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http://dx.doi.org/10.4047/jap.2017.9.5.328

Effect of ferrule on the fracture resistance of mandibular premolars with prefabricated posts and cores  

Kim, Ae-Ra (Department of Prosthodontics, School of Dentistry, Chonnam National University)
Lim, Hyun-Pil (Department of Prosthodontics, School of Dentistry, Chonnam National University)
Yang, Hong-So (Department of Prosthodontics, School of Dentistry, Chonnam National University)
Park, Sang-Won (Department of Prosthodontics, School of Dentistry, Chonnam National University)
Publication Information
The Journal of Advanced Prosthodontics / v.9, no.5, 2017 , pp. 328-334 More about this Journal
Abstract
PURPOSE. This study evaluated fracture resistance with regard to ferrule lengths and post reinforcement on endodontically treated mandibular premolars incorporating a prefabricated post and resin core. MATERIALS AND METHODS. One hundred extracted mandibular premolars were randomly divided into 5 groups (n=20): intact teeth (NR); endodontically treated teeth (ETT) without post (NP); ETT restored with a prefabricated post with ferrule lengths of either 0 mm (F0), 1 mm (F1), or 2 mm (F2). Prepared teeth were restored with metal crowns. A thermal cycling test was performed for 1,000 cycles. Loading was applied at an angle of 135 degrees to the axis of the tooth using a universal testing machine with a crosshead speed of 2.54 mm/min. Fracture loads were analyzed by one-way ANOVA and Tukey HSD test using a statistical program (${\alpha}=.05$). RESULTS. There were statistical differences in fracture loads among groups (P<.001). The fracture load of F2 ($237.7{\pm}83.4$) was significantly higher than those of NP ($155.6{\pm}74.3N$), F0 ($98.8{\pm}43.3N$), and F1 ($152.8{\pm}78.5N$) (P=.011, P<.001, and P=.008, respectively). CONCLUSION. Fracture resistance of ETT depends on the length of the ferrule, as shown by the significantly increased fracture resistance in the 2 mm ferrule group (F2) compared to the groups with shorter ferrule lengths (F0, F1) and without post (NP).
Keywords
Ferrule; Mandibular premolar; Fracture resistance; Post;
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