Studies on Adhesion of Composite Resins and Glass-Ionomer Cements in Open-Sandwich Technique

Abstract

The aim of this study was to assess the quality of the interface between dental root cement and some restorative materials used in the open sandwich technique. Standardised cavities were prepared on the buccal and oral surfaces of 30 human molars with the gingival margin situated in root cement. The teeth were randomly divided in 3 groups. Different materials combinations were used in buccal and oral cavities. In the control group, the cavities were filled only with composite resins (Filtek Z250-3M ESPE and Zmack Comp-Zermack). In the test groups the cavities were restored using an open sandwich technique as follows: in group 1 Filtek Z250 in combination with Dyract, respectively Ketac Molar Easymix; in group 2 Zmack Comp in combination with Dyract, respectively Ketac Molar. The teeth were stored in 1% methylene blue solution, for 24 hours. The samples were longitudinally sectioned through the centre of restorations and the degree of dye penetration as well as the morphology of the interface between the root cement and the restorative material were evaluated by optical microscopy and SEM. The results showed less microleakage and and adhesive failures in open sandwich restorations with Zmack Comp and Dyract combination.

Study of Marginal Microleakage in Root Caries Restored with Resin Composites, Giomers and Glass Ionomer Cements

“…Other authors reported frequent voids and fractures at the interface with gingival wall as well as cohesive fractures, concluding that all types of failures are present in glass ionomers cements, when using them in opensandwich technique [11].…”

Characterization of Sealing Materials by Energy Dispersive X-ray Spectrometry and Scanning Electron Microscopy

“…An study which compare the the interface between enamel surfaces at the level of pit and fissure and the sealant with different cleaning procedures, with or without acid etching show that Concise White Sealant achieves a better enamel sealing than Dyract Seal when the teeth are treated with air abrasion or air polishing followed by etching [8]. The microhydrid composite resins have a significantly higher hardness than nano-hybrid composites or compomers [9,10] and in another study on top and on bottom surfaces Dyract eXtra showed the lowest hardness values [11]. Beresescu and all considered that particular types of restoring materials should be used in particular situation, depending on the location of the surfaces and the elastic characteristics of the materials and tooth structure [12].…”

Assessment of Near-Infrared (780nm) Light Transillumination Accuracy for Detection of Incipient Caries Lesions

“…ICDAS system was used for the detection of the incipient proximal caries. The definitions of ICDAS scores 02 and 03 for the proximal surfaces are as follows: score 02-distinct visual change in enamel visible when wet; score 03-initial breakdown in enamel due to caries without clinical visual signs of dentinal involvement [13].…”