The Evaluation One Bottle Type Silane Coupling Agents.

Here is investigated the adhesiveness of one liquid type silane coupling agent. For the experiment, following materials are used: Cosmotech porcelain primer, Laminabond porcelain primer, Optec silane coupling agent, and Clearfil porcelain bond.The opal porcelain or the masking porcelain surface was polished with # 1000 paper and randomly classified as one of the following three conditions: 1) non etching, 2) phosphoric acid etching, 3) hydrofluoric acid etching. Then the porcelain surface was treated with each porcelain primer. The Laminabond composite paste was applied on the treated surface and cured by photo irradiation. The shear bond strengths between the composite and the porcelain were measured after one day immersion in 37°C water, or 10, 000 thermocycles between 4°C and 60.°CThere was no difference between the adhesion of composite to the opal porcelain and to the masking porcelain. The Laminabond porcelain primer and Optec silane coupling agent gave high bond strengths of 150-200 kgf/cm2on the non etching surface. Mechanical effects by the hydrofluoric acid etching did not contribute to the adhesion.The bond strengths after 10, 000 thermocycles remarkably decreased in all kinds of porcelain primer tested here.