To prevent post-operative sensitivity in Class II preparations, which material should be applied as the first increment?

In Class II preparations, applying flowable material as the first increment can significantly help in preventing post-operative sensitivity. Flowable composites are designed to be more adaptable to the nuances of the cavity preparation, allowing them to fill in microscopic voids and imperfections that may exist between the tooth structure and the restorative material, leading to a better seal. This improved adaption not only enhances the bond but also reduces the risk of microleakage, which is often a primary cause of sensitivity following dental restorations.

Additionally, flowable composites tend to have lower viscosity, which allows them to flow into areas that might be challenging for more viscous materials. This property helps in creating a more uniform layer and ensures that potential gaps are minimized. Consequently, when it comes to maintaining patient comfort and preventing discomfort post-operatively, using flowable materials first in Class II restorations is a sound clinical approach.

Other materials, while useful in their own contexts, do not provide the same level of adaptability and seal against microleakage when used as the first increment in such preparations.