A dental-materials experiment compares 10-MDP at 2-14% with commercial and non-MDP controls on zirconia. Shear bond strength peaked at 10% and declined at higher concentrations, with NMR linking performance to bidentate ionic-complex distribution.
Key findings
- SBS rose from 7.1±0.4 MPa at 2% to 11.3±0.8 MPa at 10%, then fell to 7.6±0.7 and 7.7±0.8 MPa at 12% and 14%. Ten percent had the largest S2 bidentate complex fraction, while higher levels produced more S3 bridging and S4/S5 oligomers.
Why this matters globally
Mechanistic coordination evidence can guide primer design beyond formulation screening and may improve zirconia restoration durability if the relationship survives aging.
Thai researcher contribution
Naresuan and Chulalongkorn researchers linked restorative dentistry, prosthodontics, and spectroscopy to explain bond strength and molecular mechanism.
Limitations to consider
Six specimens per group provide limited precision; shear tests concentrate stress and do not mimic clinical failure. Aging, thermocycling, saliva, contamination, and other zirconias are not reported, so the 'ideal' threshold is condition-specific.