What is the purpose of using polyacrylic acid during preparation of a cavity?

Using polyacrylic acid during the preparation of a cavity serves primarily to effectively clean and condition the cavity. This acid works by demineralizing the surface of the dentin, which helps to remove debris and contaminants that may interfere with the adhesion of restorative materials, particularly glass ionomer cements. Conditioning the cavity in this way creates a more conducive environment for the subsequent restorative phases, ensuring better adhesion and a lower risk of failure.

In restorative dentistry, effective cleaning and conditioning can significantly improve the longevity of the restoration by enhancing the bond between the tooth structure and the restorative material. While polyacrylic acid does contribute to achieving some desired properties in restorative materials, its primary role in cavity preparation is rooted in its cleaning and conditioning capabilities. This foundational step is essential for achieving a successful and durable aesthetic outcome in restorative procedures.