICs) are the only direct restorative material to bond chemically to hard dental tissues as a result of the formation of ionic bonds between carboxylate groups and calcium, enhanced by a shallow interfacial absorption layer into the dentin for the newest resin-modified GIC. 12,14,15 The chemical adhesion provided by GIC has led some manufacturers to introduce carboxylate-based polymers in the composition of dental adhesives.…”

Farklı kaide materyali kullanımının sınıf V restorasyonların mikrosızıntısı üzerine etkisi

“…Rezin modifiye cam iyonomer simanların diş dokularına iyi bağlanma göstermeleri onların avantajları olarak gösterilmektedir. 23 Ancak çalışmamızda bu grupta hem okluzal hem de gingival bölgede 2 örnekte 'Skor 2'nin görülmesi bu materyalin sınıf V kavitelerin yapısal özelliğinden dolayı diş dokularına yeterli bağlanma sağlayamadığı ve hatta bu materyal ile kompozit rezin arasındaki bağlanmanın da araştırılması gerektiğini ortaya çıkarmaktadır.…”