Department of Prosthetic Dentistry, Center of Dentistry, Ulm Department of Dental Prosthodontics and Material Science, University of Leipzig, Leipzig, Germany.
Int Endod J. 2011 Mar;44(3):195-202. doi: 10.1111/j.1365-2591.2010.01797.x. Epub 2010 Oct 7.
To investigate the load capability of root filled teeth restored with glass fibre posts when the same self-adhesive composite resin cement was used as post cement and core build-up material.
Human maxillary central incisors were divided into four groups (n=10). Teeth were root filled, decoronated and restored using glass fibre posts luted with different cements and composite resins for core build-up (i) RelyX Unicem/Clearfil Core (RXU/CC), (ii) RelyX Unicem/ RelyX Unicem (RXU/RXU), (iii) RelyX Unicem/LuxaCore-Dual (RXU/LCD) and (iv) LuxaCore-Dual/Clearfil (LCD/CC). A 2-mm ferrule crown preparation was always performed. All specimens were restored with adhesively luted all-ceramic crowns and were exposed to thermal cycling and mechanical loading (TCML) and subsequently statically loaded. For analysis of cycles-to-failure during TCML, log-rank statistics were calculated. The nonparametric Kruskal-Wallis test was applied to study group mean differences. Differences in the frequency of the failure modes between the groups were evaluated by Fisher's exact test. All tests were two-sided (α=0.05).
Three specimens of RXU/LCD and two of RXU/RXU and LCD/CC, respectively, failed during TCML (P=0.379). For these specimens, the load capability value was set at 0 N. The median fracture load values (min/max) in (N) were RXU/CC=294 (209/445), RXU/RXU = 166 (0/726), RXU/LCD=241 (0/289) and LCD/CC=200 (0/371) (P=0.091). The RXU/CC had the highest (80%) and RXU/LCD the lowest (20%) percentage of restorable failures (P=0.028).
These results imply that self-adhesive composite achieved similar load capabilities when used as core build-up materials in root filled teeth restored with glass fibre posts and all-ceramic crowns.
研究在使用相同的自黏复合树脂黏固剂作为黏固剂和核材料时，玻璃纤维桩修复的根管内牙的负载能力。
将人类上颌中切牙分为四组（n=10）。牙体根管填充、去冠并使用不同黏固剂和复合树脂进行玻璃纤维桩核修复（i）RelyX Unicem/Clearfil Core（RXU/CC）、（ii）RelyX Unicem/RelyX Unicem（RXU/RXU）、（iii）RelyX Unicem/LuxaCore-Dual（RXU/LCD）和（iv）LuxaCore-Dual/Clearfil（LCD/CC）。始终进行 2-mm 冠套制备。所有标本均用黏接全瓷冠修复，并进行热循环和机械加载（TCML）和随后的静态加载。为了分析 TCML 过程中的循环失效次数，计算了对数秩统计。应用非参数 Kruskal-Wallis 检验研究组间均值差异。通过 Fisher 确切检验评估组间失效模式的频率差异。所有检验均为双侧（α=0.05）。
RXU/LCD 组有 3 个标本和 RXU/RXU 组和 LCD/CC 组各有 2 个标本在 TCML 过程中失效（P=0.379）。对于这些标本，将负载能力值设置为 0N。（N）中中位数骨折载荷值（最小值/最大值）分别为 RXU/CC=294（209/445）、RXU/RXU=166（0/726）、RXU/LCD=241（0/289）和 LCD/CC=200（0/371）（P=0.091）。RXU/CC 的可修复失败率最高（80%），而 RXU/LCD 的可修复失败率最低（20%）（P=0.028）。
这些结果表明，自黏复合树脂在玻璃纤维桩修复的根管内牙和全瓷冠中用作核材料时，具有相似的负载能力。
