Representative high magnification SEM micrograph of the post-composite interface after 1 month of aging in deionized water (2500×; bar=10 μm). Lack of bonding between the 4-META/γ-MPTS (Porcelain Liner M) treated post surface and the composite core is evident (arrow) along the entire circumference of the post. C: resin composite; F: quartz fibers within the fiber post. M: Epoxy resin matrix of fiber post.