ArticleBMC oral health2026
Effect of different 10-Methacryloyloxydecyl Dihydrogen Phosphate concentrations on the shear bond strength between zirconia and composite resin.
Article in BMC oral health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundZirconia ceramics are widely used in restorative dentistry for their mechanical strength, but their lack of a glassy phase makes them resistant to conventional acid etching. While 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) is utilized to facilitate chemical bonding, the influence of monomer concentration on molecular coordination at the interface remains unclear. This study evaluated the effect of varying 10-MDP concentrations on shear bond strength (SBS) and investigated the underlying chemical bonding mechanisms.
methodsSpecimens were randomly divided into nine groups (n = 6): seven experimental groups treated with varying concentrations of experimental MDP solutions (2, 4, 6, 8, 10, 12, and 14% v/v in ethanol), a commercial MDP primer positive control (CMP; Z-Prime™ Plus), and a non-MDP primer-treated negative control (NMP). Zirconia surfaces were treated with these MDP solutions prior to bonding with flowable composite resin. Shear bond strength was measured using a universal testing machine. Chemical coordination modes were analyzed using
resultsShear bond strength was significantly influenced by MDP concentration, increasing from 2% (7.1 ± 0.4 MPa) to a peak at 10% (11.3 ± 0.8 MPa), followed by a significant decline at 12% (7.6 ± 0.7 MPa) and 14% (7.7 ± 0.8 MPa).
conclusionsBond strength is dictated by the distribution of MDP coordination modes rather than total presence. A 10% concentration is the ideal threshold for maximizing strong S2 ionic bonding. Exceeding this limit promotes non-productive phosphate multilayers that compromise interface stability.
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