Influence of fabrication material and manufacturing technique on the internal adaptation of post-and-cores: A systematic review.

Statement Of Problem: Although various post-and-core systems have been proposed for restoring extensively damaged endodontically treated teeth, internal adaptation remains a clinical challenge leading to thick cement layers, which increase failure risk. Advances in digital workflows and novel materials offer alternatives; however, their clinical effectiveness regarding internal adaptation remains unclear.

Purpose: This systematic review aimed to evaluate the influence of fabrication material and manufacturing technique on the internal adaptation of post-and-cores.

Material And Methods: This review was registered at osf.io/6tcdu. Searches were conducted in 8 databases and non-peer-reviewed literature, with manual screening of references. Two independent reviewers selected studies based on predefined eligibility criteria.

Results: From 2232 records, 14 studies met the inclusion criteria, with an additional 5 identified through reference screening. Conventional casting showed good internal adaptation, while additive and subtractive manufacturing techniques offered specific advantages. Metal alloys were highly precise, and milled polyetheretherketone (PEEK) showed promise. Partial digital workflows may enhance accuracy, efficiency, and cost-effectiveness.

Conclusions: Conventional techniques yielded superior internal adaptation. However, digital and hybrid workflows enable the use of alternative materials with favorable internal adaptation, reduced debonding, and adequate mechanical properties, improving clinical predictability.