Sealing ability of occlusal resin composite restoration using four restorative procedures

Abstract

The purpose of this work was to investigate fluid flow after restoration using four restorative procedures. Micro-gap, internal dye leakage, and micropermeability of bonded interfaces were also investigated. Each tooth was mounted, connected to a fluid flow-measuring device, and an occlusal cavity was prepared. Fluid flow after cavity preparation was recorded as the baseline measurement, and the cavity was restored using one of four restorative procedures: bonding with total-etch (Single Bond 2) or self-etch (Clearfil SE Bond) adhesives without lining; or lining with resin-modified glass-ionomer cement (GIC) (Fuji Lining LC) or conventional GIC (Fuji IX) and then bonding with the total-etch adhesive. Fluid flow was recorded after restoration and at specific time-points up to 6 months thereafter and recorded as a percentage. Micro-gap formation was analyzed using resin replicas and scanning electron microscopy. Internal leakage of 2% methylene blue dye was observed under a light microscope. In micro-permeability testing, fluorescent-dye penetration was investigated using confocal laser microscopy. None of the restorative procedures provided a perfectly sealed restoration. Glass-ionomer lining did not reduce fluid flow after restoration, and micro-gaps were frequently detected. The self-etch adhesive failed to provide a better seal than the total-etch adhesive, and even initial gap formation was rarely observed for the former. Penetration of methylene blue and fluorescent dyes was detected in most restorations.

Evaluation of internal adaptation of dental adhesive restorations using micro-CT

“…Many studies reported that adaptations between the tooth and glass ionomer were poor. [14][15][16]22 Composite resin restorations with bases had inferior internal adaptation because of the porosity of light-cured GIC 14 and polymerization shrinkage of the composite resin and light-cured GIC. 15,23,24 The 2D image of group 1 showed many air bubbles (Figures 3a and 3b).…”

“…12 As for the internal adaptation of restorations, Ratih et al reported in their fluid measurement and scanning electron microscopic study that the teeth restored with a high shrinkage composite demonstrated the greatest final volume of outward flow, whereas the group lined with RMGIC showed the lowest final volume and the gap between the dentin and restoration was most intimate. 13 In contrast, in other studies, the internal adaptation of dentin-restoration interfaces was evaluated by fluid flow measurements, 14,15 microgap analysis, 14,16 and internal leakage measurements, 14 and gap formation was observed frequently when RMGIC was used as a base. Swept-source optical coherence tomography (SS-OCT) was applied to detect defects of restoration in cross cut image in real time.…”

Micro-CT evaluation of internal adaptation in resin fillings with different dentin adhesives

“…Other studies have reported that there were no differences in microleakage among dental adhesives if the specimens were dyed and sectioned 40. With tooth sectioning, damage to specimens can affect the resin-dentin interface, which might constitute a limitation of traditional destructive techniques.…”

Novel rechargeable calcium phosphate nanoparticle-containing orthodontic cement

“…56 The exhausted specimens were immersed in this recharge solution with rhodamine B fluorescent dye. After each of the nine recharge treatments, each specimen was cut in the middle to expose its 2 mm × 2 mm cross-section using a diamond saw (Isomet, Buehler, Lake Bluff, IL, USA).…”