The most promising area of research for OCT is the measurement of volumetric polymerization shrinkage in relation to internal adaptation in bulk-fill and conventional composites.

Objectives: The polymerization shrinkage of methacrylate-based composites is among the most important causes of failure of composite restorations. The manufacturers claim that bulk-fill composites have a lower polymerization shrinkage than conventional composites.

2014年4月1日 · To determine the volumetric polymerization shrinkage of four different types of composite resin and to evaluate microleakage of these materials in class II (MOD) cavities with and without a resin-modified glass ionomer cement (RMGIC) liner, in vitro.

Post-operative sensitivity and marginal discoloration frequently occur due to polymerization shrinkage and micro leakage, which is the major cause of failure in resin composite restorations. To evaluate the effects of preheated composite at different temperatures on microleakage.

2013年10月22日 · Aim: To determine the volumetric polymerization shrinkage of four different types of composite resin and to evaluate microleakage of these materials in class II (MOD) cavities with and without...

2024年11月10日 · Replacing metal tanks with composite material tanks can reduce the structural weight by 20 %–40 % and decrease overall costs by at least 25 % [2]. However, the leak behavior of composite pressure vessels has consistently hindered their widespread adoption.

If shrinkage stress exceeds bond strength, a marginal gap forms and leakage occurs at the interface. [1, 2] Microleakage can contribute to marginal discoloration, recurrent caries, and pulpal irritation.

2023年3月27日 · In both 2D and 3D analysis, bulk-fill composite resin preheated to 68 °C and applied at 2 mm thickness showed less microleakage. In the 3D analysis, restorations applied at 37 °C and 4 mm thickness in high-power mode showed significantly higher values (p < 0.001).

2013年9月1日 · This overview of composite resins includes a review of their history and development along with a discussion of strategies for reducing polymerization shrinkage.

2021年11月28日 · The shrinkage of composite resins can be divided into two phases, pre-gel and post-gel, since material shrinkage is the result of both. During the polymerization shrinkage, in the pre-gel phase, the molecules can slide and reach new positions and orientations, neutralizing the polymerization shrinkage stress.