Department of Health Sciences III, Rey Juan Carlos University, Avda. de Atenas s/n, 28922 Alcorcón, Madrid, Spain.
J Esthet Restor Dent. 2011 Apr;23(2):116-24. doi: 10.1111/j.1708-8240.2011.00408.x.
To determine the influence of curing mode on the surface hardness of seven resin cements used to lute indirect composite restorations.
Seven commercial dual-curing resin cements were tested: two were total-etch (RelyX ARC [3M ESPE, St. Paul, MN, USA] and Variolink II [Ivoclar Vivadent, Schaan, Liechtenstein]); one was self-etch (Multilink Automix [Ivoclar Vivadent]), and four were self-adhesive (RelyX Unicem [3M ESPE], Maxcem Elite [Kerr Corp., Orange, CA, USA], SmartCem2 [Dentsply, Detrey, GmbH, Konstanz, Germany], and G-Cem [GC CORPORATION, Itabashi-Ku, Tokyo, Japan]). Three specimens (0.5 × 6.5mm) of each material were prepared for each of three experimental groups: Group 1 (cements allowed to self cure); Group 2 (cements light-cured for 40 seconds); and Group 3 (cements light-cured for 80 seconds). All specimens were cured through a 4-mm-thick composite cylinder (Filtek Z250-A3). Surface microhardness numbers were determined at 20 min after preparation. Results were analyzed by two-way analysis of variance and Student-Newman-Keuls tests (p<0.05).
Superficial hardness was significantly influenced by the resin cement tested (p<0.0001), the curing mode (p<0.0001), and their interaction (p<0.0001). RelyX ARC exhibited the highest mean microhardness values regardless of the curing mode. Light-curing significantly increased the microhardness of all resin cements studied, and these values increased even further with a doubling of irradiation time. Self-adhesive cements exhibited different behavior according to the curing mode. RelyX Unicem was highly sensitive to light irradiation, showing the lowest mean values in the self-curing mode. After light irradiation for 40 or 80 seconds, Maxcem Elite exhibited the lowest mean hardness values of all the resin cements tested.
The microhardness of resin cements is highly dependent on the brand. Dual-curing resin cements should always be light irradiated for longer periods than that recommended by manufacturers.
Dual-curing resin cements should always be light-cured for longer irradiation times, as light irradiation for 80 seconds yields the highest microhardness values in comparison with self-curing or light irradiation for 40 seconds. However, some self-adhesive resin cements exhibit low microhardness values when used to cement 4-mm-thick indirect composite restorations regardless of the curing mode applied.
研究不同固化模式对七种用于间接复合修复体黏结的树脂水门汀表面硬度的影响。
测试了七种商业双固化树脂水门汀：两种全酸蚀黏结剂（RelyX ARC [3M ESPE，明尼苏达州圣保罗，美国]和 Variolink II [义获嘉伟瓦登特，列支敦士登沙安]）；一种自酸蚀黏结剂（Multilink Automix [义获嘉伟瓦登特]），和四种自黏结剂（RelyX Unicem [3M ESPE]、Maxcem Elite [卡瓦科尔公司，加利福尼亚州橙市]、SmartCem2 [登士柏公司，康斯坦茨，德国]和 G-Cem [GC 株式会社，东京板桥区]）。每组材料制备三个试件（0.5×6.5mm），共三组：组 1（水门汀自固化）；组 2（水门汀光照 40 秒）；组 3（水门汀光照 80 秒）。所有试件均通过 4mm 厚的复合圆柱体（Filtek Z250-A3）进行固化。制备后 20 分钟测定表面显微硬度值。采用双因素方差分析和 Student-Newman-Keuls 检验进行结果分析（p<0.05）。
表面硬度显著受测试的树脂水门汀（p<0.0001）、固化模式（p<0.0001）及其相互作用（p<0.0001）的影响。无论固化模式如何，RelyX ARC 均表现出最高的平均显微硬度值。光照显著提高了所有研究的树脂水门汀的显微硬度，并且随着辐照时间的加倍，这些值进一步增加。自黏结水门汀的固化模式不同，行为也不同。RelyX Unicem 对光照非常敏感，在自固化模式下表现出最低的平均值。光照 40 秒或 80 秒后，Maxcem Elite 表现出所有测试的树脂水门汀中最低的平均硬度值。
树脂水门汀的显微硬度高度依赖于品牌。双固化树脂水门汀应始终按照制造商建议的时间进行长时间光照。
双固化树脂水门汀应始终进行长时间光照，与自固化或光照 40 秒相比，光照 80 秒可获得最高的显微硬度值。然而，一些自黏结树脂水门汀在用于黏结 4mm 厚的间接复合修复体时，无论应用何种固化模式，其显微硬度值均较低。
