Behr M, Rosentritt M, Sikora M I, Karl P, Handel G
Department of Prosthodontics, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany.
J Dent. 2003 Sep;31(7):503-8. doi: 10.1016/s0300-5712(03)00072-1.
This study compared the influence of different inner crown surfaces on the fracture resistance and marginal adaptation of adhesively fixed glass fibre-reinforced molar crowns.
Vectris/Targis crowns were constructed with an inner framework of glass fibres (directly on the tooth) or an inner veneering composite layer between the fibre-framework and the tooth-substance. Both groups were sandblasted inside using Al(2)O(3); 50 microm grain size (200 kPa, 20 s) and silane coated. A control group had the inner fibre framework, but was neither sandblasted nor silane coated. The crowns were adhesively cemented on extracted human teeth, and thermally cycled and mechanically loaded (TCML: 6000 x 5 degrees C/55 degrees C; 1.2 x 10(6) x 50 N, 1.66 Hz). The marginal adaptation before and after TCML was evaluated and the fracture resistance was investigated using a Zwick universal testing machine.
After TCML the proportion of 'perfect margin' of the control group decreased significantly at the interface crown/cement. For the variations with an inner fibre framework or inner composite layer the marginal adaptation or fracture resistance did not decrease significantly after ageing. The fracture resistance values were control: 1509N+/-486; inner fibre framework: 1896N+/-342; inner composite layer: 1754N+/-340.
In the case of the investigated fibre framework and veneering composite, the inner surface of glass fibre-reinforced molar crowns can be covered with a composite layer or with a glass fibre framework. Both methods achieve comparable high fracture strengths and reliable marginal adaptation.
本研究比较了不同内冠表面对粘结固定玻璃纤维增强磨牙冠抗折性和边缘适应性的影响。
Vectris/Targis冠采用玻璃纤维内框架（直接置于牙齿上）或纤维框架与牙体组织之间的内贴面复合层构建。两组均在内部使用粒度为50微米的Al(2)O(3)进行喷砂处理（200 kPa，20秒）并进行硅烷涂层处理。对照组有内纤维框架，但未进行喷砂处理和硅烷涂层处理。将冠粘结在拔除的人牙上，进行热循环和机械加载（热循环和机械加载：6000次5℃/55℃循环；1.2×10(6)次50 N，1.66 Hz）。评估热循环和机械加载前后的边缘适应性，并使用Zwick万能试验机研究抗折性。
热循环和机械加载后，对照组在冠/粘结剂界面处“完美边缘”的比例显著下降。对于有内纤维框架或内复合层的变体，老化后边缘适应性或抗折性没有显著下降。抗折性数值为：对照组1509N±486；内纤维框架组1896N±342；内复合层组1754N±340。
在所研究的纤维框架和贴面复合材料的情况下，玻璃纤维增强磨牙冠的内表面可以用复合层或玻璃纤维框架覆盖。两种方法都能达到相当高的抗折强度和可靠的边缘适应性。
