On which walls are bases and liners typically placed?

Bases and liners are typically placed on the axial and pulpal walls of a cavity preparation. The axial walls (the walls that are parallel to the long axis of the tooth) provide a supportive structure, while the pulpal wall is directly related to the pulp chamber of the tooth. When a cavity is prepared, these walls are crucial areas for providing a therapeutic agent that can protect the pulp or provide some form of insulation against thermal shock, chemical irritation, or to aid in the healing process of the deep dentin.

In practice, placing bases and liners on the pulpal and axial walls helps in minimizing the risk of pulp exposure and optimizes the sealing capabilities of the final restoration. This is essential in preserving tooth vitality and providing adequate support for restorative materials, especially in cases that have deep cavities nearing the pulp.

Other options describe placements that are either not standard practice or incomplete. The pulp wall alone does not give enough coverage for the therapeutic materials, while the occlusal walls are more associated with the chewing surface rather than therapeutic interventions for the pulp or supporting structures. The facial and lingual walls may be relevant in terms of cavity preparation but are not typically where bases and liners would be applied. Lastly, stating that they are placed only on axial walls