Long term bond strength achieved with the use of MDP in EasyGum Bond.

Role of MDP in EasyGum Bond

One of the key ingredients responsible for EasyGum Bond’s long-lasting and high bond strength is MDP (10-Methacryloyloxydecyl Dihydrogen Phosphate) — a well-established functional monomer widely used in self-etch and universal adhesive systems for its strong chemical bonding performance.

Key Functions and Advantages of MDP

• Strong Chemical Bonding to Hydroxyapatite
   MDP contains a phosphate group that forms stable ionic bond with calcium in hydroxyapatite, creating a durable hybrid layer with enhanced bond strength and resistance to degradation.
• Exceptional Versatility
   It bonds reliably to dentin, enamel, zirconia, metals, and selected ceramics, making it a cornerstone of modern universal adhesives and compatible with etch-and-rinse, self-etch, or selective-etch techniques.
• Hydrolytic Stability
   Compared to monomers such as HEMA or 4-META, MDP demonstrates greater resistance to hydrolysis, helping preserve long-term adhesion in the moist oral environment.
• Self-Etching Capability
   With a mildly acidic pH (~2), MDP can partially demineralize dentin while concurrently infiltrating it, allowing efficient simultaneous etching and bonding.

Common Applications

• Present in leading adhesive systems such as Clearfil SE Bond, Panavia, G-Premio Bond, and Scotchbond Universal.
• Widely used for zirconia priming (e.g., Z-Prime Plus) to improve bonding to high-strength ceramics

Evidence of Performance

• Numerous studies (e.g., in Dental Materials) report bond strengths exceeding 25 MPa to enamel and dentin, with minimal degradation over 5+ years of clinical observation.
• Our internal testing confirms ≥ 25 MPa bond strength to zirconia.
• Chemical analyses (XPS) have shown that MDP forms durable Zr–O–P bonds on zirconia surfaces, supporting its superior affinity for metal oxides.

Summary

MDP’s bifunctional structure—featuring a polymerizable methacrylate group and a phosphate group capable of strong ionic bonding—makes it one of the most effective and durable monomers in adhesive dentistry. Its ability to reduce microleakage, resist hydrolytic breakdown, and create stable long-term bonds is a major contributor to the strong clinical performance of EasyGum Bond.