Tooth degradation, progressing from initial caries to deep cavities, underscores the importance of high-quality restorations. The durability and success of dental restorations depend significantly on their mechanical properties, including bond strength and material resilience. By leveraging biomimetic principles, clinicians and engineers aim to replicate the natural design of teeth, emphasizing precise material selection and robust bonding between tissues and artificial materials.
A recent study sought to evaluate and compare five bulk filling restoration techniques for Class I cavities with a high C-factor (5.0). Researchers analyzed tensile bond strength between dentin and fillings, as well as the internal structure of the restorations, using computed tomography, scanning electron microscopy, and mechanical testing.
The findings revealed that the semi-direct bulk filling technique, which includes an additional indirect curing step, significantly outperformed direct bulk filling. On average, the semi-direct technique achieved a tensile bond strength of 51.1 ± 12.2 MPa—an improvement of 58% over the direct method, which recorded a strength of 32.4 ± 8.2 MPa using the same materials.
This enhanced bond strength makes the semi-direct bulk filling technique a promising solution for Class I cavities. It enables durable and reproducible restorations by achieving stronger adhesion and improved structural integrity. The study highlights the potential of this method to improve patient outcomes by combining innovation with biomimetic science in dentistry.