Abstract
The prevention of root fractures of pulpless teeth is an important clinical issue to maintain healthy teeth through lifetime. The aim of this study was to examine a clinically effective treatment method for strengthening vulnerable pulpless teeth using CAD/CAM (computer-aided design/computer-aided manufacturing) fiber-reinforced post-core by conducting a fracture resistance test. A post-core made with a fiber-reinforced resin disk TRINIA (TR, SHOFU, Kyoto, Japan) was fabricated using a CAD/CAM system. The fiber-layer orientation of the CAD/CAM post-core was parallel to the axis of the restored tooth. A post-core using a conventional composite and a fiber post (CF) was also prepared. A fracture resistance test of teeth restored with the post-cores and zirconia crowns was conducted using a universal testing machine, and fracture patterns were identified by micro-CT observation. The fracture load of the roots restored with TR was 1555.9 ± 231.8 N, whereas that of CF was 1082.1 ± 226.7 N. The fracture load of TR was 43.8% that was significantly higher than that of CF (Student’s t-test, p < 0.05). The restored teeth with CAD/CAM resin post-core were found to be repairable even after fracture. These results suggest that the CAD/CAM indirect fiber post-core has the potential to strengthen the vulnerable pulpless teeth.
Highlights
Root fractures of pulpless teeth are one of the most common causes of teeth loss in patients, who receive regular preventative care for caries and periodontitis [1]
Indirect post-cores with fiber posts and resin cores are recommended for restoring vulnerable pulpless teeth [2,3,4], since using materials with a modulus of elasticity like dentin is important for preventing root fractures [5]
We focused on the fiberglass-reinforced resin disk TRINIA (SHOFU), consisting of 55 wt.% fiberglass woven into a mesh and layered structure, with an epoxy resin matrix
Summary
Root fractures of pulpless teeth are one of the most common causes of teeth loss in patients, who receive regular preventative care for caries and periodontitis [1]. The prevention of root fractures of pulpless teeth is an important clinical issue to maintain healthy teeth through lifetime. We often encounter pulpless teeth with extremely limited remaining tooth structure, owing to the repeated restorative treatments undergone. Reinforcement of the remaining tooth with reliable adhesive materials can be an effective measure to preserve such teeth by preventing root fracture. Indirect post-cores with fiber posts and resin cores are recommended for restoring vulnerable pulpless teeth [2,3,4], since using materials with a modulus of elasticity like dentin is important for preventing root fractures [5]. We used TRINIA as CAD/CAM post-cores with an aim to maximize the effect of reinforcement of pulpless teeth with fiber materials by adhering uniformly distributed fiber materials to root dentin
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