Fracture resistance and failure mode of endodontically treated teeth restored using ceramic onlays with or without fiber posts-an ex vivo study

• Published in: Dental traumatology Vol. 32; no. 4; pp. 328 - 335
• Main Authors: Keçeci, Ayşe Diljin, Heidemann, Detlef, Kurnaz, Safa
• Format: Journal Article
• Language: English
• Published: Denmark Blackwell Publishing Ltd 01-08-2016
• Subjects: ceramic onlays; Ceramics; Composite Resins; Dental Stress Analysis; Dentistry; fiber posts; fracture strength; glass fiber; Humans; Inlays; IPS Empress 2; Post and Core Technique; quartz fiber; Tooth Fractures; Tooth, Nonvital; fracture strength; quartz fiber; fiber posts; glass fiber; ceramic onlays; IPS Empress 2
• ISSN: 1600-4469; 1600-9657
• DOI: 10.1111/edt.12252

Aim
This study aimed to compare the fracture resistance and fracture modes of ceramic onlay restorations with or without fiber posts in endodontically treated premolars.
Material and methods
Fifty extracted human premolars with similar anatomic features were used in this study. Four groups (n = 10) were treated endodontically. Onlay cavities extended to the buccal and palatal cusps and reached out the endodontic accesses were prepared. Ceramic onlay restorations with or without fiber posts were categorized as Group CO (ceramic onlays without posts), Group COQF (ceramic onlays and quartz fiber posts), and Group COGF (ceramic onlays and glass fiber posts). Positive control group was left as non‐restored (Group NR). Ten intact teeth were stored as negative control group (Group IT). Fracture resistance was measured using a universal load‐testing machine applying compressive load at a crosshead speed of 1 mm min−1 until fracture. Fracture resistance and modes were evaluated statistically.
Results
Ceramic onlay restorations (Groups CO, COQF, COGF) increased the fracture resistance significantly, when compared with non‐restored teeth (P < 0.05). However, no significant differences were found in the groups with fiber posts in terms of fracture resistance (P > 0.05). Negative control group (IT) had significantly higher fracture resistance than all others (P < 0.05). Fracture types had significant differences among the groups (P < 0.01).
Conclusions
Within the limitations of this ex‐vivo study, partial coverage with ceramic onlays resulted in a significant improvement of the fracture resistance of endodontically treated premolars. However, insertion of glass or quartz fibers did not increase the fracture resistance significantly.