[New procedures for resin-metal bonds. A comparative in-vitro study]

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials

Background:

• Dental restorations increasingly utilize composite resins bonded to various alloys.
• Achieving durable bonds between dental alloys and composite resins is crucial for restoration longevity.
• Silanization techniques have been developed to enhance this interfacial adhesion.

Purpose of the Study:

• To evaluate the bond strength of modern silanization systems to common dental alloys.
• To compare shear strength, fracture topography, and microstructural changes across different systems and alloys.
• To identify the most effective system for bonding composite resins to diverse dental alloys.

Main Methods:

• Tested three silanization systems (Rocatec, Silicoater MD, Spectralink) with specific resins.
• Assessed bond strength using shear tests on nine common dental alloys (seven types).
• Analyzed fracture surfaces and metallographic microstructures.

Main Results:

• No significant microstructural transformations were observed with any tested system.
• The Silicoater MD system exhibited the lowest bond strength, particularly with non-precious alloys.
• The Rocatec system demonstrated superior bond strength to all tested alloys, notably pure titanium.

Conclusions:

• The Rocatec system offers superior adhesion between dental alloys and composite resins compared to tested alternatives.
• Bond strength is influenced by the specific silanization system and alloy type.
• Rocatec shows particular promise for bonding to pure titanium in dental applications.