Keçeci Ayşe Diljin, Heidemann Detlef, Kurnaz Safa
Department of Endodontics, School of Dentistry, Suleyman Demirel University, Isparta, Turkey.
J.W. Goethe University of Frankfurt (Carolinum), Frankfurt, Germany.
Dent Traumatol. 2016 Aug;32(4):328-35. doi: 10.1111/edt.12252. Epub 2015 Dec 28.
This study aimed to compare the fracture resistance and fracture modes of ceramic onlay restorations with or without fiber posts in endodontically treated premolars.
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.
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).
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.
本研究旨在比较在根管治疗后的前磨牙中，有或没有纤维桩的陶瓷高嵌体修复体的抗折性及折裂模式。
本研究使用了50颗具有相似解剖特征的拔除的人类前磨牙。四组（每组n = 10）进行根管治疗。制备延伸至颊尖和腭尖并到达根管入口的高嵌体窝洞。有或没有纤维桩的陶瓷高嵌体修复体分为CO组（无桩陶瓷高嵌体）、COQF组（陶瓷高嵌体和石英纤维桩）和COGF组（陶瓷高嵌体和玻璃纤维桩）。阳性对照组为未修复（NR组）。将10颗完整牙齿作为阴性对照组（IT组）。使用万能负载试验机以1 mm/min(-1)的十字头速度施加压缩载荷直至折裂，测量抗折性。对抗折性和折裂模式进行统计学评估。
与未修复的牙齿相比，陶瓷高嵌体修复体（CO组、COQF组、COGF组）显著提高了抗折性（P < 0.05）。然而，在有纤维桩的组之间，抗折性方面未发现显著差异（P > 0.05）。阴性对照组（IT组）的抗折性显著高于所有其他组（P < 0.05）。各组之间的折裂类型有显著差异（P < 0.01）。
在本体外研究的局限性内，陶瓷高嵌体部分覆盖可显著提高根管治疗后前磨牙的抗折性。然而，插入玻璃或石英纤维并未显著提高抗折性。
