Dental composites - The effects of matrix composition, suboptimal light curing and water exposure

Abstract

In Scandinavian countries, resin-based composite materials have been used in restorative dentistry for over 30 years, replacing dental amalgams. Composite materials based on dimethacrylates provide better aesthetics and treatment options. However, according to in-vitro findings, dental composites can be affected by water, potentially reducing the longevity of dental restorations. The proper light-curing of these materials is essential for optimal mechanical and physical properties, and despite manufacturer instructions, the use of inadequate light-curing units has been documented. Therefore, this thesis aimed to examine the effects of suboptimal light-curing and monomer content on the water susceptibility of dental composites. According to the results presented in this thesis, the combination of suboptimal light-curing and water exposure decreased the dental composite's physical and mechanical properties and increased the degradation rate. Furthermore, the degree of conversion, a measure of curing, may not provide sufficient information on the state of dental composite curing. In conclusion, the study adds to the importance of sufficient light-curing of dental composites.