Why is Calcium Hydroxide no longer recommended as a liner under the entire restorative material?

Calcium Hydroxide is no longer recommended as a liner under the entire restorative material primarily due to its poor compressive strength. While Calcium Hydroxide has beneficial properties, such as promoting healing and being mildly antibacterial, its inadequate compressive strength limits its effectiveness as a base for restorative materials that require stability and strength under occlusal forces.

When used as an entire liner, the restorative material above may not perform satisfactorily under functional loading, potentially leading to fractures or failure of the restoration over time. This factor makes it inappropriate for use in situations where a stronger support is needed. Dentists and dental assistants have increasingly moved toward materials that are stronger and provide better mechanical properties, thereby ensuring a more durable restoration.

Other considerations related to the options help further understand the context. For instance, while cost and adhesion properties are important factors in material selection, they do not primarily drive the decision against using Calcium Hydroxide in this specific context. Moreover, the reactivity with dental materials is not a predominant issue associated with Calcium Hydroxide, which allows it to still be utilized effectively in certain applications, albeit not as an overarching liner.