Effects of aging on repair of resin‐modified glass–ionomer cements

Abstract

The effects of aging on the repair bond strengths of resin-modified glass-ionomer cements after different methods of surface conditioning were studied. Surface conditioning methods included the following: maleic acid; maleic acid with resin application; polyacrylic acid; polyacrylic acid with resin application. Shear bond testing between the aged and new material was carried out with an Instron Universal testing machine. Surface conditioning with maleic acid and resin application gave the highest repair bond strengths at 3 and 6 months. There was, however, no statistically significant difference in bond strengths between the different treatment groups after both 3 and 6 months storage. Intergroup comparisons revealed no significant difference in failure modes after both storage periods. For all treatment groups, no significant difference in repair bond strengths was noted between storage after 1 week, 3 and 6 months. There appears to be a general decrease in repair bond strengths for all treatment groups after 3 months storage. The clinical repair of resin-modified glass-ionomer cements after this period of time is therefore not recommended.

In vitro compressive strength and edge stability testing of directly repaired glass-ionomer cements

“…It was also noted that after ageing for 3 months immersion, repaired specimens showed weaker mechanical properties on both CS and ES tests compared to the standard specimens. This is in line with Yap et al [24]. Several factors may account for the relative weakening.…”

“…Historical research has been carried out on repairing failed glass-ionomer cement restorations using a conventional cylindrical in-vitro model [18,20,24]. Seldom have investigations been accomplished on conventional GIC rather than RMGIC.…”

Impact of Polishing Systems on the Surface Roughness and Microhardness of Nanocomposites

“…[1][2][3] It may also influence the mechanical properties of the restorations, wear resistance, and the marginal integrity of the restorations. 4,5 Composite resins are widely used for the direct restoration of both anterior and posterior teeth. The surface roughness and microhardness are properties of a composite that are related to the material's resistance to masticatory forces and its appearance which influence the longevity of the restoration.…”

Effect of Different Surface Treatments on Repair Bond Strength of Aged Tooth Colored Materials

“…[24]& [25] little data is available investigating the bond strength associated with the repair of the new restorative materials and the new bonding agents. The present study showed that there is a difference between various methods of surface treatments of tested restorative materials and the repair shear bond strength.…”