Quick answer
Choose the UniCore post size that matches your prepared canal's final drill diameter, and always confirm fit with a trial seat before cementation. The system's glass fiber composition is designed to respond to compression forces like dentin, which can help reduce the risk of root fracture compared with metal posts.
Why post diameter matters more than post type
Post diameter directly affects how much dentin remains after preparation. A post that is too wide removes unnecessary tooth structure and can weaken the root, while an undersized post may not provide adequate retention. The UniCore system pairs each post with a matching drill, so selecting the correct drill size is the first step in preserving dentin.
Fiber posts like UniCore are generally more conservative because they can be bonded and their stiffness is closer to dentin. Metal posts, while strong, are stiffer and can concentrate stress at the post-dentin interface. The trade-off is that fiber posts require careful adhesive cementation to perform well.
When to consider a metal post instead
Metal posts may still be appropriate in cases with very limited coronal tooth structure or when a cast post-and-core is planned. However, they are not the default choice for most routine cases. The UniCore system is designed for situations where a conservative, bondable fiber post is indicated, and its glass fiber composition responds to compression forces similarly to dentin.
UniCore post selection and cementation FAQ
How do I choose the right UniCore post size?
After preparing the canal, use the corresponding UniCore drill to create a post space that matches the post size. Trial-fit the post; it should seat fully without forcing. If the post does not seat, refine the canal with the drill rather than forcing the post. Always trial-seat the post before cementation to confirm fit.
What is the difference between fiber and metal posts for post selection?
Fiber posts like UniCore are bonded and have a modulus of elasticity closer to dentin, which distributes stress more evenly. Metal posts are stiffer and rely more on mechanical retention. Choose fiber posts for conservative, adhesive cases; consider metal posts only when fiber posts are not indicated. Fiber posts are not universal; assess remaining dentin and bonding conditions.
How should I prepare the post space for cementation?
Clean the canal with irrigants, dry it, and follow the adhesive system's instructions. For UniCore posts, use a resin cement and ensure the post is clean and dry before cementation. Avoid contaminating the post surface. Cementation success depends on clean, dry post space and proper adhesive protocol.
Can I adjust the post length after cementation?
No. The post should be adjusted and fitted before cementation. Cutting a fiber post after cementation can expose fibers and compromise the restoration. Finalize post length and fit before applying cement.
What if the post feels tight during trial fit?
Do not force the post. Re-insert the matching drill to remove any obstructions or irregularities, then trial-fit again. A properly fitting post should slide into place with light pressure and stay seated. Resistance during trial fit indicates the need for further preparation, not force.
Product facts
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UniCore™-Post and Drill System: UniCore posts are composed of glass fibers and respond to compression forces as dentin would. This means the post is designed to flex and absorb load in a way that is more compatible with the root, which can reduce the risk of catastrophic failure compared with stiffer metal posts.
UniCore™-Post and Drill System