The effect of flexural load cycling on the microleakage of cervical resin composites.
The effect of flexural load cycling on the microleakage of cervical resin composites.
复制标题
弯曲载荷循环对颈部树脂复合材料微渗漏的影响。
作者：
S. Kubo;H. Yokota;Y. Sata;Y. Hayashi
尽管一些体外研究试图研究载荷下V类树脂复合材料的微渗漏，但载荷循环对边缘密封的影响仍不清楚。这可能是由于对样本施加了轴向载荷。本研究探讨了弯曲载荷对宫颈树脂复合材料边缘封闭性的影响。根据制造商的说明，使用Clearfil Photo Bond、Clearfil Liner Bond 2、含有10%马来酸的Scotchbond Multi-Purpose、含有35%磷酸的Scotchbond Multi-Purpose或Mac-Bond 2修复150个颈椎楔形洞。冲洗完成后，每组10个标本浸泡在0.5%碱性品红溶液中检测微渗漏。在染料溶液浸泡之前，对20个样本进行弯曲载荷循环（在切缘处唇-舌或舌-唇位移1 mm，10，000次循环，1次循环/秒）。使用Kruskal-Wallis检验和Mann-Whitney U检验分析数据（p<0.05）。当不施加弯曲载荷时，无论使用何种粘合剂系统，切缘和根尖缘均显示出良好的边缘密封。唇舌负荷显着恶化的边缘完整性在切牙釉质边缘，除了那些恢复与Clearfil照片债券。然而，只有Clearfil Photo Bond显示沿根尖牙本质边缘的微渗漏沿着显著增加。舌唇加载对边缘密封没有显著影响。
Although several in vitro studies have attempted to investigate the microleakage of Class V resin composites under loading, the effect of load cycling on marginal seal is still unclear. This may be due to the fact that axial loads were applied to the specimens. This study investigated the effect of flexural loads on marginal sealing of cervical resin composites. One hundred and fifty cervical wedge-shaped cavities were restored with Clearfil Photo Bond, Clearfil Liner Bond 2, Scotchbond Multi-Purpose with 10% maleic acid, Scotchbond Multi-Purpose with 35% phosphoric acid or Mac-Bond 2 according to the manufacturers' instructions. After the restorations were finished, 10 specimens from each group were immersed in 0.5% basic fuchsin solution to examine microleakage. Prior to dye solution immersion, 20 specimens were subjected to flexural load cycling (1 mm labio-lingual or linguo-labial displacement at the incisal edge, 10,000 cycles, 1 cycle/second). The data were analyzed using the Kruskal-Wallis test and the Mann-Whitney U-test (p<0.05). When the flexural loads were not applied, both the incisal and apical margins showed good marginal sealing, regardless of the adhesive system used. Labio-lingual loading significantly deteriorated the marginal integrity at the incisal enamel margins, except for those restored with Clearfil Photo Bond. However, only Clearfil Photo Bond demonstrated a significant increase in microleakage along the apical dentin margins. Linguo-labial loading had no significant effect on the marginal seal.