Results with Glass Hybrids in the posterior
Glass Ionomers have become considered as a permanent material for the restoration of posterior teeth. The objective of this presentation is to discuss the long-term clinical performance of GIs in comparison to widely used composite resins in posterior teeth with the current published data.
Glass ionomers (GIs) have been recommended to be used as restorative cements, cavity liners/bases, and luting cements since their introduction in dentistry in the early 1970s. They have certain unique properties that make them favorable. This includes chemical bonding to enamel and dentin, thermal expansion similar to that of tooth structure, biocompatibility, uptake and release of fluoride, and decreased moisture sensitivity. The main disadvantages of GIs include their susceptibility to water uptake and loss, particularly in the initial setting reaction, as well as their brittle material character. These drawbacks have supposedly been ameliorated in modern, recently launched high-viscosity GIs. During the past years, they have undergone major changes. Advancements in their formulations led to better properties, such as improvement in handling characteristics, wear resistance and strength and decreased setting time, which have widened the indication spectrum of GIs. They have certainly progressed remarkably from their inception to their present-day use as the permanent restorative material choice for a variety of clinical situations.
As there is a universal decrease trend in the mostly used posterior restorative material-amalgam-usage all over the world, the long term clinical success of the materials replacing amalgam certainly requires to be evaluated. For this reason, long term clinical trials are needed and the ultimate and most reliable methods to evaluate the longevity of restorations are randomized, controlled clinical trials. Despite the expanding use of GIs as permanent restorative material for posterior restorations, until now there have been very few clinical trials on their performances. As it is reasonable to expect adequate evidence of biological safety, clinical efficacy and longevity; in this presentation, long term durability of GIs in the restoration of Class I and Class II cavities and as well as non caries cervical lesions comparing with composite resins which are routinely preferred will be discussed with the latest published data.
The audience will be able to:
- Understand clinical behavior of restorative GIs
- Apply scientific information from the literature for clinical decisions about the use of restorative GIs
- Appropriately use GIs in restorative dentistry