Light-cured resin for post patterns

Multi-Piece Post-Crown for Multi-Rooted Teeth with Non-Parallel Canals: A Direct Pattern Technique

“…The core section is modified by removing any undercut adjacent to the other post-holes and to make dovetails grooves and lubricate it with petroleum jelly. Keep this post with its section of the core in place inside the tooth and build up the other post or posts with their corresponding section of the core, following steps 3 through 5 for the other canal or canals using either hard inlay pattern wax 15 (Keystone, USA), cold-cure resin (Durallay) (Figure 3 and 4), light-cured rein, 16 or thermoplastic resin. 17 f. Invest post-core patterns ( Figure 5) and cast those following standard techniques (no asbestos substitute liner).…”

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“…The standard technique incorporates a standardized plastic post that is fitted in the prepared canal, and then self-cured acrylic resin is used to provide an accurate fit of the post in the canal, forming the post portion of the pattern. Recently the fabrication of a post and core using a combination of light-and chemically activated resins was reported (Waldmeier & Grasso, 1992). These resins were only used for the core portions, because the depth of polymerization of light-activated systems could not exceed 3 mm, which prohibited the use of light-activated resins for the post portion.…”