Which material provides better retention for post and core restorations?

Metal is recognized for providing better retention in post and core restorations due to several key properties. Firstly, metals have superior mechanical strength and tensile properties, which contribute to their stability when subjected to the forces encountered in the oral environment. This stability is crucial, as post and core restorations must withstand chewing forces and prevent dislodgment.

Additionally, the bonding capability of metals, particularly when treated or sandblasted, allows for excellent adhesion to the cement used for securing the post in the root canal. This enhances the overall retention of the restoration. The compatibility of metal with various dental cements also plays a significant role, as certain cements are formulated specifically to maximize retention with metallic materials.

It's important to note that while composite resin, ceramic, and glass ionomer materials have their unique advantages, they typically don't match the retention capabilities of metal in post and core applications. Composite resin, while versatile, may not provide the structural integrity needed for larger restorations. Ceramics can offer aesthetic benefits but may lack the requisite strength for long-term retention, particularly in posterior applications. Glass ionomer materials, on the other hand, are known for their fluoride-releasing properties and are used in specific situations but don't generally outperform metals regarding retention strength in post and core