[The bonding strength between plat castable ceramics and mild fusing alloy]

Established methods for bonding ceramics to alloys exist, but gaps remain in optimizing specific agent-surface combinations. Prior research has shown that chemical etching and mechanical abrasion improve adhesion. However, no prior work had resolved which bonding agent performs best under varied surface treatments. This uncertainty drove the need for comparative testing of multiple agents. The study aimed to address this gap by evaluating three bonding agents. It was already known that hydrofluoric acid etching enhances ceramic surfaces. Sandblasting is a common technique for alloy surfaces. Yet, the interaction between these treatments and bonding agents remained unclear. This gap motivated the investigation into how different agents respond to surface modifications.

The aim was to identify the optimal bonding agent and surface treatment combination for PCC and SDA-I alloy. The specific problem was the lack of clarity on which agent provides the strongest bond under various surface conditions. The motivation was to improve the reliability of ceramic-alloy restorations. The study focused on comparing three agents: TF, EM, and Porcelite. It was already known that surface treatments influence bond strength. However, the exact impact of each treatment on each agent had not been tested. The goal was to determine which agent-surface combination yields the highest tensile strength. This would help clinicians choose the most effective bonding protocol.

Three bonding agents were tested: TF, EM, and Porcelite dual cure cement. Surface treatments included hydrofluoric acid etching for PCC and sandblasting for the alloy. Bonded samples were subjected to tensile strength testing. Scanning electron microscopy and X-ray energy spectrum analysis were used to assess bonding behavior. Each agent was paired with different surface treatments. The TF agent was tested with hydrofluoric acid-etched PCC and KH-570-painted alloy. EM was tested with hydrofluoric acid-etched PCC and sandblasted alloy. Porcelite was tested with KH-570-painted PCC and sandblasted alloy. The tensile bond strengths were measured and compared.

The TF agent achieved the highest tensile bond strength of 24.37 MPa. This was observed when PCC was etched with hydrofluoric acid and the alloy was painted with KH-570. The EM agent produced a tensile strength of 15.20 MPa with hydrofluoric acid-etched PCC and sandblasted alloy. Porcelite dual cure cement reached 15.25 MPa with KH-570-painted PCC and sandblasted alloy. Scanning electron microscopy showed superior bonding behavior with TF. X-ray energy spectrum confirmed the TF agent's effectiveness in forming a strong interface. These results suggest that TF is the most effective bonding agent under these conditions. The results also indicate that surface treatments significantly influence bond strength.

The authors propose that TF agent provides the strongest bond when PCC is etched with hydrofluoric acid and the alloy is painted with KH-570. The study suggests that surface treatment methods are critical to achieving high tensile strength. The TF agent outperformed EM and Porcelite in this configuration. The results may guide clinicians in selecting optimal bonding protocols. The study does not claim that TF is universally superior but notes its effectiveness under these specific conditions. No prior work had resolved the comparative performance of these agents. The findings may inform future studies on bonding mechanisms. The authors do not generalize beyond the tested agents and surface treatments.