Department of Conservative Dentistry and Endodontics, Saveetha Dental College, Saveetha University, Chennai, Tamil Nadu, India.
J Am Dent Assoc. 2012 Aug;143(8):e40-5. doi: 10.14219/jada.archive.2012.0302.
It is unknown if resin-based composite can be placed on top of mineral trioxide aggregate (MTA) immediately after placement of the MTA. The authors aimed to measure the bond strength of a resin-based composite to white MTA (WMTA) with different bonding strategies at different intervals.
The authors bonded resin-based composite to MTA with three bonding protocols (n = 45 per group) (group 1, total-etching adhesive; group 2, two-step self-etching adhesive; or group 3, one-step self-etching adhesive), immediately (subgroup A), 45 minutes (subgroup B) or 24 hours (subgroup C) after placement of the MTA. The authors measured shear bond strength by means of a universal testing machine and performed statistical analysis of the data by means of two-way and one-way analysis of variance (P < .05).
In all three groups, subgroup A demonstrated greater bond strengths than the other subgroups. Group/subgroup 3/A demonstrated the highest bond strength (mean [standard deviation] 49.2 [2.1] megapascals), which was significantly higher than that in all other groups (P < .05). This was followed by group/subgroup 1/A (40.2 [2.5] MPa), 2/A (38.4 [1.3] MPa) and 1/B (38.5 [1.91] MPa). The lowest bond strength was shown by group/subgroup 2/C (14.7 [1.90] MPa). There was a significant difference between the two-step and one-step self-etching adhesives at all three intervals (P < .05).
Within the limitations of this study, the representative one-step self-etching adhesive demonstrated the strongest bond to WMTA immediately after fabrication of MTA samples.
One-step self-etching adhesive may be used to bond resin-based composite to WMTA immediately after placement, thereby offsetting the need for a second appointment for permanent restoration.
目前尚不清楚在放置矿化三氧化物聚合体（MTA）后是否可以立即在其表面放置树脂基复合材料。作者旨在测量不同间隔时间下使用不同粘结策略时树脂基复合材料与白色 MTA（WMTA）的粘结强度。
作者使用三种粘结方案（每组 45 个试件）（第 1 组，全酸蚀粘结剂；第 2 组，两步自酸蚀粘结剂；或第 3 组，一步自酸蚀粘结剂）将树脂基复合材料粘结到 MTA 上（n = 45/组）（第 1 组，全酸蚀粘结剂；第 2 组，两步自酸蚀粘结剂；或第 3 组，一步自酸蚀粘结剂），分别在放置 MTA 后即刻（亚组 A）、45 分钟（亚组 B）或 24 小时（亚组 C）时进行粘结。作者使用万能试验机测量剪切粘结强度，并通过双因素和单因素方差分析（P <.05）对数据进行统计分析。
在所有三组中，亚组 A 的粘结强度均大于其他亚组。第 3 组/亚组 A 的粘结强度最高（平均值[标准差]为 49.2 [2.1]兆帕斯卡），明显高于其他所有组（P <.05）。其次是第 1 组/亚组 A（40.2 [2.5] MPa）、2 组/亚组 A（38.4 [1.3] MPa）和 1 组/亚组 B（38.5 [1.91] MPa）。第 2 组/亚组 C 的粘结强度最低（14.7 [1.90] MPa）。在所有三个间隔时间内，两步自酸蚀和一步自酸蚀粘结剂之间均存在显著差异（P <.05）。
在本研究的限制范围内，具有代表性的一步自酸蚀粘结剂在 MTA 样本制作后立即与 WMTA 具有最强的粘结强度。
一步自酸蚀粘结剂可用于在放置 MTA 后立即将树脂基复合材料粘结到 WMTA 上，从而无需第二次预约进行永久性修复。
