Evaluation of the fit of zirconia three-unit fixed partial dentures fabricated by different impression techniques.

Aim: The aim of the present study was to evaluate the marginal and internal fit of zirconium fixed partial denture using different impression techniques.

Methods: A Nissin Typodont model, including maxillary central incisor and canine with missing lateral incisor, was selected for the present study. Thirty zirconium frameworks were fabricated following three impression techniques (N = 10), conventional silicone impression (group C), scanned dental impression (group S), and Trios 3 (3Shape) intraoral scanner (group T).

Marginal and internal fit of CAD/CAM fiber post and cores.

Aim: To evaluate the marginal adaptation and internal fit of milled fiber post and cores using different scanning methods.

Materials And Methods: Thirty typodont tooth models (Nissin) with pulp cavity were endodontically treated and prepared to receive 30 fabricated fiber post and cores. Three different methods of scanning were used (n = 10): an intraoral scanner (IOS) (Trios 3; 3Shape) to directly digitalize the post space (Group T) and a laboratory scanner to indirectly digitalize the resin pattern (Group RP) and the silicone impression (Group S) of the post space.