Okuda Makoto, Nikaido Toru, Maruoka Rena, Foxton Richard M, Tagami Junji
Department of Restorative Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
J Esthet Restor Dent. 2007;19(1):38-46; discussion 47-8. doi: 10.1111/j.1708-8240.2006.00062.x.
The aims of this study were (1) to evaluate the effect of a resin coating on the microtensile bond strengths (mu-TBSs) of indirect composite restorations bonded to dentin with resin cement and (2) to compare the mu-TBSs with that of a directly placed composite.
Class I cavities were prepared in extracted human molars. The specimens were divided into five groups: For the indirect restorations, the cavity surfaces of the control group were left uncoated (group 1), while the surfaces of the experimental groups were resin coated with a dentin bonding system, Clearfil Protect Bond (PB; groups 2 and 3), or with a combination of PB and a flowable resin composite, Protect Liner F (PLF; group 4). The cavities were temporized for 1 day. Indirect composite restorations (Estenia) were cemented with a resin cement (Panavia F). Pretreatment with ED Primer II was performed in the groups 1, 3, and 4. For the direct restorations, the cavities were restored with PB and a direct composite (Clearfil AP-X; group 5). After 24 hours of water storage, mu-TBSs were measured at a crosshead speed of 1 mm/min. The data were analyzed with one-way analysis of variance and Sheffe's test (p < 0.05). In addition, fracture modes were determined visually and by scanning electron microscopy.
A combination of PB and PLF showed significantly higher bond strengths compared with the original bond strength of Panavia F and the single use of PB (p < 0.05). However, the highest bond strengths were obtained when PB was used for direct composite restorations (p < 0.05).
The application of a resin coating consisting of a self-etching primer dentin bonding system and a flowable resin composite significantly improved the mu-TBS of indirect restorations bonded to dentin using resin cement.
A resin coating should be required to improve dentin bonding performance of Panavia F in indirect restorations. However, direct composite restorations still provide higher bond strength compared to indirect restorations.
本研究的目的是（1）评估树脂涂层对用树脂水门汀粘结到牙本质的间接复合树脂修复体微拉伸粘结强度（μ-TBS）的影响，以及（2）将μ-TBS与直接放置的复合树脂的μ-TBS进行比较。
在拔除的人类磨牙上制备I类洞。将标本分为五组：对于间接修复体，对照组的洞表面不涂层（第1组），而实验组的表面用牙本质粘结系统Clearfil Protect Bond（PB；第2组和第3组）或PB与可流动树脂复合材料Protect Liner F（PLF；第4组）的组合进行树脂涂层。洞临时封闭1天。间接复合树脂修复体（Estenia）用树脂水门汀（Panavia F）粘结。第1、3和4组进行ED Primer II预处理。对于直接修复体，用PB和直接复合树脂（Clearfil AP-X；第5组）修复洞。在水储存24小时后，以1mm/min的十字头速度测量μ-TBS。数据用单因素方差分析和谢弗检验进行分析（p<0.05）。此外，通过肉眼和扫描电子显微镜确定断裂模式。
与Panavia F的原始粘结强度和单独使用PB相比，PB和PLF的组合显示出显著更高的粘结强度（p<0.05）。然而，当PB用于直接复合树脂修复体时获得了最高的粘结强度（p<0.05）。
由自酸蚀底漆牙本质粘结系统和可流动树脂复合材料组成的树脂涂层的应用显著提高了使用树脂水门汀粘结到牙本质的间接修复体的μ-TBS。
在间接修复体中，应需要树脂涂层来改善Panavia F的牙本质粘结性能。然而，与间接修复体相比，直接复合树脂修复体仍提供更高的粘结强度。
