When comparing the strength of a base to that of a liner in dental materials, the base is considered stronger. Bases are designed to provide support for restorations and can withstand greater forces than liners, which serve primarily to protect the pulp from thermal shock and chemical irritation. Bases typically have greater thickness and added properties that allow them to bear occlusal loads and resist wear over time.
Liners, on the other hand, are usually applied in thin layers and are more focused on providing a barrier and alleviating pulpal sensitivity rather than structural support. They often have less compressive strength and are not intended for load-bearing applications within the tooth structure. Therefore, the fundamental purpose of a base being to provide strength and stability to the restoration underscores why it is stronger than a liner.
While certain materials could influence the performance of either a base or a liner, the general understanding in dentistry is that bases are inherently stronger than liners by design and intended use.