2020 Volume 9 Issue 3 Pages 158-164
The purpose of this study was to conduct load-bearing tests on dual-structured CAD/CAM restoration with fiber-reinforced composite resin for posterior fixed partial dentures (FPDs), and to determine a suitable framework design for them.
Three-unit FPDs were fabricated on the metal model which simulated loss of right mandibular second premolar. The model was scanned with a laboratory scanner, and the FPDs were designed on the scanned data. FPDs were designed with common external form, and three types of frameworks with different connector thickness were designed; T15: 1.5 mm, T25: 2.5 mm, and T35: 3.5 mm. As a control group, the monolithic FPDs were fabricated by milling HC disk (HC-FPD). Dual-structured FPDs (DS-FPDs) were fabricated by bonding a milled TRINIA framework and a HC veneer. Maximum load to failure and first cracking load were measured with a universal testing machine.
In the DS-FPDs, the maximum load to failure and the first cracking load were higher than in the HC-FPDs. There were significant differences in the first cracking load between the HC-FPDs and the DS-FPDs (T25 and T35).
From our results, it was suggested that the DS-FPDs with over 2.5 mm connector thickness were more suitable for posterior FPDs in comparison with the HC-FPDs.
