SHEAR BOND STRENGTHS OF 10 ADHESIVE RESIN AMALGAM COMBINATIONS/

This study compared the shear bond strengths of amalgam to dentin usin g two amalgam alloys and five adhesive resin systems, One hundred extr acted human third molars were flattened occlusally to expose dentin, D entin surfaces were treated with one of five adhesive resins: All-Bond 2, Amalgambond Plus, Amalgambond Plus with HPA Powder, OptiBond, and Resinomer, Tytin (spherical) or Dispersalloy (admixed) amalgam was con densed onto the treated dentin surface through a Teflon split mold. Th e samples were stored 7-10 days and thermocycled before shear testing using a Zwick Materials Testing Machine, Two-way ANOVA revealed signif icant differences among the 10 groups (P < 0.05). The combination of T ytin/OptiBond produced the highest bond strength to dentin (14.17 MPa) , while Dispersalloy/Amalgambond Plus produced the lowest (3.89 MPa). In general, the filled resin systems (Amalgambond Plus with HPA Powder , OptiBond, Resinomer) produced higher bond strengths than the unfille d systems (All-Bond 2, Amalgambond Plus), Additionally, for four of th e five resins, bond strengths were higher with Tytin than with Dispers alloy, although differences were statistically significant in only two groups.